[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // |
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| 28 | // Hadronic Process: Reaction Dynamics |
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| 29 | // original by H.P. Wellisch |
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| 30 | // modified by J.L. Chuma, TRIUMF, 19-Nov-1996 |
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| 31 | // Last modified: 27-Mar-1997 |
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| 32 | // modified by H.P. Wellisch, 24-Apr-97 |
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| 33 | // H.P. Wellisch, 25.Apr-97: Side of current and target particle taken into account |
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| 34 | // H.P. Wellisch, 29.Apr-97: Bug fix in NuclearReaction. (pseudo1 was without energy) |
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| 35 | // J.L. Chuma, 30-Apr-97: Changed return value for GenerateXandPt. It seems possible |
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| 36 | // that GenerateXandPt could eliminate some secondaries, but |
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| 37 | // still finish its calculations, thus we would not want to |
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| 38 | // then use TwoCluster to again calculate the momenta if vecLen |
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| 39 | // was less than 6. |
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| 40 | // J.L. Chuma, 10-Jun-97: Modified NuclearReaction. Was not creating ReactionProduct's |
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| 41 | // with the new operator, thus they would be meaningless when |
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| 42 | // going out of scope. |
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| 43 | // J.L. Chuma, 20-Jun-97: Modified GenerateXandPt and TwoCluster to fix units problems |
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| 44 | // J.L. Chuma, 23-Jun-97: Modified ProduceStrangeParticlePairs to fix units problems |
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| 45 | // J.L. Chuma, 26-Jun-97: Modified ProduceStrangeParticlePairs to fix array indices |
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| 46 | // which were sometimes going out of bounds |
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| 47 | // J.L. Chuma, 04-Jul-97: Many minor modifications to GenerateXandPt and TwoCluster |
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| 48 | // J.L. Chuma, 06-Aug-97: Added original incident particle, before Fermi motion and |
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| 49 | // evaporation effects are included, needed for self absorption |
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| 50 | // and corrections for single particle spectra (shower particles) |
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| 51 | // logging stopped 1997 |
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| 52 | // J. Allison, 17-Jun-99: Replaced a min function to get correct behaviour on DEC. |
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| 53 | |
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| 54 | #include "G4ReactionDynamics.hh" |
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| 55 | #include "G4AntiProton.hh" |
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| 56 | #include "G4AntiNeutron.hh" |
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| 57 | #include "Randomize.hh" |
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| 58 | #include <iostream> |
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| 59 | #include "G4HadReentrentException.hh" |
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| 60 | #include <signal.h> |
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| 61 | |
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| 62 | // #include "DumpFrame.hh" |
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| 63 | |
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| 64 | /* G4double GetQValue(G4ReactionProduct * aSec) |
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| 65 | { |
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| 66 | double QValue=0; |
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| 67 | if(aSec->GetDefinition()->GetParticleType() == "baryon") |
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| 68 | { |
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| 69 | if(aSec->GetDefinition()->GetBaryonNumber() < 0) |
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| 70 | { |
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| 71 | QValue = aSec->GetTotalEnergy(); |
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| 72 | QValue += G4Neutron::Neutron()->GetPDGMass(); |
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| 73 | } |
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| 74 | else |
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| 75 | { |
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| 76 | G4double ss = 0; |
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| 77 | ss +=aSec->GetDefinition()->GetPDGMass(); |
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| 78 | if(aSec->GetDefinition() == G4Proton::Proton()) |
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| 79 | { |
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| 80 | ss -=G4Proton::Proton()->GetPDGMass(); |
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| 81 | } |
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| 82 | else |
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| 83 | { |
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| 84 | ss -=G4Neutron::Neutron()->GetPDGMass(); |
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| 85 | } |
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| 86 | ss += aSec->GetKineticEnergy(); |
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| 87 | QValue = ss; |
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| 88 | } |
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| 89 | } |
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| 90 | else if(aSec->GetDefinition()->GetPDGEncoding() == 0) |
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| 91 | { |
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| 92 | QValue = aSec->GetKineticEnergy(); |
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| 93 | } |
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| 94 | else |
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| 95 | { |
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| 96 | QValue = aSec->GetTotalEnergy(); |
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| 97 | } |
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| 98 | return QValue; |
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| 99 | } |
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| 100 | */ |
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| 101 | |
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| 102 | G4bool G4ReactionDynamics::GenerateXandPt( |
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| 103 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
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| 104 | G4int &vecLen, |
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| 105 | G4ReactionProduct &modifiedOriginal, // Fermi motion & evap. effects included |
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| 106 | const G4HadProjectile *originalIncident, // the original incident particle |
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| 107 | G4ReactionProduct ¤tParticle, |
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| 108 | G4ReactionProduct &targetParticle, |
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| 109 | const G4DynamicParticle* originalTarget, |
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| 110 | const G4Nucleus &targetNucleus, |
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| 111 | G4bool &incidentHasChanged, |
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| 112 | G4bool &targetHasChanged, |
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| 113 | G4bool leadFlag, |
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| 114 | G4ReactionProduct &leadingStrangeParticle ) |
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| 115 | { |
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| 116 | // |
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| 117 | // derived from original FORTRAN code GENXPT by H. Fesefeldt (11-Oct-1987) |
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| 118 | // |
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| 119 | // Generation of X- and PT- values for incident, target, and all secondary particles |
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| 120 | // A simple single variable description E D3S/DP3= F(Q) with |
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| 121 | // Q^2 = (M*X)^2 + PT^2 is used. Final state kinematic is produced |
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| 122 | // by an FF-type iterative cascade method |
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| 123 | // |
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| 124 | // internal units are GeV |
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| 125 | // |
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| 126 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 127 | |
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| 128 | // Protection in case no secondary has been created; cascades down to two-body. |
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| 129 | if(vecLen == 0) return false; |
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| 130 | |
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| 131 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
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| 132 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
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| 133 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
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| 134 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
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| 135 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
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| 136 | |
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| 137 | G4int i, l; |
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| 138 | G4bool veryForward = false; |
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| 139 | |
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| 140 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/GeV; |
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| 141 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
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| 142 | const G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
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| 143 | const G4double pOriginal = modifiedOriginal.GetMomentum().mag()/GeV; |
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| 144 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
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| 145 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
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| 146 | targetMass*targetMass + |
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| 147 | 2.0*targetMass*etOriginal ); // GeV |
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| 148 | G4double currentMass = currentParticle.GetMass()/GeV; |
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| 149 | targetMass = targetParticle.GetMass()/GeV; |
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| 150 | // |
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| 151 | // randomize the order of the secondary particles |
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| 152 | // note that the current and target particles are not affected |
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| 153 | // |
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| 154 | for( i=0; i<vecLen; ++i ) |
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| 155 | { |
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| 156 | G4int itemp = G4int( G4UniformRand()*vecLen ); |
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| 157 | G4ReactionProduct pTemp = *vec[itemp]; |
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| 158 | *vec[itemp] = *vec[i]; |
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| 159 | *vec[i] = pTemp; |
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| 160 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 161 | } |
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| 162 | |
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| 163 | if( currentMass == 0.0 && targetMass == 0.0 ) |
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| 164 | { |
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| 165 | // Target and projectile have annihilated. Replace them with the first |
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| 166 | // two secondaries in the list. Current particle KE is maintained. |
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| 167 | |
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| 168 | G4double ek = currentParticle.GetKineticEnergy(); |
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| 169 | G4ThreeVector m = currentParticle.GetMomentum(); |
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| 170 | currentParticle = *vec[0]; |
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| 171 | targetParticle = *vec[1]; |
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| 172 | for( i=0; i<(vecLen-2); ++i )*vec[i] = *vec[i+2]; |
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| 173 | G4ReactionProduct *temp = vec[vecLen-1]; |
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| 174 | delete temp; |
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| 175 | temp = vec[vecLen-2]; |
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| 176 | delete temp; |
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| 177 | vecLen -= 2; |
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| 178 | currentMass = currentParticle.GetMass()/GeV; |
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| 179 | targetMass = targetParticle.GetMass()/GeV; |
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| 180 | incidentHasChanged = true; |
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| 181 | targetHasChanged = true; |
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| 182 | currentParticle.SetKineticEnergy( ek ); |
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| 183 | currentParticle.SetMomentum( m ); |
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| 184 | veryForward = true; |
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| 185 | } |
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| 186 | const G4double atomicWeight = targetNucleus.GetN(); |
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| 187 | const G4double atomicNumber = targetNucleus.GetZ(); |
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| 188 | const G4double protonMass = aProton->GetPDGMass()/MeV; |
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| 189 | |
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| 190 | if (originalIncident->GetDefinition()->GetParticleSubType() == "kaon" |
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| 191 | && G4UniformRand() >= 0.7) { |
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| 192 | G4ReactionProduct temp = currentParticle; |
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| 193 | currentParticle = targetParticle; |
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| 194 | targetParticle = temp; |
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| 195 | incidentHasChanged = true; |
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| 196 | targetHasChanged = true; |
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| 197 | currentMass = currentParticle.GetMass()/GeV; |
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| 198 | targetMass = targetParticle.GetMass()/GeV; |
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| 199 | } |
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| 200 | const G4double afc = std::min( 0.75, |
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| 201 | 0.312+0.200*std::log(std::log(centerofmassEnergy*centerofmassEnergy))+ |
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| 202 | std::pow(centerofmassEnergy*centerofmassEnergy,1.5)/6000.0 ); |
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| 203 | |
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| 204 | G4double freeEnergy = centerofmassEnergy-currentMass-targetMass; |
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| 205 | G4double forwardEnergy = freeEnergy/2.; |
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| 206 | G4int forwardCount = 1; // number of particles in forward hemisphere |
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| 207 | |
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| 208 | G4double backwardEnergy = freeEnergy/2.; |
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| 209 | G4int backwardCount = 1; // number of particles in backward hemisphere |
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| 210 | |
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| 211 | if(veryForward) |
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| 212 | { |
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| 213 | if(currentParticle.GetSide()==-1) |
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| 214 | { |
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| 215 | forwardEnergy += currentMass; |
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| 216 | forwardCount --; |
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| 217 | backwardEnergy -= currentMass; |
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| 218 | backwardCount ++; |
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| 219 | } |
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| 220 | if(targetParticle.GetSide()!=-1) |
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| 221 | { |
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| 222 | backwardEnergy += targetMass; |
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| 223 | backwardCount --; |
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| 224 | forwardEnergy -= targetMass; |
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| 225 | forwardCount ++; |
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| 226 | } |
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| 227 | } |
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| 228 | |
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| 229 | for( i=0; i<vecLen; ++i ) |
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| 230 | { |
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| 231 | if( vec[i]->GetSide() == -1 ) |
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| 232 | { |
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| 233 | ++backwardCount; |
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| 234 | backwardEnergy -= vec[i]->GetMass()/GeV; |
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| 235 | } else { |
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| 236 | ++forwardCount; |
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| 237 | forwardEnergy -= vec[i]->GetMass()/GeV; |
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| 238 | } |
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| 239 | } |
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| 240 | // |
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| 241 | // Add particles from intranuclear cascade. |
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| 242 | // nuclearExcitationCount = number of new secondaries produced by nuclear excitation |
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| 243 | // extraCount = number of nucleons within these new secondaries |
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| 244 | // |
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| 245 | G4double xtarg; |
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| 246 | if( centerofmassEnergy < (2.0+G4UniformRand()) ) |
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| 247 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2.0*backwardCount+vecLen+2)/2.0; |
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| 248 | else |
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| 249 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2.0*backwardCount); |
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| 250 | if( xtarg <= 0.0 )xtarg = 0.01; |
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| 251 | G4int nuclearExcitationCount = Poisson( xtarg ); |
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| 252 | if(atomicWeight<1.0001) nuclearExcitationCount = 0; |
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| 253 | G4int extraNucleonCount = 0; |
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| 254 | G4double extraNucleonMass = 0.0; |
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| 255 | if( nuclearExcitationCount > 0 ) |
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| 256 | { |
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| 257 | const G4double nucsup[] = { 1.00, 0.7, 0.5, 0.4, 0.35, 0.3 }; |
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| 258 | const G4double psup[] = { 3., 6., 20., 50., 100., 1000. }; |
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| 259 | G4int momentumBin = 0; |
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| 260 | while( (momentumBin < 6) && |
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| 261 | (modifiedOriginal.GetTotalMomentum()/GeV > psup[momentumBin]) ) |
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| 262 | ++momentumBin; |
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| 263 | momentumBin = std::min( 5, momentumBin ); |
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| 264 | // |
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| 265 | // NOTE: in GENXPT, these new particles were given negative codes |
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| 266 | // here I use NewlyAdded = true instead |
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| 267 | // |
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| 268 | |
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| 269 | for( i=0; i<nuclearExcitationCount; ++i ) |
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| 270 | { |
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| 271 | G4ReactionProduct * pVec = new G4ReactionProduct(); |
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| 272 | if( G4UniformRand() < nucsup[momentumBin] ) |
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| 273 | { |
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| 274 | if( G4UniformRand() > 1.0-atomicNumber/atomicWeight ) |
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| 275 | pVec->SetDefinition( aProton ); |
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| 276 | else |
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| 277 | pVec->SetDefinition( aNeutron ); |
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| 278 | pVec->SetSide( -2 ); // -2 means backside nucleon |
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| 279 | ++extraNucleonCount; |
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| 280 | backwardEnergy += pVec->GetMass()/GeV; |
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| 281 | extraNucleonMass += pVec->GetMass()/GeV; |
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| 282 | } |
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| 283 | else |
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| 284 | { |
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| 285 | G4double ran = G4UniformRand(); |
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| 286 | if( ran < 0.3181 ) |
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| 287 | pVec->SetDefinition( aPiPlus ); |
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| 288 | else if( ran < 0.6819 ) |
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| 289 | pVec->SetDefinition( aPiZero ); |
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| 290 | else |
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| 291 | pVec->SetDefinition( aPiMinus ); |
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| 292 | pVec->SetSide( -1 ); // backside particle, but not a nucleon |
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| 293 | } |
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| 294 | pVec->SetNewlyAdded( true ); // true is the same as IPA(i)<0 |
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| 295 | vec.SetElement( vecLen++, pVec ); |
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| 296 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 297 | backwardEnergy -= pVec->GetMass()/GeV; |
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| 298 | ++backwardCount; |
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| 299 | } |
