[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 | // $Id: G4RPGFragmentation.cc,v 1.3 2007/12/06 01:13:14 dennis Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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| 28 | // |
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| 29 | |
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| 30 | #include "G4RPGFragmentation.hh" |
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| 31 | #include "G4AntiProton.hh" |
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| 32 | #include "G4AntiNeutron.hh" |
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| 33 | #include "Randomize.hh" |
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| 34 | #include "G4Poisson.hh" |
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| 35 | #include <iostream> |
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| 36 | #include "G4HadReentrentException.hh" |
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| 37 | #include <signal.h> |
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| 38 | |
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| 39 | |
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| 40 | G4RPGFragmentation::G4RPGFragmentation() |
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| 41 | : G4RPGReaction() {} |
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| 42 | |
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| 43 | |
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| 44 | void G4RPGFragmentation:: |
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| 45 | FragmentationIntegral(G4double pt, G4double et, G4double parMass, G4double secMass) |
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| 46 | { |
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| 47 | pt = std::max( 0.001, pt ); |
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| 48 | G4double dx = 1./(19.*pt); |
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| 49 | G4double x; |
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| 50 | G4double term1; |
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| 51 | G4double term2; |
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| 52 | |
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| 53 | for (G4int i = 1; i < 20; i++) { |
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| 54 | x = (G4double(i) - 0.5)*dx; |
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| 55 | term1 = 1. + parMass*parMass*x*x; |
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| 56 | term2 = pt*x*et*pt*x*et + pt*pt + secMass*secMass; |
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| 57 | dndl[i] = dx / std::sqrt( term1*term1*term1*term2 ) |
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| 58 | + dndl[i-1]; |
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| 59 | } |
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| 60 | } |
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| 61 | |
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| 62 | |
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| 63 | G4bool G4RPGFragmentation:: |
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| 64 | ReactionStage(const G4HadProjectile* originalIncident, |
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| 65 | G4ReactionProduct& modifiedOriginal, |
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| 66 | G4bool& incidentHasChanged, |
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| 67 | const G4DynamicParticle* originalTarget, |
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| 68 | G4ReactionProduct& targetParticle, |
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| 69 | G4bool& targetHasChanged, |
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| 70 | const G4Nucleus& targetNucleus, |
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| 71 | G4ReactionProduct& currentParticle, |
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| 72 | G4FastVector<G4ReactionProduct,256>& vec, |
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| 73 | G4int& vecLen, |
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| 74 | G4bool leadFlag, |
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| 75 | G4ReactionProduct& leadingStrangeParticle) |
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| 76 | { |
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| 77 | // |
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| 78 | // Derived from H. Fesefeldt's original FORTRAN code GENXPT |
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| 79 | // |
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| 80 | // Generation of x- and pT- values for incident, target, and all secondary |
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| 81 | // particles using a simple single variable description E D3S/DP3= F(Q) |
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| 82 | // with Q^2 = (M*X)^2 + PT^2. Final state kinematics are produced by an |
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| 83 | // FF-type iterative cascade method |
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| 84 | // |
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| 85 | // Internal units are GeV |
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| 86 | // |
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| 87 | |
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| 88 | // Protection in case no secondary has been created. In that case use |
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| 89 | // two-body scattering |
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| 90 | // |
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| 91 | if(vecLen == 0) return false; |
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| 92 | |
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| 93 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
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| 94 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
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| 95 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
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| 96 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