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| 300 | } |
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| 301 | // |
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| 302 | // assume conservation of kinetic energy in forward & backward hemispheres |
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| 303 | // |
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| 304 | G4int is, iskip; |
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| 305 | while( forwardEnergy <= 0.0 ) // must eliminate a particle from the forward side |
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| 306 | { |
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| 307 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 308 | iskip = G4int(G4UniformRand()*forwardCount) + 1; // 1 <= iskip <= forwardCount |
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| 309 | is = 0; |
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| 310 | G4int forwardParticlesLeft = 0; |
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| 311 | for( i=(vecLen-1); i>=0; --i ) |
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| 312 | { |
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| 313 | if( vec[i]->GetSide() == 1 && vec[i]->GetMayBeKilled()) |
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| 314 | { |
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| 315 | forwardParticlesLeft = 1; |
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| 316 | if( ++is == iskip ) |
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| 317 | { |
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| 318 | forwardEnergy += vec[i]->GetMass()/GeV; |
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| 319 | for( G4int j=i; j<(vecLen-1); j++ )*vec[j] = *vec[j+1]; // shift up |
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| 320 | --forwardCount; |
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| 321 | delete vec[vecLen-1]; |
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| 322 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
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| 323 | break; // --+ |
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| 324 | } // | |
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| 325 | } // | |
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| 326 | } // break goes down to here |
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| 327 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 328 | if( forwardParticlesLeft == 0 ) |
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| 329 | { |
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| 330 | G4int iremove = -1; |
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| 331 | for (G4int i = 0; i < vecLen; i++) { |
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| 332 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
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| 333 | iremove = i; |
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| 334 | break; |
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| 335 | } |
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| 336 | } |
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| 337 | if (iremove == -1) { |
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| 338 | for (G4int i = 0; i < vecLen; i++) { |
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| 339 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
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| 340 | iremove = i; |
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| 341 | break; |
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| 342 | } |
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| 343 | } |
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| 344 | } |
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| 345 | if (iremove == -1) iremove = 0; |
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| 346 | |
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| 347 | forwardEnergy += vec[iremove]->GetMass()/GeV; |
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| 348 | if (vec[iremove]->GetSide() > 0) --forwardCount; |
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| 349 | |
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| 350 | for (G4int i = iremove; i < vecLen-1; i++) *vec[i] = *vec[i+1]; |
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| 351 | delete vec[vecLen-1]; |
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| 352 | vecLen--; |
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| 353 | if (vecLen == 0) return false; // all secondaries have been eliminated |
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| 354 | break; |
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| 355 | } |
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| 356 | } // while |
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| 357 | |
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| 358 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 359 | while( backwardEnergy <= 0.0 ) // must eliminate a particle from the backward side |
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| 360 | { |
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| 361 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 362 | iskip = G4int(G4UniformRand()*backwardCount) + 1; // 1 <= iskip <= backwardCount |
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| 363 | is = 0; |
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| 364 | G4int backwardParticlesLeft = 0; |
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| 365 | for( i=(vecLen-1); i>=0; --i ) |
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| 366 | { |
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| 367 | if( vec[i]->GetSide() < 0 && vec[i]->GetMayBeKilled()) |
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| 368 | { |
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| 369 | backwardParticlesLeft = 1; |
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| 370 | if( ++is == iskip ) // eliminate the i'th particle |
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| 371 | { |
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| 372 | if( vec[i]->GetSide() == -2 ) |
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| 373 | { |
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| 374 | --extraNucleonCount; |
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| 375 | extraNucleonMass -= vec[i]->GetMass()/GeV; |
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| 376 | backwardEnergy -= vec[i]->GetTotalEnergy()/GeV; |
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| 377 | } |
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| 378 | backwardEnergy += vec[i]->GetTotalEnergy()/GeV; |
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| 379 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
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| 380 | --backwardCount; |
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| 381 | delete vec[vecLen-1]; |
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| 382 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
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| 383 | break; |
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| 384 | } |
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| 385 | } |
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| 386 | } |
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| 387 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 388 | if( backwardParticlesLeft == 0 ) |
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| 389 | { |
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| 390 | G4int iremove = -1; |
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| 391 | for (G4int i = 0; i < vecLen; i++) { |
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| 392 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
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| 393 | iremove = i; |
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| 394 | break; |
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| 395 | } |
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| 396 | } |
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| 397 | if (iremove == -1) { |
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| 398 | for (G4int i = 0; i < vecLen; i++) { |
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| 399 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
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| 400 | iremove = i; |
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| 401 | break; |
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| 402 | } |
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| 403 | } |
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| 404 | } |
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| 405 | if (iremove == -1) iremove = 0; |
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| 406 | |
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| 407 | backwardEnergy += vec[iremove]->GetMass()/GeV; |
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| 408 | if (vec[iremove]->GetSide() > 0) --backwardCount; |
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| 409 | |
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| 410 | for (G4int i = iremove; i < vecLen-1; i++) *vec[i] = *vec[i+1]; |
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| 411 | delete vec[vecLen-1]; |
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| 412 | vecLen--; |
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| 413 | if (vecLen == 0) return false; // all secondaries have been eliminated |
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| 414 | break; |
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| 415 | } |
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| 416 | } // while |
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| 417 | |
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| 418 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 419 | // |
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| 420 | // define initial state vectors for Lorentz transformations |
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| 421 | // the pseudoParticles have non-standard masses, hence the "pseudo" |
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| 422 | // |
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| 423 | G4ReactionProduct pseudoParticle[10]; |
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| 424 | for( i=0; i<10; ++i )pseudoParticle[i].SetZero(); |
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| 425 | |
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| 426 | pseudoParticle[0].SetMass( mOriginal*GeV ); |
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| 427 | pseudoParticle[0].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
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| 428 | pseudoParticle[0].SetTotalEnergy( |
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| 429 | std::sqrt( pOriginal*pOriginal + mOriginal*mOriginal )*GeV ); |
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| 430 | |
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| 431 | pseudoParticle[1].SetMass( protonMass*MeV ); // this could be targetMass |
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| 432 | pseudoParticle[1].SetTotalEnergy( protonMass*MeV ); |
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| 433 | |
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| 434 | pseudoParticle[3].SetMass( protonMass*(1+extraNucleonCount)*MeV ); |
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| 435 | pseudoParticle[3].SetTotalEnergy( protonMass*(1+extraNucleonCount)*MeV ); |
---|
| 436 | |
---|
| 437 | pseudoParticle[8].SetMomentum( 1.0*GeV, 0.0, 0.0 ); |
---|
| 438 | |
---|
| 439 | pseudoParticle[2] = pseudoParticle[0] + pseudoParticle[1]; |
---|
| 440 | pseudoParticle[3] = pseudoParticle[3] + pseudoParticle[0]; |
---|
| 441 | |
---|
| 442 | pseudoParticle[0].Lorentz( pseudoParticle[0], pseudoParticle[2] ); |
---|
| 443 | pseudoParticle[1].Lorentz( pseudoParticle[1], pseudoParticle[2] ); |
---|
| 444 | |
---|
| 445 | G4double dndl[20]; |
---|
| 446 | // |
---|
| 447 | // main loop for 4-momentum generation |
---|
| 448 | // see Pitha-report (Aachen) for a detailed description of the method |
---|
| 449 | // |
---|
| 450 | G4double aspar, pt, et, x, pp, pp1, rmb, wgt; |
---|
| 451 | G4int innerCounter, outerCounter; |
---|
| 452 | G4bool eliminateThisParticle, resetEnergies, constantCrossSection; |
---|
| 453 | |
---|
| 454 | G4double forwardKinetic = 0.0, backwardKinetic = 0.0; |
---|
| 455 | // |
---|
| 456 | // process the secondary particles in reverse order |
---|
| 457 | // the incident particle is Done after the secondaries |
---|
| 458 | // nucleons, including the target, in the backward hemisphere are also Done later |
---|
| 459 | // |
---|
| 460 | G4double binl[20] = {0.,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0,1.11,1.25, |
---|
| 461 | 1.43,1.67,2.0,2.5,3.33,5.00,10.00}; |
---|
| 462 | G4int backwardNucleonCount = 0; // number of nucleons in backward hemisphere |
---|
| 463 | G4double totalEnergy, kineticEnergy, vecMass; |
---|
| 464 | |
---|
| 465 | for( i=(vecLen-1); i>=0; --i ) |
---|
| 466 | { |
---|
| 467 | G4double phi = G4UniformRand()*twopi; |
---|
| 468 | if( vec[i]->GetNewlyAdded() ) // added from intranuclear cascade |
---|
| 469 | { |
---|
| 470 | if( vec[i]->GetSide() == -2 ) // is a nucleon |
---|
| 471 | { |
---|
| 472 | if( backwardNucleonCount < 18 ) |
---|
| 473 | { |
---|
| 474 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 475 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
---|
| 476 | vecLen = 0; |
---|
| 477 | throw G4HadReentrentException(__FILE__, __LINE__, |
---|
| 478 | "G4ReactionDynamics::GenerateXandPt : a pion has been counted as a backward nucleon"); |
---|
| 479 | } |
---|
| 480 | vec[i]->SetSide( -3 ); |
---|
| 481 | ++backwardNucleonCount; |
---|
| 482 | continue; |
---|
| 483 | } |
---|
| 484 | } |
---|
| 485 | } |
---|
| 486 | // |
---|
| 487 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
| 488 | // set mass parameter for lambda fragmentation model |
---|
| 489 | // |
---|
| 490 | vecMass = vec[i]->GetMass()/GeV; |
---|
| 491 | G4double ran = -std::log(1.0-G4UniformRand())/3.5; |
---|
| 492 | if( vec[i]->GetSide() == -2 ) // backward nucleon |
---|
| 493 | { |
---|
| 494 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 495 | vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 496 | aspar = 0.75; |
---|
| 497 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
| 498 | } else { // vec[i] must be a proton, neutron, |
---|
| 499 | aspar = 0.20; // lambda, sigma, xsi, or ion |
---|
| 500 | pt = std::sqrt( std::pow( ran, 1.2 ) ); |
---|
| 501 | } |
---|
| 502 | |
---|
| 503 | } else { // not a backward nucleon |
---|
| 504 | |
---|
| 505 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 506 | aspar = 0.75; |
---|
| 507 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
| 508 | } else if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
---|
| 509 | aspar = 0.70; |
---|
| 510 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
| 511 | } else { // vec[i] must be a proton, neutron, |
---|
| 512 | aspar = 0.65; // lambda, sigma, xsi, or ion |
---|
| 513 | pt = std::sqrt( std::pow( ran, 1.5 ) ); |
---|
| 514 | } |
---|
| 515 | } |
---|
| 516 | pt = std::max( 0.001, pt ); |
---|
| 517 | vec[i]->SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
| 518 | for( G4int j=0; j<20; ++j )binl[j] = j/(19.*pt); |
---|
| 519 | if( vec[i]->GetSide() > 0 ) |
---|
| 520 | et = pseudoParticle[0].GetTotalEnergy()/GeV; |
---|
| 521 | else |
---|
| 522 | et = pseudoParticle[1].GetTotalEnergy()/GeV; |
---|
| 523 | dndl[0] = 0.0; |
---|
| 524 | // |
---|
| 525 | // start of outer iteration loop |
---|
| 526 | // |
---|
| 527 | outerCounter = 0; |
---|
| 528 | eliminateThisParticle = true; |
---|
| 529 | resetEnergies = true; |
---|
| 530 | while( ++outerCounter < 3 ) |
---|
| 531 | { |
---|
| 532 | for( l=1; l<20; ++l ) |
---|
| 533 | { |
---|
| 534 | x = (binl[l]+binl[l-1])/2.; |
---|
| 535 | pt = std::max( 0.001, pt ); |
---|
| 536 | if( x > 1.0/pt ) |
---|
| 537 | dndl[l] += dndl[l-1]; // changed from just = on 02 April 98 |
---|
| 538 | else |
---|
| 539 | dndl[l] = et * aspar/std::sqrt( std::pow((1.+aspar*x*aspar*x),3) ) |
---|
| 540 | * (binl[l]-binl[l-1]) / std::sqrt( pt*x*et*pt*x*et + pt*pt + vecMass*vecMass ) |
---|
| 541 | + dndl[l-1]; |
---|
| 542 | } |
---|
| 543 | innerCounter = 0; |
---|
| 544 | vec[i]->SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
| 545 | // |
---|
| 546 | // start of inner iteration loop |
---|
| 547 | // |
---|
| 548 | while( ++innerCounter < 7 ) |
---|
| 549 | { |
---|
| 550 | ran = G4UniformRand()*dndl[19]; |
---|
| 551 | l = 1; |
---|
| 552 | while( ( ran >= dndl[l] ) && ( l < 20 ) )l++; |
---|
| 553 | l = std::min( 19, l ); |
---|
| 554 | x = std::min( 1.0, pt*(binl[l-1] + G4UniformRand()*(binl[l]-binl[l-1])/2.) ); |
---|
| 555 | if( vec[i]->GetSide() < 0 )x *= -1.; |
---|
| 556 | vec[i]->SetMomentum( x*et*GeV ); // set the z-momentum |
---|
| 557 | totalEnergy = std::sqrt( x*et*x*et + pt*pt + vecMass*vecMass ); |
---|
| 558 | vec[i]->SetTotalEnergy( totalEnergy*GeV ); |
---|
| 559 | kineticEnergy = vec[i]->GetKineticEnergy()/GeV; |
---|
| 560 | if( vec[i]->GetSide() > 0 ) // forward side |
---|
| 561 | { |
---|
| 562 | if( (forwardKinetic+kineticEnergy) < 0.95*forwardEnergy ) |
---|
| 563 | { |
---|
| 564 | pseudoParticle[4] = pseudoParticle[4] + (*vec[i]); |
---|
| 565 | forwardKinetic += kineticEnergy; |
---|
| 566 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
| 567 | pseudoParticle[6].SetMomentum( 0.0 ); // set the z-momentum |
---|
| 568 | phi = pseudoParticle[6].Angle( pseudoParticle[8] ); |
---|
| 569 | if( pseudoParticle[6].GetMomentum().y()/MeV < 0.0 )phi = twopi - phi; |
---|
| 570 | phi += pi + normal()*pi/12.0; |
---|
| 571 | if( phi > twopi )phi -= twopi; |
---|
| 572 | if( phi < 0.0 )phi = twopi - phi; |
---|
| 573 | outerCounter = 2; // leave outer loop |
---|
| 574 | eliminateThisParticle = false; // don't eliminate this particle |
---|
| 575 | resetEnergies = false; |
---|
| 576 | break; // leave inner loop |
---|
| 577 | } |
---|
| 578 | if( innerCounter > 5 )break; // leave inner loop |
---|
| 579 | if( backwardEnergy >= vecMass ) // switch sides |
---|
| 580 | { |
---|
| 581 | vec[i]->SetSide( -1 ); |
---|
| 582 | forwardEnergy += vecMass; |
---|
| 583 | backwardEnergy -= vecMass; |
---|
| 584 | ++backwardCount; |
---|
| 585 | } |
---|
| 586 | } else { // backward side |
---|
| 587 | if( extraNucleonCount > 19 ) // commented out to duplicate ?bug? in GENXPT |
---|
| 588 | x = 0.999; |
---|
| 589 | G4double xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
| 590 | if( (backwardKinetic+kineticEnergy) < xxx*backwardEnergy ) |
---|
| 591 | { |
---|
| 592 | pseudoParticle[5] = pseudoParticle[5] + (*vec[i]); |
---|
| 593 | backwardKinetic += kineticEnergy; |
---|
| 594 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
| 595 | pseudoParticle[6].SetMomentum( 0.0 ); // set the z-momentum |
---|
| 596 | phi = pseudoParticle[6].Angle( pseudoParticle[8] ); |
---|
| 597 | if( pseudoParticle[6].GetMomentum().y()/MeV < 0.0 )phi = twopi - phi; |
---|
| 598 | phi += pi + normal() * pi / 12.0; |
---|
| 599 | if( phi > twopi )phi -= twopi; |
---|
| 600 | if( phi < 0.0 )phi = twopi - phi; |
---|
| 601 | outerCounter = 2; // leave outer loop |
---|
| 602 | eliminateThisParticle = false; // don't eliminate this particle |
---|
| 603 | resetEnergies = false; |
---|
| 604 | break; // leave inner loop |
---|
| 605 | } |
---|
| 606 | if( innerCounter > 5 )break; // leave inner loop |
---|
| 607 | if( forwardEnergy >= vecMass ) // switch sides |
---|
| 608 | { |
---|
| 609 | vec[i]->SetSide( 1 ); |
---|
| 610 | forwardEnergy -= vecMass; |
---|
| 611 | backwardEnergy += vecMass; |
---|
| 612 | backwardCount--; |
---|
| 613 | } |
---|
| 614 | } |
---|
| 615 | G4ThreeVector momentum = vec[i]->GetMomentum(); |
---|
| 616 | vec[i]->SetMomentum( momentum.x() * 0.9, momentum.y() * 0.9 ); |
---|
| 617 | pt *= 0.9; |
---|
| 618 | dndl[19] *= 0.9; |
---|
| 619 | } // closes inner loop |
---|
| 620 | if( resetEnergies ) |
---|
| 621 | { |
---|
| 622 | // if we get to here, the inner loop has been Done 6 Times |
---|
| 623 | // reset the kinetic energies of previously Done particles, if they are lighter |
---|
| 624 | // than protons and in the forward hemisphere |
---|
| 625 | // then continue with outer loop |
---|
| 626 | // |
---|
| 627 | forwardKinetic = 0.0; |
---|
| 628 | backwardKinetic = 0.0; |
---|
| 629 | pseudoParticle[4].SetZero(); |
---|
| 630 | pseudoParticle[5].SetZero(); |
---|
| 631 | for( l=i+1; l<vecLen; ++l ) |
---|
| 632 | { |
---|
| 633 | if (vec[l]->GetSide() > 0 || |
---|
| 634 | vec[l]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 635 | vec[l]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 636 | |
---|
| 637 | G4double tempMass = vec[l]->GetMass()/MeV; |
---|
| 638 | totalEnergy = 0.95*vec[l]->GetTotalEnergy()/MeV + 0.05*tempMass; |
---|
| 639 | totalEnergy = std::max( tempMass, totalEnergy ); |
---|
| 640 | vec[l]->SetTotalEnergy( totalEnergy*MeV ); |
---|
| 641 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - tempMass*tempMass ) ); |
---|
| 642 | pp1 = vec[l]->GetMomentum().mag()/MeV; |
---|
| 643 | if( pp1 < 1.0e-6*GeV ) |
---|
| 644 | { |
---|
| 645 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 646 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 647 | G4double phi = twopi*G4UniformRand(); |
---|
| 648 | vec[l]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 649 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 650 | pp*costheta*MeV ) ; |
---|
| 651 | } else { |
---|
| 652 | vec[l]->SetMomentum( vec[l]->GetMomentum() * (pp/pp1) ); |
---|
| 653 | } |
---|
| 654 | G4double px = vec[l]->GetMomentum().x()/MeV; |
---|
| 655 | G4double py = vec[l]->GetMomentum().y()/MeV; |
---|
| 656 | pt = std::max( 1.0, std::sqrt( px*px + py*py ) )/GeV; |
---|
| 657 | if( vec[l]->GetSide() > 0 ) |
---|
| 658 | { |
---|
| 659 | forwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
| 660 | pseudoParticle[4] = pseudoParticle[4] + (*vec[l]); |
---|
| 661 | } else { |
---|
| 662 | backwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
| 663 | pseudoParticle[5] = pseudoParticle[5] + (*vec[l]); |
---|
| 664 | } |
---|
| 665 | } // if pi, K or forward |
---|
| 666 | } // for l |
---|
| 667 | } // if resetEnergies |
---|
| 668 | } // closes outer loop |
---|
| 669 | |
---|
| 670 | if( eliminateThisParticle && vec[i]->GetMayBeKilled()) // not enough energy, eliminate this particle |
---|
| 671 | { |
---|
| 672 | if( vec[i]->GetSide() > 0 ) |
---|
| 673 | { |
---|
| 674 | --forwardCount; |
---|
| 675 | forwardEnergy += vecMass; |
---|
| 676 | } else { |
---|
| 677 | if( vec[i]->GetSide() == -2 ) |
---|
| 678 | { |
---|
| 679 | --extraNucleonCount; |
---|
| 680 | extraNucleonMass -= vecMass; |
---|
| 681 | backwardEnergy -= vecMass; |
---|
| 682 | } |
---|
| 683 | --backwardCount; |
---|
| 684 | backwardEnergy += vecMass; |
---|
| 685 | } |
---|
| 686 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
| 687 | G4ReactionProduct *temp = vec[vecLen-1]; |
---|
| 688 | delete temp; |
---|
| 689 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 690 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
---|
| 691 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
| 692 | pseudoParticle[6].SetMomentum( 0.0 ); // set z-momentum |
---|
| 693 | phi = pseudoParticle[6].Angle( pseudoParticle[8] ); |
---|
| 694 | if( pseudoParticle[6].GetMomentum().y()/MeV < 0.0 )phi = twopi - phi; |
---|
| 695 | phi += pi + normal() * pi / 12.0; |
---|
| 696 | if( phi > twopi )phi -= twopi; |
---|
| 697 | if( phi < 0.0 )phi = twopi - phi; |
---|
| 698 | } |
---|
| 699 | } // closes main for loop |
---|
| 700 | |
---|
| 701 | // |
---|
| 702 | // for the incident particle: it was placed in the forward hemisphere |
---|
| 703 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
| 704 | // set mass parameter for lambda fragmentation model |
---|
| 705 | // |
---|
| 706 | G4double phi = G4UniformRand()*twopi; |
---|
| 707 | G4double ran = -std::log(1.0-G4UniformRand()); |
---|
| 708 | if (currentParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 709 | aspar = 0.60; |
---|
| 710 | pt = std::sqrt( std::pow( ran/6.0, 1.7 ) ); |
---|
| 711 | } else if (currentParticle.GetDefinition()->GetParticleSubType() == "kaon") { |
---|
| 712 | aspar = 0.50; |
---|
| 713 | pt = std::sqrt( std::pow( ran/5.0, 1.4 ) ); |
---|
| 714 | } else { |
---|
| 715 | aspar = 0.40; |
---|
| 716 | pt = std::sqrt( std::pow( ran/4.0, 1.2 ) ); |
---|
| 717 | } |
---|
| 718 | |
---|
| 719 | for( G4int j=0; j<20; ++j )binl[j] = j/(19.*pt); |
---|
| 720 | currentParticle.SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
| 721 | et = pseudoParticle[0].GetTotalEnergy()/GeV; |
---|
| 722 | dndl[0] = 0.0; |
---|
| 723 | vecMass = currentParticle.GetMass()/GeV; |
---|
| 724 | for( l=1; l<20; ++l ) |
---|
| 725 | { |
---|
| 726 | x = (binl[l]+binl[l-1])/2.; |
---|
| 727 | if( x > 1.0/pt ) |
---|
| 728 | dndl[l] += dndl[l-1]; // changed from just = on 02 April 98 |
---|
| 729 | else |
---|
| 730 | dndl[l] = aspar/std::sqrt( std::pow((1.+sqr(aspar*x)),3) ) * |