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| 97 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
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| 98 | |
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| 99 | G4int i, l; |
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| 100 | G4bool veryForward = false; |
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| 101 | |
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| 102 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/GeV; |
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| 103 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
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| 104 | const G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
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| 105 | const G4double pOriginal = modifiedOriginal.GetMomentum().mag()/GeV; |
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| 106 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
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| 107 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
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| 108 | targetMass*targetMass + |
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| 109 | 2.0*targetMass*etOriginal ); // GeV |
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| 110 | G4double currentMass = currentParticle.GetMass()/GeV; |
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| 111 | targetMass = targetParticle.GetMass()/GeV; |
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| 112 | // |
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| 113 | // randomize the order of the secondary particles |
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| 114 | // note that the current and target particles are not affected |
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| 115 | // |
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| 116 | for( i=0; i<vecLen; ++i ) |
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| 117 | { |
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| 118 | G4int itemp = G4int( G4UniformRand()*vecLen ); |
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| 119 | G4ReactionProduct pTemp = *vec[itemp]; |
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| 120 | *vec[itemp] = *vec[i]; |
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| 121 | *vec[i] = pTemp; |
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| 122 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 123 | } |
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| 124 | |
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| 125 | if( currentMass == 0.0 && targetMass == 0.0 ) |
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| 126 | { |
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| 127 | // Target and projectile have annihilated. Replace them with the first |
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| 128 | // two secondaries in the list. Current particle KE is maintained. |
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| 129 | |
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| 130 | G4double ek = currentParticle.GetKineticEnergy(); |
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| 131 | G4ThreeVector m = currentParticle.GetMomentum(); |
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| 132 | currentParticle = *vec[0]; |
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| 133 | targetParticle = *vec[1]; |
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| 134 | for( i=0; i<(vecLen-2); ++i )*vec[i] = *vec[i+2]; |
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| 135 | G4ReactionProduct *temp = vec[vecLen-1]; |
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| 136 | delete temp; |
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| 137 | temp = vec[vecLen-2]; |
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| 138 | delete temp; |
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| 139 | vecLen -= 2; |
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| 140 | currentMass = currentParticle.GetMass()/GeV; |
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| 141 | targetMass = targetParticle.GetMass()/GeV; |
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| 142 | incidentHasChanged = true; |
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| 143 | targetHasChanged = true; |
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| 144 | currentParticle.SetKineticEnergy( ek ); |
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| 145 | currentParticle.SetMomentum( m ); |
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| 146 | veryForward = true; |
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| 147 | } |
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| 148 | const G4double atomicWeight = targetNucleus.GetN(); |
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| 149 | const G4double atomicNumber = targetNucleus.GetZ(); |
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| 150 | const G4double protonMass = aProton->GetPDGMass()/MeV; |
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| 151 | |
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| 152 | if (originalIncident->GetDefinition()->GetParticleSubType() == "kaon" |
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| 153 | && G4UniformRand() >= 0.7) { |
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| 154 | G4ReactionProduct temp = currentParticle; |
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| 155 | currentParticle = targetParticle; |
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| 156 | targetParticle = temp; |
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| 157 | incidentHasChanged = true; |
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| 158 | targetHasChanged = true; |
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| 159 | currentMass = currentParticle.GetMass()/GeV; |
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| 160 | targetMass = targetParticle.GetMass()/GeV; |
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| 161 | } |
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| 162 | const G4double afc = std::min( 0.75, |
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| 163 | 0.312+0.200*std::log(std::log(centerofmassEnergy*centerofmassEnergy))+ |