---|
| 731 | (binl[l]-binl[l-1]) * et / std::sqrt( pt*x*et*pt*x*et + pt*pt + vecMass*vecMass ) + |
---|
| 732 | dndl[l-1]; |
---|
| 733 | } |
---|
| 734 | ran = G4UniformRand()*dndl[19]; |
---|
| 735 | l = 1; |
---|
| 736 | while( (ran>dndl[l]) && (l<20) )l++; |
---|
| 737 | l = std::min( 19, l ); |
---|
| 738 | x = std::min( 1.0, pt*(binl[l-1] + G4UniformRand()*(binl[l]-binl[l-1])/2.) ); |
---|
| 739 | currentParticle.SetMomentum( x*et*GeV ); // set the z-momentum |
---|
| 740 | if( forwardEnergy < forwardKinetic ) |
---|
| 741 | totalEnergy = vecMass + 0.04*std::fabs(normal()); |
---|
| 742 | else |
---|
| 743 | totalEnergy = vecMass + forwardEnergy - forwardKinetic; |
---|
| 744 | currentParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
| 745 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
| 746 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 747 | if( pp1 < 1.0e-6*GeV ) |
---|
| 748 | { |
---|
| 749 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 750 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 751 | G4double phi = twopi*G4UniformRand(); |
---|
| 752 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 753 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 754 | pp*costheta*MeV ) ; |
---|
| 755 | } else { |
---|
| 756 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 757 | } |
---|
| 758 | pseudoParticle[4] = pseudoParticle[4] + currentParticle; |
---|
| 759 | |
---|
| 760 | // |
---|
| 761 | // Current particle now finished |
---|
| 762 | // |
---|
| 763 | // Begin target particle |
---|
| 764 | // |
---|
| 765 | |
---|
| 766 | if( backwardNucleonCount < 18 ) |
---|
| 767 | { |
---|
| 768 | targetParticle.SetSide( -3 ); |
---|
| 769 | ++backwardNucleonCount; |
---|
| 770 | } |
---|
| 771 | else |
---|
| 772 | { |
---|
| 773 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
| 774 | // set mass parameter for lambda fragmentation model |
---|
| 775 | // |
---|
| 776 | vecMass = targetParticle.GetMass()/GeV; |
---|
| 777 | ran = -std::log(1.0-G4UniformRand()); |
---|
| 778 | aspar = 0.40; |
---|
| 779 | pt = std::max( 0.001, std::sqrt( std::pow( ran/4.0, 1.2 ) ) ); |
---|
| 780 | targetParticle.SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
| 781 | for( G4int j=0; j<20; ++j )binl[j] = (j-1.)/(19.*pt); |
---|
| 782 | et = pseudoParticle[1].GetTotalEnergy()/GeV; |
---|
| 783 | dndl[0] = 0.0; |
---|
| 784 | outerCounter = 0; |
---|
| 785 | eliminateThisParticle = true; // should never eliminate the target particle |
---|
| 786 | resetEnergies = true; |
---|
| 787 | while( ++outerCounter < 3 ) // start of outer iteration loop |
---|
| 788 | { |
---|
| 789 | for( l=1; l<20; ++l ) |
---|
| 790 | { |
---|
| 791 | x = (binl[l]+binl[l-1])/2.; |
---|
| 792 | if( x > 1.0/pt ) |
---|
| 793 | dndl[l] += dndl[l-1]; // changed from just = on 02 April 98 |
---|
| 794 | else |
---|
| 795 | dndl[l] = aspar/std::sqrt( std::pow((1.+aspar*x*aspar*x),3) ) * |
---|
| 796 | (binl[l]-binl[l-1])*et / std::sqrt( pt*x*et*pt*x*et+pt*pt+vecMass*vecMass ) + |
---|
| 797 | dndl[l-1]; |
---|
| 798 | } |
---|
| 799 | innerCounter = 0; |
---|
| 800 | while( ++innerCounter < 7 ) // start of inner iteration loop |
---|
| 801 | { |
---|
| 802 | l = 1; |
---|
| 803 | ran = G4UniformRand()*dndl[19]; |
---|
| 804 | while( ( ran >= dndl[l] ) && ( l < 20 ) )l++; |
---|
| 805 | l = std::min( 19, l ); |
---|
| 806 | x = std::min( 1.0, pt*(binl[l-1] + G4UniformRand()*(binl[l]-binl[l-1])/2.) ); |
---|
| 807 | if( targetParticle.GetSide() < 0 )x *= -1.; |
---|
| 808 | targetParticle.SetMomentum( x*et*GeV ); // set the z-momentum |
---|
| 809 | totalEnergy = std::sqrt( x*et*x*et + pt*pt + vecMass*vecMass ); |
---|
| 810 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
| 811 | if( targetParticle.GetSide() < 0 ) |
---|
| 812 | { |
---|
| 813 | if( extraNucleonCount > 19 )x=0.999; |
---|
| 814 | G4double xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
| 815 | if( (backwardKinetic+totalEnergy-vecMass) < xxx*backwardEnergy ) |
---|
| 816 | { |
---|
| 817 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
| 818 | backwardKinetic += totalEnergy - vecMass; |
---|
| 819 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
| 820 | pseudoParticle[6].SetMomentum( 0.0 ); // set z-momentum |
---|
| 821 | phi = pseudoParticle[6].Angle( pseudoParticle[8] ); |
---|
| 822 | if( pseudoParticle[6].GetMomentum().y()/MeV < 0.0 )phi = twopi - phi; |
---|
| 823 | phi += pi + normal() * pi / 12.0; |
---|
| 824 | if( phi > twopi )phi -= twopi; |
---|
| 825 | if( phi < 0.0 )phi = twopi - phi; |
---|
| 826 | outerCounter = 2; // leave outer loop |
---|
| 827 | eliminateThisParticle = false; // don't eliminate this particle |
---|
| 828 | resetEnergies = false; |
---|
| 829 | break; // leave inner loop |
---|
| 830 | } |
---|
| 831 | if( innerCounter > 5 )break; // leave inner loop |
---|
| 832 | if( forwardEnergy >= vecMass ) // switch sides |
---|
| 833 | { |
---|
| 834 | targetParticle.SetSide( 1 ); |
---|
| 835 | forwardEnergy -= vecMass; |
---|
| 836 | backwardEnergy += vecMass; |
---|
| 837 | --backwardCount; |
---|
| 838 | } |
---|
| 839 | G4ThreeVector momentum = targetParticle.GetMomentum(); |
---|
| 840 | targetParticle.SetMomentum( momentum.x() * 0.9, momentum.y() * 0.9 ); |
---|
| 841 | pt *= 0.9; |
---|
| 842 | dndl[19] *= 0.9; |
---|
| 843 | } |
---|
| 844 | else // target has gone to forward side |
---|
| 845 | { |
---|
| 846 | if( forwardEnergy < forwardKinetic ) |
---|
| 847 | totalEnergy = vecMass + 0.04*std::fabs(normal()); |
---|
| 848 | else |
---|
| 849 | totalEnergy = vecMass + forwardEnergy - forwardKinetic; |
---|
| 850 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
| 851 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
| 852 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
| 853 | if( pp1 < 1.0e-6*GeV ) |
---|
| 854 | { |
---|
| 855 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 856 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 857 | G4double phi = twopi*G4UniformRand(); |
---|
| 858 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 859 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 860 | pp*costheta*MeV ) ; |
---|
| 861 | } |
---|
| 862 | else |
---|
| 863 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 864 | |
---|
| 865 | pseudoParticle[4] = pseudoParticle[4] + targetParticle; |
---|
| 866 | outerCounter = 2; // leave outer loop |
---|
| 867 | eliminateThisParticle = false; // don't eliminate this particle |
---|
| 868 | resetEnergies = false; |
---|
| 869 | break; // leave inner loop |
---|
| 870 | } |
---|
| 871 | } // closes inner loop |
---|
| 872 | if( resetEnergies ) |
---|
| 873 | { |
---|
| 874 | // if we get to here, the inner loop has been Done 6 Times |
---|
| 875 | // reset the kinetic energies of previously Done particles, if they are lighter |
---|
| 876 | // than protons and in the forward hemisphere |
---|
| 877 | // then continue with outer loop |
---|
| 878 | |
---|
| 879 | forwardKinetic = backwardKinetic = 0.0; |
---|
| 880 | pseudoParticle[4].SetZero(); |
---|
| 881 | pseudoParticle[5].SetZero(); |
---|
| 882 | for( l=0; l<vecLen; ++l ) // changed from l=1 on 02 April 98 |
---|
| 883 | { |
---|
| 884 | if (vec[l]->GetSide() > 0 || |
---|
| 885 | vec[l]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 886 | vec[l]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 887 | G4double tempMass = vec[l]->GetMass()/GeV; |
---|
| 888 | totalEnergy = |
---|
| 889 | std::max( tempMass, 0.95*vec[l]->GetTotalEnergy()/GeV + 0.05*tempMass ); |
---|
| 890 | vec[l]->SetTotalEnergy( totalEnergy*GeV ); |
---|
| 891 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - tempMass*tempMass ) )*GeV; |
---|
| 892 | pp1 = vec[l]->GetMomentum().mag()/MeV; |
---|
| 893 | if( pp1 < 1.0e-6*GeV ) |
---|
| 894 | { |
---|
| 895 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 896 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 897 | G4double phi = twopi*G4UniformRand(); |
---|
| 898 | vec[l]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 899 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 900 | pp*costheta*MeV ) ; |
---|
| 901 | } |
---|
| 902 | else |
---|
| 903 | vec[l]->SetMomentum( vec[l]->GetMomentum() * (pp/pp1) ); |
---|
| 904 | |
---|
| 905 | pt = std::max( 0.001*GeV, std::sqrt( sqr(vec[l]->GetMomentum().x()/MeV) + |
---|
| 906 | sqr(vec[l]->GetMomentum().y()/MeV) ) )/GeV; |
---|
| 907 | if( vec[l]->GetSide() > 0) |
---|
| 908 | { |
---|
| 909 | forwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
| 910 | pseudoParticle[4] = pseudoParticle[4] + (*vec[l]); |
---|
| 911 | } else { |
---|
| 912 | backwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
| 913 | pseudoParticle[5] = pseudoParticle[5] + (*vec[l]); |
---|
| 914 | } |
---|
| 915 | } // if pi, K or forward |
---|
| 916 | } // for l |
---|
| 917 | } // if (resetEnergies) |
---|
| 918 | } // closes outer loop |
---|
| 919 | |
---|
| 920 | // if( eliminateThisParticle ) // not enough energy, eliminate target |
---|
| 921 | // { |
---|
| 922 | // G4cerr << "Warning: eliminating target particle" << G4endl; |
---|
| 923 | // exit( EXIT_FAILURE ); |
---|
| 924 | // } |
---|
| 925 | } |
---|
| 926 | // |
---|
| 927 | // Target particle finished. |
---|
| 928 | // |
---|
| 929 | // Now produce backward nucleons with a cluster model |
---|
| 930 | // |
---|
| 931 | pseudoParticle[6].Lorentz( pseudoParticle[3], pseudoParticle[2] ); |
---|
| 932 | pseudoParticle[6] = pseudoParticle[6] - pseudoParticle[4]; |
---|
| 933 | pseudoParticle[6] = pseudoParticle[6] - pseudoParticle[5]; |
---|
| 934 | if( backwardNucleonCount == 1 ) // target particle is the only backward nucleon |
---|
| 935 | { |
---|
| 936 | G4double ekin = |
---|
| 937 | std::min( backwardEnergy-backwardKinetic, centerofmassEnergy/2.0-protonMass/GeV ); |
---|
| 938 | |
---|
| 939 | if( ekin < 0.04 )ekin = 0.04 * std::fabs( normal() ); |
---|
| 940 | vecMass = targetParticle.GetMass()/GeV; |
---|
| 941 | totalEnergy = ekin+vecMass; |
---|
| 942 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
| 943 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
| 944 | pp1 = pseudoParticle[6].GetMomentum().mag()/MeV; |
---|
| 945 | if( pp1 < 1.0e-6*GeV ) |
---|
| 946 | { |
---|
| 947 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 948 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 949 | G4double phi = twopi*G4UniformRand(); |
---|
| 950 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 951 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 952 | pp*costheta*MeV ) ; |
---|
| 953 | } else { |
---|
| 954 | targetParticle.SetMomentum( pseudoParticle[6].GetMomentum() * (pp/pp1) ); |
---|
| 955 | } |
---|
| 956 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
| 957 | } |
---|
| 958 | else // more than one backward nucleon |
---|
| 959 | { |
---|
| 960 | const G4double cpar[] = { 0.6, 0.6, 0.35, 0.15, 0.10 }; |
---|
| 961 | const G4double gpar[] = { 2.6, 2.6, 1.80, 1.30, 1.20 }; |
---|
| 962 | // Replaced the following min function to get correct behaviour on DEC. |
---|
| 963 | // G4int tempCount = std::min( 5, backwardNucleonCount ) - 1; |
---|
| 964 | G4int tempCount; |
---|
| 965 | if (backwardNucleonCount < 5) |
---|
| 966 | { |
---|
| 967 | tempCount = backwardNucleonCount; |
---|
| 968 | } |
---|
| 969 | else |
---|
| 970 | { |
---|
| 971 | tempCount = 5; |
---|
| 972 | } |
---|
| 973 | tempCount--; |
---|
| 974 | //cout << "backwardNucleonCount " << backwardNucleonCount << G4endl; |
---|
| 975 | //cout << "tempCount " << tempCount << G4endl; |
---|
| 976 | G4double rmb0 = 0.0; |
---|
| 977 | if( targetParticle.GetSide() == -3 ) |
---|
| 978 | rmb0 += targetParticle.GetMass()/GeV; |
---|
| 979 | for( i=0; i<vecLen; ++i ) |
---|
| 980 | { |
---|
| 981 | if( vec[i]->GetSide() == -3 )rmb0 += vec[i]->GetMass()/GeV; |
---|
| 982 | } |
---|
| 983 | rmb = rmb0 + std::pow(-std::log(1.0-G4UniformRand()),cpar[tempCount]) / gpar[tempCount]; |
---|
| 984 | totalEnergy = pseudoParticle[6].GetTotalEnergy()/GeV; |
---|
| 985 | vecMass = std::min( rmb, totalEnergy ); |
---|
| 986 | pseudoParticle[6].SetMass( vecMass*GeV ); |
---|
| 987 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
| 988 | pp1 = pseudoParticle[6].GetMomentum().mag()/MeV; |
---|
| 989 | if( pp1 < 1.0e-6*GeV ) |
---|
| 990 | { |
---|
| 991 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 992 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 993 | G4double phi = twopi*G4UniformRand(); |
---|
| 994 | pseudoParticle[6].SetMomentum( -pp*sintheta*std::cos(phi)*MeV, |
---|
| 995 | -pp*sintheta*std::sin(phi)*MeV, |
---|
| 996 | -pp*costheta*MeV ) ; |
---|
| 997 | } |
---|
| 998 | else |
---|
| 999 | pseudoParticle[6].SetMomentum( pseudoParticle[6].GetMomentum() * (-pp/pp1) ); |
---|
| 1000 | |
---|
| 1001 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; // tempV contains the backward nucleons |
---|
| 1002 | tempV.Initialize( backwardNucleonCount ); |
---|
| 1003 | G4int tempLen = 0; |
---|
| 1004 | if( targetParticle.GetSide() == -3 )tempV.SetElement( tempLen++, &targetParticle ); |
---|
| 1005 | for( i=0; i<vecLen; ++i ) |
---|
| 1006 | { |
---|
| 1007 | if( vec[i]->GetSide() == -3 )tempV.SetElement( tempLen++, vec[i] ); |
---|
| 1008 | } |
---|
| 1009 | if( tempLen != backwardNucleonCount ) |
---|
| 1010 | { |
---|
| 1011 | G4cerr << "tempLen is not the same as backwardNucleonCount" << G4endl; |
---|
| 1012 | G4cerr << "tempLen = " << tempLen; |
---|
| 1013 | G4cerr << ", backwardNucleonCount = " << backwardNucleonCount << G4endl; |
---|
| 1014 | G4cerr << "targetParticle side = " << targetParticle.GetSide() << G4endl; |
---|
| 1015 | G4cerr << "currentParticle side = " << currentParticle.GetSide() << G4endl; |
---|
| 1016 | for( i=0; i<vecLen; ++i ) |
---|
| 1017 | G4cerr << "particle #" << i << " side = " << vec[i]->GetSide() << G4endl; |
---|
| 1018 | exit( EXIT_FAILURE ); |
---|
| 1019 | } |
---|
| 1020 | constantCrossSection = true; |
---|
| 1021 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1022 | if( tempLen >= 2 ) |
---|
| 1023 | { |
---|
| 1024 | wgt = GenerateNBodyEvent( |
---|
| 1025 | pseudoParticle[6].GetMass(), constantCrossSection, tempV, tempLen ); |
---|
| 1026 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1027 | if( targetParticle.GetSide() == -3 ) |
---|
| 1028 | { |
---|
| 1029 | targetParticle.Lorentz( targetParticle, pseudoParticle[6] ); |
---|
| 1030 | // tempV contains the real stuff |
---|
| 1031 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
| 1032 | } |
---|
| 1033 | for( i=0; i<vecLen; ++i ) |
---|
| 1034 | { |
---|
| 1035 | if( vec[i]->GetSide() == -3 ) |
---|
| 1036 | { |
---|
| 1037 | vec[i]->Lorentz( *vec[i], pseudoParticle[6] ); |
---|
| 1038 | pseudoParticle[5] = pseudoParticle[5] + (*vec[i]); |
---|
| 1039 | } |
---|
| 1040 | } |
---|
| 1041 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1042 | } |
---|
| 1043 | } |
---|
| 1044 | // |
---|
| 1045 | // Lorentz transformation in lab system |
---|
| 1046 | // |
---|
| 1047 | if( vecLen == 0 )return false; // all the secondaries have been eliminated |
---|
| 1048 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1049 | |
---|
| 1050 | currentParticle.Lorentz( currentParticle, pseudoParticle[1] ); |
---|
| 1051 | targetParticle.Lorentz( targetParticle, pseudoParticle[1] ); |
---|
| 1052 | for( i=0; i<vecLen; ++i ) vec[i]->Lorentz( *vec[i], pseudoParticle[1] ); |
---|
| 1053 | |
---|
| 1054 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1055 | // |
---|
| 1056 | // leadFlag will be true |
---|
| 1057 | // iff original particle is at least as heavy as K+ and not a proton or |
---|
| 1058 | // neutron AND if incident particle is at least as heavy as K+ and it is |
---|
| 1059 | // not a proton or neutron leadFlag is set to the incident particle |
---|
| 1060 | // or |
---|
| 1061 | // target particle is at least as heavy as K+ and it is not a proton or |
---|
| 1062 | // neutron leadFlag is set to the target particle |
---|
| 1063 | // |
---|
| 1064 | G4bool leadingStrangeParticleHasChanged = true; |
---|
| 1065 | if( leadFlag ) |
---|
| 1066 | { |
---|
| 1067 | if( currentParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
| 1068 | leadingStrangeParticleHasChanged = false; |
---|
| 1069 | if( leadingStrangeParticleHasChanged && |
---|
| 1070 | ( targetParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) ) |
---|
| 1071 | leadingStrangeParticleHasChanged = false; |
---|
| 1072 | if( leadingStrangeParticleHasChanged ) |
---|
| 1073 | { |
---|
| 1074 | for( i=0; i<vecLen; i++ ) |
---|
| 1075 | { |
---|
| 1076 | if( vec[i]->GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
| 1077 | { |
---|
| 1078 | leadingStrangeParticleHasChanged = false; |
---|
| 1079 | break; |
---|
| 1080 | } |
---|
| 1081 | } |
---|
| 1082 | } |
---|
| 1083 | if( leadingStrangeParticleHasChanged ) |
---|
| 1084 | { |
---|
| 1085 | G4bool leadTest = |
---|
| 1086 | (leadingStrangeParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 1087 | leadingStrangeParticle.GetDefinition()->GetParticleSubType() == "pi"); |
---|
| 1088 | G4bool targetTest = |
---|
| 1089 | (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 1090 | targetParticle.GetDefinition()->GetParticleSubType() == "pi"); |
---|
| 1091 | |
---|
| 1092 | // following modified by JLC 22-Oct-97 |
---|
| 1093 | |
---|
| 1094 | if( (leadTest&&targetTest) || !(leadTest||targetTest) ) // both true or both false |
---|
| 1095 | { |
---|
| 1096 | targetParticle.SetDefinitionAndUpdateE( leadingStrangeParticle.GetDefinition() ); |
---|
| 1097 | targetHasChanged = true; |
---|
| 1098 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1099 | } |
---|
| 1100 | else |
---|
| 1101 | { |
---|
| 1102 | currentParticle.SetDefinitionAndUpdateE( leadingStrangeParticle.GetDefinition() ); |
---|
| 1103 | incidentHasChanged = false; |
---|
| 1104 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1105 | } |
---|
| 1106 | } |
---|
| 1107 | } // end of if( leadFlag ) |
---|
| 1108 | |
---|
| 1109 | // Get number of final state nucleons and nucleons remaining in |
---|
| 1110 | // target nucleus |
---|
| 1111 | |
---|
| 1112 | std::pair<G4int, G4int> finalStateNucleons = |
---|
| 1113 | GetFinalStateNucleons(originalTarget, vec, vecLen); |
---|
| 1114 | |
---|
| 1115 | G4int protonsInFinalState = finalStateNucleons.first; |
---|
| 1116 | G4int neutronsInFinalState = finalStateNucleons.second; |
---|
| 1117 | |
---|
| 1118 | G4int numberofFinalStateNucleons = |
---|
| 1119 | protonsInFinalState + neutronsInFinalState; |
---|
| 1120 | |
---|
| 1121 | if (currentParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
| 1122 | targetParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
| 1123 | originalIncident->GetDefinition()->GetPDGMass() < |
---|
| 1124 | G4Lambda::Lambda()->GetPDGMass()) |
---|
| 1125 | numberofFinalStateNucleons++; |
---|
| 1126 | |
---|
| 1127 | numberofFinalStateNucleons = std::max(1, numberofFinalStateNucleons); |
---|
| 1128 | |
---|
| 1129 | G4int PinNucleus = std::max(0, |
---|
| 1130 | G4int(targetNucleus.GetZ()) - protonsInFinalState); |
---|
| 1131 | G4int NinNucleus = std::max(0, |
---|
| 1132 | G4int(targetNucleus.GetN()-targetNucleus.GetZ()) - neutronsInFinalState); |
---|
| 1133 | |
---|
| 1134 | pseudoParticle[3].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
| 1135 | pseudoParticle[3].SetMass( mOriginal*GeV ); |
---|
| 1136 | pseudoParticle[3].SetTotalEnergy( |
---|
| 1137 | std::sqrt( pOriginal*pOriginal + mOriginal*mOriginal )*GeV ); |
---|
| 1138 | |
---|
| 1139 | G4ParticleDefinition * aOrgDef = modifiedOriginal.GetDefinition(); |
---|
| 1140 | G4int diff = 0; |
---|
| 1141 | if(aOrgDef == G4Proton::Proton() || aOrgDef == G4Neutron::Neutron() ) diff = 1; |
---|
| 1142 | if(numberofFinalStateNucleons == 1) diff = 0; |
---|
| 1143 | pseudoParticle[4].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 1144 | pseudoParticle[4].SetMass( protonMass*(numberofFinalStateNucleons-diff)*MeV ); |
---|
| 1145 | pseudoParticle[4].SetTotalEnergy( protonMass*(numberofFinalStateNucleons-diff)*MeV ); |
---|
| 1146 | |
---|
| 1147 | G4double theoreticalKinetic = |
---|
| 1148 | pseudoParticle[3].GetTotalEnergy()/MeV + |
---|
| 1149 | pseudoParticle[4].GetTotalEnergy()/MeV - |
---|
| 1150 | currentParticle.GetMass()/MeV - |
---|
| 1151 | targetParticle.GetMass()/MeV; |
---|
| 1152 | |
---|
| 1153 | G4double simulatedKinetic = |
---|
| 1154 | currentParticle.GetKineticEnergy()/MeV + targetParticle.GetKineticEnergy()/MeV; |
---|
| 1155 | |
---|
| 1156 | pseudoParticle[5] = pseudoParticle[3] + pseudoParticle[4]; |
---|
| 1157 | pseudoParticle[3].Lorentz( pseudoParticle[3], pseudoParticle[5] ); |
---|
| 1158 | pseudoParticle[4].Lorentz( pseudoParticle[4], pseudoParticle[5] ); |
---|
| 1159 | |
---|
| 1160 | pseudoParticle[7].SetZero(); |
---|
| 1161 | pseudoParticle[7] = pseudoParticle[7] + currentParticle; |
---|
| 1162 | pseudoParticle[7] = pseudoParticle[7] + targetParticle; |
---|
| 1163 | |
---|
| 1164 | for( i=0; i<vecLen; ++i ) |
---|
| 1165 | { |
---|
| 1166 | pseudoParticle[7] = pseudoParticle[7] + *vec[i]; |
---|
| 1167 | simulatedKinetic += vec[i]->GetKineticEnergy()/MeV; |
---|
| 1168 | theoreticalKinetic -= vec[i]->GetMass()/MeV; |
---|
| 1169 | } |
---|
| 1170 | |
---|
| 1171 | if( vecLen <= 16 && vecLen > 0 ) |
---|
| 1172 | { |
---|
| 1173 | // must create a new set of ReactionProducts here because GenerateNBody will |
---|
| 1174 | // modify the momenta for the particles, and we don't want to do this |
---|
| 1175 | // |
---|
| 1176 | G4ReactionProduct tempR[130]; |
---|
| 1177 | tempR[0] = currentParticle; |
---|
| 1178 | tempR[1] = targetParticle; |
---|
| 1179 | for( i=0; i<vecLen; ++i )tempR[i+2] = *vec[i]; |
---|
| 1180 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; |
---|
| 1181 | tempV.Initialize( vecLen+2 ); |
---|
| 1182 | G4int tempLen = 0; |
---|
| 1183 | for( i=0; i<vecLen+2; ++i )tempV.SetElement( tempLen++, &tempR[i] ); |
---|
| 1184 | constantCrossSection = true; |
---|
| 1185 | |
---|
| 1186 | wgt = GenerateNBodyEvent( pseudoParticle[3].GetTotalEnergy()/MeV+ |
---|
| 1187 | pseudoParticle[4].GetTotalEnergy()/MeV, |
---|
| 1188 | constantCrossSection, tempV, tempLen ); |
---|
| 1189 | if (wgt == -1) { |
---|
| 1190 | G4double Qvalue = 0; |
---|
| 1191 | for (i = 0; i < tempLen; i++) Qvalue += tempV[i]->GetMass(); |
---|
| 1192 | wgt = GenerateNBodyEvent( Qvalue/MeV, |
---|
| 1193 | constantCrossSection, tempV, tempLen ); |
---|
| 1194 | } |
---|
| 1195 | if(wgt>-.5) |
---|
| 1196 | { |
---|
| 1197 | theoreticalKinetic = 0.0; |
---|
| 1198 | for( i=0; i<tempLen; ++i ) |
---|
| 1199 | { |
---|
| 1200 | pseudoParticle[6].Lorentz( *tempV[i], pseudoParticle[4] ); |
---|
| 1201 | theoreticalKinetic += pseudoParticle[6].GetKineticEnergy()/MeV; |
---|
| 1202 | } |
---|
| 1203 | } |
---|
| 1204 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1205 | } |
---|
| 1206 | // |
---|
| 1207 | // Make sure, that the kinetic energies are correct |
---|
| 1208 | // |
---|
| 1209 | if( simulatedKinetic != 0.0 ) |
---|
| 1210 | { |
---|
| 1211 | wgt = (theoreticalKinetic)/simulatedKinetic; |
---|
| 1212 | theoreticalKinetic = currentParticle.GetKineticEnergy()/MeV * wgt; |
---|
| 1213 | simulatedKinetic = theoreticalKinetic; |
---|
| 1214 | currentParticle.SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
| 1215 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
| 1216 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 1217 | if( pp1 < 1.0e-6*GeV ) |
---|
| 1218 | { |
---|
| 1219 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 1220 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 1221 | G4double phi = twopi*G4UniformRand(); |
---|
| 1222 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 1223 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 1224 | pp*costheta*MeV ) ; |
---|
| 1225 | } |
---|
| 1226 | else |
---|
| 1227 | { |
---|
| 1228 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 1229 | } |
---|
| 1230 | theoreticalKinetic = targetParticle.GetKineticEnergy()/MeV * wgt; |
---|
| 1231 | targetParticle.SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
| 1232 | simulatedKinetic += theoreticalKinetic; |
---|
| 1233 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
| 1234 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
| 1235 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1236 | if( pp1 < 1.0e-6*GeV ) |
---|
| 1237 | { |
---|
| 1238 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 1239 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 1240 | G4double phi = twopi*G4UniformRand(); |
---|
| 1241 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 1242 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 1243 | pp*costheta*MeV ) ; |
---|
| 1244 | } else { |
---|
| 1245 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 1246 | } |
---|
| 1247 | for( i=0; i<vecLen; ++i ) |
---|
| 1248 | { |
---|
| 1249 | theoreticalKinetic = vec[i]->GetKineticEnergy()/MeV * wgt; |
---|
| 1250 | simulatedKinetic += theoreticalKinetic; |
---|
| 1251 | vec[i]->SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
| 1252 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
| 1253 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
| 1254 | if( pp1 < 1.0e-6*GeV ) |
---|
| 1255 | { |
---|
| 1256 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 1257 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 1258 | G4double phi = twopi*G4UniformRand(); |
---|
| 1259 | vec[i]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 1260 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 1261 | pp*costheta*MeV ) ; |
---|
| 1262 | } |
---|
| 1263 | else |
---|
| 1264 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
| 1265 | } |
---|
| 1266 | } |
---|
| 1267 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1268 | |
---|
| 1269 | Rotate( numberofFinalStateNucleons, pseudoParticle[3].GetMomentum(), |
---|
| 1270 | modifiedOriginal, originalIncident, targetNucleus, |
---|
| 1271 | currentParticle, targetParticle, vec, vecLen ); |
---|
| 1272 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1273 | // |
---|
| 1274 | // add black track particles |
---|
| 1275 | // the total number of particles produced is restricted to 198 |
---|
| 1276 | // this may have influence on very high energies |
---|
| 1277 | // |
---|
| 1278 | if( atomicWeight >= 1.5 ) |
---|
| 1279 | { |
---|
| 1280 | // npnb is number of proton/neutron black track particles |
---|
| 1281 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
| 1282 | // epnb is the kinetic energy available for proton/neutron black track particles |
---|
| 1283 | // edta is the kinetic energy available for deuteron/triton/alpha particles |
---|
| 1284 | // |
---|
| 1285 | G4int npnb = 0; |
---|
| 1286 | G4int ndta = 0; |
---|
| 1287 | |
---|
| 1288 | G4double epnb, edta; |
---|
| 1289 | if (veryForward) { |
---|
| 1290 | epnb = targetNucleus.GetAnnihilationPNBlackTrackEnergy(); |
---|
| 1291 | edta = targetNucleus.GetAnnihilationDTABlackTrackEnergy(); |
---|
| 1292 | } else { |
---|
| 1293 | epnb = targetNucleus.GetPNBlackTrackEnergy(); |
---|
| 1294 | edta = targetNucleus.GetDTABlackTrackEnergy(); |
---|
| 1295 | } |
---|
| 1296 | |
---|
| 1297 | const G4double pnCutOff = 0.001; |
---|
| 1298 | const G4double dtaCutOff = 0.001; |
---|
| 1299 | const G4double kineticMinimum = 1.e-6; |
---|
| 1300 | const G4double kineticFactor = -0.010; |
---|
| 1301 | G4double sprob = 0.0; // sprob = probability of self-absorption in heavy molecules |
---|
| 1302 | const G4double ekIncident = originalIncident->GetKineticEnergy()/GeV; |
---|
| 1303 | if( ekIncident >= 5.0 )sprob = std::min( 1.0, 0.6*std::log(ekIncident-4.0) ); |
---|
| 1304 | if( epnb >= pnCutOff ) |
---|
| 1305 | { |
---|
| 1306 | npnb = Poisson((1.5+1.25*numberofFinalStateNucleons)*epnb/(epnb+edta)); |
---|
| 1307 | if( numberofFinalStateNucleons + npnb > atomicWeight ) |
---|
| 1308 | npnb = G4int(atomicWeight+0.00001 - numberofFinalStateNucleons); |
---|
| 1309 | npnb = std::min( npnb, 127-vecLen ); |
---|
| 1310 | } |
---|
| 1311 | if( edta >= dtaCutOff ) |
---|
| 1312 | { |
---|
| 1313 | ndta = Poisson( (1.5+1.25*numberofFinalStateNucleons)*edta/(epnb+edta) ); |
---|
| 1314 | ndta = std::min( ndta, 127-vecLen ); |
---|
| 1315 | } |
---|
| 1316 | if (npnb == 0 && ndta == 0) npnb = 1; |
---|
| 1317 | |
---|
| 1318 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1319 | |
---|
| 1320 | AddBlackTrackParticles(epnb, npnb, edta, ndta, sprob, kineticMinimum, |
---|
| 1321 | kineticFactor, modifiedOriginal, |
---|
| 1322 | PinNucleus, NinNucleus, targetNucleus, |
---|
| 1323 | vec, vecLen); |
---|
| 1324 | |
---|
| 1325 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1326 | } |
---|
| 1327 | //if( centerofmassEnergy <= (4.0+G4UniformRand()) ) |
---|
| 1328 | // MomentumCheck( modifiedOriginal, currentParticle, targetParticle, vec, vecLen ); |
---|
| 1329 | // |
---|
| 1330 | // calculate time delay for nuclear reactions |
---|
| 1331 | // |
---|
| 1332 | if( (atomicWeight >= 1.5) && (atomicWeight <= 230.0) && (ekOriginal <= 0.2) ) |
---|
| 1333 | currentParticle.SetTOF( 1.0-500.0*std::exp(-ekOriginal/0.04)*std::log(G4UniformRand()) ); |
---|
| 1334 | else |
---|
| 1335 | currentParticle.SetTOF( 1.0 ); |
---|
| 1336 | return true; |
---|
| 1337 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1338 | } |
---|
| 1339 | |
---|
| 1340 | void G4ReactionDynamics::SuppressChargedPions( |
---|
| 1341 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
| 1342 | G4int &vecLen, |
---|
| 1343 | const G4ReactionProduct &modifiedOriginal, |
---|
| 1344 | G4ReactionProduct ¤tParticle, |
---|
| 1345 | G4ReactionProduct &targetParticle, |
---|
| 1346 | const G4Nucleus &targetNucleus, |
---|
| 1347 | G4bool &incidentHasChanged, |
---|
| 1348 | G4bool &targetHasChanged ) |
---|
| 1349 | { |
---|
| 1350 | // this code was originally in the fortran code TWOCLU |
---|
| 1351 | // |
---|
| 1352 | // suppress charged pions, for various reasons |
---|
| 1353 | // |
---|
| 1354 | G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
---|
| 1355 | G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
---|
| 1356 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
---|
| 1357 | G4double cmEnergy = std::sqrt( mOriginal*mOriginal + targetMass*targetMass + |
---|
| 1358 | 2.0*targetMass*etOriginal ); |
---|
| 1359 | G4double eAvailable = cmEnergy - mOriginal - targetMass; |
---|
| 1360 | for (G4int i = 0; i < vecLen; i++) eAvailable -= vec[i]->GetMass()/GeV; |
---|
| 1361 | |
---|
| 1362 | const G4double atomicWeight = targetNucleus.GetN(); |
---|
| 1363 | const G4double atomicNumber = targetNucleus.GetZ(); |
---|
| 1364 | const G4double pOriginal = modifiedOriginal.GetTotalMomentum()/GeV; |
---|
| 1365 | |
---|
| 1366 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
---|
| 1367 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
---|
| 1368 | G4ParticleDefinition* aPiZero = G4PionZero::PionZero(); |
---|
| 1369 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
| 1370 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
| 1371 | G4double piMass = aPiPlus->GetPDGMass()/GeV; |
---|
| 1372 | G4double nucleonMass = aNeutron->GetPDGMass()/GeV; |
---|
| 1373 | |
---|
| 1374 | const G4bool antiTest = |
---|
| 1375 | modifiedOriginal.GetDefinition() != G4AntiProton::AntiProton() && |
---|
| 1376 | modifiedOriginal.GetDefinition() != G4AntiNeutron::AntiNeutron() && |
---|
| 1377 | modifiedOriginal.GetDefinition() != G4AntiLambda::AntiLambda() && |
---|
| 1378 | modifiedOriginal.GetDefinition() != G4AntiSigmaPlus::AntiSigmaPlus() && |
---|
| 1379 | modifiedOriginal.GetDefinition() != G4AntiSigmaMinus::AntiSigmaMinus() && |
---|
| 1380 | modifiedOriginal.GetDefinition() != G4AntiXiZero::AntiXiZero() && |
---|
| 1381 | modifiedOriginal.GetDefinition() != G4AntiXiMinus::AntiXiMinus() && |
---|
| 1382 | modifiedOriginal.GetDefinition() != G4AntiOmegaMinus::AntiOmegaMinus(); |
---|
| 1383 | |
---|
| 1384 | if( antiTest && ( |
---|
| 1385 | currentParticle.GetDefinition() == aPiPlus || |
---|
| 1386 | currentParticle.GetDefinition() == aPiZero || |
---|
| 1387 | currentParticle.GetDefinition() == aPiMinus ) && |
---|
| 1388 | ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) && |
---|
| 1389 | ( G4UniformRand() <= atomicWeight/300.0 ) ) |
---|
| 1390 | { |
---|
| 1391 | if (eAvailable > nucleonMass - piMass) { |
---|
| 1392 | if( G4UniformRand() > atomicNumber/atomicWeight ) |
---|
| 1393 | currentParticle.SetDefinitionAndUpdateE( aNeutron ); |
---|
| 1394 | else |
---|
| 1395 | currentParticle.SetDefinitionAndUpdateE( aProton ); |
---|
| 1396 | incidentHasChanged = true; |
---|
| 1397 | } |
---|
| 1398 | } |
---|
| 1399 | if( antiTest && ( |
---|
| 1400 | targetParticle.GetDefinition() == aPiPlus || |
---|
| 1401 | targetParticle.GetDefinition() == aPiZero || |
---|
| 1402 | targetParticle.GetDefinition() == aPiMinus ) && |
---|
| 1403 | ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) && |
---|
| 1404 | ( G4UniformRand() <= atomicWeight/300.0 ) ) |
---|
| 1405 | { |
---|
| 1406 | if (eAvailable > nucleonMass - piMass) { |
---|
| 1407 | if( G4UniformRand() > atomicNumber/atomicWeight ) |
---|
| 1408 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
---|
| 1409 | else |
---|
| 1410 | targetParticle.SetDefinitionAndUpdateE( aProton ); |
---|
| 1411 | targetHasChanged = true; |
---|
| 1412 | } |
---|
| 1413 | } |
---|
| 1414 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1415 | for( G4int i=0; i<vecLen; ++i ) |
---|
| 1416 | { |
---|
| 1417 | if( antiTest && ( |
---|
| 1418 | vec[i]->GetDefinition() == aPiPlus || |
---|
| 1419 | vec[i]->GetDefinition() == aPiZero || |
---|
| 1420 | vec[i]->GetDefinition() == aPiMinus ) && |
---|
| 1421 | ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) && |
---|
| 1422 | ( G4UniformRand() <= atomicWeight/300.0 ) ) |
---|
| 1423 | { |
---|
| 1424 | if (eAvailable > nucleonMass - piMass) { |
---|
| 1425 | if( G4UniformRand() > atomicNumber/atomicWeight ) |
---|
| 1426 | vec[i]->SetDefinitionAndUpdateE( aNeutron ); |
---|
| 1427 | else |
---|
| 1428 | vec[i]->SetDefinitionAndUpdateE( aProton ); |
---|
| 1429 | } |
---|
| 1430 | } |
---|
| 1431 | } |
---|
| 1432 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1433 | } |
---|
| 1434 | |
---|
| 1435 | G4bool G4ReactionDynamics::TwoCluster( |
---|
| 1436 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
| 1437 | G4int &vecLen, |
---|
| 1438 | G4ReactionProduct &modifiedOriginal, // Fermi motion & evap. effects included |
---|
| 1439 | const G4HadProjectile *originalIncident, // the original incident particle |
---|
| 1440 | G4ReactionProduct ¤tParticle, |
---|
| 1441 | G4ReactionProduct &targetParticle, |
---|
| 1442 | const G4DynamicParticle* originalTarget, |
---|
| 1443 | const G4Nucleus &targetNucleus, |
---|
| 1444 | G4bool &incidentHasChanged, |
---|
| 1445 | G4bool &targetHasChanged, |
---|
| 1446 | G4bool leadFlag, |
---|
| 1447 | G4ReactionProduct &leadingStrangeParticle ) |
---|
| 1448 | { |
---|
| 1449 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1450 | // derived from original FORTRAN code TWOCLU by H. Fesefeldt (11-Oct-1987) |
---|
| 1451 | // |
---|
| 1452 | // Generation of X- and PT- values for incident, target, and all secondary particles |
---|
| 1453 | // |
---|
| 1454 | // A simple two cluster model is used. |
---|
| 1455 | // This should be sufficient for low energy interactions. |
---|
| 1456 | // |
---|
| 1457 | |
---|
| 1458 | // + debugging |
---|
| 1459 | // raise(SIGSEGV); |
---|
| 1460 | // - debugging |
---|
| 1461 | |
---|
| 1462 | G4int i; |
---|
| 1463 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
| 1464 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
| 1465 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
---|
| 1466 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
---|
| 1467 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
---|
| 1468 | G4bool veryForward = false; |
---|
| 1469 | |
---|
| 1470 | const G4double protonMass = aProton->GetPDGMass()/MeV; |
---|
| 1471 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/GeV; |
---|
| 1472 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
---|
| 1473 | const G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
---|
| 1474 | const G4double pOriginal = modifiedOriginal.GetMomentum().mag()/GeV; |
---|
| 1475 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
---|
| 1476 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
---|
| 1477 | targetMass*targetMass + |
---|
| 1478 | 2.0*targetMass*etOriginal ); // GeV |
---|
| 1479 | G4double currentMass = currentParticle.GetMass()/GeV; |
---|
| 1480 | targetMass = targetParticle.GetMass()/GeV; |
---|
| 1481 | |
---|
| 1482 | if( currentMass == 0.0 && targetMass == 0.0 ) |
---|
| 1483 | { |
---|
| 1484 | G4double ek = currentParticle.GetKineticEnergy(); |
---|
| 1485 | G4ThreeVector m = currentParticle.GetMomentum(); |
---|
| 1486 | currentParticle = *vec[0]; |
---|
| 1487 | targetParticle = *vec[1]; |
---|
| 1488 | for( i=0; i<(vecLen-2); ++i )*vec[i] = *vec[i+2]; |
---|
| 1489 | if(vecLen<2) |
---|
| 1490 | { |
---|
| 1491 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
---|
| 1492 | vecLen = 0; |
---|
| 1493 | throw G4HadReentrentException(__FILE__, __LINE__, |
---|
| 1494 | "G4ReactionDynamics::TwoCluster: Negative number of particles"); |
---|
| 1495 | } |
---|
| 1496 | delete vec[vecLen-1]; |
---|
| 1497 | delete vec[vecLen-2]; |
---|
| 1498 | vecLen -= 2; |
---|
| 1499 | currentMass = currentParticle.GetMass()/GeV; |
---|
| 1500 | targetMass = targetParticle.GetMass()/GeV; |
---|
| 1501 | incidentHasChanged = true; |
---|
| 1502 | targetHasChanged = true; |
---|
| 1503 | currentParticle.SetKineticEnergy( ek ); |
---|
| 1504 | currentParticle.SetMomentum( m ); |
---|
| 1505 | veryForward = true; |
---|
| 1506 | } |
---|
| 1507 | |
---|
| 1508 | const G4double atomicWeight = targetNucleus.GetN(); |
---|
| 1509 | const G4double atomicNumber = targetNucleus.GetZ(); |
---|
| 1510 | // |
---|
| 1511 | // particles have been distributed in forward and backward hemispheres |
---|
| 1512 | // in center of mass system of the hadron nucleon interaction |
---|
| 1513 | // |
---|
| 1514 | // incident is always in forward hemisphere |
---|
| 1515 | G4int forwardCount = 1; // number of particles in forward hemisphere |
---|
| 1516 | currentParticle.SetSide( 1 ); |
---|
| 1517 | G4double forwardMass = currentParticle.GetMass()/GeV; |
---|
| 1518 | G4double cMass = forwardMass; |
---|
| 1519 | |
---|
| 1520 | // target is always in backward hemisphere |
---|
| 1521 | G4int backwardCount = 1; // number of particles in backward hemisphere |
---|
| 1522 | G4int backwardNucleonCount = 1; // number of nucleons in backward hemisphere |
---|
| 1523 | targetParticle.SetSide( -1 ); |
---|
| 1524 | G4double backwardMass = targetParticle.GetMass()/GeV; |
---|
| 1525 | G4double bMass = backwardMass; |
---|
| 1526 | |
---|
| 1527 | for( i=0; i<vecLen; ++i ) |
---|
| 1528 | { |
---|
| 1529 | if( vec[i]->GetSide() < 0 )vec[i]->SetSide( -1 ); // added by JLC, 2Jul97 |
---|
| 1530 | // to take care of the case where vec has been preprocessed by GenerateXandPt |
---|
| 1531 | // and some of them have been set to -2 or -3 |
---|
| 1532 | if( vec[i]->GetSide() == -1 ) |
---|
| 1533 | { |
---|
| 1534 | ++backwardCount; |
---|
| 1535 | backwardMass += vec[i]->GetMass()/GeV; |
---|
| 1536 | } |
---|
| 1537 | else |
---|
| 1538 | { |
---|
| 1539 | ++forwardCount; |
---|
| 1540 | forwardMass += vec[i]->GetMass()/GeV; |
---|
| 1541 | } |
---|
| 1542 | } |
---|
| 1543 | // |
---|
| 1544 | // nucleons and some pions from intranuclear cascade |
---|
| 1545 | // |
---|
| 1546 | G4double term1 = std::log(centerofmassEnergy*centerofmassEnergy); |
---|
| 1547 | if(term1 < 0) term1 = 0.0001; // making sure xtarg<0; |
---|
| 1548 | const G4double afc = 0.312 + 0.2 * std::log(term1); |
---|
| 1549 | G4double xtarg; |
---|
| 1550 | if( centerofmassEnergy < 2.0+G4UniformRand() ) // added +2 below, JLC 4Jul97 |
---|
| 1551 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2*backwardCount+vecLen+2)/2.0; |
---|
| 1552 | else |
---|
| 1553 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2*backwardCount); |
---|
| 1554 | if( xtarg <= 0.0 )xtarg = 0.01; |
---|
| 1555 | G4int nuclearExcitationCount = Poisson( xtarg ); |
---|
| 1556 | if(atomicWeight<1.0001) nuclearExcitationCount = 0; |
---|
| 1557 | G4int extraNucleonCount = 0; |
---|
| 1558 | G4double extraMass = 0.0; |
---|
| 1559 | G4double extraNucleonMass = 0.0; |
---|
| 1560 | if( nuclearExcitationCount > 0 ) |
---|
| 1561 | { |
---|
| 1562 | G4int momentumBin = std::min( 4, G4int(pOriginal/3.0) ); |
---|
| 1563 | const G4double nucsup[] = { 1.0, 0.8, 0.6, 0.5, 0.4 }; |
---|
| 1564 | // |
---|
| 1565 | // NOTE: in TWOCLU, these new particles were given negative codes |
---|
| 1566 | // here we use NewlyAdded = true instead |
---|
| 1567 | // |
---|
| 1568 | // G4ReactionProduct *pVec = new G4ReactionProduct [nuclearExcitationCount]; |
---|
| 1569 | for( i=0; i<nuclearExcitationCount; ++i ) |
---|
| 1570 | { |
---|
| 1571 | G4ReactionProduct* pVec = new G4ReactionProduct(); |
---|
| 1572 | if( G4UniformRand() < nucsup[momentumBin] ) // add proton or neutron |
---|
| 1573 | { |
---|
| 1574 | if( G4UniformRand() > 1.0-atomicNumber/atomicWeight ) |
---|
| 1575 | pVec->SetDefinition( aProton ); |
---|
| 1576 | else |
---|
| 1577 | pVec->SetDefinition( aNeutron ); |
---|
| 1578 | ++backwardNucleonCount; |
---|
| 1579 | ++extraNucleonCount; |
---|
| 1580 | extraNucleonMass += pVec->GetMass()/GeV; |
---|
| 1581 | } |
---|
| 1582 | else |
---|
| 1583 | { // add a pion |
---|
| 1584 | G4double ran = G4UniformRand(); |
---|
| 1585 | if( ran < 0.3181 ) |
---|
| 1586 | pVec->SetDefinition( aPiPlus ); |
---|
| 1587 | else if( ran < 0.6819 ) |
---|
| 1588 | pVec->SetDefinition( aPiZero ); |
---|
| 1589 | else |
---|
| 1590 | pVec->SetDefinition( aPiMinus ); |
---|
| 1591 | } |
---|
| 1592 | pVec->SetSide( -2 ); // backside particle |
---|
| 1593 | extraMass += pVec->GetMass()/GeV; |
---|
| 1594 | pVec->SetNewlyAdded( true ); |
---|
| 1595 | vec.SetElement( vecLen++, pVec ); |
---|
| 1596 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1597 | } |
---|
| 1598 | } |
---|
| 1599 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1600 | G4double forwardEnergy = (centerofmassEnergy-cMass-bMass)/2.0 +cMass - forwardMass; |
---|
| 1601 | G4double backwardEnergy = (centerofmassEnergy-cMass-bMass)/2.0 +bMass - backwardMass; |
---|
| 1602 | G4double eAvailable = centerofmassEnergy - (forwardMass+backwardMass); |
---|
| 1603 | G4bool secondaryDeleted; |
---|
| 1604 | G4double pMass; |
---|
| 1605 | |
---|
| 1606 | while( eAvailable <= 0.0 ) // must eliminate a particle |
---|
| 1607 | { |
---|
| 1608 | secondaryDeleted = false; |
---|
| 1609 | for( i=(vecLen-1); i>=0; --i ) |
---|
| 1610 | { |
---|
| 1611 | if( vec[i]->GetSide() == 1 && vec[i]->GetMayBeKilled()) |
---|
| 1612 | { |
---|
| 1613 | pMass = vec[i]->GetMass()/GeV; |
---|
| 1614 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
| 1615 | --forwardCount; |
---|
| 1616 | forwardEnergy += pMass; |
---|
| 1617 | forwardMass -= pMass; |
---|
| 1618 | secondaryDeleted = true; |
---|
| 1619 | break; |
---|
| 1620 | } |
---|
| 1621 | else if( vec[i]->GetSide() == -1 && vec[i]->GetMayBeKilled()) |
---|
| 1622 | { |
---|
| 1623 | pMass = vec[i]->GetMass()/GeV; |
---|
| 1624 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
| 1625 | --backwardCount; |
---|
| 1626 | backwardEnergy += pMass; |
---|
| 1627 | backwardMass -= pMass; |
---|
| 1628 | secondaryDeleted = true; |
---|
| 1629 | break; |
---|
| 1630 | } |
---|
| 1631 | } // breaks go down to here |
---|
| 1632 | if( secondaryDeleted ) |
---|
| 1633 | { |
---|
| 1634 | delete vec[vecLen-1]; |
---|
| 1635 | --vecLen; |
---|
| 1636 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1637 | } |
---|
| 1638 | else |
---|
| 1639 | { |
---|
| 1640 | if( vecLen == 0 ) |
---|
| 1641 | { |
---|
| 1642 | return false; // all secondaries have been eliminated |
---|
| 1643 | } |
---|
| 1644 | if( targetParticle.GetSide() == -1 ) |
---|
| 1645 | { |
---|
| 1646 | pMass = targetParticle.GetMass()/GeV; |
---|
| 1647 | targetParticle = *vec[0]; |
---|
| 1648 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
| 1649 | --backwardCount; |
---|
| 1650 | backwardEnergy += pMass; |
---|
| 1651 | backwardMass -= pMass; |
---|
| 1652 | secondaryDeleted = true; |
---|
| 1653 | } |
---|
| 1654 | else if( targetParticle.GetSide() == 1 ) |
---|
| 1655 | { |
---|
| 1656 | pMass = targetParticle.GetMass()/GeV; |
---|
| 1657 | targetParticle = *vec[0]; |
---|
| 1658 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
| 1659 | --forwardCount; |
---|
| 1660 | forwardEnergy += pMass; |
---|
| 1661 | forwardMass -= pMass; |
---|
| 1662 | secondaryDeleted = true; |
---|
| 1663 | } |
---|
| 1664 | if( secondaryDeleted ) |
---|
| 1665 | { |
---|
| 1666 | delete vec[vecLen-1]; |
---|
| 1667 | --vecLen; |
---|
| 1668 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1669 | } |
---|
| 1670 | else |
---|
| 1671 | { |
---|
| 1672 | if( currentParticle.GetSide() == -1 ) |
---|
| 1673 | { |
---|
| 1674 | pMass = currentParticle.GetMass()/GeV; |
---|
| 1675 | currentParticle = *vec[0]; |
---|
| 1676 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
| 1677 | --backwardCount; |
---|
| 1678 | backwardEnergy += pMass; |
---|
| 1679 | backwardMass -= pMass; |
---|
| 1680 | secondaryDeleted = true; |
---|
| 1681 | } |
---|
| 1682 | else if( currentParticle.GetSide() == 1 ) |
---|
| 1683 | { |
---|
| 1684 | pMass = currentParticle.GetMass()/GeV; |
---|
| 1685 | currentParticle = *vec[0]; |
---|
| 1686 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
| 1687 | --forwardCount; |
---|
| 1688 | forwardEnergy += pMass; |
---|
| 1689 | forwardMass -= pMass; |
---|
| 1690 | secondaryDeleted = true; |
---|
| 1691 | } |
---|
| 1692 | if( secondaryDeleted ) |
---|
| 1693 | { |
---|
| 1694 | delete vec[vecLen-1]; |
---|
| 1695 | --vecLen; |
---|
| 1696 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1697 | } |
---|
| 1698 | else break; |
---|
| 1699 | } |
---|
| 1700 | } |
---|
| 1701 | eAvailable = centerofmassEnergy - (forwardMass+backwardMass); |
---|
| 1702 | } |
---|
| 1703 | // |
---|
| 1704 | // This is the start of the TwoCluster function |
---|
| 1705 | // Choose masses for the 3 clusters: |
---|
| 1706 | // forward cluster |
---|
| 1707 | // backward meson cluster |
---|
| 1708 | // backward nucleon cluster |
---|
| 1709 | // |
---|
| 1710 | G4double rmc = 0.0, rmd = 0.0; |
---|
| 1711 | const G4double cpar[] = { 0.6, 0.6, 0.35, 0.15, 0.10 }; |
---|
| 1712 | const G4double gpar[] = { 2.6, 2.6, 1.8, 1.30, 1.20 }; |
---|
| 1713 | |
---|
| 1714 | if (forwardCount <= 0 || backwardCount <= 0) return false; // array bounds protection |
---|
| 1715 | |
---|
| 1716 | if (forwardCount == 1) rmc = forwardMass; |
---|
| 1717 | else |
---|
| 1718 | { |
---|
| 1719 | G4int ntc = std::max(1, std::min(5,forwardCount))-1; // check if offset by 1 @@ |
---|
| 1720 | rmc = forwardMass + std::pow(-std::log(1.0-G4UniformRand()),cpar[ntc-1])/gpar[ntc-1]; |
---|
| 1721 | } |
---|
| 1722 | |
---|
| 1723 | if (backwardCount == 1) rmd = backwardMass; |
---|
| 1724 | else |
---|
| 1725 | { |
---|
| 1726 | G4int ntc = std::max(1, std::min(5,backwardCount)); // check, if offfset by 1 @@ |
---|
| 1727 | rmd = backwardMass + std::pow(-std::log(1.0-G4UniformRand()),cpar[ntc-1])/gpar[ntc-1]; |
---|
| 1728 | } |
---|
| 1729 | |
---|
| 1730 | while( rmc+rmd > centerofmassEnergy ) |
---|
| 1731 | { |
---|
| 1732 | if( (rmc <= forwardMass) && (rmd <= backwardMass) ) |
---|
| 1733 | { |
---|
| 1734 | G4double temp = 0.999*centerofmassEnergy/(rmc+rmd); |
---|
| 1735 | rmc *= temp; |
---|
| 1736 | rmd *= temp; |
---|
| 1737 | } |
---|
| 1738 | else |
---|
| 1739 | { |
---|
| 1740 | rmc = 0.1*forwardMass + 0.9*rmc; |
---|
| 1741 | rmd = 0.1*backwardMass + 0.9*rmd; |
---|
| 1742 | } |
---|
| 1743 | } |
---|
| 1744 | |
---|
| 1745 | G4ReactionProduct pseudoParticle[8]; |
---|
| 1746 | for( i=0; i<8; ++i )pseudoParticle[i].SetZero(); |
---|
| 1747 | |
---|
| 1748 | pseudoParticle[1].SetMass( mOriginal*GeV ); |
---|
| 1749 | pseudoParticle[1].SetTotalEnergy( etOriginal*GeV ); |
---|
| 1750 | pseudoParticle[1].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
| 1751 | |
---|
| 1752 | pseudoParticle[2].SetMass( protonMass*MeV ); |
---|
| 1753 | pseudoParticle[2].SetTotalEnergy( protonMass*MeV ); |
---|
| 1754 | pseudoParticle[2].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 1755 | // |
---|
| 1756 | // transform into centre of mass system |
---|
| 1757 | // |
---|
| 1758 | pseudoParticle[0] = pseudoParticle[1] + pseudoParticle[2]; |
---|
| 1759 | pseudoParticle[1].Lorentz( pseudoParticle[1], pseudoParticle[0] ); |
---|
| 1760 | pseudoParticle[2].Lorentz( pseudoParticle[2], pseudoParticle[0] ); |
---|
| 1761 | |
---|
| 1762 | const G4double pfMin = 0.0001; |
---|
| 1763 | G4double pf = (centerofmassEnergy*centerofmassEnergy+rmd*rmd-rmc*rmc); |
---|
| 1764 | pf *= pf; |
---|
| 1765 | pf -= 4*centerofmassEnergy*centerofmassEnergy*rmd*rmd; |
---|
| 1766 | pf = std::sqrt( std::max(pf,pfMin) )/(2.0*centerofmassEnergy); |
---|
| 1767 | // |
---|
| 1768 | // set final state masses and energies in centre of mass system |
---|
| 1769 | // |
---|
| 1770 | pseudoParticle[3].SetMass( rmc*GeV ); |
---|
| 1771 | pseudoParticle[3].SetTotalEnergy( std::sqrt(pf*pf+rmc*rmc)*GeV ); |
---|
| 1772 | |
---|
| 1773 | pseudoParticle[4].SetMass( rmd*GeV ); |
---|
| 1774 | pseudoParticle[4].SetTotalEnergy( std::sqrt(pf*pf+rmd*rmd)*GeV ); |
---|
| 1775 | // |
---|
| 1776 | // set |T| and |TMIN| |
---|
| 1777 | // |
---|
| 1778 | const G4double bMin = 0.01; |
---|
| 1779 | const G4double b1 = 4.0; |
---|
| 1780 | const G4double b2 = 1.6; |
---|
| 1781 | |
---|
| 1782 | G4double pin = pseudoParticle[1].GetMomentum().mag()/GeV; |
---|
| 1783 | G4double dtb = 4.0*pin*pf*std::max( bMin, b1+b2*std::log(pOriginal) ); |
---|
| 1784 | G4double factor = 1.0 - std::exp(-dtb); |
---|
| 1785 | G4double costheta = 1.0 + 2.0*std::log(1.0 - G4UniformRand()*factor) / dtb; |
---|
| 1786 | costheta = std::max(-1.0, std::min(1.0, costheta)); |
---|
| 1787 | G4double sintheta = std::sqrt(1.0-costheta*costheta); |
---|
| 1788 | G4double phi = G4UniformRand() * twopi; |
---|
| 1789 | |
---|
| 1790 | // |
---|
| 1791 | // calculate final state momenta in centre of mass system |
---|
| 1792 | // |
---|
| 1793 | pseudoParticle[3].SetMomentum( pf*sintheta*std::cos(phi)*GeV, |
---|
| 1794 | pf*sintheta*std::sin(phi)*GeV, |
---|
| 1795 | pf*costheta*GeV ); |
---|
| 1796 | |
---|
| 1797 | pseudoParticle[4].SetMomentum( pseudoParticle[3].GetMomentum() * (-1.0) ); |
---|
| 1798 | // |
---|
| 1799 | // simulate backward nucleon cluster in lab. system and transform in cms |
---|
| 1800 | // |
---|
| 1801 | G4double pp, pp1; |
---|