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| 164 | std::pow(centerofmassEnergy*centerofmassEnergy,1.5)/6000.0 ); |
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| 165 | |
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| 166 | G4double freeEnergy = centerofmassEnergy-currentMass-targetMass; |
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| 167 | G4double forwardEnergy = freeEnergy/2.; |
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| 168 | G4int forwardCount = 1; // number of particles in forward hemisphere |
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| 169 | |
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| 170 | G4double backwardEnergy = freeEnergy/2.; |
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| 171 | G4int backwardCount = 1; // number of particles in backward hemisphere |
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| 172 | |
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| 173 | if(veryForward) |
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| 174 | { |
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| 175 | if(currentParticle.GetSide()==-1) |
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| 176 | { |
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| 177 | forwardEnergy += currentMass; |
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| 178 | forwardCount --; |
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| 179 | backwardEnergy -= currentMass; |
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| 180 | backwardCount ++; |
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| 181 | } |
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| 182 | if(targetParticle.GetSide()!=-1) |
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| 183 | { |
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| 184 | backwardEnergy += targetMass; |
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| 185 | backwardCount --; |
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| 186 | forwardEnergy -= targetMass; |
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| 187 | forwardCount ++; |
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| 188 | } |
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| 189 | } |
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| 190 | |
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| 191 | for( i=0; i<vecLen; ++i ) |
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| 192 | { |
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| 193 | if( vec[i]->GetSide() == -1 ) |
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| 194 | { |
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| 195 | ++backwardCount; |
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| 196 | backwardEnergy -= vec[i]->GetMass()/GeV; |
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| 197 | } else { |
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| 198 | ++forwardCount; |
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| 199 | forwardEnergy -= vec[i]->GetMass()/GeV; |
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| 200 | } |
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| 201 | } |
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| 202 | // |
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| 203 | // Add particles from intranuclear cascade. |
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| 204 | // nuclearExcitationCount = number of new secondaries produced by nuclear excitation |
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| 205 | // extraCount = number of nucleons within these new secondaries |
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| 206 | // |
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| 207 | G4double xtarg; |
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| 208 | if( centerofmassEnergy < (2.0+G4UniformRand()) ) |
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| 209 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2.0*backwardCount+vecLen+2)/2.0; |
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| 210 | else |
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| 211 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2.0*backwardCount); |
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| 212 | if( xtarg <= 0.0 )xtarg = 0.01; |
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| 213 | G4int nuclearExcitationCount = G4Poisson( xtarg ); |
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| 214 | if(atomicWeight<1.0001) nuclearExcitationCount = 0; |
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| 215 | G4int extraNucleonCount = 0; |
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| 216 | G4double extraNucleonMass = 0.0; |
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| 217 | if( nuclearExcitationCount > 0 ) |
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| 218 | { |
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| 219 | const G4double nucsup[] = { 1.00, 0.7, 0.5, 0.4, 0.35, 0.3 }; |
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| 220 | const G4double psup[] = { 3., 6., 20., 50., 100., 1000. }; |
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| 221 | G4int momentumBin = 0; |
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| 222 | while( (momentumBin < 6) && |
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| 223 | (modifiedOriginal.GetTotalMomentum()/GeV > psup[momentumBin]) ) |
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| 224 | ++momentumBin; |
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| 225 | momentumBin = std::min( 5, momentumBin ); |
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| 226 | // |
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| 227 | // NOTE: in GENXPT, these new particles were given negative codes |
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| 228 | // here I use NewlyAdded = true instead |
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| 229 | // |
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| 230 | |
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| 231 | for( i=0; i<nuclearExcitationCount; ++i ) |
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| 232 | { |