| 1802 | if( nuclearExcitationCount > 0 ) |
---|
| 1803 | { |
---|
| 1804 | const G4double ga = 1.2; |
---|
| 1805 | G4double ekit1 = 0.04; |
---|
| 1806 | G4double ekit2 = 0.6; |
---|
| 1807 | if( ekOriginal <= 5.0 ) |
---|
| 1808 | { |
---|
| 1809 | ekit1 *= ekOriginal*ekOriginal/25.0; |
---|
| 1810 | ekit2 *= ekOriginal*ekOriginal/25.0; |
---|
| 1811 | } |
---|
| 1812 | const G4double a = (1.0-ga)/(std::pow(ekit2,(1.0-ga)) - std::pow(ekit1,(1.0-ga))); |
---|
| 1813 | for( i=0; i<vecLen; ++i ) |
---|
| 1814 | { |
---|
| 1815 | if( vec[i]->GetSide() == -2 ) |
---|
| 1816 | { |
---|
| 1817 | G4double kineticE = |
---|
| 1818 | std::pow( (G4UniformRand()*(1.0-ga)/a+std::pow(ekit1,(1.0-ga))), (1.0/(1.0-ga)) ); |
---|
| 1819 | vec[i]->SetKineticEnergy( kineticE*GeV ); |
---|
| 1820 | G4double vMass = vec[i]->GetMass()/MeV; |
---|
| 1821 | G4double totalE = kineticE*GeV + vMass; |
---|
| 1822 | pp = std::sqrt( std::abs(totalE*totalE-vMass*vMass) ); |
---|
| 1823 | G4double cost = std::min( 1.0, std::max( -1.0, std::log(2.23*G4UniformRand()+0.383)/0.96 ) ); |
---|
| 1824 | G4double sint = std::sqrt( std::max( 0.0, (1.0-cost*cost) ) ); |
---|
| 1825 | phi = twopi*G4UniformRand(); |
---|
| 1826 | vec[i]->SetMomentum( pp*sint*std::sin(phi)*MeV, |
---|
| 1827 | pp*sint*std::cos(phi)*MeV, |
---|
| 1828 | pp*cost*MeV ); |
---|
| 1829 | vec[i]->Lorentz( *vec[i], pseudoParticle[0] ); |
---|
| 1830 | } |
---|
| 1831 | } |
---|
| 1832 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1833 | } |
---|
| 1834 | // |
---|
| 1835 | // fragmentation of forward cluster and backward meson cluster |
---|
| 1836 | // |
---|
| 1837 | currentParticle.SetMomentum( pseudoParticle[3].GetMomentum() ); |
---|
| 1838 | currentParticle.SetTotalEnergy( pseudoParticle[3].GetTotalEnergy() ); |
---|
| 1839 | |
---|
| 1840 | targetParticle.SetMomentum( pseudoParticle[4].GetMomentum() ); |
---|
| 1841 | targetParticle.SetTotalEnergy( pseudoParticle[4].GetTotalEnergy() ); |
---|
| 1842 | |
---|
| 1843 | pseudoParticle[5].SetMomentum( pseudoParticle[3].GetMomentum() * (-1.0) ); |
---|
| 1844 | pseudoParticle[5].SetMass( pseudoParticle[3].GetMass() ); |
---|
| 1845 | pseudoParticle[5].SetTotalEnergy( pseudoParticle[3].GetTotalEnergy() ); |
---|
| 1846 | |
---|
| 1847 | pseudoParticle[6].SetMomentum( pseudoParticle[4].GetMomentum() * (-1.0) ); |
---|
| 1848 | pseudoParticle[6].SetMass( pseudoParticle[4].GetMass() ); |
---|
| 1849 | pseudoParticle[6].SetTotalEnergy( pseudoParticle[4].GetTotalEnergy() ); |
---|
| 1850 | |
---|
| 1851 | G4double wgt; |
---|
| 1852 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1853 | if( forwardCount > 1 ) // tempV will contain the forward particles |
---|
| 1854 | { |
---|
| 1855 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; |
---|
| 1856 | tempV.Initialize( forwardCount ); |
---|
| 1857 | G4bool constantCrossSection = true; |
---|
| 1858 | G4int tempLen = 0; |
---|
| 1859 | if( currentParticle.GetSide() == 1 ) |
---|
| 1860 | tempV.SetElement( tempLen++, ¤tParticle ); |
---|
| 1861 | if( targetParticle.GetSide() == 1 ) |
---|
| 1862 | tempV.SetElement( tempLen++, &targetParticle ); |
---|
| 1863 | for( i=0; i<vecLen; ++i ) |
---|
| 1864 | { |
---|
| 1865 | if( vec[i]->GetSide() == 1 ) |
---|
| 1866 | { |
---|
| 1867 | if( tempLen < 18 ) |
---|
| 1868 | tempV.SetElement( tempLen++, vec[i] ); |
---|
| 1869 | else |
---|
| 1870 | { |
---|
| 1871 | vec[i]->SetSide( -1 ); |
---|
| 1872 | continue; |
---|
| 1873 | } |
---|
| 1874 | } |
---|
| 1875 | } |
---|
| 1876 | if( tempLen >= 2 ) |
---|
| 1877 | { |
---|
| 1878 | wgt = GenerateNBodyEvent( pseudoParticle[3].GetMass()/MeV, |
---|
| 1879 | constantCrossSection, tempV, tempLen ); |
---|
| 1880 | if( currentParticle.GetSide() == 1 ) |
---|
| 1881 | currentParticle.Lorentz( currentParticle, pseudoParticle[5] ); |
---|
| 1882 | if( targetParticle.GetSide() == 1 ) |
---|
| 1883 | targetParticle.Lorentz( targetParticle, pseudoParticle[5] ); |
---|
| 1884 | for( i=0; i<vecLen; ++i ) |
---|
| 1885 | { |
---|
| 1886 | if( vec[i]->GetSide() == 1 )vec[i]->Lorentz( *vec[i], pseudoParticle[5] ); |
---|
| 1887 | } |
---|
| 1888 | } |
---|
| 1889 | } |
---|
| 1890 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1891 | if( backwardCount > 1 ) // tempV will contain the backward particles, |
---|
| 1892 | { // but not those created from the intranuclear cascade |
---|
| 1893 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; |
---|
| 1894 | tempV.Initialize( backwardCount ); |
---|
| 1895 | G4bool constantCrossSection = true; |
---|
| 1896 | G4int tempLen = 0; |
---|
| 1897 | if( currentParticle.GetSide() == -1 ) |
---|
| 1898 | tempV.SetElement( tempLen++, ¤tParticle ); |
---|
| 1899 | if( targetParticle.GetSide() == -1 ) |
---|
| 1900 | tempV.SetElement( tempLen++, &targetParticle ); |
---|
| 1901 | for( i=0; i<vecLen; ++i ) |
---|
| 1902 | { |
---|
| 1903 | if( vec[i]->GetSide() == -1 ) |
---|
| 1904 | { |
---|
| 1905 | if( tempLen < 18 ) |
---|
| 1906 | tempV.SetElement( tempLen++, vec[i] ); |
---|
| 1907 | else |
---|
| 1908 | { |
---|
| 1909 | vec[i]->SetSide( -2 ); |
---|
| 1910 | vec[i]->SetKineticEnergy( 0.0 ); |
---|
| 1911 | vec[i]->SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 1912 | continue; |
---|
| 1913 | } |
---|
| 1914 | } |
---|
| 1915 | } |
---|
| 1916 | if( tempLen >= 2 ) |
---|
| 1917 | { |
---|
| 1918 | wgt = GenerateNBodyEvent( pseudoParticle[4].GetMass()/MeV, |
---|
| 1919 | constantCrossSection, tempV, tempLen ); |
---|
| 1920 | if( currentParticle.GetSide() == -1 ) |
---|
| 1921 | currentParticle.Lorentz( currentParticle, pseudoParticle[6] ); |
---|
| 1922 | if( targetParticle.GetSide() == -1 ) |
---|
| 1923 | targetParticle.Lorentz( targetParticle, pseudoParticle[6] ); |
---|
| 1924 | for( i=0; i<vecLen; ++i ) |
---|
| 1925 | { |
---|
| 1926 | if( vec[i]->GetSide() == -1 )vec[i]->Lorentz( *vec[i], pseudoParticle[6] ); |
---|
| 1927 | } |
---|
| 1928 | } |
---|
| 1929 | } |
---|
| 1930 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1931 | // |
---|
| 1932 | // Lorentz transformation in lab system |
---|
| 1933 | // |
---|
| 1934 | currentParticle.Lorentz( currentParticle, pseudoParticle[2] ); |
---|
| 1935 | targetParticle.Lorentz( targetParticle, pseudoParticle[2] ); |
---|
| 1936 | for( i=0; i<vecLen; ++i ) vec[i]->Lorentz( *vec[i], pseudoParticle[2] ); |
---|
| 1937 | |
---|
| 1938 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1939 | // |
---|
| 1940 | // sometimes the leading strange particle is lost, set it back |
---|
| 1941 | // |
---|
| 1942 | G4bool dum = true; |
---|
| 1943 | if( leadFlag ) |
---|
| 1944 | { |
---|
| 1945 | // leadFlag will be true |
---|
| 1946 | // iff original particle is at least as heavy as K+ and not a proton or |
---|
| 1947 | // neutron AND if incident particle is at least as heavy as K+ and it is |
---|
| 1948 | // not a proton or neutron leadFlag is set to the incident particle |
---|
| 1949 | // or |
---|
| 1950 | // target particle is at least as heavy as K+ and it is not a proton or |
---|
| 1951 | // neutron leadFlag is set to the target particle |
---|
| 1952 | // |
---|
| 1953 | if( currentParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
| 1954 | dum = false; |
---|
| 1955 | else if( targetParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
| 1956 | dum = false; |
---|
| 1957 | else |
---|
| 1958 | { |
---|
| 1959 | for( i=0; i<vecLen; ++i ) |
---|
| 1960 | { |
---|
| 1961 | if( vec[i]->GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
| 1962 | { |
---|
| 1963 | dum = false; |
---|
| 1964 | break; |
---|
| 1965 | } |
---|
| 1966 | } |
---|
| 1967 | } |
---|
| 1968 | if( dum ) |
---|
| 1969 | { |
---|
| 1970 | G4double leadMass = leadingStrangeParticle.GetMass()/MeV; |
---|
| 1971 | G4double ekin; |
---|
| 1972 | if( ((leadMass < protonMass) && (targetParticle.GetMass()/MeV < protonMass)) || |
---|
| 1973 | ((leadMass >= protonMass) && (targetParticle.GetMass()/MeV >= protonMass)) ) |
---|
| 1974 | { |
---|
| 1975 | ekin = targetParticle.GetKineticEnergy()/GeV; |
---|
| 1976 | pp1 = targetParticle.GetMomentum().mag()/MeV; // old momentum |
---|
| 1977 | targetParticle.SetDefinition( leadingStrangeParticle.GetDefinition() ); |
---|
| 1978 | targetParticle.SetKineticEnergy( ekin*GeV ); |
---|
| 1979 | pp = targetParticle.GetTotalMomentum()/MeV; // new momentum |
---|
| 1980 | if( pp1 < 1.0e-3 ) |
---|
| 1981 | { |
---|
| 1982 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 1983 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 1984 | G4double phi = twopi*G4UniformRand(); |
---|
| 1985 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 1986 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 1987 | pp*costheta*MeV ) ; |
---|
| 1988 | } |
---|
| 1989 | else |
---|
| 1990 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 1991 | |
---|
| 1992 | targetHasChanged = true; |
---|
| 1993 | } |
---|
| 1994 | else |
---|
| 1995 | { |
---|
| 1996 | ekin = currentParticle.GetKineticEnergy()/GeV; |
---|
| 1997 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 1998 | currentParticle.SetDefinition( leadingStrangeParticle.GetDefinition() ); |
---|
| 1999 | currentParticle.SetKineticEnergy( ekin*GeV ); |
---|
| 2000 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
| 2001 | if( pp1 < 1.0e-3 ) |
---|
| 2002 | { |
---|
| 2003 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 2004 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 2005 | G4double phi = twopi*G4UniformRand(); |
---|
| 2006 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 2007 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 2008 | pp*costheta*MeV ) ; |
---|
| 2009 | } |
---|
| 2010 | else |
---|
| 2011 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 2012 | |
---|
| 2013 | incidentHasChanged = true; |
---|
| 2014 | } |
---|
| 2015 | } |
---|
| 2016 | } // end of if( leadFlag ) |
---|
| 2017 | |
---|
| 2018 | // Get number of final state nucleons and nucleons remaining in |
---|
| 2019 | // target nucleus |
---|
| 2020 | |
---|
| 2021 | std::pair<G4int, G4int> finalStateNucleons = |
---|
| 2022 | GetFinalStateNucleons(originalTarget, vec, vecLen); |
---|
| 2023 | |
---|
| 2024 | G4int protonsInFinalState = finalStateNucleons.first; |
---|
| 2025 | G4int neutronsInFinalState = finalStateNucleons.second; |
---|
| 2026 | |
---|
| 2027 | G4int numberofFinalStateNucleons = |
---|
| 2028 | protonsInFinalState + neutronsInFinalState; |
---|
| 2029 | |
---|
| 2030 | if (currentParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
| 2031 | targetParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
| 2032 | originalIncident->GetDefinition()->GetPDGMass() < |
---|
| 2033 | G4Lambda::Lambda()->GetPDGMass()) |
---|
| 2034 | numberofFinalStateNucleons++; |
---|
| 2035 | |
---|
| 2036 | numberofFinalStateNucleons = std::max(1, numberofFinalStateNucleons); |
---|
| 2037 | |
---|
| 2038 | G4int PinNucleus = std::max(0, |
---|
| 2039 | G4int(targetNucleus.GetZ()) - protonsInFinalState); |
---|
| 2040 | G4int NinNucleus = std::max(0, |
---|
| 2041 | G4int(targetNucleus.GetN()-targetNucleus.GetZ()) - neutronsInFinalState); |
---|
| 2042 | // |
---|
| 2043 | // for various reasons, the energy balance is not sufficient, |
---|
| 2044 | // check that, energy balance, angle of final system, etc. |
---|
| 2045 | // |
---|
| 2046 | pseudoParticle[4].SetMass( mOriginal*GeV ); |
---|
| 2047 | pseudoParticle[4].SetTotalEnergy( etOriginal*GeV ); |
---|
| 2048 | pseudoParticle[4].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
| 2049 | |
---|
| 2050 | G4ParticleDefinition * aOrgDef = modifiedOriginal.GetDefinition(); |
---|
| 2051 | G4int diff = 0; |
---|
| 2052 | if(aOrgDef == G4Proton::Proton() || aOrgDef == G4Neutron::Neutron() ) diff = 1; |
---|
| 2053 | if(numberofFinalStateNucleons == 1) diff = 0; |
---|
| 2054 | pseudoParticle[5].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 2055 | pseudoParticle[5].SetMass( protonMass*(numberofFinalStateNucleons-diff)*MeV); |
---|
| 2056 | pseudoParticle[5].SetTotalEnergy( protonMass*(numberofFinalStateNucleons-diff)*MeV); |
---|
| 2057 | |
---|
| 2058 | G4double theoreticalKinetic = |
---|
| 2059 | pseudoParticle[4].GetTotalEnergy()/GeV + pseudoParticle[5].GetTotalEnergy()/GeV; |
---|
| 2060 | |
---|
| 2061 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
| 2062 | pseudoParticle[4].Lorentz( pseudoParticle[4], pseudoParticle[6] ); |
---|
| 2063 | pseudoParticle[5].Lorentz( pseudoParticle[5], pseudoParticle[6] ); |
---|
| 2064 | |
---|
| 2065 | if( vecLen < 16 ) |
---|
| 2066 | { |
---|
| 2067 | G4ReactionProduct tempR[130]; |
---|
| 2068 | tempR[0] = currentParticle; |
---|
| 2069 | tempR[1] = targetParticle; |
---|
| 2070 | for( i=0; i<vecLen; ++i )tempR[i+2] = *vec[i]; |
---|
| 2071 | |
---|
| 2072 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; |
---|
| 2073 | tempV.Initialize( vecLen+2 ); |
---|
| 2074 | G4bool constantCrossSection = true; |
---|
| 2075 | G4int tempLen = 0; |
---|
| 2076 | for( i=0; i<vecLen+2; ++i )tempV.SetElement( tempLen++, &tempR[i] ); |
---|
| 2077 | |
---|
| 2078 | if( tempLen >= 2 ) |
---|
| 2079 | { |
---|
| 2080 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2081 | wgt = GenerateNBodyEvent( pseudoParticle[4].GetTotalEnergy()/MeV + |
---|
| 2082 | pseudoParticle[5].GetTotalEnergy()/MeV, |
---|
| 2083 | constantCrossSection, tempV, tempLen ); |
---|
| 2084 | if (wgt == -1) { |
---|
| 2085 | G4double Qvalue = 0; |
---|
| 2086 | for (i = 0; i < tempLen; i++) Qvalue += tempV[i]->GetMass(); |
---|
| 2087 | wgt = GenerateNBodyEvent( Qvalue/MeV, |
---|
| 2088 | constantCrossSection, tempV, tempLen ); |
---|
| 2089 | } |
---|
| 2090 | theoreticalKinetic = 0.0; |
---|
| 2091 | for( i=0; i<vecLen+2; ++i ) |
---|
| 2092 | { |
---|
| 2093 | pseudoParticle[7].SetMomentum( tempV[i]->GetMomentum() ); |
---|
| 2094 | pseudoParticle[7].SetMass( tempV[i]->GetMass() ); |
---|
| 2095 | pseudoParticle[7].SetTotalEnergy( tempV[i]->GetTotalEnergy() ); |
---|
| 2096 | pseudoParticle[7].Lorentz( pseudoParticle[7], pseudoParticle[5] ); |
---|
| 2097 | theoreticalKinetic += pseudoParticle[7].GetKineticEnergy()/GeV; |
---|
| 2098 | } |
---|
| 2099 | } |
---|
| 2100 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2101 | } |
---|
| 2102 | else |
---|
| 2103 | { |
---|
| 2104 | theoreticalKinetic -= |
---|
| 2105 | ( currentParticle.GetMass()/GeV + targetParticle.GetMass()/GeV ); |
---|
| 2106 | for( i=0; i<vecLen; ++i )theoreticalKinetic -= vec[i]->GetMass()/GeV; |
---|
| 2107 | } |
---|
| 2108 | G4double simulatedKinetic = |
---|
| 2109 | currentParticle.GetKineticEnergy()/GeV + targetParticle.GetKineticEnergy()/GeV; |
---|
| 2110 | for( i=0; i<vecLen; ++i )simulatedKinetic += vec[i]->GetKineticEnergy()/GeV; |
---|
| 2111 | // |
---|
| 2112 | // make sure that kinetic energies are correct |
---|
| 2113 | // the backward nucleon cluster is not produced within proper kinematics!!! |
---|
| 2114 | // |
---|
| 2115 | |
---|
| 2116 | if( simulatedKinetic != 0.0 ) |
---|
| 2117 | { |
---|
| 2118 | wgt = (theoreticalKinetic)/simulatedKinetic; |
---|
| 2119 | currentParticle.SetKineticEnergy( wgt*currentParticle.GetKineticEnergy() ); |
---|
| 2120 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
| 2121 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 2122 | if( pp1 < 0.001*MeV ) |
---|
| 2123 | { |
---|
| 2124 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 2125 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 2126 | G4double phi = twopi*G4UniformRand(); |
---|
| 2127 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 2128 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 2129 | pp*costheta*MeV ) ; |
---|
| 2130 | } |
---|
| 2131 | else |
---|
| 2132 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 2133 | |
---|
| 2134 | targetParticle.SetKineticEnergy( wgt*targetParticle.GetKineticEnergy() ); |
---|
| 2135 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
| 2136 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
| 2137 | if( pp1 < 0.001*MeV ) |
---|
| 2138 | { |
---|
| 2139 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 2140 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 2141 | G4double phi = twopi*G4UniformRand(); |
---|
| 2142 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 2143 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 2144 | pp*costheta*MeV ) ; |
---|
| 2145 | } |
---|
| 2146 | else |
---|
| 2147 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 2148 | |
---|
| 2149 | for( i=0; i<vecLen; ++i ) |
---|
| 2150 | { |
---|
| 2151 | vec[i]->SetKineticEnergy( wgt*vec[i]->GetKineticEnergy() ); |
---|
| 2152 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
| 2153 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
| 2154 | if( pp1 < 0.001 ) |
---|
| 2155 | { |
---|
| 2156 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 2157 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 2158 | G4double phi = twopi*G4UniformRand(); |
---|
| 2159 | vec[i]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 2160 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 2161 | pp*costheta*MeV ) ; |
---|
| 2162 | } |
---|
| 2163 | else |
---|
| 2164 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
| 2165 | } |
---|
| 2166 | } |
---|
| 2167 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2168 | |
---|
| 2169 | Rotate( numberofFinalStateNucleons, pseudoParticle[4].GetMomentum(), |
---|
| 2170 | modifiedOriginal, originalIncident, targetNucleus, |
---|
| 2171 | currentParticle, targetParticle, vec, vecLen ); |
---|
| 2172 | // |
---|
| 2173 | // add black track particles |
---|
| 2174 | // the total number of particles produced is restricted to 198 |
---|
| 2175 | // this may have influence on very high energies |
---|
| 2176 | // |
---|
| 2177 | if( atomicWeight >= 1.5 ) |
---|
| 2178 | { |
---|
| 2179 | // npnb is number of proton/neutron black track particles |
---|
| 2180 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
| 2181 | // epnb is the kinetic energy available for proton/neutron black track |
---|
| 2182 | // particles |
---|
| 2183 | // edta is the kinetic energy available for deuteron/triton/alpha |
---|
| 2184 | // particles |
---|
| 2185 | |
---|
| 2186 | G4int npnb = 0; |
---|
| 2187 | G4int ndta = 0; |
---|
| 2188 | |
---|
| 2189 | G4double epnb, edta; |
---|
| 2190 | if (veryForward) { |
---|
| 2191 | epnb = targetNucleus.GetAnnihilationPNBlackTrackEnergy(); |
---|
| 2192 | edta = targetNucleus.GetAnnihilationDTABlackTrackEnergy(); |
---|
| 2193 | } else { |
---|
| 2194 | epnb = targetNucleus.GetPNBlackTrackEnergy(); |
---|
| 2195 | edta = targetNucleus.GetDTABlackTrackEnergy(); |
---|
| 2196 | } |
---|
| 2197 | |
---|
| 2198 | const G4double pnCutOff = 0.001; // GeV |
---|
| 2199 | const G4double dtaCutOff = 0.001; // GeV |
---|
| 2200 | const G4double kineticMinimum = 1.e-6; |
---|
| 2201 | const G4double kineticFactor = -0.005; |
---|
| 2202 | |
---|
| 2203 | G4double sprob = 0.0; // sprob = probability of self-absorption in |
---|
| 2204 | // heavy molecules |
---|
| 2205 | const G4double ekIncident = originalIncident->GetKineticEnergy()/GeV; |
---|
| 2206 | if( ekIncident >= 5.0 )sprob = std::min( 1.0, 0.6*std::log(ekIncident-4.0) ); |
---|
| 2207 | |
---|
| 2208 | if( epnb >= pnCutOff ) |
---|
| 2209 | { |
---|
| 2210 | npnb = Poisson((1.5+1.25*numberofFinalStateNucleons)*epnb/(epnb+edta)); |
---|
| 2211 | if( numberofFinalStateNucleons + npnb > atomicWeight ) |
---|
| 2212 | npnb = G4int(atomicWeight - numberofFinalStateNucleons); |
---|
| 2213 | npnb = std::min( npnb, 127-vecLen ); |
---|
| 2214 | } |
---|
| 2215 | if( edta >= dtaCutOff ) |
---|
| 2216 | { |
---|
| 2217 | ndta = Poisson( (1.5+1.25*numberofFinalStateNucleons)*edta/(epnb+edta) ); |
---|
| 2218 | ndta = std::min( ndta, 127-vecLen ); |
---|
| 2219 | } |
---|
| 2220 | if (npnb == 0 && ndta == 0) npnb = 1; |
---|
| 2221 | |
---|
| 2222 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2223 | |
---|
| 2224 | AddBlackTrackParticles(epnb, npnb, edta, ndta, sprob, kineticMinimum, |
---|
| 2225 | kineticFactor, modifiedOriginal, |
---|
| 2226 | PinNucleus, NinNucleus, targetNucleus, |
---|
| 2227 | vec, vecLen ); |
---|
| 2228 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2229 | } |
---|
| 2230 | //if( centerofmassEnergy <= (4.0+G4UniformRand()) ) |
---|
| 2231 | // MomentumCheck( modifiedOriginal, currentParticle, targetParticle, vec, vecLen ); |
---|
| 2232 | // |
---|
| 2233 | // calculate time delay for nuclear reactions |
---|
| 2234 | // |
---|
| 2235 | if( (atomicWeight >= 1.5) && (atomicWeight <= 230.0) && (ekOriginal <= 0.2) ) |
---|
| 2236 | currentParticle.SetTOF( 1.0-500.0*std::exp(-ekOriginal/0.04)*std::log(G4UniformRand()) ); |
---|
| 2237 | else |
---|
| 2238 | currentParticle.SetTOF( 1.0 ); |
---|
| 2239 | |
---|
| 2240 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2241 | return true; |
---|
| 2242 | } |
---|
| 2243 | |
---|
| 2244 | void G4ReactionDynamics::TwoBody( |
---|
| 2245 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
| 2246 | G4int &vecLen, |
---|
| 2247 | G4ReactionProduct &modifiedOriginal, |
---|
| 2248 | const G4DynamicParticle* originalTarget, |
---|
| 2249 | G4ReactionProduct ¤tParticle, |
---|
| 2250 | G4ReactionProduct &targetParticle, |
---|
| 2251 | const G4Nucleus &targetNucleus, |
---|
| 2252 | G4bool &/* targetHasChanged*/ ) |
---|
| 2253 | { |
---|
| 2254 | // |
---|
| 2255 | // derived from original FORTRAN code TWOB by H. Fesefeldt (15-Sep-1987) |
---|
| 2256 | // |
---|
| 2257 | // Generation of momenta for elastic and quasi-elastic 2 body reactions |
---|
| 2258 | // |
---|
| 2259 | // The simple formula ds/d|t| = s0* std::exp(-b*|t|) is used. |
---|
| 2260 | // The b values are parametrizations from experimental data. |
---|
| 2261 | // Not available values are taken from those of similar reactions. |
---|
| 2262 | // |
---|
| 2263 | |
---|
| 2264 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2265 | static const G4double expxu = 82.; // upper bound for arg. of exp |
---|
| 2266 | static const G4double expxl = -expxu; // lower bound for arg. of exp |
---|
| 2267 | |
---|
| 2268 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/GeV; |
---|
| 2269 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
---|
| 2270 | const G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
---|
| 2271 | const G4double pOriginal = modifiedOriginal.GetMomentum().mag()/GeV; |
---|
| 2272 | G4double currentMass = currentParticle.GetMass()/GeV; |
---|
| 2273 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
---|
| 2274 | |
---|
| 2275 | targetMass = targetParticle.GetMass()/GeV; |
---|
| 2276 | const G4double atomicWeight = targetNucleus.GetN(); |
---|
| 2277 | |
---|
| 2278 | G4double etCurrent = currentParticle.GetTotalEnergy()/GeV; |
---|
| 2279 | G4double pCurrent = currentParticle.GetTotalMomentum()/GeV; |
---|
| 2280 | |
---|
| 2281 | G4double cmEnergy = std::sqrt( currentMass*currentMass + |
---|
| 2282 | targetMass*targetMass + |
---|
| 2283 | 2.0*targetMass*etCurrent ); // in GeV |
---|
| 2284 | |
---|
| 2285 | //if( (pOriginal < 0.1) || |
---|
| 2286 | // (centerofmassEnergy < 0.01) ) // 2-body scattering not possible |
---|
| 2287 | // Continue with original particle, but spend the nuclear evaporation energy |
---|
| 2288 | // targetParticle.SetMass( 0.0 ); // flag that the target doesn't exist |
---|
| 2289 | //else // Two-body scattering is possible |
---|
| 2290 | |
---|
| 2291 | if( (pCurrent < 0.1) || (cmEnergy < 0.01) ) // 2-body scattering not possible |
---|
| 2292 | { |
---|
| 2293 | targetParticle.SetMass( 0.0 ); // flag that the target particle doesn't exist |
---|
| 2294 | } |
---|
| 2295 | else |
---|
| 2296 | { |
---|
| 2297 | // moved this if-block to a later stage, i.e. to the assignment of the scattering angle |
---|
| 2298 | // @@@@@ double-check. |
---|
| 2299 | // if (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 2300 | // targetParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 2301 | // if( G4UniformRand() < 0.5 ) |
---|
| 2302 | // targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
---|
| 2303 | // else |
---|
| 2304 | // targetParticle.SetDefinitionAndUpdateE( aProton ); |
---|
| 2305 | // targetHasChanged = true; |
---|
| 2306 | // targetMass = targetParticle.GetMass()/GeV; |
---|
| 2307 | // } |
---|
| 2308 | // |
---|
| 2309 | // Set masses and momenta for final state particles |
---|
| 2310 | // |
---|
| 2311 | G4double pf = cmEnergy*cmEnergy + targetMass*targetMass - currentMass*currentMass; |
---|
| 2312 | pf = pf*pf - 4*cmEnergy*cmEnergy*targetMass*targetMass; |
---|
| 2313 | |
---|
| 2314 | if( pf < 0.001 ) |
---|
| 2315 | { |
---|
| 2316 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
---|
| 2317 | vecLen = 0; |
---|
| 2318 | throw G4HadronicException(__FILE__, __LINE__, "G4ReactionDynamics::TwoBody: pf is too small "); |
---|
| 2319 | } |
---|
| 2320 | |
---|
| 2321 | pf = std::sqrt( pf ) / ( 2.0*cmEnergy ); |
---|
| 2322 | // |
---|
| 2323 | // Set beam and target in centre of mass system |
---|
| 2324 | // |
---|
| 2325 | G4ReactionProduct pseudoParticle[3]; |
---|
| 2326 | |
---|
| 2327 | if (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 2328 | targetParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 2329 | pseudoParticle[0].SetMass( targetMass*GeV ); |
---|
| 2330 | pseudoParticle[0].SetTotalEnergy( etOriginal*GeV ); |
---|
| 2331 | pseudoParticle[0].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
| 2332 | |
---|
| 2333 | pseudoParticle[1].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 2334 | pseudoParticle[1].SetMass( mOriginal*GeV ); |
---|
| 2335 | pseudoParticle[1].SetKineticEnergy( 0.0 ); |
---|
| 2336 | |
---|
| 2337 | } else { |
---|
| 2338 | pseudoParticle[0].SetMass( currentMass*GeV ); |
---|
| 2339 | pseudoParticle[0].SetTotalEnergy( etCurrent*GeV ); |
---|
| 2340 | pseudoParticle[0].SetMomentum( 0.0, 0.0, pCurrent*GeV ); |
---|
| 2341 | |
---|
| 2342 | pseudoParticle[1].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 2343 | pseudoParticle[1].SetMass( targetMass*GeV ); |
---|
| 2344 | pseudoParticle[1].SetKineticEnergy( 0.0 ); |
---|
| 2345 | } |
---|
| 2346 | // |
---|
| 2347 | // Transform into centre of mass system |
---|
| 2348 | // |
---|
| 2349 | pseudoParticle[2] = pseudoParticle[0] + pseudoParticle[1]; |
---|
| 2350 | pseudoParticle[0].Lorentz( pseudoParticle[0], pseudoParticle[2] ); |
---|
| 2351 | pseudoParticle[1].Lorentz( pseudoParticle[1], pseudoParticle[2] ); |
---|
| 2352 | // |
---|
| 2353 | // Set final state masses and energies in centre of mass system |
---|
| 2354 | // |
---|
| 2355 | currentParticle.SetTotalEnergy( std::sqrt(pf*pf+currentMass*currentMass)*GeV ); |
---|
| 2356 | targetParticle.SetTotalEnergy( std::sqrt(pf*pf+targetMass*targetMass)*GeV ); |
---|
| 2357 | // |
---|
| 2358 | // Set |t| and |tmin| |
---|
| 2359 | // |
---|
| 2360 | const G4double cb = 0.01; |
---|
| 2361 | const G4double b1 = 4.225; |
---|
| 2362 | const G4double b2 = 1.795; |
---|
| 2363 | // |
---|
| 2364 | // Calculate slope b for elastic scattering on proton/neutron |
---|
| 2365 | // |
---|
| 2366 | G4double b = std::max( cb, b1+b2*std::log(pOriginal) ); |
---|
| 2367 | G4double btrang = b * 4.0 * pf * pseudoParticle[0].GetMomentum().mag()/GeV; |
---|
| 2368 | |
---|
| 2369 | G4double exindt = -1.0; |
---|
| 2370 | exindt += std::exp(std::max(-btrang,expxl)); |
---|
| 2371 | // |
---|
| 2372 | // Calculate sqr(std::sin(teta/2.) and std::cos(teta), set azimuth angle phi |
---|
| 2373 | // |
---|
| 2374 | G4double ctet = 1.0 + 2*std::log( 1.0+G4UniformRand()*exindt ) / btrang; |
---|
| 2375 | if( std::fabs(ctet) > 1.0 )ctet > 0.0 ? ctet = 1.0 : ctet = -1.0; |
---|
| 2376 | G4double stet = std::sqrt( (1.0-ctet)*(1.0+ctet) ); |
---|
| 2377 | G4double phi = twopi * G4UniformRand(); |
---|
| 2378 | // |
---|
| 2379 | // Calculate final state momenta in centre of mass system |
---|
| 2380 | // |
---|
| 2381 | if (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 2382 | targetParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 2383 | |
---|
| 2384 | currentParticle.SetMomentum( -pf*stet*std::sin(phi)*GeV, |
---|
| 2385 | -pf*stet*std::cos(phi)*GeV, |
---|
| 2386 | -pf*ctet*GeV ); |
---|
| 2387 | } else { |
---|
| 2388 | |
---|
| 2389 | currentParticle.SetMomentum( pf*stet*std::sin(phi)*GeV, |
---|
| 2390 | pf*stet*std::cos(phi)*GeV, |
---|
| 2391 | pf*ctet*GeV ); |
---|
| 2392 | } |
---|
| 2393 | targetParticle.SetMomentum( currentParticle.GetMomentum() * (-1.0) ); |
---|
| 2394 | // |
---|
| 2395 | // Transform into lab system |
---|
| 2396 | // |
---|
| 2397 | currentParticle.Lorentz( currentParticle, pseudoParticle[1] ); |
---|
| 2398 | targetParticle.Lorentz( targetParticle, pseudoParticle[1] ); |
---|
| 2399 | |
---|
| 2400 | Defs1( modifiedOriginal, currentParticle, targetParticle, vec, vecLen ); |
---|
| 2401 | |
---|
| 2402 | G4double pp, pp1, ekin; |
---|
| 2403 | if( atomicWeight >= 1.5 ) |
---|
| 2404 | { |
---|
| 2405 | const G4double cfa = 0.025*((atomicWeight-1.)/120.)*std::exp(-(atomicWeight-1.)/120.); |
---|
| 2406 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 2407 | if( pp1 >= 1.0 ) |
---|
| 2408 | { |
---|
| 2409 | ekin = currentParticle.GetKineticEnergy()/MeV - cfa*(1.0+0.5*normal())*GeV; |
---|
| 2410 | ekin = std::max( 0.0001*GeV, ekin ); |
---|
| 2411 | currentParticle.SetKineticEnergy( ekin*MeV ); |
---|
| 2412 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
| 2413 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 2414 | } |
---|
| 2415 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
| 2416 | if( pp1 >= 1.0 ) |
---|
| 2417 | { |
---|
| 2418 | ekin = targetParticle.GetKineticEnergy()/MeV - cfa*(1.0+normal()/2.)*GeV; |
---|
| 2419 | ekin = std::max( 0.0001*GeV, ekin ); |
---|
| 2420 | targetParticle.SetKineticEnergy( ekin*MeV ); |
---|
| 2421 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
| 2422 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 2423 | } |
---|
| 2424 | } |
---|
| 2425 | } |
---|
| 2426 | |
---|
| 2427 | // Get number of final state nucleons and nucleons remaining in |
---|
| 2428 | // target nucleus |
---|
| 2429 | |
---|
| 2430 | std::pair<G4int, G4int> finalStateNucleons = |
---|
| 2431 | GetFinalStateNucleons(originalTarget, vec, vecLen); |
---|
| 2432 | G4int protonsInFinalState = finalStateNucleons.first; |
---|
| 2433 | G4int neutronsInFinalState = finalStateNucleons.second; |
---|
| 2434 | |
---|
| 2435 | G4int PinNucleus = std::max(0, |
---|
| 2436 | G4int(targetNucleus.GetZ()) - protonsInFinalState); |
---|
| 2437 | G4int NinNucleus = std::max(0, |
---|
| 2438 | G4int(targetNucleus.GetN()-targetNucleus.GetZ()) - neutronsInFinalState); |
---|
| 2439 | |
---|
| 2440 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2441 | if( atomicWeight >= 1.5 ) |
---|
| 2442 | { |
---|
| 2443 | // Add black track particles |
---|
| 2444 | // npnb is number of proton/neutron black track particles |
---|
| 2445 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
| 2446 | // epnb is the kinetic energy available for proton/neutron black track particles |
---|
| 2447 | // edta is the kinetic energy available for deuteron/triton/alpha particles |
---|
| 2448 | // |
---|
| 2449 | G4double epnb, edta; |
---|
| 2450 | G4int npnb=0, ndta=0; |
---|
| 2451 | |
---|
| 2452 | epnb = targetNucleus.GetPNBlackTrackEnergy(); // was enp1 in fortran code |
---|
| 2453 | edta = targetNucleus.GetDTABlackTrackEnergy(); // was enp3 in fortran code |
---|
| 2454 | const G4double pnCutOff = 0.0001; // GeV |
---|
| 2455 | const G4double dtaCutOff = 0.0001; // GeV |
---|
| 2456 | const G4double kineticMinimum = 0.0001; |
---|
| 2457 | const G4double kineticFactor = -0.010; |
---|
| 2458 | G4double sprob = 0.0; // sprob = probability of self-absorption in heavy molecules |
---|
| 2459 | if( epnb >= pnCutOff ) |
---|
| 2460 | { |
---|
| 2461 | npnb = Poisson( epnb/0.02 ); |
---|
| 2462 | if( npnb > atomicWeight )npnb = G4int(atomicWeight); |
---|
| 2463 | if( (epnb > pnCutOff) && (npnb <= 0) )npnb = 1; |
---|
| 2464 | npnb = std::min( npnb, 127-vecLen ); |
---|
| 2465 | } |
---|
| 2466 | if( edta >= dtaCutOff ) |
---|
| 2467 | { |
---|
| 2468 | ndta = G4int(2.0 * std::log(atomicWeight)); |
---|
| 2469 | ndta = std::min( ndta, 127-vecLen ); |
---|
| 2470 | } |
---|
| 2471 | |
---|
| 2472 | if (npnb == 0 && ndta == 0) npnb = 1; |
---|
| 2473 | |
---|
| 2474 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2475 | |
---|
| 2476 | AddBlackTrackParticles(epnb, npnb, edta, ndta, sprob, kineticMinimum, |
---|
| 2477 | kineticFactor, modifiedOriginal, |
---|
| 2478 | PinNucleus, NinNucleus, targetNucleus, |
---|
| 2479 | vec, vecLen); |
---|
| 2480 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2481 | } |
---|
| 2482 | // |
---|
| 2483 | // calculate time delay for nuclear reactions |
---|
| 2484 | // |
---|
| 2485 | if( (atomicWeight >= 1.5) && (atomicWeight <= 230.0) && (ekOriginal <= 0.2) ) |
---|
| 2486 | currentParticle.SetTOF( 1.0-500.0*std::exp(-ekOriginal/0.04)*std::log(G4UniformRand()) ); |
---|
| 2487 | else |
---|
| 2488 | currentParticle.SetTOF( 1.0 ); |
---|
| 2489 | return; |
---|
| 2490 | } |
---|
| 2491 | |
---|
| 2492 | G4double G4ReactionDynamics::GenerateNBodyEvent( |
---|
| 2493 | const G4double totalEnergy, // MeV |
---|
| 2494 | const G4bool constantCrossSection, |
---|
| 2495 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
| 2496 | G4int &vecLen ) |
---|
| 2497 | { |
---|
| 2498 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2499 | // derived from original FORTRAN code PHASP by H. Fesefeldt (02-Dec-1986) |
---|
| 2500 | // Returns the weight of the event |
---|
| 2501 | // |
---|
| 2502 | G4int i; |
---|
| 2503 | const G4double expxu = 82.; // upper bound for arg. of exp |
---|
| 2504 | const G4double expxl = -expxu; // lower bound for arg. of exp |
---|
| 2505 | if( vecLen < 2 ) |
---|
| 2506 | { |
---|
| 2507 | G4cerr << "*** Error in G4ReactionDynamics::GenerateNBodyEvent" << G4endl; |
---|
| 2508 | G4cerr << " number of particles < 2" << G4endl; |
---|
| 2509 | G4cerr << "totalEnergy = " << totalEnergy << "MeV, vecLen = " << vecLen << G4endl; |
---|
| 2510 | return -1.0; |
---|
| 2511 | } |
---|
| 2512 | G4double mass[18]; // mass of each particle |
---|
| 2513 | G4double energy[18]; // total energy of each particle |
---|
| 2514 | G4double pcm[3][18]; // pcm is an array with 3 rows and vecLen columns |
---|
| 2515 | |
---|
| 2516 | G4double totalMass = 0.0; |
---|
| 2517 | G4double extraMass = 0; |
---|
| 2518 | G4double sm[18]; |
---|
| 2519 | |
---|
| 2520 | for( i=0; i<vecLen; ++i ) |
---|
| 2521 | { |
---|
| 2522 | mass[i] = vec[i]->GetMass()/GeV; |
---|
| 2523 | if(vec[i]->GetSide() == -2) extraMass+=vec[i]->GetMass()/GeV; |
---|
| 2524 | vec[i]->SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 2525 | pcm[0][i] = 0.0; // x-momentum of i-th particle |
---|
| 2526 | pcm[1][i] = 0.0; // y-momentum of i-th particle |
---|
| 2527 | pcm[2][i] = 0.0; // z-momentum of i-th particle |
---|
| 2528 | energy[i] = mass[i]; // total energy of i-th particle |
---|
| 2529 | totalMass += mass[i]; |
---|
| 2530 | sm[i] = totalMass; |
---|
| 2531 | } |
---|
| 2532 | G4double totalE = totalEnergy/GeV; |
---|
| 2533 | if( totalMass > totalE ) |
---|
| 2534 | { |
---|
| 2535 | //G4cerr << "*** Error in G4ReactionDynamics::GenerateNBodyEvent" << G4endl; |
---|
| 2536 | //G4cerr << " total mass (" << totalMass*GeV << "MeV) > total energy (" |
---|
| 2537 | // << totalEnergy << "MeV)" << G4endl; |
---|
| 2538 | totalE = totalMass; |
---|
| 2539 | return -1.0; |
---|
| 2540 | } |
---|
| 2541 | G4double kineticEnergy = totalE - totalMass; |
---|
| 2542 | G4double emm[18]; |
---|
| 2543 | //G4double *emm = new G4double [vecLen]; |
---|
| 2544 | emm[0] = mass[0]; |
---|
| 2545 | emm[vecLen-1] = totalE; |
---|
| 2546 | if( vecLen > 2 ) // the random numbers are sorted |
---|
| 2547 | { |
---|
| 2548 | G4double ran[18]; |
---|
| 2549 | for( i=0; i<vecLen; ++i )ran[i] = G4UniformRand(); |
---|
| 2550 | for( i=0; i<vecLen-2; ++i ) |
---|
| 2551 | { |
---|
| 2552 | for( G4int j=vecLen-2; j>i; --j ) |
---|
| 2553 | { |
---|
| 2554 | if( ran[i] > ran[j] ) |
---|
| 2555 | { |
---|
| 2556 | G4double temp = ran[i]; |
---|
| 2557 | ran[i] = ran[j]; |
---|
| 2558 | ran[j] = temp; |
---|
| 2559 | } |
---|
| 2560 | } |
---|
| 2561 | } |
---|
| 2562 | for( i=1; i<vecLen-1; ++i )emm[i] = ran[i-1]*kineticEnergy + sm[i]; |
---|
| 2563 | } |
---|
| 2564 | // Weight is the sum of logarithms of terms instead of the product of terms |
---|
| 2565 | G4bool lzero = true; |
---|
| 2566 | G4double wtmax = 0.0; |
---|
| 2567 | if( constantCrossSection ) // this is KGENEV=1 in PHASP |
---|
| 2568 | { |
---|
| 2569 | G4double emmax = kineticEnergy + mass[0]; |
---|
| 2570 | G4double emmin = 0.0; |
---|
| 2571 | for( i=1; i<vecLen; ++i ) |
---|
| 2572 | { |
---|
| 2573 | emmin += mass[i-1]; |
---|
| 2574 | emmax += mass[i]; |
---|
| 2575 | G4double wtfc = 0.0; |
---|
| 2576 | if( emmax*emmax > 0.0 ) |
---|
| 2577 | { |
---|
| 2578 | G4double arg = emmax*emmax |
---|
| 2579 | + (emmin*emmin-mass[i]*mass[i])*(emmin*emmin-mass[i]*mass[i])/(emmax*emmax) |
---|
| 2580 | - 2.0*(emmin*emmin+mass[i]*mass[i]); |
---|
| 2581 | if( arg > 0.0 )wtfc = 0.5*std::sqrt( arg ); |
---|
| 2582 | } |
---|
| 2583 | if( wtfc == 0.0 ) |
---|
| 2584 | { |
---|
| 2585 | lzero = false; |
---|
| 2586 | break; |
---|
| 2587 | } |
---|
| 2588 | wtmax += std::log( wtfc ); |
---|
| 2589 | } |
---|
| 2590 | if( lzero ) |
---|
| 2591 | wtmax = -wtmax; |
---|
| 2592 | else |
---|
| 2593 | wtmax = expxu; |
---|
| 2594 | } |
---|
| 2595 | else |
---|
| 2596 | { |
---|
| 2597 | // ffq(n) = pi*(2*pi)^(n-2)/(n-2)! |
---|
| 2598 | const G4double ffq[18] = { 0., 3.141592, 19.73921, 62.01255, 129.8788, 204.0131, |
---|
| 2599 | 256.3704, 268.4705, 240.9780, 189.2637, |
---|
| 2600 | 132.1308, 83.0202, 47.4210, 24.8295, |
---|
| 2601 | 12.0006, 5.3858, 2.2560, 0.8859 }; |
---|
| 2602 | wtmax = std::log( std::pow( kineticEnergy, vecLen-2 ) * ffq[vecLen-1] / totalE ); |
---|
| 2603 | } |
---|
| 2604 | lzero = true; |
---|
| 2605 | G4double pd[50]; |
---|
| 2606 | //G4double *pd = new G4double [vecLen-1]; |
---|
| 2607 | for( i=0; i<vecLen-1; ++i ) |
---|
| 2608 | { |
---|
| 2609 | pd[i] = 0.0; |
---|
| 2610 | if( emm[i+1]*emm[i+1] > 0.0 ) |
---|
| 2611 | { |
---|
| 2612 | G4double arg = emm[i+1]*emm[i+1] |
---|
| 2613 | + (emm[i]*emm[i]-mass[i+1]*mass[i+1])*(emm[i]*emm[i]-mass[i+1]*mass[i+1]) |
---|
| 2614 | /(emm[i+1]*emm[i+1]) |
---|
| 2615 | - 2.0*(emm[i]*emm[i]+mass[i+1]*mass[i+1]); |
---|
| 2616 | if( arg > 0.0 )pd[i] = 0.5*std::sqrt( arg ); |
---|
| 2617 | } |
---|
| 2618 | if( pd[i] <= 0.0 ) // changed from == on 02 April 98 |
---|
| 2619 | lzero = false; |
---|
| 2620 | else |
---|
| 2621 | wtmax += std::log( pd[i] ); |
---|
| 2622 | } |
---|
| 2623 | G4double weight = 0.0; // weight is returned by GenerateNBodyEvent |
---|
| 2624 | if( lzero )weight = std::exp( std::max(std::min(wtmax,expxu),expxl) ); |
---|
| 2625 | |
---|
| 2626 | G4double bang, cb, sb, s0, s1, s2, c, s, esys, a, b, gama, beta; |
---|
| 2627 | pcm[0][0] = 0.0; |
---|
| 2628 | pcm[1][0] = pd[0]; |
---|
| 2629 | pcm[2][0] = 0.0; |
---|
| 2630 | for( i=1; i<vecLen; ++i ) |
---|
| 2631 | { |
---|
| 2632 | pcm[0][i] = 0.0; |
---|
| 2633 | pcm[1][i] = -pd[i-1]; |
---|
| 2634 | pcm[2][i] = 0.0; |
---|
| 2635 | bang = twopi*G4UniformRand(); |
---|
| 2636 | cb = std::cos(bang); |
---|
| 2637 | sb = std::sin(bang); |
---|
| 2638 | c = 2.0*G4UniformRand() - 1.0; |
---|
| 2639 | s = std::sqrt( std::fabs( 1.0-c*c ) ); |
---|
| 2640 | if( i < vecLen-1 ) |
---|
| 2641 | { |
---|
| 2642 | esys = std::sqrt(pd[i]*pd[i] + emm[i]*emm[i]); |
---|
| 2643 | beta = pd[i]/esys; |
---|
| 2644 | gama = esys/emm[i]; |
---|
| 2645 | for( G4int j=0; j<=i; ++j ) |
---|
| 2646 | { |
---|
| 2647 | s0 = pcm[0][j]; |
---|
| 2648 | s1 = pcm[1][j]; |
---|
| 2649 | s2 = pcm[2][j]; |
---|
| 2650 | energy[j] = std::sqrt( s0*s0 + s1*s1 + s2*s2 + mass[j]*mass[j] ); |
---|
| 2651 | a = s0*c - s1*s; // rotation |
---|
| 2652 | pcm[1][j] = s0*s + s1*c; |
---|
| 2653 | b = pcm[2][j]; |
---|
| 2654 | pcm[0][j] = a*cb - b*sb; |
---|
| 2655 | pcm[2][j] = a*sb + b*cb; |
---|
| 2656 | pcm[1][j] = gama*(pcm[1][j] + beta*energy[j]); |
---|
| 2657 | } |
---|
| 2658 | } |
---|
| 2659 | else |
---|
| 2660 | { |
---|
| 2661 | for( G4int j=0; j<=i; ++j ) |
---|
| 2662 | { |
---|
| 2663 | s0 = pcm[0][j]; |
---|
| 2664 | s1 = pcm[1][j]; |
---|
| 2665 | s2 = pcm[2][j]; |
---|
| 2666 | energy[j] = std::sqrt( s0*s0 + s1*s1 + s2*s2 + mass[j]*mass[j] ); |
---|
| 2667 | a = s0*c - s1*s; // rotation |
---|
| 2668 | pcm[1][j] = s0*s + s1*c; |
---|
| 2669 | b = pcm[2][j]; |
---|
| 2670 | pcm[0][j] = a*cb - b*sb; |
---|
| 2671 | pcm[2][j] = a*sb + b*cb; |
---|
| 2672 | } |
---|
| 2673 | } |
---|
| 2674 | } |
---|
| 2675 | for( i=0; i<vecLen; ++i ) |
---|
| 2676 | { |
---|
| 2677 | vec[i]->SetMomentum( pcm[0][i]*GeV, pcm[1][i]*GeV, pcm[2][i]*GeV ); |
---|
| 2678 | vec[i]->SetTotalEnergy( energy[i]*GeV ); |
---|
| 2679 | } |
---|
| 2680 | |
---|
| 2681 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 2682 | return weight; |
---|
| 2683 | } |
---|
| 2684 | |
---|
| 2685 | G4double |
---|
| 2686 | G4ReactionDynamics::normal() |
---|
| 2687 | { |
---|
| 2688 | G4double ran = -6.0; |
---|
| 2689 | for( G4int i=0; i<12; ++i )ran += G4UniformRand(); |
---|
| 2690 | return ran; |
---|
| 2691 | } |
---|
| 2692 | |
---|
| 2693 | G4int |
---|
| 2694 | G4ReactionDynamics::Poisson( G4double x ) // generation of poisson distribution |
---|
| 2695 | { |
---|
| 2696 | G4int iran; |
---|
| 2697 | G4double ran; |
---|
| 2698 | |
---|
| 2699 | if( x > 9.9 ) // use normal distribution with sigma^2 = <x> |
---|
| 2700 | iran = static_cast<G4int>(std::max( 0.0, x+normal()*std::sqrt(x) ) ); |
---|
| 2701 | else { |
---|
| 2702 | G4int mm = G4int(5.0*x); |
---|
| 2703 | if( mm <= 0 ) // for very small x try iran=1,2,3 |
---|
| 2704 | { |
---|
| 2705 | G4double p1 = x*std::exp(-x); |
---|
| 2706 | G4double p2 = x*p1/2.0; |
---|
| 2707 | G4double p3 = x*p2/3.0; |
---|
| 2708 | ran = G4UniformRand(); |
---|
| 2709 | if( ran < p3 ) |
---|
| 2710 | iran = 3; |
---|
| 2711 | else if( ran < p2 ) // this is original Geisha, it should be ran < p2+p3 |
---|
| 2712 | iran = 2; |
---|
| 2713 | else if( ran < p1 ) // should be ran < p1+p2+p3 |
---|
| 2714 | iran = 1; |
---|
| 2715 | else |
---|
| 2716 | iran = 0; |
---|
| 2717 | } |
---|
| 2718 | else |
---|
| 2719 | { |
---|
| 2720 | iran = 0; |
---|
| 2721 | G4double r = std::exp(-x); |
---|
| 2722 | ran = G4UniformRand(); |
---|
| 2723 | if( ran > r ) |
---|
| 2724 | { |
---|
| 2725 | G4double rrr; |
---|
| 2726 | G4double rr = r; |
---|
| 2727 | for( G4int i=1; i<=mm; ++i ) |
---|
| 2728 | { |
---|
| 2729 | iran++; |
---|
| 2730 | if( i > 5 ) // Stirling's formula for large numbers |
---|
| 2731 | rrr = std::exp(i*std::log(x)-(i+0.5)*std::log((G4double)i)+i-0.9189385); |
---|
| 2732 | else |
---|
| 2733 | rrr = std::pow(x,i)/Factorial(i); |
---|
| 2734 | rr += r*rrr; |
---|
| 2735 | if( ran <= rr )break; |
---|
| 2736 | } |
---|
| 2737 | } |
---|
| 2738 | } |
---|
| 2739 | } |
---|
| 2740 | return iran; |
---|
| 2741 | } |
---|
| 2742 | |
---|
| 2743 | G4int |
---|
| 2744 | G4ReactionDynamics::Factorial( G4int n ) |
---|
| 2745 | { // calculates factorial( n ) = n*(n-1)*(n-2)*...*1 |
---|
| 2746 | G4int m = std::min(n,10); |
---|
| 2747 | G4int result = 1; |
---|
| 2748 | if( m <= 1 )return result; |
---|
| 2749 | for( G4int i=2; i<=m; ++i )result *= i; |
---|
| 2750 | return result; |
---|
| 2751 | } |
---|
| 2752 | |
---|
| 2753 | void G4ReactionDynamics::Defs1( |
---|
| 2754 | const G4ReactionProduct &modifiedOriginal, |
---|
| 2755 | G4ReactionProduct ¤tParticle, |
---|
| 2756 | G4ReactionProduct &targetParticle, |
---|
| 2757 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
| 2758 | G4int &vecLen ) |
---|
| 2759 | { |
---|
| 2760 | const G4double pjx = modifiedOriginal.GetMomentum().x()/MeV; |
---|
| 2761 | const G4double pjy = modifiedOriginal.GetMomentum().y()/MeV; |
---|
| 2762 | const G4double pjz = modifiedOriginal.GetMomentum().z()/MeV; |
---|
| 2763 | const G4double p = modifiedOriginal.GetMomentum().mag()/MeV; |
---|
| 2764 | if( pjx*pjx+pjy*pjy > 0.0 ) |
---|
| 2765 | { |
---|
| 2766 | G4double cost, sint, ph, cosp, sinp, pix, piy, piz; |
---|
| 2767 | cost = pjz/p; |
---|
| 2768 | sint = 0.5 * ( std::sqrt(std::abs((1.0-cost)*(1.0+cost))) + std::sqrt(pjx*pjx+pjy*pjy)/p ); |
---|
| 2769 | if( pjy < 0.0 ) |
---|
| 2770 | ph = 3*halfpi; |
---|
| 2771 | else |
---|
| 2772 | ph = halfpi; |
---|
| 2773 | if( std::abs( pjx ) > 0.001*MeV )ph = std::atan2(pjy,pjx); |
---|
| 2774 | cosp = std::cos(ph); |
---|
| 2775 | sinp = std::sin(ph); |
---|
| 2776 | pix = currentParticle.GetMomentum().x()/MeV; |
---|
| 2777 | piy = currentParticle.GetMomentum().y()/MeV; |
---|
| 2778 | piz = currentParticle.GetMomentum().z()/MeV; |
---|
| 2779 | currentParticle.SetMomentum( cost*cosp*pix*MeV - sinp*piy+sint*cosp*piz*MeV, |
---|
| 2780 | cost*sinp*pix*MeV + cosp*piy+sint*sinp*piz*MeV, |
---|
| 2781 | -sint*pix*MeV + cost*piz*MeV ); |
---|
| 2782 | pix = targetParticle.GetMomentum().x()/MeV; |
---|
| 2783 | piy = targetParticle.GetMomentum().y()/MeV; |
---|
| 2784 | piz = targetParticle.GetMomentum().z()/MeV; |
---|
| 2785 | targetParticle.SetMomentum( cost*cosp*pix*MeV - sinp*piy+sint*cosp*piz*MeV, |
---|
| 2786 | cost*sinp*pix*MeV + cosp*piy+sint*sinp*piz*MeV, |
---|
| 2787 | -sint*pix*MeV + cost*piz*MeV ); |
---|
| 2788 | for( G4int i=0; i<vecLen; ++i ) |
---|
| 2789 | { |
---|
| 2790 | pix = vec[i]->GetMomentum().x()/MeV; |
---|
| 2791 | piy = vec[i]->GetMomentum().y()/MeV; |
---|
| 2792 | piz = vec[i]->GetMomentum().z()/MeV; |
---|
| 2793 | vec[i]->SetMomentum( cost*cosp*pix*MeV - sinp*piy+sint*cosp*piz*MeV, |
---|
| 2794 | cost*sinp*pix*MeV + cosp*piy+sint*sinp*piz*MeV, |
---|
| 2795 | -sint*pix*MeV + cost*piz*MeV ); |
---|
| 2796 | } |
---|
| 2797 | } |
---|
| 2798 | else |
---|
| 2799 | { |
---|
| 2800 | if( pjz < 0.0 ) |
---|
| 2801 | { |
---|
| 2802 | currentParticle.SetMomentum( -currentParticle.GetMomentum().z() ); |
---|
| 2803 | targetParticle.SetMomentum( -targetParticle.GetMomentum().z() ); |
---|
| 2804 | for( G4int i=0; i<vecLen; ++i ) |
---|
| 2805 | vec[i]->SetMomentum( -vec[i]->GetMomentum().z() ); |
---|
| 2806 | } |
---|
| 2807 | } |
---|
| 2808 | } |
---|
| 2809 | |
---|
| 2810 | void G4ReactionDynamics::Rotate( |
---|
| 2811 | const G4double numberofFinalStateNucleons, |
---|
| 2812 | const G4ThreeVector &temp, |
---|
| 2813 | const G4ReactionProduct &modifiedOriginal, // Fermi motion & evap. effect included |
---|
| 2814 | const G4HadProjectile *originalIncident, // original incident particle |
---|
| 2815 | const G4Nucleus &targetNucleus, |
---|
| 2816 | G4ReactionProduct ¤tParticle, |
---|
| 2817 | G4ReactionProduct &targetParticle, |
---|
| 2818 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
| 2819 | G4int &vecLen ) |
---|
| 2820 | { |
---|
| 2821 | // derived from original FORTRAN code in GENXPT and TWOCLU by H. Fesefeldt |
---|
| 2822 | // |
---|
| 2823 | // Rotate in direction of z-axis, this does disturb in some way our |
---|
| 2824 | // inclusive distributions, but it is necessary for momentum conservation |
---|
| 2825 | // |
---|
| 2826 | const G4double atomicWeight = targetNucleus.GetN(); |
---|
| 2827 | const G4double logWeight = std::log(atomicWeight); |
---|
| 2828 | |
---|
| 2829 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
---|
| 2830 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
---|
| 2831 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
---|
| 2832 | |
---|
| 2833 | G4int i; |
---|
| 2834 | G4ThreeVector pseudoParticle[4]; |
---|
| 2835 | for( i=0; i<4; ++i )pseudoParticle[i].set(0,0,0); |
---|
| 2836 | pseudoParticle[0] = currentParticle.GetMomentum() |
---|
| 2837 | + targetParticle.GetMomentum(); |
---|
| 2838 | for( i=0; i<vecLen; ++i ) |
---|
| 2839 | pseudoParticle[0] = pseudoParticle[0] + (vec[i]->GetMomentum()); |
---|
| 2840 | // |
---|
| 2841 | // Some smearing in transverse direction from Fermi motion |
---|
| 2842 | // |
---|
| 2843 | G4float pp, pp1; |
---|
| 2844 | G4double alekw, p; |
---|
| 2845 | G4double r1, r2, a1, ran1, ran2, xxh, exh, pxTemp, pyTemp, pzTemp; |
---|
| 2846 | |
---|
| 2847 | r1 = twopi*G4UniformRand(); |
---|
| 2848 | r2 = G4UniformRand(); |
---|
| 2849 | a1 = std::sqrt(-2.0*std::log(r2)); |
---|
| 2850 | ran1 = a1*std::sin(r1)*0.020*numberofFinalStateNucleons*GeV; |
---|
| 2851 | ran2 = a1*std::cos(r1)*0.020*numberofFinalStateNucleons*GeV; |
---|
| 2852 | G4ThreeVector fermi(ran1, ran2, 0); |
---|
| 2853 | |
---|
| 2854 | pseudoParticle[0] = pseudoParticle[0]+fermi; // all particles + fermi |
---|
| 2855 | pseudoParticle[2] = temp; // original in cms system |
---|
| 2856 | pseudoParticle[3] = pseudoParticle[0]; |
---|
| 2857 | |
---|
| 2858 | pseudoParticle[1] = pseudoParticle[2].cross(pseudoParticle[3]); |
---|
| 2859 | G4double rotation = 2.*pi*G4UniformRand(); |
---|
| 2860 | pseudoParticle[1] = pseudoParticle[1].rotate(rotation, pseudoParticle[3]); |
---|
| 2861 | pseudoParticle[2] = pseudoParticle[3].cross(pseudoParticle[1]); |
---|
| 2862 | for(G4int ii=1; ii<=3; ii++) |
---|
| 2863 | { |
---|
| 2864 | p = pseudoParticle[ii].mag(); |
---|
| 2865 | if( p == 0.0 ) |
---|
| 2866 | pseudoParticle[ii]= G4ThreeVector( 0.0, 0.0, 0.0 ); |
---|
| 2867 | else |
---|
| 2868 | pseudoParticle[ii]= pseudoParticle[ii] * (1./p); |
---|
| 2869 | } |
---|
| 2870 | |
---|
| 2871 | pxTemp = pseudoParticle[1].dot(currentParticle.GetMomentum()); |
---|
| 2872 | pyTemp = pseudoParticle[2].dot(currentParticle.GetMomentum()); |
---|
| 2873 | pzTemp = pseudoParticle[3].dot(currentParticle.GetMomentum()); |
---|
| 2874 | currentParticle.SetMomentum( pxTemp, pyTemp, pzTemp ); |
---|
| 2875 | |
---|
| 2876 | pxTemp = pseudoParticle[1].dot(targetParticle.GetMomentum()); |
---|
| 2877 | pyTemp = pseudoParticle[2].dot(targetParticle.GetMomentum()); |
---|
| 2878 | pzTemp = pseudoParticle[3].dot(targetParticle.GetMomentum()); |
---|
| 2879 | targetParticle.SetMomentum( pxTemp, pyTemp, pzTemp ); |
---|
| 2880 | |
---|
| 2881 | for( i=0; i<vecLen; ++i ) |
---|
| 2882 | { |
---|
| 2883 | pxTemp = pseudoParticle[1].dot(vec[i]->GetMomentum()); |
---|
| 2884 | pyTemp = pseudoParticle[2].dot(vec[i]->GetMomentum()); |
---|
| 2885 | pzTemp = pseudoParticle[3].dot(vec[i]->GetMomentum()); |
---|
| 2886 | vec[i]->SetMomentum( pxTemp, pyTemp, pzTemp ); |
---|
| 2887 | } |
---|
| 2888 | // |
---|
| 2889 | // Rotate in direction of primary particle, subtract binding energies |
---|
| 2890 | // and make some further corrections if required |
---|
| 2891 | // |
---|
| 2892 | Defs1( modifiedOriginal, currentParticle, targetParticle, vec, vecLen ); |
---|
| 2893 | G4double ekin; |
---|
| 2894 | G4double dekin = 0.0; |
---|
| 2895 | G4double ek1 = 0.0; |
---|
| 2896 | G4int npions = 0; |
---|