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| 233 | G4ReactionProduct * pVec = new G4ReactionProduct(); |
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| 234 | if( G4UniformRand() < nucsup[momentumBin] ) |
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| 235 | { |
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| 236 | if( G4UniformRand() > 1.0-atomicNumber/atomicWeight ) |
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| 237 | pVec->SetDefinition( aProton ); |
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| 238 | else |
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| 239 | pVec->SetDefinition( aNeutron ); |
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| 240 | pVec->SetSide( -2 ); // -2 means backside nucleon |
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| 241 | ++extraNucleonCount; |
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| 242 | backwardEnergy += pVec->GetMass()/GeV; |
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| 243 | extraNucleonMass += pVec->GetMass()/GeV; |
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| 244 | } |
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| 245 | else |
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| 246 | { |
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| 247 | G4double ran = G4UniformRand(); |
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| 248 | if( ran < 0.3181 ) |
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| 249 | pVec->SetDefinition( aPiPlus ); |
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| 250 | else if( ran < 0.6819 ) |
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| 251 | pVec->SetDefinition( aPiZero ); |
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| 252 | else |
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| 253 | pVec->SetDefinition( aPiMinus ); |
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| 254 | pVec->SetSide( -1 ); // backside particle, but not a nucleon |
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| 255 | } |
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| 256 | pVec->SetNewlyAdded( true ); // true is the same as IPA(i)<0 |
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| 257 | vec.SetElement( vecLen++, pVec ); |
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| 258 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 259 | backwardEnergy -= pVec->GetMass()/GeV; |
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| 260 | ++backwardCount; |
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| 261 | } |
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| 262 | } |
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| 263 | // |
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| 264 | // assume conservation of kinetic energy in forward & backward hemispheres |
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| 265 | // |
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| 266 | G4int is, iskip; |
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| 267 | while( forwardEnergy <= 0.0 ) // must eliminate a particle from the forward side |
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| 268 | { |
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| 269 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 270 | iskip = G4int(G4UniformRand()*forwardCount) + 1; // 1 <= iskip <= forwardCount |
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| 271 | is = 0; |
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| 272 | G4int forwardParticlesLeft = 0; |
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| 273 | for( i=(vecLen-1); i>=0; --i ) |
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| 274 | { |
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| 275 | if( vec[i]->GetSide() == 1 && vec[i]->GetMayBeKilled()) |
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| 276 | { |
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| 277 | forwardParticlesLeft = 1; |
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| 278 | if( ++is == iskip ) |
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| 279 | { |
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| 280 | forwardEnergy += vec[i]->GetMass()/GeV; |
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| 281 | for( G4int j=i; j<(vecLen-1); j++ )*vec[j] = *vec[j+1]; // shift up |
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| 282 | --forwardCount; |
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| 283 | delete vec[vecLen-1]; |
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| 284 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
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| 285 | break; // --+ |
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| 286 | } // | |
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| 287 | } // | |
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| 288 | } // break goes down to here |
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| 289 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 290 | if( forwardParticlesLeft == 0 ) |
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| 291 | { |
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| 292 | G4int iremove = -1; |
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| 293 | for (G4int i = 0; i < vecLen; i++) { |
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| 294 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
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| 295 | iremove = i; |
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| 296 | break; |
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| 297 | } |
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| 298 | } |
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| 299 | if (iremove == -1) { |
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| 300 | for (G4int i = 0; i < vecLen; i++) { |
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| 301 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
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| 302 | iremove = i; |
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| 303 | break; |
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| 304 | } |
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| 305 | } |
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| 306 | } |
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| 307 | if (iremove == -1) iremove = 0; |
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| 308 | |
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| 309 | forwardEnergy += vec[iremove]->GetMass()/GeV; |
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| 310 | if (vec[iremove]->GetSide() > 0) --forwardCount; |
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| 311 | |
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| 312 | for (G4int i = iremove; i < vecLen-1; i++) *vec[i] = *vec[i+1]; |
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| 313 | delete vec[vecLen-1]; |
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| 314 | vecLen--; |
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| 315 | if (vecLen == 0) return false; // all secondaries have been eliminated |
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| 316 | break; |
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| 317 | } |
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| 318 | } // while |
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| 319 | |
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| 320 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 321 | while( backwardEnergy <= 0.0 ) // must eliminate a particle from the backward side |
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| 322 | { |
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| 323 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 324 | iskip = G4int(G4UniformRand()*backwardCount) + 1; // 1 <= iskip <= backwardCount |
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| 325 | is = 0; |
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| 326 | G4int backwardParticlesLeft = 0; |
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| 327 | for( i=(vecLen-1); i>=0; --i ) |
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| 328 | { |
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| 329 | if( vec[i]->GetSide() < 0 && vec[i]->GetMayBeKilled()) |
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| 330 | { |
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| 331 | backwardParticlesLeft = 1; |
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| 332 | if( ++is == iskip ) // eliminate the i'th particle |
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| 333 | { |
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| 334 | if( vec[i]->GetSide() == -2 ) |
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| 335 | { |
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| 336 | --extraNucleonCount; |
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| 337 | extraNucleonMass -= vec[i]->GetMass()/GeV; |
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| 338 | backwardEnergy -= vec[i]->GetTotalEnergy()/GeV; |
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| 339 | } |
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| 340 | backwardEnergy += vec[i]->GetTotalEnergy()/GeV; |
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| 341 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
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| 342 | --backwardCount; |
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| 343 | delete vec[vecLen-1]; |
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| 344 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
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| 345 | break; |
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| 346 | } |
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| 347 | } |
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| 348 | } |
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| 349 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 350 | if( backwardParticlesLeft == 0 ) |
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| 351 | { |
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| 352 | G4int iremove = -1; |
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| 353 | for (G4int i = 0; i < vecLen; i++) { |
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| 354 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
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| 355 | iremove = i; |
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| 356 | break; |
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| 357 | } |
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| 358 | } |
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| 359 | if (iremove == -1) { |
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| 360 | for (G4int i = 0; i < vecLen; i++) { |
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| 361 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
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| 362 | iremove = i; |
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| 363 | break; |
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| 364 | } |
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| 365 | } |
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| 366 | } |
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| 367 | if (iremove == -1) iremove = 0; |
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| 368 | |
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| 369 | backwardEnergy += vec[iremove]->GetMass()/GeV; |
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| 370 | if (vec[iremove]->GetSide() > 0) --backwardCount; |
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| 371 | |
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| 372 | for (G4int i = iremove; i < vecLen-1; i++) *vec[i] = *vec[i+1]; |
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| 373 | delete vec[vecLen-1]; |
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| 374 | vecLen--; |
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| 375 | if (vecLen == 0) return false; // all secondaries have been eliminated |
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| 376 | break; |
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| 377 | } |
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| 378 | } // while |