| 2897 | if( atomicWeight >= 1.5 ) // self-absorption in heavy molecules |
---|
| 2898 | { |
---|
| 2899 | // corrections for single particle spectra (shower particles) |
---|
| 2900 | // |
---|
| 2901 | const G4double alem[] = { 1.40, 2.30, 2.70, 3.00, 3.40, 4.60, 7.00 }; |
---|
| 2902 | const G4double val0[] = { 0.00, 0.40, 0.48, 0.51, 0.54, 0.60, 0.65 }; |
---|
| 2903 | alekw = std::log( originalIncident->GetKineticEnergy()/GeV ); |
---|
| 2904 | exh = 1.0; |
---|
| 2905 | if( alekw > alem[0] ) // get energy bin |
---|
| 2906 | { |
---|
| 2907 | exh = val0[6]; |
---|
| 2908 | for( G4int j=1; j<7; ++j ) |
---|
| 2909 | { |
---|
| 2910 | if( alekw < alem[j] ) // use linear interpolation/extrapolation |
---|
| 2911 | { |
---|
| 2912 | G4double rcnve = (val0[j] - val0[j-1]) / (alem[j] - alem[j-1]); |
---|
| 2913 | exh = rcnve * alekw + val0[j-1] - rcnve * alem[j-1]; |
---|
| 2914 | break; |
---|
| 2915 | } |
---|
| 2916 | } |
---|
| 2917 | exh = 1.0 - exh; |
---|
| 2918 | } |
---|
| 2919 | const G4double cfa = 0.025*((atomicWeight-1.)/120.)*std::exp(-(atomicWeight-1.)/120.); |
---|
| 2920 | ekin = currentParticle.GetKineticEnergy()/GeV - cfa*(1+normal()/2.0); |
---|
| 2921 | ekin = std::max( 1.0e-6, ekin ); |
---|
| 2922 | xxh = 1.0; |
---|
| 2923 | if( (modifiedOriginal.GetDefinition() == aPiPlus || |
---|
| 2924 | modifiedOriginal.GetDefinition() == aPiMinus) && |
---|
| 2925 | currentParticle.GetDefinition() == aPiZero && |
---|
| 2926 | G4UniformRand() <= logWeight) xxh = exh; |
---|
| 2927 | dekin += ekin*(1.0-xxh); |
---|
| 2928 | ekin *= xxh; |
---|
| 2929 | if (currentParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 2930 | ++npions; |
---|
| 2931 | ek1 += ekin; |
---|
| 2932 | } |
---|
| 2933 | currentParticle.SetKineticEnergy( ekin*GeV ); |
---|
| 2934 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
| 2935 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 2936 | if( pp1 < 0.001*MeV ) |
---|
| 2937 | { |
---|
| 2938 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 2939 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 2940 | G4double phi = twopi*G4UniformRand(); |
---|
| 2941 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 2942 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 2943 | pp*costheta*MeV ) ; |
---|
| 2944 | } |
---|
| 2945 | else |
---|
| 2946 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 2947 | ekin = targetParticle.GetKineticEnergy()/GeV - cfa*(1+normal()/2.0); |
---|
| 2948 | ekin = std::max( 1.0e-6, ekin ); |
---|
| 2949 | xxh = 1.0; |
---|
| 2950 | if( (modifiedOriginal.GetDefinition() == aPiPlus || |
---|
| 2951 | modifiedOriginal.GetDefinition() == aPiMinus) && |
---|
| 2952 | targetParticle.GetDefinition() == aPiZero && |
---|
| 2953 | G4UniformRand() < logWeight) xxh = exh; |
---|
| 2954 | dekin += ekin*(1.0-xxh); |
---|
| 2955 | ekin *= xxh; |
---|
| 2956 | if (targetParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 2957 | ++npions; |
---|
| 2958 | ek1 += ekin; |
---|
| 2959 | } |
---|
| 2960 | targetParticle.SetKineticEnergy( ekin*GeV ); |
---|
| 2961 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
| 2962 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
| 2963 | if( pp1 < 0.001*MeV ) |
---|
| 2964 | { |
---|
| 2965 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 2966 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 2967 | G4double phi = twopi*G4UniformRand(); |
---|
| 2968 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 2969 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 2970 | pp*costheta*MeV ) ; |
---|
| 2971 | } |
---|
| 2972 | else |
---|
| 2973 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 2974 | for( i=0; i<vecLen; ++i ) |
---|
| 2975 | { |
---|
| 2976 | ekin = vec[i]->GetKineticEnergy()/GeV - cfa*(1+normal()/2.0); |
---|
| 2977 | ekin = std::max( 1.0e-6, ekin ); |
---|
| 2978 | xxh = 1.0; |
---|
| 2979 | if( (modifiedOriginal.GetDefinition() == aPiPlus || |
---|
| 2980 | modifiedOriginal.GetDefinition() == aPiMinus) && |
---|
| 2981 | vec[i]->GetDefinition() == aPiZero && |
---|
| 2982 | G4UniformRand() < logWeight) xxh = exh; |
---|
| 2983 | dekin += ekin*(1.0-xxh); |
---|
| 2984 | ekin *= xxh; |
---|
| 2985 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 2986 | ++npions; |
---|
| 2987 | ek1 += ekin; |
---|
| 2988 | } |
---|
| 2989 | vec[i]->SetKineticEnergy( ekin*GeV ); |
---|
| 2990 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
| 2991 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
| 2992 | if( pp1 < 0.001*MeV ) |
---|
| 2993 | { |
---|
| 2994 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 2995 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 2996 | G4double phi = twopi*G4UniformRand(); |
---|
| 2997 | vec[i]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 2998 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 2999 | pp*costheta*MeV ) ; |
---|
| 3000 | } |
---|
| 3001 | else |
---|
| 3002 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
| 3003 | } |
---|
| 3004 | } |
---|
| 3005 | if( (ek1 != 0.0) && (npions > 0) ) |
---|
| 3006 | { |
---|
| 3007 | dekin = 1.0 + dekin/ek1; |
---|
| 3008 | // |
---|
| 3009 | // first do the incident particle |
---|
| 3010 | // |
---|
| 3011 | if (currentParticle.GetDefinition()->GetParticleSubType() == "pi") |
---|
| 3012 | { |
---|
| 3013 | currentParticle.SetKineticEnergy( |
---|
| 3014 | std::max( 0.001*MeV, dekin*currentParticle.GetKineticEnergy() ) ); |
---|
| 3015 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
| 3016 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 3017 | if( pp1 < 0.001 ) |
---|
| 3018 | { |
---|
| 3019 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 3020 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 3021 | G4double phi = twopi*G4UniformRand(); |
---|
| 3022 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 3023 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 3024 | pp*costheta*MeV ) ; |
---|
| 3025 | } else { |
---|
| 3026 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 3027 | } |
---|
| 3028 | } |
---|
| 3029 | |
---|
| 3030 | if (targetParticle.GetDefinition()->GetParticleSubType() == "pi") |
---|
| 3031 | { |
---|
| 3032 | targetParticle.SetKineticEnergy( |
---|
| 3033 | std::max( 0.001*MeV, dekin*targetParticle.GetKineticEnergy() ) ); |
---|
| 3034 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
| 3035 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
| 3036 | if( pp1 < 0.001 ) |
---|
| 3037 | { |
---|
| 3038 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 3039 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 3040 | G4double phi = twopi*G4UniformRand(); |
---|
| 3041 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 3042 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 3043 | pp*costheta*MeV ) ; |
---|
| 3044 | } else { |
---|
| 3045 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 3046 | } |
---|
| 3047 | } |
---|
| 3048 | |
---|
| 3049 | for( i=0; i<vecLen; ++i ) |
---|
| 3050 | { |
---|
| 3051 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") |
---|
| 3052 | { |
---|
| 3053 | vec[i]->SetKineticEnergy( std::max( 0.001*MeV, dekin*vec[i]->GetKineticEnergy() ) ); |
---|
| 3054 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
| 3055 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
| 3056 | if( pp1 < 0.001 ) |
---|
| 3057 | { |
---|
| 3058 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
| 3059 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
| 3060 | G4double phi = twopi*G4UniformRand(); |
---|
| 3061 | vec[i]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
| 3062 | pp*sintheta*std::sin(phi)*MeV, |
---|
| 3063 | pp*costheta*MeV ) ; |
---|
| 3064 | } else { |
---|
| 3065 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
| 3066 | } |
---|
| 3067 | } |
---|
| 3068 | } // for i |
---|
| 3069 | } // if (ek1 != 0) |
---|
| 3070 | } |
---|
| 3071 | |
---|
| 3072 | void G4ReactionDynamics::AddBlackTrackParticles( |
---|
| 3073 | const G4double epnb, // GeV |
---|
| 3074 | const G4int npnb, |
---|
| 3075 | const G4double edta, // GeV |
---|
| 3076 | const G4int ndta, |
---|
| 3077 | const G4double sprob, |
---|
| 3078 | const G4double kineticMinimum, // GeV |
---|
| 3079 | const G4double kineticFactor, // GeV |
---|
| 3080 | const G4ReactionProduct &modifiedOriginal, |
---|
| 3081 | G4int PinNucleus, |
---|
| 3082 | G4int NinNucleus, |
---|
| 3083 | const G4Nucleus &targetNucleus, |
---|
| 3084 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
| 3085 | G4int &vecLen ) |
---|
| 3086 | { |
---|
| 3087 | // derived from original FORTRAN code in GENXPT and TWOCLU by H. Fesefeldt |
---|
| 3088 | // |
---|
| 3089 | // npnb is number of proton/neutron black track particles |
---|
| 3090 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
| 3091 | // epnb is the kinetic energy available for proton/neutron black track particles |
---|
| 3092 | // edta is the kinetic energy available for deuteron/triton/alpha particles |
---|
| 3093 | // |
---|
| 3094 | |
---|
| 3095 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
| 3096 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
| 3097 | G4ParticleDefinition *aDeuteron = G4Deuteron::Deuteron(); |
---|
| 3098 | G4ParticleDefinition *aTriton = G4Triton::Triton(); |
---|
| 3099 | G4ParticleDefinition *anAlpha = G4Alpha::Alpha(); |
---|
| 3100 | |
---|
| 3101 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/MeV; |
---|
| 3102 | const G4double atomicWeight = targetNucleus.GetN(); |
---|
| 3103 | const G4double atomicNumber = targetNucleus.GetZ(); |
---|
| 3104 | |
---|
| 3105 | const G4double ika1 = 3.6; |
---|
| 3106 | const G4double ika2 = 35.56; |
---|
| 3107 | const G4double ika3 = 6.45; |
---|
| 3108 | |
---|
| 3109 | G4int i; |
---|
| 3110 | G4double pp; |
---|
| 3111 | G4double kinCreated = 0; |
---|
| 3112 | G4double cfa = 0.025*((atomicWeight-1.0)/120.0) * std::exp(-(atomicWeight-1.0)/120.0); |
---|
| 3113 | |
---|
| 3114 | // First add protons and neutrons to final state |
---|
| 3115 | |
---|
| 3116 | if (npnb > 0) |
---|
| 3117 | { |
---|
| 3118 | G4double backwardKinetic = 0.0; |
---|
| 3119 | G4int local_npnb = npnb; |
---|
| 3120 | for( i=0; i<npnb; ++i ) if( G4UniformRand() < sprob ) local_npnb--; |
---|
| 3121 | G4double local_epnb = epnb; |
---|
| 3122 | if (ndta == 0) local_epnb += edta; // Retrieve unused kinetic energy |
---|
| 3123 | G4double ekin = local_epnb/std::max(1,local_npnb); |
---|
| 3124 | |
---|
| 3125 | for( i=0; i<local_npnb; ++i ) |
---|
| 3126 | { |
---|
| 3127 | G4ReactionProduct * p1 = new G4ReactionProduct(); |
---|
| 3128 | if( backwardKinetic > local_epnb ) |
---|
| 3129 | { |
---|
| 3130 | delete p1; |
---|
| 3131 | break; |
---|
| 3132 | } |
---|
| 3133 | G4double ran = G4UniformRand(); |
---|
| 3134 | G4double kinetic = -ekin*std::log(ran) - cfa*(1.0+0.5*normal()); |
---|
| 3135 | if( kinetic < 0.0 )kinetic = -0.010*std::log(ran); |
---|
| 3136 | backwardKinetic += kinetic; |
---|
| 3137 | if( backwardKinetic > local_epnb ) |
---|
| 3138 | kinetic = std::max( kineticMinimum, local_epnb-(backwardKinetic-kinetic) ); |
---|
| 3139 | |
---|
| 3140 | if (G4UniformRand() > (1.0-atomicNumber/atomicWeight)) { |
---|
| 3141 | |
---|
| 3142 | // Boil off a proton if there are any left, otherwise a neutron |
---|
| 3143 | |
---|
| 3144 | if (PinNucleus > 0) { |
---|
| 3145 | p1->SetDefinition( aProton ); |
---|
| 3146 | PinNucleus--; |
---|
| 3147 | } else if (NinNucleus > 0) { |
---|
| 3148 | p1->SetDefinition( aNeutron ); |
---|
| 3149 | NinNucleus--; |
---|
| 3150 | } else { |
---|
| 3151 | delete p1; |
---|
| 3152 | break; // no nucleons left in nucleus |
---|
| 3153 | } |
---|
| 3154 | } else { |
---|
| 3155 | |
---|
| 3156 | // Boil off a neutron if there are any left, otherwise a proton |
---|
| 3157 | |
---|
| 3158 | if (NinNucleus > 0) { |
---|
| 3159 | p1->SetDefinition( aNeutron ); |
---|
| 3160 | NinNucleus--; |
---|
| 3161 | } else if (PinNucleus > 0) { |
---|
| 3162 | p1->SetDefinition( aProton ); |
---|
| 3163 | PinNucleus--; |
---|
| 3164 | } else { |
---|
| 3165 | delete p1; |
---|
| 3166 | break; // no nucleons left in nucleus |
---|
| 3167 | } |
---|
| 3168 | } |
---|
| 3169 | |
---|
| 3170 | vec.SetElement( vecLen, p1 ); |
---|
| 3171 | G4double cost = G4UniformRand() * 2.0 - 1.0; |
---|
| 3172 | G4double sint = std::sqrt(std::fabs(1.0-cost*cost)); |
---|
| 3173 | G4double phi = twopi * G4UniformRand(); |
---|
| 3174 | vec[vecLen]->SetNewlyAdded( true ); |
---|
| 3175 | vec[vecLen]->SetKineticEnergy( kinetic*GeV ); |
---|
| 3176 | kinCreated+=kinetic; |
---|
| 3177 | pp = vec[vecLen]->GetTotalMomentum()/MeV; |
---|
| 3178 | vec[vecLen]->SetMomentum( pp*sint*std::sin(phi)*MeV, |
---|
| 3179 | pp*sint*std::cos(phi)*MeV, |
---|
| 3180 | pp*cost*MeV ); |
---|
| 3181 | vecLen++; |
---|
| 3182 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 3183 | } |
---|
| 3184 | |
---|
| 3185 | if (NinNucleus > 0) { |
---|
| 3186 | if( (atomicWeight >= 10.0) && (ekOriginal <= 2.0*GeV) ) |
---|
| 3187 | { |
---|
| 3188 | G4double ekw = ekOriginal/GeV; |
---|
| 3189 | G4int ika, kk = 0; |
---|
| 3190 | if( ekw > 1.0 )ekw *= ekw; |
---|
| 3191 | ekw = std::max( 0.1, ekw ); |
---|
| 3192 | ika = G4int(ika1*std::exp((atomicNumber*atomicNumber/ |
---|
| 3193 | atomicWeight-ika2)/ika3)/ekw); |
---|
| 3194 | if( ika > 0 ) |
---|
| 3195 | { |
---|
| 3196 | for( i=(vecLen-1); i>=0; --i ) |
---|
| 3197 | { |
---|
| 3198 | if( (vec[i]->GetDefinition() == aProton) && vec[i]->GetNewlyAdded() ) |
---|
| 3199 | { |
---|
| 3200 | vec[i]->SetDefinitionAndUpdateE( aNeutron ); // modified 22-Oct-97 |
---|
| 3201 | PinNucleus++; |
---|
| 3202 | NinNucleus--; |
---|
| 3203 | if( ++kk > ika )break; |
---|
| 3204 | } |
---|
| 3205 | } |
---|
| 3206 | } |
---|
| 3207 | } |
---|
| 3208 | } // if (NinNucleus >0) |
---|
| 3209 | } // if (npnb > 0) |
---|
| 3210 | |
---|
| 3211 | // Next try to add deuterons, tritons and alphas to final state |
---|
| 3212 | |
---|
| 3213 | if (ndta > 0) |
---|
| 3214 | { |
---|
| 3215 | G4double backwardKinetic = 0.0; |
---|
| 3216 | G4int local_ndta=ndta; |
---|
| 3217 | for( i=0; i<ndta; ++i )if( G4UniformRand() < sprob )local_ndta--; |
---|
| 3218 | G4double local_edta = edta; |
---|
| 3219 | if (npnb == 0) local_edta += epnb; // Retrieve unused kinetic energy |
---|
| 3220 | G4double ekin = local_edta/std::max(1,local_ndta); |
---|
| 3221 | |
---|
| 3222 | for( i=0; i<local_ndta; ++i ) |
---|
| 3223 | { |
---|
| 3224 | G4ReactionProduct *p2 = new G4ReactionProduct(); |
---|
| 3225 | if( backwardKinetic > local_edta ) |
---|
| 3226 | { |
---|
| 3227 | delete p2; |
---|
| 3228 | break; |
---|
| 3229 | } |
---|
| 3230 | G4double ran = G4UniformRand(); |
---|
| 3231 | G4double kinetic = -ekin*std::log(ran)-cfa*(1.+0.5*normal()); |
---|
| 3232 | if( kinetic < 0.0 )kinetic = kineticFactor*std::log(ran); |
---|
| 3233 | backwardKinetic += kinetic; |
---|
| 3234 | if( backwardKinetic > local_edta )kinetic = local_edta-(backwardKinetic-kinetic); |
---|
| 3235 | if( kinetic < 0.0 )kinetic = kineticMinimum; |
---|
| 3236 | G4double cost = 2.0*G4UniformRand() - 1.0; |
---|
| 3237 | G4double sint = std::sqrt(std::max(0.0,(1.0-cost*cost))); |
---|
| 3238 | G4double phi = twopi*G4UniformRand(); |
---|
| 3239 | ran = G4UniformRand(); |
---|
| 3240 | if (ran < 0.60) { |
---|
| 3241 | if (PinNucleus > 0 && NinNucleus > 0) { |
---|
| 3242 | p2->SetDefinition( aDeuteron ); |
---|
| 3243 | PinNucleus--; |
---|
| 3244 | NinNucleus--; |
---|
| 3245 | } else if (NinNucleus > 0) { |
---|
| 3246 | p2->SetDefinition( aNeutron ); |
---|
| 3247 | NinNucleus--; |
---|
| 3248 | } else if (PinNucleus > 0) { |
---|
| 3249 | p2->SetDefinition( aProton ); |
---|
| 3250 | PinNucleus--; |
---|
| 3251 | } else { |
---|
| 3252 | delete p2; |
---|
| 3253 | break; |
---|
| 3254 | } |
---|
| 3255 | } else if (ran < 0.90) { |
---|
| 3256 | if (PinNucleus > 0 && NinNucleus > 1) { |
---|
| 3257 | p2->SetDefinition( aTriton ); |
---|
| 3258 | PinNucleus--; |
---|
| 3259 | NinNucleus -= 2; |
---|
| 3260 | } else if (PinNucleus > 0 && NinNucleus > 0) { |
---|
| 3261 | p2->SetDefinition( aDeuteron ); |
---|
| 3262 | PinNucleus--; |
---|
| 3263 | NinNucleus--; |
---|
| 3264 | } else if (NinNucleus > 0) { |
---|
| 3265 | p2->SetDefinition( aNeutron ); |
---|
| 3266 | NinNucleus--; |
---|
| 3267 | } else if (PinNucleus > 0) { |
---|
| 3268 | p2->SetDefinition( aProton ); |
---|
| 3269 | PinNucleus--; |
---|
| 3270 | } else { |
---|
| 3271 | delete p2; |
---|
| 3272 | break; |
---|
| 3273 | } |
---|
| 3274 | } else { |
---|
| 3275 | if (PinNucleus > 1 && NinNucleus > 1) { |
---|
| 3276 | p2->SetDefinition( anAlpha ); |
---|
| 3277 | PinNucleus -= 2; |
---|
| 3278 | NinNucleus -= 2; |
---|
| 3279 | } else if (PinNucleus > 0 && NinNucleus > 1) { |
---|
| 3280 | p2->SetDefinition( aTriton ); |
---|
| 3281 | PinNucleus--; |
---|
| 3282 | NinNucleus -= 2; |
---|
| 3283 | } else if (PinNucleus > 0 && NinNucleus > 0) { |
---|
| 3284 | p2->SetDefinition( aDeuteron ); |
---|
| 3285 | PinNucleus--; |
---|
| 3286 | NinNucleus--; |
---|
| 3287 | } else if (NinNucleus > 0) { |
---|
| 3288 | p2->SetDefinition( aNeutron ); |
---|
| 3289 | NinNucleus--; |
---|
| 3290 | } else if (PinNucleus > 0) { |
---|
| 3291 | p2->SetDefinition( aProton ); |
---|
| 3292 | PinNucleus--; |
---|
| 3293 | } else { |
---|
| 3294 | delete p2; |
---|
| 3295 | break; |
---|
| 3296 | } |
---|
| 3297 | } |
---|
| 3298 | |
---|
| 3299 | vec.SetElement( vecLen, p2 ); |
---|
| 3300 | vec[vecLen]->SetNewlyAdded( true ); |
---|
| 3301 | vec[vecLen]->SetKineticEnergy( kinetic*GeV ); |
---|
| 3302 | kinCreated+=kinetic; |
---|
| 3303 | pp = vec[vecLen]->GetTotalMomentum()/MeV; |
---|
| 3304 | vec[vecLen++]->SetMomentum( pp*sint*std::sin(phi)*MeV, |
---|
| 3305 | pp*sint*std::cos(phi)*MeV, |
---|
| 3306 | pp*cost*MeV ); |
---|
| 3307 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 3308 | } |
---|
| 3309 | } // if (ndta > 0) |
---|
| 3310 | |
---|
| 3311 | // G4double delta = epnb+edta - kinCreated; |
---|
| 3312 | } |
---|
| 3313 | |
---|
| 3314 | |
---|
| 3315 | std::pair<G4int, G4int> G4ReactionDynamics::GetFinalStateNucleons( |
---|
| 3316 | const G4DynamicParticle* originalTarget, |
---|
| 3317 | const G4FastVector<G4ReactionProduct,GHADLISTSIZE>& vec, |
---|
| 3318 | const G4int& vecLen) |
---|
| 3319 | { |
---|
| 3320 | // Get number of protons and neutrons removed from the target nucleus |
---|
| 3321 | |
---|
| 3322 | G4int protonsRemoved = 0; |
---|
| 3323 | G4int neutronsRemoved = 0; |
---|
| 3324 | if (originalTarget->GetDefinition()->GetParticleName() == "proton") |
---|
| 3325 | protonsRemoved++; |
---|
| 3326 | else |
---|
| 3327 | neutronsRemoved++; |
---|
| 3328 | |
---|
| 3329 | G4String secName; |
---|
| 3330 | for (G4int i = 0; i < vecLen; i++) { |
---|
| 3331 | secName = vec[i]->GetDefinition()->GetParticleName(); |
---|
| 3332 | if (secName == "proton") { |
---|
| 3333 | protonsRemoved++; |
---|
| 3334 | } else if (secName == "neutron") { |
---|
| 3335 | neutronsRemoved++; |
---|
| 3336 | } else if (secName == "anti_proton") { |
---|
| 3337 | protonsRemoved--; |
---|
| 3338 | } else if (secName == "anti_neutron") { |
---|
| 3339 | neutronsRemoved--; |
---|
| 3340 | } |
---|
| 3341 | } |
---|
| 3342 | |
---|
| 3343 | return std::pair<G4int, G4int>(protonsRemoved, neutronsRemoved); |
---|
| 3344 | } |
---|
| 3345 | |
---|
| 3346 | |
---|
| 3347 | void G4ReactionDynamics::MomentumCheck( |
---|
| 3348 | const G4ReactionProduct &modifiedOriginal, |
---|
| 3349 | G4ReactionProduct ¤tParticle, |
---|
| 3350 | G4ReactionProduct &targetParticle, |
---|
| 3351 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
| 3352 | G4int &vecLen ) |
---|
| 3353 | { |
---|
| 3354 | const G4double pOriginal = modifiedOriginal.GetTotalMomentum()/MeV; |
---|
| 3355 | G4double testMomentum = currentParticle.GetMomentum().mag()/MeV; |
---|
| 3356 | G4double pMass; |
---|
| 3357 | if( testMomentum >= pOriginal ) |
---|
| 3358 | { |
---|
| 3359 | pMass = currentParticle.GetMass()/MeV; |
---|
| 3360 | currentParticle.SetTotalEnergy( |
---|
| 3361 | std::sqrt( pMass*pMass + pOriginal*pOriginal )*MeV ); |
---|
| 3362 | currentParticle.SetMomentum( |
---|
| 3363 | currentParticle.GetMomentum() * (pOriginal/testMomentum) ); |
---|
| 3364 | } |
---|
| 3365 | testMomentum = targetParticle.GetMomentum().mag()/MeV; |
---|
| 3366 | if( testMomentum >= pOriginal ) |
---|
| 3367 | { |
---|
| 3368 | pMass = targetParticle.GetMass()/MeV; |
---|
| 3369 | targetParticle.SetTotalEnergy( |
---|
| 3370 | std::sqrt( pMass*pMass + pOriginal*pOriginal )*MeV ); |
---|
| 3371 | targetParticle.SetMomentum( |
---|
| 3372 | targetParticle.GetMomentum() * (pOriginal/testMomentum) ); |
---|
| 3373 | } |
---|
| 3374 | for( G4int i=0; i<vecLen; ++i ) |
---|
| 3375 | { |
---|
| 3376 | testMomentum = vec[i]->GetMomentum().mag()/MeV; |
---|
| 3377 | if( testMomentum >= pOriginal ) |
---|
| 3378 | { |
---|
| 3379 | pMass = vec[i]->GetMass()/MeV; |
---|
| 3380 | vec[i]->SetTotalEnergy( |
---|
| 3381 | std::sqrt( pMass*pMass + pOriginal*pOriginal )*MeV ); |
---|
| 3382 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pOriginal/testMomentum) ); |
---|
| 3383 | } |
---|
| 3384 | } |
---|
| 3385 | } |
---|
| 3386 | |
---|
| 3387 | void G4ReactionDynamics::ProduceStrangeParticlePairs( |
---|
| 3388 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
| 3389 | G4int &vecLen, |
---|
| 3390 | const G4ReactionProduct &modifiedOriginal, |
---|
| 3391 | const G4DynamicParticle *originalTarget, |
---|
| 3392 | G4ReactionProduct ¤tParticle, |
---|
| 3393 | G4ReactionProduct &targetParticle, |
---|
| 3394 | G4bool &incidentHasChanged, |
---|
| 3395 | G4bool &targetHasChanged ) |
---|
| 3396 | { |
---|
| 3397 | // derived from original FORTRAN code STPAIR by H. Fesefeldt (16-Dec-1987) |
---|
| 3398 | // |
---|
| 3399 | // Choose charge combinations K+ K-, K+ K0B, K0 K0B, K0 K-, |
---|
| 3400 | // K+ Y0, K0 Y+, K0 Y- |
---|
| 3401 | // For antibaryon induced reactions half of the cross sections KB YB |
---|
| 3402 | // pairs are produced. Charge is not conserved, no experimental data available |
---|
| 3403 | // for exclusive reactions, therefore some average behaviour assumed. |
---|
| 3404 | // The ratio L/SIGMA is taken as 3:1 (from experimental low energy) |
---|
| 3405 | // |
---|
| 3406 | if( vecLen == 0 )return; |
---|
| 3407 | // |
---|
| 3408 | // the following protects against annihilation processes |
---|
| 3409 | // |
---|
| 3410 | if( currentParticle.GetMass() == 0.0 || targetParticle.GetMass() == 0.0 )return; |
---|
| 3411 | |
---|
| 3412 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
---|
| 3413 | const G4double mOriginal = modifiedOriginal.GetDefinition()->GetPDGMass()/GeV; |
---|
| 3414 | G4double targetMass = originalTarget->GetDefinition()->GetPDGMass()/GeV; |
---|
| 3415 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
---|
| 3416 | targetMass*targetMass + |
---|
| 3417 | 2.0*targetMass*etOriginal ); // GeV |
---|
| 3418 | G4double currentMass = currentParticle.GetMass()/GeV; |
---|
| 3419 | G4double availableEnergy = centerofmassEnergy-(targetMass+currentMass); |
---|
| 3420 | if( availableEnergy <= 1.0 )return; |
---|
| 3421 | |
---|
| 3422 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
| 3423 | G4ParticleDefinition *anAntiProton = G4AntiProton::AntiProton(); |
---|
| 3424 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
| 3425 | G4ParticleDefinition *anAntiNeutron = G4AntiNeutron::AntiNeutron(); |
---|
| 3426 | G4ParticleDefinition *aSigmaMinus = G4SigmaMinus::SigmaMinus(); |
---|
| 3427 | G4ParticleDefinition *aSigmaPlus = G4SigmaPlus::SigmaPlus(); |
---|
| 3428 | G4ParticleDefinition *aSigmaZero = G4SigmaZero::SigmaZero(); |
---|
| 3429 | G4ParticleDefinition *anAntiSigmaMinus = G4AntiSigmaMinus::AntiSigmaMinus(); |
---|
| 3430 | G4ParticleDefinition *anAntiSigmaPlus = G4AntiSigmaPlus::AntiSigmaPlus(); |
---|
| 3431 | G4ParticleDefinition *anAntiSigmaZero = G4AntiSigmaZero::AntiSigmaZero(); |
---|
| 3432 | G4ParticleDefinition *aKaonMinus = G4KaonMinus::KaonMinus(); |
---|
| 3433 | G4ParticleDefinition *aKaonPlus = G4KaonPlus::KaonPlus(); |
---|
| 3434 | G4ParticleDefinition *aKaonZL = G4KaonZeroLong::KaonZeroLong(); |
---|
| 3435 | G4ParticleDefinition *aKaonZS = G4KaonZeroShort::KaonZeroShort(); |
---|
| 3436 | G4ParticleDefinition *aLambda = G4Lambda::Lambda(); |
---|
| 3437 | G4ParticleDefinition *anAntiLambda = G4AntiLambda::AntiLambda(); |
---|
| 3438 | |
---|
| 3439 | const G4double protonMass = aProton->GetPDGMass()/GeV; |
---|
| 3440 | const G4double sigmaMinusMass = aSigmaMinus->GetPDGMass()/GeV; |
---|
| 3441 | // |
---|
| 3442 | // determine the center of mass energy bin |
---|
| 3443 | // |
---|
| 3444 | const G4double avrs[] = {3.,4.,5.,6.,7.,8.,9.,10.,20.,30.,40.,50.}; |
---|
| 3445 | |
---|
| 3446 | G4int ibin, i3, i4; |
---|
| 3447 | G4double avk, avy, avn, ran; |
---|
| 3448 | G4int i = 1; |
---|
| 3449 | while( (i<12) && (centerofmassEnergy>avrs[i]) )++i; |
---|
| 3450 | if( i == 12 ) |
---|
| 3451 | ibin = 11; |
---|
| 3452 | else |
---|
| 3453 | ibin = i; |
---|
| 3454 | // |
---|
| 3455 | // the fortran code chooses a random replacement of produced kaons |
---|
| 3456 | // but does not take into account charge conservation |
---|
| 3457 | // |
---|
| 3458 | if( vecLen == 1 ) // we know that vecLen > 0 |
---|
| 3459 | { |
---|
| 3460 | i3 = 0; |
---|
| 3461 | i4 = 1; // note that we will be adding a new secondary particle in this case only |
---|
| 3462 | } |
---|