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| 379 | |
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| 380 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 381 | // |
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| 382 | // define initial state vectors for Lorentz transformations |
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| 383 | // the pseudoParticles have non-standard masses, hence the "pseudo" |
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| 384 | // |
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| 385 | G4ReactionProduct pseudoParticle[8]; |
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| 386 | for( i=0; i<8; ++i )pseudoParticle[i].SetZero(); |
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| 387 | |
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| 388 | pseudoParticle[0].SetMass( mOriginal*GeV ); |
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| 389 | pseudoParticle[0].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
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| 390 | pseudoParticle[0].SetTotalEnergy( |
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| 391 | std::sqrt( pOriginal*pOriginal + mOriginal*mOriginal )*GeV ); |
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| 392 | |
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| 393 | pseudoParticle[1].SetMass( protonMass*MeV ); // this could be targetMass |
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| 394 | pseudoParticle[1].SetTotalEnergy( protonMass*MeV ); |
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| 395 | |
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| 396 | pseudoParticle[3].SetMass( protonMass*(1+extraNucleonCount)*MeV ); |
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| 397 | pseudoParticle[3].SetTotalEnergy( protonMass*(1+extraNucleonCount)*MeV ); |
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| 398 | |
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| 399 | pseudoParticle[2] = pseudoParticle[0] + pseudoParticle[1]; |
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| 400 | pseudoParticle[3] = pseudoParticle[3] + pseudoParticle[0]; |
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| 401 | |
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| 402 | pseudoParticle[0].Lorentz( pseudoParticle[0], pseudoParticle[2] ); |
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| 403 | pseudoParticle[1].Lorentz( pseudoParticle[1], pseudoParticle[2] ); |
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| 404 | |
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| 405 | // |
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| 406 | // main loop for 4-momentum generation |
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| 407 | // see Pitha-report (Aachen) for a detailed description of the method |
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| 408 | // |
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| 409 | G4double aspar, pt, et, x, pp, pp1, wgt; |
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| 410 | G4int innerCounter, outerCounter; |
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| 411 | G4bool eliminateThisParticle, resetEnergies, constantCrossSection; |
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| 412 | |
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| 413 | G4double forwardKinetic = 0.0, backwardKinetic = 0.0; |
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| 414 | // |
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| 415 | // process the secondary particles in reverse order |
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| 416 | // the incident particle is Done after the secondaries |
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| 417 | // nucleons, including the target, in the backward hemisphere are also Done later |
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| 418 | // |
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| 419 | G4int backwardNucleonCount = 0; // number of nucleons in backward hemisphere |
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| 420 | G4double totalEnergy, kineticEnergy, vecMass; |
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| 421 | |
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| 422 | for( i=(vecLen-1); i>=0; --i ) |
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| 423 | { |
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| 424 | G4double phi = G4UniformRand()*twopi; |
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| 425 | if( vec[i]->GetNewlyAdded() ) // added from intranuclear cascade |
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| 426 | { |
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| 427 | if( vec[i]->GetSide() == -2 ) // is a nucleon |
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| 428 | { |
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| 429 | if( backwardNucleonCount < 18 ) |
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| 430 | { |
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| 431 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
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| 432 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
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| 433 | vecLen = 0; |
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| 434 | throw G4HadReentrentException(__FILE__, __LINE__, |
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| 435 | "G4RPGFragmentation::ReactionStage : a pion has been counted as a backward nucleon"); |
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| 436 | } |
---|
| 437 | vec[i]->SetSide( -3 ); |
---|
| 438 | ++backwardNucleonCount; |
---|
| 439 | continue; |
---|
| 440 | } |
---|
| 441 | } |
---|
| 442 | } |
---|
| 443 | // |
---|
| 444 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
| 445 | // set mass parameter for lambda fragmentation model |
---|
| 446 | // |
---|
| 447 | vecMass = vec[i]->GetMass()/GeV; |
---|
| 448 | G4double ran = -std::log(1.0-G4UniformRand())/3.5; |
---|
| 449 | if( vec[i]->GetSide() == -2 ) // backward nucleon |
---|
| 450 | { |
---|
| 451 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 452 | vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 453 | aspar = 0.75; |
---|
| 454 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
| 455 | } else { // vec[i] must be a proton, neutron, |
---|
| 456 | aspar = 0.20; // lambda, sigma, xsi, or ion |
---|
| 457 | pt = std::sqrt( std::pow( ran, 1.2 ) ); |
---|
| 458 | } |
---|
| 459 | |
---|
| 460 | } else { // not a backward nucleon |
---|
| 461 | |
---|
| 462 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 463 | aspar = 0.75; |
---|
| 464 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
| 465 | } else if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
---|
| 466 | aspar = 0.70; |
---|
| 467 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
| 468 | } else { // vec[i] must be a proton, neutron, |
---|
| 469 | aspar = 0.65; // lambda, sigma, xsi, or ion |
---|
| 470 | pt = std::sqrt( std::pow( ran, 1.5 ) ); |
---|
| 471 | } |
---|
| 472 | } |
---|
| 473 | pt = std::max( 0.001, pt ); |
---|
| 474 | vec[i]->SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
| 475 | if( vec[i]->GetSide() > 0 ) |
---|
| 476 | et = pseudoParticle[0].GetTotalEnergy()/GeV; |
---|
| 477 | else |
---|
| 478 | et = pseudoParticle[1].GetTotalEnergy()/GeV; |
---|
| 479 | |
---|
| 480 | // |
---|
| 481 | // start of outer iteration loop |
---|
| 482 | // |
---|
| 483 | outerCounter = 0; |
---|
| 484 | eliminateThisParticle = true; |
---|
| 485 | resetEnergies = true; |
---|
| 486 | dndl[0] = 0.0; |
---|
| 487 | |
---|
| 488 | while( ++outerCounter < 3 ) |
---|
| 489 | { |
---|
| 490 | FragmentationIntegral(pt, et, aspar, vecMass); |
---|
| 491 | |
---|
| 492 | innerCounter = 0; |
---|
| 493 | vec[i]->SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
| 494 | // |
---|
| 495 | // start of inner iteration loop |
---|
| 496 | // |
---|
| 497 | while( ++innerCounter < 7 ) |
---|
| 498 | { |
---|
| 499 | ran = G4UniformRand()*dndl[19]; |
---|
| 500 | l = 1; |
---|
| 501 | while( ( ran > dndl[l] ) && ( l < 19 ) ) l++; |
---|
| 502 | x = (G4double(l-1) + G4UniformRand())/19.; |
---|
| 503 | if( vec[i]->GetSide() < 0 )x *= -1.; |
---|
| 504 | vec[i]->SetMomentum( x*et*GeV ); // set the z-momentum |
---|
| 505 | totalEnergy = std::sqrt( x*et*x*et + pt*pt + vecMass*vecMass ); |
---|
| 506 | vec[i]->SetTotalEnergy( totalEnergy*GeV ); |
---|
| 507 | kineticEnergy = vec[i]->GetKineticEnergy()/GeV; |
---|
| 508 | if( vec[i]->GetSide() > 0 ) // forward side |
---|
| 509 | { |
---|
| 510 | if( (forwardKinetic+kineticEnergy) < 0.95*forwardEnergy ) |
---|
| 511 | { |
---|
| 512 | pseudoParticle[4] = pseudoParticle[4] + (*vec[i]); |
---|
| 513 | forwardKinetic += kineticEnergy; |
---|
| 514 | outerCounter = 2; // leave outer loop |
---|
| 515 | eliminateThisParticle = false; // don't eliminate this particle |
---|
| 516 | resetEnergies = false; |
---|
| 517 | break; // leave inner loop |
---|
| 518 | } |
---|
| 519 | if( innerCounter > 5 )break; // leave inner loop |
---|
| 520 | if( backwardEnergy >= vecMass ) // switch sides |
---|
| 521 | { |
---|
| 522 | vec[i]->SetSide( -1 ); |
---|
| 523 | forwardEnergy += vecMass; |
---|
| 524 | backwardEnergy -= vecMass; |
---|
| 525 | ++backwardCount; |
---|
| 526 | } |
---|
| 527 | } else { // backward side |
---|
| 528 | if( extraNucleonCount > 19 ) // commented out to duplicate ?bug? in GENXPT |
---|
| 529 | x = 0.999; |
---|
| 530 | G4double xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
| 531 | if( (backwardKinetic+kineticEnergy) < xxx*backwardEnergy ) |
---|
| 532 | { |
---|
| 533 | pseudoParticle[5] = pseudoParticle[5] + (*vec[i]); |
---|
| 534 | backwardKinetic += kineticEnergy; |
---|
| 535 | outerCounter = 2; // leave outer loop |
---|
| 536 | eliminateThisParticle = false; // don't eliminate this particle |
---|
| 537 | resetEnergies = false; |
---|
| 538 | break; // leave inner loop |
---|
| 539 | } |
---|
| 540 | if( innerCounter > 5 )break; // leave inner loop |
---|
| 541 | if( forwardEnergy >= vecMass ) // switch sides |
---|
| 542 | { |
---|
| 543 | vec[i]->SetSide( 1 ); |
---|
| 544 | forwardEnergy -= vecMass; |
---|
| 545 | backwardEnergy += vecMass; |
---|
| 546 | backwardCount--; |
---|
| 547 | } |
---|
| 548 | } |
---|
| 549 | G4ThreeVector momentum = vec[i]->GetMomentum(); |
---|
| 550 | vec[i]->SetMomentum( momentum.x() * 0.9, momentum.y() * 0.9 ); |
---|
| 551 | pt *= 0.9; |
---|
| 552 | dndl[19] *= 0.9; |
---|
| 553 | } // closes inner loop |
---|
| 554 | if( resetEnergies ) { |
---|
| 555 | // If we get to here, the inner loop has been done 6 times. |
---|
| 556 | // Reset the kinetic energies of previously done particles, if |
---|
| 557 | // they are lighter than protons and in the forward hemisphere, |
---|
| 558 | // then continue with outer loop. |
---|
| 559 | // |
---|
| 560 | forwardKinetic = 0.0; |
---|
| 561 | backwardKinetic = 0.0; |
---|
| 562 | pseudoParticle[4].SetZero(); |
---|
| 563 | pseudoParticle[5].SetZero(); |
---|
| 564 | for( l=i+1; l<vecLen; ++l ) { |
---|
| 565 | if (vec[l]->GetSide() > 0 || |
---|
| 566 | vec[l]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 567 | vec[l]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 568 | |
---|
| 569 | G4double tempMass = vec[l]->GetMass()/MeV; |
---|
| 570 | totalEnergy = 0.95*vec[l]->GetTotalEnergy()/MeV + 0.05*tempMass; |
---|
| 571 | totalEnergy = std::max( tempMass, totalEnergy ); |
---|
| 572 | vec[l]->SetTotalEnergy( totalEnergy*MeV ); |
---|
| 573 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - tempMass*tempMass ) ); |
---|
| 574 | pp1 = vec[l]->GetMomentum().mag()/MeV; |
---|
| 575 | if( pp1 < 1.0e-6*GeV ) { |
---|
| 576 | G4ThreeVector iso = Isotropic(pp); |
---|
| 577 | vec[l]->SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 578 | } else { |
---|
| 579 | vec[l]->SetMomentum( vec[l]->GetMomentum() * (pp/pp1) ); |
---|
| 580 | } |
---|
| 581 | G4double px = vec[l]->GetMomentum().x()/MeV; |
---|
| 582 | G4double py = vec[l]->GetMomentum().y()/MeV; |
---|
| 583 | pt = std::max( 1.0, std::sqrt( px*px + py*py ) )/GeV; |
---|
| 584 | if( vec[l]->GetSide() > 0 ) |
---|
| 585 | { |
---|
| 586 | forwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
| 587 | pseudoParticle[4] = pseudoParticle[4] + (*vec[l]); |
---|
| 588 | } else { |
---|
| 589 | backwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