| 3463 | else // otherwise 0 <= i3,i4 < vecLen |
---|
| 3464 | { |
---|
| 3465 | G4double ran = G4UniformRand(); |
---|
| 3466 | while( ran == 1.0 )ran = G4UniformRand(); |
---|
| 3467 | i4 = i3 = G4int( vecLen*ran ); |
---|
| 3468 | while( i3 == i4 ) |
---|
| 3469 | { |
---|
| 3470 | ran = G4UniformRand(); |
---|
| 3471 | while( ran == 1.0 )ran = G4UniformRand(); |
---|
| 3472 | i4 = G4int( vecLen*ran ); |
---|
| 3473 | } |
---|
| 3474 | } |
---|
| 3475 | // |
---|
| 3476 | // use linear interpolation or extrapolation by y=centerofmassEnergy*x+b |
---|
| 3477 | // |
---|
| 3478 | const G4double avkkb[] = { 0.0015, 0.005, 0.012, 0.0285, 0.0525, 0.075, |
---|
| 3479 | 0.0975, 0.123, 0.28, 0.398, 0.495, 0.573 }; |
---|
| 3480 | const G4double avky[] = { 0.005, 0.03, 0.064, 0.095, 0.115, 0.13, |
---|
| 3481 | 0.145, 0.155, 0.20, 0.205, 0.210, 0.212 }; |
---|
| 3482 | const G4double avnnb[] = { 0.00001, 0.0001, 0.0006, 0.0025, 0.01, 0.02, |
---|
| 3483 | 0.04, 0.05, 0.12, 0.15, 0.18, 0.20 }; |
---|
| 3484 | |
---|
| 3485 | avk = (std::log(avkkb[ibin])-std::log(avkkb[ibin-1]))*(centerofmassEnergy-avrs[ibin-1]) |
---|
| 3486 | /(avrs[ibin]-avrs[ibin-1]) + std::log(avkkb[ibin-1]); |
---|
| 3487 | avk = std::exp(avk); |
---|
| 3488 | |
---|
| 3489 | avy = (std::log(avky[ibin])-std::log(avky[ibin-1]))*(centerofmassEnergy-avrs[ibin-1]) |
---|
| 3490 | /(avrs[ibin]-avrs[ibin-1]) + std::log(avky[ibin-1]); |
---|
| 3491 | avy = std::exp(avy); |
---|
| 3492 | |
---|
| 3493 | avn = (std::log(avnnb[ibin])-std::log(avnnb[ibin-1]))*(centerofmassEnergy-avrs[ibin-1]) |
---|
| 3494 | /(avrs[ibin]-avrs[ibin-1]) + std::log(avnnb[ibin-1]); |
---|
| 3495 | avn = std::exp(avn); |
---|
| 3496 | |
---|
| 3497 | if( avk+avy+avn <= 0.0 )return; |
---|
| 3498 | |
---|
| 3499 | if( currentMass < protonMass )avy /= 2.0; |
---|
| 3500 | if( targetMass < protonMass )avy = 0.0; |
---|
| 3501 | avy += avk+avn; |
---|
| 3502 | avk += avn; |
---|
| 3503 | ran = G4UniformRand(); |
---|
| 3504 | if( ran < avn ) |
---|
| 3505 | { |
---|
| 3506 | if( availableEnergy < 2.0 )return; |
---|
| 3507 | if( vecLen == 1 ) // add a new secondary |
---|
| 3508 | { |
---|
| 3509 | G4ReactionProduct *p1 = new G4ReactionProduct; |
---|
| 3510 | if( G4UniformRand() < 0.5 ) |
---|
| 3511 | { |
---|
| 3512 | vec[0]->SetDefinition( aNeutron ); |
---|
| 3513 | p1->SetDefinition( anAntiNeutron ); |
---|
| 3514 | (G4UniformRand() < 0.5) ? p1->SetSide( -1 ) : p1->SetSide( 1 ); |
---|
| 3515 | vec[0]->SetMayBeKilled(false); |
---|
| 3516 | p1->SetMayBeKilled(false); |
---|
| 3517 | } |
---|
| 3518 | else |
---|
| 3519 | { |
---|
| 3520 | vec[0]->SetDefinition( aProton ); |
---|
| 3521 | p1->SetDefinition( anAntiProton ); |
---|
| 3522 | (G4UniformRand() < 0.5) ? p1->SetSide( -1 ) : p1->SetSide( 1 ); |
---|
| 3523 | vec[0]->SetMayBeKilled(false); |
---|
| 3524 | p1->SetMayBeKilled(false); |
---|
| 3525 | } |
---|
| 3526 | vec.SetElement( vecLen++, p1 ); |
---|
| 3527 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 3528 | } |
---|
| 3529 | else |
---|
| 3530 | { // replace two secondaries |
---|
| 3531 | if( G4UniformRand() < 0.5 ) |
---|
| 3532 | { |
---|
| 3533 | vec[i3]->SetDefinition( aNeutron ); |
---|
| 3534 | vec[i4]->SetDefinition( anAntiNeutron ); |
---|
| 3535 | vec[i3]->SetMayBeKilled(false); |
---|
| 3536 | vec[i4]->SetMayBeKilled(false); |
---|
| 3537 | } |
---|
| 3538 | else |
---|
| 3539 | { |
---|
| 3540 | vec[i3]->SetDefinition( aProton ); |
---|
| 3541 | vec[i4]->SetDefinition( anAntiProton ); |
---|
| 3542 | vec[i3]->SetMayBeKilled(false); |
---|
| 3543 | vec[i4]->SetMayBeKilled(false); |
---|
| 3544 | } |
---|
| 3545 | } |
---|
| 3546 | } |
---|
| 3547 | else if( ran < avk ) |
---|
| 3548 | { |
---|
| 3549 | if( availableEnergy < 1.0 )return; |
---|
| 3550 | |
---|
| 3551 | const G4double kkb[] = { 0.2500, 0.3750, 0.5000, 0.5625, 0.6250, |
---|
| 3552 | 0.6875, 0.7500, 0.8750, 1.000 }; |
---|
| 3553 | const G4int ipakkb1[] = { 10, 10, 10, 11, 11, 12, 12, 11, 12 }; |
---|
| 3554 | const G4int ipakkb2[] = { 13, 11, 12, 11, 12, 11, 12, 13, 13 }; |
---|
| 3555 | ran = G4UniformRand(); |
---|
| 3556 | i = 0; |
---|
| 3557 | while( (i<9) && (ran>=kkb[i]) )++i; |
---|
| 3558 | if( i == 9 )return; |
---|
| 3559 | // |
---|
| 3560 | // ipakkb[] = { 10,13, 10,11, 10,12, 11,11, 11,12, 12,11, 12,12, 11,13, 12,13 }; |
---|
| 3561 | // charge + - + 0 + 0 0 0 0 0 0 0 0 0 0 - 0 - |
---|
| 3562 | // |
---|
| 3563 | switch( ipakkb1[i] ) |
---|
| 3564 | { |
---|
| 3565 | case 10: |
---|
| 3566 | vec[i3]->SetDefinition( aKaonPlus ); |
---|
| 3567 | vec[i3]->SetMayBeKilled(false); |
---|
| 3568 | break; |
---|
| 3569 | case 11: |
---|
| 3570 | vec[i3]->SetDefinition( aKaonZS ); |
---|
| 3571 | vec[i3]->SetMayBeKilled(false); |
---|
| 3572 | break; |
---|
| 3573 | case 12: |
---|
| 3574 | vec[i3]->SetDefinition( aKaonZL ); |
---|
| 3575 | vec[i3]->SetMayBeKilled(false); |
---|
| 3576 | break; |
---|
| 3577 | } |
---|
| 3578 | if( vecLen == 1 ) // add a secondary |
---|
| 3579 | { |
---|
| 3580 | G4ReactionProduct *p1 = new G4ReactionProduct; |
---|
| 3581 | switch( ipakkb2[i] ) |
---|
| 3582 | { |
---|
| 3583 | case 11: |
---|
| 3584 | p1->SetDefinition( aKaonZS ); |
---|
| 3585 | p1->SetMayBeKilled(false); |
---|
| 3586 | break; |
---|
| 3587 | case 12: |
---|
| 3588 | p1->SetDefinition( aKaonZL ); |
---|
| 3589 | p1->SetMayBeKilled(false); |
---|
| 3590 | break; |
---|
| 3591 | case 13: |
---|
| 3592 | p1->SetDefinition( aKaonMinus ); |
---|
| 3593 | p1->SetMayBeKilled(false); |
---|
| 3594 | break; |
---|
| 3595 | } |
---|
| 3596 | (G4UniformRand() < 0.5) ? p1->SetSide( -1 ) : p1->SetSide( 1 ); |
---|
| 3597 | vec.SetElement( vecLen++, p1 ); |
---|
| 3598 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 3599 | } |
---|
| 3600 | else // replace |
---|
| 3601 | { |
---|
| 3602 | switch( ipakkb2[i] ) |
---|
| 3603 | { |
---|
| 3604 | case 11: |
---|
| 3605 | vec[i4]->SetDefinition( aKaonZS ); |
---|
| 3606 | vec[i4]->SetMayBeKilled(false); |
---|
| 3607 | break; |
---|
| 3608 | case 12: |
---|
| 3609 | vec[i4]->SetDefinition( aKaonZL ); |
---|
| 3610 | vec[i4]->SetMayBeKilled(false); |
---|
| 3611 | break; |
---|
| 3612 | case 13: |
---|
| 3613 | vec[i4]->SetDefinition( aKaonMinus ); |
---|
| 3614 | vec[i4]->SetMayBeKilled(false); |
---|
| 3615 | break; |
---|
| 3616 | } |
---|
| 3617 | } |
---|
| 3618 | } |
---|
| 3619 | else if( ran < avy ) |
---|
| 3620 | { |
---|
| 3621 | if( availableEnergy < 1.6 )return; |
---|
| 3622 | |
---|
| 3623 | const G4double ky[] = { 0.200, 0.300, 0.400, 0.550, 0.625, 0.700, |
---|
| 3624 | 0.800, 0.850, 0.900, 0.950, 0.975, 1.000 }; |
---|
| 3625 | const G4int ipaky1[] = { 18, 18, 18, 20, 20, 20, 21, 21, 21, 22, 22, 22 }; |
---|
| 3626 | const G4int ipaky2[] = { 10, 11, 12, 10, 11, 12, 10, 11, 12, 10, 11, 12 }; |
---|
| 3627 | const G4int ipakyb1[] = { 19, 19, 19, 23, 23, 23, 24, 24, 24, 25, 25, 25 }; |
---|
| 3628 | const G4int ipakyb2[] = { 13, 12, 11, 13, 12, 11, 13, 12, 11, 13, 12, 11 }; |
---|
| 3629 | ran = G4UniformRand(); |
---|
| 3630 | i = 0; |
---|
| 3631 | while( (i<12) && (ran>ky[i]) )++i; |
---|
| 3632 | if( i == 12 )return; |
---|
| 3633 | if( (currentMass<protonMass) || (G4UniformRand()<0.5) ) |
---|
| 3634 | { |
---|
| 3635 | // ipaky[] = { 18,10, 18,11, 18,12, 20,10, 20,11, 20,12, |
---|
| 3636 | // 0 + 0 0 0 0 + + + 0 + 0 |
---|
| 3637 | // |
---|
| 3638 | // 21,10, 21,11, 21,12, 22,10, 22,11, 22,12 } |
---|
| 3639 | // 0 + 0 0 0 0 - + - 0 - 0 |
---|
| 3640 | switch( ipaky1[i] ) |
---|
| 3641 | { |
---|
| 3642 | case 18: |
---|
| 3643 | targetParticle.SetDefinition( aLambda ); |
---|
| 3644 | break; |
---|
| 3645 | case 20: |
---|
| 3646 | targetParticle.SetDefinition( aSigmaPlus ); |
---|
| 3647 | break; |
---|
| 3648 | case 21: |
---|
| 3649 | targetParticle.SetDefinition( aSigmaZero ); |
---|
| 3650 | break; |
---|
| 3651 | case 22: |
---|
| 3652 | targetParticle.SetDefinition( aSigmaMinus ); |
---|
| 3653 | break; |
---|
| 3654 | } |
---|
| 3655 | targetHasChanged = true; |
---|
| 3656 | switch( ipaky2[i] ) |
---|
| 3657 | { |
---|
| 3658 | case 10: |
---|
| 3659 | vec[i3]->SetDefinition( aKaonPlus ); |
---|
| 3660 | vec[i3]->SetMayBeKilled(false); |
---|
| 3661 | break; |
---|
| 3662 | case 11: |
---|
| 3663 | vec[i3]->SetDefinition( aKaonZS ); |
---|
| 3664 | vec[i3]->SetMayBeKilled(false); |
---|
| 3665 | break; |
---|
| 3666 | case 12: |
---|
| 3667 | vec[i3]->SetDefinition( aKaonZL ); |
---|
| 3668 | vec[i3]->SetMayBeKilled(false); |
---|
| 3669 | break; |
---|
| 3670 | } |
---|
| 3671 | } |
---|
| 3672 | else // (currentMass >= protonMass) && (G4UniformRand() >= 0.5) |
---|
| 3673 | { |
---|
| 3674 | // ipakyb[] = { 19,13, 19,12, 19,11, 23,13, 23,12, 23,11, |
---|
| 3675 | // 24,13, 24,12, 24,11, 25,13, 25,12, 25,11 }; |
---|
| 3676 | if( (currentParticle.GetDefinition() == anAntiProton) || |
---|
| 3677 | (currentParticle.GetDefinition() == anAntiNeutron) || |
---|
| 3678 | (currentParticle.GetDefinition() == anAntiLambda) || |
---|
| 3679 | (currentMass > sigmaMinusMass) ) |
---|
| 3680 | { |
---|
| 3681 | switch( ipakyb1[i] ) |
---|
| 3682 | { |
---|
| 3683 | case 19: |
---|
| 3684 | currentParticle.SetDefinitionAndUpdateE( anAntiLambda ); |
---|
| 3685 | break; |
---|
| 3686 | case 23: |
---|
| 3687 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaPlus ); |
---|
| 3688 | break; |
---|
| 3689 | case 24: |
---|
| 3690 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaZero ); |
---|
| 3691 | break; |
---|
| 3692 | case 25: |
---|
| 3693 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaMinus ); |
---|
| 3694 | break; |
---|
| 3695 | } |
---|
| 3696 | incidentHasChanged = true; |
---|
| 3697 | switch( ipakyb2[i] ) |
---|
| 3698 | { |
---|
| 3699 | case 11: |
---|
| 3700 | vec[i3]->SetDefinition( aKaonZS ); |
---|
| 3701 | vec[i3]->SetMayBeKilled(false); |
---|
| 3702 | break; |
---|
| 3703 | case 12: |
---|
| 3704 | vec[i3]->SetDefinition( aKaonZL ); |
---|
| 3705 | vec[i3]->SetMayBeKilled(false); |
---|
| 3706 | break; |
---|
| 3707 | case 13: |
---|
| 3708 | vec[i3]->SetDefinition( aKaonMinus ); |
---|
| 3709 | vec[i3]->SetMayBeKilled(false); |
---|
| 3710 | break; |
---|
| 3711 | } |
---|
| 3712 | } |
---|
| 3713 | else |
---|
| 3714 | { |
---|
| 3715 | switch( ipaky1[i] ) |
---|
| 3716 | { |
---|
| 3717 | case 18: |
---|
| 3718 | currentParticle.SetDefinitionAndUpdateE( aLambda ); |
---|
| 3719 | break; |
---|
| 3720 | case 20: |
---|
| 3721 | currentParticle.SetDefinitionAndUpdateE( aSigmaPlus ); |
---|
| 3722 | break; |
---|
| 3723 | case 21: |
---|
| 3724 | currentParticle.SetDefinitionAndUpdateE( aSigmaZero ); |
---|
| 3725 | break; |
---|
| 3726 | case 22: |
---|
| 3727 | currentParticle.SetDefinitionAndUpdateE( aSigmaMinus ); |
---|
| 3728 | break; |
---|
| 3729 | } |
---|
| 3730 | incidentHasChanged = true; |
---|
| 3731 | switch( ipaky2[i] ) |
---|
| 3732 | { |
---|
| 3733 | case 10: |
---|
| 3734 | vec[i3]->SetDefinition( aKaonPlus ); |
---|
| 3735 | vec[i3]->SetMayBeKilled(false); |
---|
| 3736 | break; |
---|
| 3737 | case 11: |
---|
| 3738 | vec[i3]->SetDefinition( aKaonZS ); |
---|
| 3739 | vec[i3]->SetMayBeKilled(false); |
---|
| 3740 | break; |
---|
| 3741 | case 12: |
---|
| 3742 | vec[i3]->SetDefinition( aKaonZL ); |
---|
| 3743 | vec[i3]->SetMayBeKilled(false); |
---|
| 3744 | break; |
---|
| 3745 | } |
---|
| 3746 | } |
---|
| 3747 | } |
---|
| 3748 | } |
---|
| 3749 | else return; |
---|
| 3750 | // |
---|
| 3751 | // check the available energy |
---|
| 3752 | // if there is not enough energy for kkb/ky pair production |
---|
| 3753 | // then reduce the number of secondary particles |
---|
| 3754 | // NOTE: |
---|
| 3755 | // the number of secondaries may have been changed |
---|
| 3756 | // the incident and/or target particles may have changed |
---|
| 3757 | // charge conservation is ignored (as well as strangness conservation) |
---|
| 3758 | // |
---|
| 3759 | currentMass = currentParticle.GetMass()/GeV; |
---|
| 3760 | targetMass = targetParticle.GetMass()/GeV; |
---|
| 3761 | |
---|
| 3762 | G4double energyCheck = centerofmassEnergy-(currentMass+targetMass); |
---|
| 3763 | for( i=0; i<vecLen; ++i ) |
---|
| 3764 | { |
---|
| 3765 | energyCheck -= vec[i]->GetMass()/GeV; |
---|
| 3766 | if( energyCheck < 0.0 ) // chop off the secondary List |
---|
| 3767 | { |
---|
| 3768 | vecLen = std::max( 0, --i ); // looks like a memory leak @@@@@@@@@@@@ |
---|
| 3769 | G4int j; |
---|
| 3770 | for(j=i; j<vecLen; j++) delete vec[j]; |
---|
| 3771 | break; |
---|
| 3772 | } |
---|
| 3773 | } |
---|
| 3774 | return; |
---|
| 3775 | } |
---|
| 3776 | |
---|
| 3777 | void |
---|
| 3778 | G4ReactionDynamics::NuclearReaction( |
---|
| 3779 | G4FastVector<G4ReactionProduct,4> &vec, |
---|
| 3780 | G4int &vecLen, |
---|
| 3781 | const G4HadProjectile *originalIncident, |
---|
| 3782 | const G4Nucleus &targetNucleus, |
---|
| 3783 | const G4double theAtomicMass, |
---|
| 3784 | const G4double *mass ) |
---|
| 3785 | { |
---|
| 3786 | // derived from original FORTRAN code NUCREC by H. Fesefeldt (12-Feb-1987) |
---|
| 3787 | // |
---|
| 3788 | // Nuclear reaction kinematics at low energies |
---|
| 3789 | // |
---|
| 3790 | G4ParticleDefinition *aGamma = G4Gamma::Gamma(); |
---|
| 3791 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
| 3792 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
| 3793 | G4ParticleDefinition *aDeuteron = G4Deuteron::Deuteron(); |
---|
| 3794 | G4ParticleDefinition *aTriton = G4Triton::Triton(); |
---|
| 3795 | G4ParticleDefinition *anAlpha = G4Alpha::Alpha(); |
---|
| 3796 | |
---|
| 3797 | const G4double aProtonMass = aProton->GetPDGMass()/MeV; |
---|
| 3798 | const G4double aNeutronMass = aNeutron->GetPDGMass()/MeV; |
---|
| 3799 | const G4double aDeuteronMass = aDeuteron->GetPDGMass()/MeV; |
---|
| 3800 | const G4double aTritonMass = aTriton->GetPDGMass()/MeV; |
---|
| 3801 | const G4double anAlphaMass = anAlpha->GetPDGMass()/MeV; |
---|
| 3802 | |
---|
| 3803 | G4ReactionProduct currentParticle; |
---|
| 3804 | currentParticle = *originalIncident; |
---|
| 3805 | // |
---|
| 3806 | // Set beam particle, take kinetic energy of current particle as the |
---|
| 3807 | // fundamental quantity. Due to the difficult kinematic, all masses have to |
---|
| 3808 | // be assigned the best measured values |
---|
| 3809 | // |
---|
| 3810 | G4double p = currentParticle.GetTotalMomentum(); |
---|
| 3811 | G4double pp = currentParticle.GetMomentum().mag(); |
---|
| 3812 | if( pp <= 0.001*MeV ) |
---|
| 3813 | { |
---|
| 3814 | G4double phinve = twopi*G4UniformRand(); |
---|
| 3815 | G4double rthnve = std::acos( std::max( -1.0, std::min( 1.0, -1.0 + 2.0*G4UniformRand() ) ) ); |
---|
| 3816 | currentParticle.SetMomentum( p*std::sin(rthnve)*std::cos(phinve), |
---|
| 3817 | p*std::sin(rthnve)*std::sin(phinve), |
---|
| 3818 | p*std::cos(rthnve) ); |
---|
| 3819 | } |
---|
| 3820 | else |
---|
| 3821 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (p/pp) ); |
---|
| 3822 | // |
---|
| 3823 | // calculate Q-value of reactions |
---|
| 3824 | // |
---|
| 3825 | G4double currentKinetic = currentParticle.GetKineticEnergy()/MeV; |
---|
| 3826 | G4double currentMass = currentParticle.GetDefinition()->GetPDGMass()/MeV; |
---|
| 3827 | G4double qv = currentKinetic + theAtomicMass + currentMass; |
---|
| 3828 | |
---|
| 3829 | G4double qval[9]; |
---|
| 3830 | qval[0] = qv - mass[0]; |
---|
| 3831 | qval[1] = qv - mass[1] - aNeutronMass; |
---|
| 3832 | qval[2] = qv - mass[2] - aProtonMass; |
---|
| 3833 | qval[3] = qv - mass[3] - aDeuteronMass; |
---|
| 3834 | qval[4] = qv - mass[4] - aTritonMass; |
---|
| 3835 | qval[5] = qv - mass[5] - anAlphaMass; |
---|
| 3836 | qval[6] = qv - mass[6] - aNeutronMass - aNeutronMass; |
---|
| 3837 | qval[7] = qv - mass[7] - aNeutronMass - aProtonMass; |
---|
| 3838 | qval[8] = qv - mass[8] - aProtonMass - aProtonMass; |
---|
| 3839 | |
---|
| 3840 | if( currentParticle.GetDefinition() == aNeutron ) |
---|
| 3841 | { |
---|
| 3842 | const G4double A = targetNucleus.GetN(); // atomic weight |
---|
| 3843 | if( G4UniformRand() > ((A-1.0)/230.0)*((A-1.0)/230.0) ) |
---|
| 3844 | qval[0] = 0.0; |
---|
| 3845 | if( G4UniformRand() >= currentKinetic/7.9254*A ) |
---|
| 3846 | qval[2] = qval[3] = qval[4] = qval[5] = qval[8] = 0.0; |
---|
| 3847 | } |
---|
| 3848 | else |
---|
| 3849 | qval[0] = 0.0; |
---|
| 3850 | |
---|
| 3851 | G4int i; |
---|
| 3852 | qv = 0.0; |
---|
| 3853 | for( i=0; i<9; ++i ) |
---|
| 3854 | { |
---|
| 3855 | if( mass[i] < 500.0*MeV )qval[i] = 0.0; |
---|
| 3856 | if( qval[i] < 0.0 )qval[i] = 0.0; |
---|
| 3857 | qv += qval[i]; |
---|
| 3858 | } |
---|
| 3859 | G4double qv1 = 0.0; |
---|
| 3860 | G4double ran = G4UniformRand(); |
---|
| 3861 | G4int index; |
---|
| 3862 | for( index=0; index<9; ++index ) |
---|
| 3863 | { |
---|
| 3864 | if( qval[index] > 0.0 ) |
---|
| 3865 | { |
---|
| 3866 | qv1 += qval[index]/qv; |
---|
| 3867 | if( ran <= qv1 )break; |
---|
| 3868 | } |
---|
| 3869 | } |
---|
| 3870 | if( index == 9 ) // loop continued to the end |
---|
| 3871 | { |
---|
| 3872 | throw G4HadronicException(__FILE__, __LINE__, |
---|
| 3873 | "G4ReactionDynamics::NuclearReaction: inelastic reaction kinematically not possible"); |
---|
| 3874 | } |
---|
| 3875 | G4double ke = currentParticle.GetKineticEnergy()/GeV; |
---|
| 3876 | G4int nt = 2; |
---|
| 3877 | if( (index>=6) || (G4UniformRand()<std::min(0.5,ke*10.0)) )nt = 3; |
---|
| 3878 | |
---|
| 3879 | G4ReactionProduct **v = new G4ReactionProduct * [3]; |
---|
| 3880 | v[0] = new G4ReactionProduct; |
---|
| 3881 | v[1] = new G4ReactionProduct; |
---|
| 3882 | v[2] = new G4ReactionProduct; |
---|
| 3883 | |
---|
| 3884 | v[0]->SetMass( mass[index]*MeV ); |
---|
| 3885 | switch( index ) |
---|
| 3886 | { |
---|
| 3887 | case 0: |
---|
| 3888 | v[1]->SetDefinition( aGamma ); |
---|
| 3889 | v[2]->SetDefinition( aGamma ); |
---|
| 3890 | break; |
---|
| 3891 | case 1: |
---|
| 3892 | v[1]->SetDefinition( aNeutron ); |
---|
| 3893 | v[2]->SetDefinition( aGamma ); |
---|
| 3894 | break; |
---|
| 3895 | case 2: |
---|
| 3896 | v[1]->SetDefinition( aProton ); |
---|
| 3897 | v[2]->SetDefinition( aGamma ); |
---|
| 3898 | break; |
---|
| 3899 | case 3: |
---|
| 3900 | v[1]->SetDefinition( aDeuteron ); |
---|
| 3901 | v[2]->SetDefinition( aGamma ); |
---|
| 3902 | break; |
---|
| 3903 | case 4: |
---|
| 3904 | v[1]->SetDefinition( aTriton ); |
---|
| 3905 | v[2]->SetDefinition( aGamma ); |
---|
| 3906 | break; |
---|
| 3907 | case 5: |
---|
| 3908 | v[1]->SetDefinition( anAlpha ); |
---|
| 3909 | v[2]->SetDefinition( aGamma ); |
---|
| 3910 | break; |
---|
| 3911 | case 6: |
---|
| 3912 | v[1]->SetDefinition( aNeutron ); |
---|
| 3913 | v[2]->SetDefinition( aNeutron ); |
---|
| 3914 | break; |
---|
| 3915 | case 7: |
---|
| 3916 | v[1]->SetDefinition( aNeutron ); |
---|
| 3917 | v[2]->SetDefinition( aProton ); |
---|
| 3918 | break; |
---|
| 3919 | case 8: |
---|
| 3920 | v[1]->SetDefinition( aProton ); |
---|
| 3921 | v[2]->SetDefinition( aProton ); |
---|
| 3922 | break; |
---|
| 3923 | } |
---|
| 3924 | // |
---|
| 3925 | // calculate centre of mass energy |
---|
| 3926 | // |
---|
| 3927 | G4ReactionProduct pseudo1; |
---|
| 3928 | pseudo1.SetMass( theAtomicMass*MeV ); |
---|
| 3929 | pseudo1.SetTotalEnergy( theAtomicMass*MeV ); |
---|
| 3930 | G4ReactionProduct pseudo2 = currentParticle + pseudo1; |
---|
| 3931 | pseudo2.SetMomentum( pseudo2.GetMomentum() * (-1.0) ); |
---|
| 3932 | // |
---|
| 3933 | // use phase space routine in centre of mass system |
---|
| 3934 | // |
---|
| 3935 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; |
---|
| 3936 | tempV.Initialize( nt ); |
---|
| 3937 | G4int tempLen = 0; |
---|
| 3938 | tempV.SetElement( tempLen++, v[0] ); |
---|
| 3939 | tempV.SetElement( tempLen++, v[1] ); |
---|
| 3940 | if( nt == 3 )tempV.SetElement( tempLen++, v[2] ); |
---|
| 3941 | G4bool constantCrossSection = true; |
---|
| 3942 | GenerateNBodyEvent( pseudo2.GetMass()/MeV, constantCrossSection, tempV, tempLen ); |
---|
| 3943 | v[0]->Lorentz( *v[0], pseudo2 ); |
---|
| 3944 | v[1]->Lorentz( *v[1], pseudo2 ); |
---|
| 3945 | if( nt == 3 )v[2]->Lorentz( *v[2], pseudo2 ); |
---|
| 3946 | |
---|
| 3947 | G4bool particleIsDefined = false; |
---|
| 3948 | if( v[0]->GetMass()/MeV - aProtonMass < 0.1 ) |
---|
| 3949 | { |
---|
| 3950 | v[0]->SetDefinition( aProton ); |
---|
| 3951 | particleIsDefined = true; |
---|
| 3952 | } |
---|
| 3953 | else if( v[0]->GetMass()/MeV - aNeutronMass < 0.1 ) |
---|
| 3954 | { |
---|
| 3955 | v[0]->SetDefinition( aNeutron ); |
---|
| 3956 | particleIsDefined = true; |
---|
| 3957 | } |
---|
| 3958 | else if( v[0]->GetMass()/MeV - aDeuteronMass < 0.1 ) |
---|
| 3959 | { |
---|
| 3960 | v[0]->SetDefinition( aDeuteron ); |
---|
| 3961 | particleIsDefined = true; |
---|
| 3962 | } |
---|
| 3963 | else if( v[0]->GetMass()/MeV - aTritonMass < 0.1 ) |
---|
| 3964 | { |
---|
| 3965 | v[0]->SetDefinition( aTriton ); |
---|
| 3966 | particleIsDefined = true; |
---|
| 3967 | } |
---|
| 3968 | else if( v[0]->GetMass()/MeV - anAlphaMass < 0.1 ) |
---|
| 3969 | { |
---|
| 3970 | v[0]->SetDefinition( anAlpha ); |
---|
| 3971 | particleIsDefined = true; |
---|
| 3972 | } |
---|
| 3973 | currentParticle.SetKineticEnergy( |
---|
| 3974 | std::max( 0.001, currentParticle.GetKineticEnergy()/MeV ) ); |
---|
| 3975 | p = currentParticle.GetTotalMomentum(); |
---|
| 3976 | pp = currentParticle.GetMomentum().mag(); |
---|
| 3977 | if( pp <= 0.001*MeV ) |
---|
| 3978 | { |
---|
| 3979 | G4double phinve = twopi*G4UniformRand(); |
---|
| 3980 | G4double rthnve = std::acos( std::max( -1.0, std::min( 1.0, -1.0 + 2.0*G4UniformRand() ) ) ); |
---|
| 3981 | currentParticle.SetMomentum( p*std::sin(rthnve)*std::cos(phinve), |
---|
| 3982 | p*std::sin(rthnve)*std::sin(phinve), |
---|
| 3983 | p*std::cos(rthnve) ); |
---|
| 3984 | } |
---|
| 3985 | else |
---|
| 3986 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (p/pp) ); |
---|
| 3987 | |
---|
| 3988 | if( particleIsDefined ) |
---|
| 3989 | { |
---|
| 3990 | v[0]->SetKineticEnergy( |
---|
| 3991 | std::max( 0.001, 0.5*G4UniformRand()*v[0]->GetKineticEnergy()/MeV ) ); |
---|
| 3992 | p = v[0]->GetTotalMomentum(); |
---|
| 3993 | pp = v[0]->GetMomentum().mag(); |
---|
| 3994 | if( pp <= 0.001*MeV ) |
---|
| 3995 | { |
---|
| 3996 | G4double phinve = twopi*G4UniformRand(); |
---|
| 3997 | G4double rthnve = std::acos( std::max(-1.0,std::min(1.0,-1.0+2.0*G4UniformRand())) ); |
---|
| 3998 | v[0]->SetMomentum( p*std::sin(rthnve)*std::cos(phinve), |
---|
| 3999 | p*std::sin(rthnve)*std::sin(phinve), |
---|
| 4000 | p*std::cos(rthnve) ); |
---|
| 4001 | } |
---|
| 4002 | else |
---|
| 4003 | v[0]->SetMomentum( v[0]->GetMomentum() * (p/pp) ); |
---|
| 4004 | } |
---|
| 4005 | if( (v[1]->GetDefinition() == aDeuteron) || |
---|
| 4006 | (v[1]->GetDefinition() == aTriton) || |
---|
| 4007 | (v[1]->GetDefinition() == anAlpha) ) |
---|
| 4008 | v[1]->SetKineticEnergy( |
---|
| 4009 | std::max( 0.001, 0.5*G4UniformRand()*v[1]->GetKineticEnergy()/MeV ) ); |
---|
| 4010 | else |
---|
| 4011 | v[1]->SetKineticEnergy( std::max( 0.001, v[1]->GetKineticEnergy()/MeV ) ); |
---|
| 4012 | |
---|
| 4013 | p = v[1]->GetTotalMomentum(); |
---|
| 4014 | pp = v[1]->GetMomentum().mag(); |
---|
| 4015 | if( pp <= 0.001*MeV ) |
---|
| 4016 | { |
---|
| 4017 | G4double phinve = twopi*G4UniformRand(); |
---|
| 4018 | G4double rthnve = std::acos( std::max(-1.0,std::min(1.0,-1.0+2.0*G4UniformRand())) ); |
---|
| 4019 | v[1]->SetMomentum( p*std::sin(rthnve)*std::cos(phinve), |
---|
| 4020 | p*std::sin(rthnve)*std::sin(phinve), |
---|
| 4021 | p*std::cos(rthnve) ); |
---|
| 4022 | } |
---|
| 4023 | else |
---|
| 4024 | v[1]->SetMomentum( v[1]->GetMomentum() * (p/pp) ); |
---|
| 4025 | |
---|
| 4026 | if( nt == 3 ) |
---|
| 4027 | { |
---|
| 4028 | if( (v[2]->GetDefinition() == aDeuteron) || |
---|
| 4029 | (v[2]->GetDefinition() == aTriton) || |
---|
| 4030 | (v[2]->GetDefinition() == anAlpha) ) |
---|
| 4031 | v[2]->SetKineticEnergy( |
---|
| 4032 | std::max( 0.001, 0.5*G4UniformRand()*v[2]->GetKineticEnergy()/MeV ) ); |
---|
| 4033 | else |
---|
| 4034 | v[2]->SetKineticEnergy( std::max( 0.001, v[2]->GetKineticEnergy()/MeV ) ); |
---|
| 4035 | |
---|
| 4036 | p = v[2]->GetTotalMomentum(); |
---|
| 4037 | pp = v[2]->GetMomentum().mag(); |
---|
| 4038 | if( pp <= 0.001*MeV ) |
---|
| 4039 | { |
---|
| 4040 | G4double phinve = twopi*G4UniformRand(); |
---|
| 4041 | G4double rthnve = std::acos( std::max(-1.0,std::min(1.0,-1.0+2.0*G4UniformRand())) ); |
---|
| 4042 | v[2]->SetMomentum( p*std::sin(rthnve)*std::cos(phinve), |
---|
| 4043 | p*std::sin(rthnve)*std::sin(phinve), |
---|
| 4044 | p*std::cos(rthnve) ); |
---|
| 4045 | } |
---|
| 4046 | else |
---|
| 4047 | v[2]->SetMomentum( v[2]->GetMomentum() * (p/pp) ); |
---|
| 4048 | } |
---|
| 4049 | G4int del; |
---|
| 4050 | for(del=0; del<vecLen; del++) delete vec[del]; |
---|
| 4051 | vecLen = 0; |
---|
| 4052 | if( particleIsDefined ) |
---|
| 4053 | { |
---|
| 4054 | vec.SetElement( vecLen++, v[0] ); |
---|
| 4055 | } |
---|
| 4056 | else |
---|
| 4057 | { |
---|
| 4058 | delete v[0]; |
---|
| 4059 | } |
---|
| 4060 | vec.SetElement( vecLen++, v[1] ); |
---|
| 4061 | if( nt == 3 ) |
---|
| 4062 | { |
---|
| 4063 | vec.SetElement( vecLen++, v[2] ); |
---|
| 4064 | } |
---|
| 4065 | else |
---|
| 4066 | { |
---|
| 4067 | delete v[2]; |
---|
| 4068 | } |
---|
| 4069 | delete [] v; |
---|
| 4070 | return; |
---|
| 4071 | } |
---|
| 4072 | |
---|
| 4073 | /* end of file */ |
---|
| 4074 | |
---|