| 590 | pseudoParticle[5] = pseudoParticle[5] + (*vec[l]); |
---|
| 591 | } |
---|
| 592 | } // if pi, K or forward |
---|
| 593 | } // for l |
---|
| 594 | } // if resetEnergies |
---|
| 595 | } // closes outer loop |
---|
| 596 | |
---|
| 597 | if( eliminateThisParticle && vec[i]->GetMayBeKilled()) // not enough energy, eliminate this particle |
---|
| 598 | { |
---|
| 599 | if( vec[i]->GetSide() > 0 ) |
---|
| 600 | { |
---|
| 601 | --forwardCount; |
---|
| 602 | forwardEnergy += vecMass; |
---|
| 603 | } else { |
---|
| 604 | if( vec[i]->GetSide() == -2 ) |
---|
| 605 | { |
---|
| 606 | --extraNucleonCount; |
---|
| 607 | extraNucleonMass -= vecMass; |
---|
| 608 | backwardEnergy -= vecMass; |
---|
| 609 | } |
---|
| 610 | --backwardCount; |
---|
| 611 | backwardEnergy += vecMass; |
---|
| 612 | } |
---|
| 613 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
| 614 | G4ReactionProduct *temp = vec[vecLen-1]; |
---|
| 615 | delete temp; |
---|
| 616 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 617 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
---|
| 618 | } |
---|
| 619 | } // closes main for loop |
---|
| 620 | |
---|
| 621 | // |
---|
| 622 | // for the incident particle: it was placed in the forward hemisphere |
---|
| 623 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
| 624 | // set mass parameter for lambda fragmentation model |
---|
| 625 | // |
---|
| 626 | G4double phi = G4UniformRand()*twopi; |
---|
| 627 | G4double ran = -std::log(1.0-G4UniformRand()); |
---|
| 628 | if (currentParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 629 | aspar = 0.60; |
---|
| 630 | pt = std::sqrt( std::pow( ran/6.0, 1.7 ) ); |
---|
| 631 | } else if (currentParticle.GetDefinition()->GetParticleSubType() == "kaon") { |
---|
| 632 | aspar = 0.50; |
---|
| 633 | pt = std::sqrt( std::pow( ran/5.0, 1.4 ) ); |
---|
| 634 | } else { |
---|
| 635 | aspar = 0.40; |
---|
| 636 | pt = std::sqrt( std::pow( ran/4.0, 1.2 ) ); |
---|
| 637 | } |
---|
| 638 | |
---|
| 639 | currentParticle.SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
| 640 | et = pseudoParticle[0].GetTotalEnergy()/GeV; |
---|
| 641 | dndl[0] = 0.0; |
---|
| 642 | vecMass = currentParticle.GetMass()/GeV; |
---|
| 643 | |
---|
| 644 | FragmentationIntegral(pt, et, aspar, vecMass); |
---|
| 645 | |
---|
| 646 | ran = G4UniformRand()*dndl[19]; |
---|
| 647 | l = 1; |
---|
| 648 | while( ( ran > dndl[l] ) && ( l < 19 ) ) l++; |
---|
| 649 | x = (G4double(l-1) + G4UniformRand())/19.; |
---|
| 650 | currentParticle.SetMomentum( x*et*GeV ); // set the z-momentum |
---|
| 651 | if( forwardEnergy < forwardKinetic ) |
---|
| 652 | totalEnergy = vecMass + 0.04*std::fabs(normal()); |
---|
| 653 | else |
---|
| 654 | totalEnergy = vecMass + forwardEnergy - forwardKinetic; |
---|
| 655 | currentParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
| 656 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
| 657 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 658 | |
---|
| 659 | if( pp1 < 1.0e-6*GeV ) { |
---|
| 660 | G4ThreeVector iso = Isotropic(pp); |
---|
| 661 | currentParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 662 | } else { |
---|
| 663 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 664 | } |
---|
| 665 | pseudoParticle[4] = pseudoParticle[4] + currentParticle; |
---|
| 666 | |
---|
| 667 | // |
---|
| 668 | // Current particle now finished |
---|
| 669 | // |
---|
| 670 | // Begin target particle |
---|
| 671 | // |
---|
| 672 | |
---|
| 673 | if( backwardNucleonCount < 18 ) |
---|
| 674 | { |
---|
| 675 | targetParticle.SetSide( -3 ); |
---|
| 676 | ++backwardNucleonCount; |
---|
| 677 | } |
---|
| 678 | else |
---|
| 679 | { |
---|
| 680 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
| 681 | // set mass parameter for lambda fragmentation model |
---|
| 682 | // |
---|
| 683 | vecMass = targetParticle.GetMass()/GeV; |
---|
| 684 | ran = -std::log(1.0-G4UniformRand()); |
---|
| 685 | aspar = 0.40; |
---|
| 686 | pt = std::max( 0.001, std::sqrt( std::pow( ran/4.0, 1.2 ) ) ); |
---|
| 687 | targetParticle.SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
| 688 | et = pseudoParticle[1].GetTotalEnergy()/GeV; |
---|
| 689 | outerCounter = 0; |
---|
| 690 | eliminateThisParticle = true; // should never eliminate the target particle |
---|
| 691 | resetEnergies = true; |
---|
| 692 | dndl[0] = 0.0; |
---|
| 693 | |
---|
| 694 | while( ++outerCounter < 3 ) // start of outer iteration loop |
---|
| 695 | { |
---|
| 696 | FragmentationIntegral(pt, et, aspar, vecMass); |
---|
| 697 | |
---|
| 698 | innerCounter = 0; |
---|
| 699 | while( ++innerCounter < 7 ) // start of inner iteration loop |
---|
| 700 | { |
---|
| 701 | ran = G4UniformRand()*dndl[19]; |
---|
| 702 | l = 1; |
---|
| 703 | while( ( ran > dndl[l] ) && ( l < 19 ) ) l++; |
---|
| 704 | x = (G4double(l-1) + G4UniformRand())/19.; |
---|
| 705 | if( targetParticle.GetSide() < 0 )x *= -1.; |
---|
| 706 | targetParticle.SetMomentum( x*et*GeV ); // set the z-momentum |
---|
| 707 | totalEnergy = std::sqrt( x*et*x*et + pt*pt + vecMass*vecMass ); |
---|
| 708 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
| 709 | if( targetParticle.GetSide() < 0 ) |
---|
| 710 | { |
---|
| 711 | if( extraNucleonCount > 19 )x=0.999; |
---|
| 712 | G4double xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
| 713 | if( (backwardKinetic+totalEnergy-vecMass) < xxx*backwardEnergy ) |
---|
| 714 | { |
---|
| 715 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
| 716 | backwardKinetic += totalEnergy - vecMass; |
---|
| 717 | // pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
| 718 | // pseudoParticle[6].SetMomentum( 0.0 ); // set z-momentum |
---|
| 719 | outerCounter = 2; // leave outer loop |
---|
| 720 | eliminateThisParticle = false; // don't eliminate this particle |
---|
| 721 | resetEnergies = false; |
---|
| 722 | break; // leave inner loop |
---|
| 723 | } |
---|
| 724 | if( innerCounter > 5 )break; // leave inner loop |
---|
| 725 | if( forwardEnergy >= vecMass ) // switch sides |
---|
| 726 | { |
---|
| 727 | targetParticle.SetSide( 1 ); |
---|
| 728 | forwardEnergy -= vecMass; |
---|
| 729 | backwardEnergy += vecMass; |
---|
| 730 | --backwardCount; |
---|
| 731 | } |
---|
| 732 | G4ThreeVector momentum = targetParticle.GetMomentum(); |
---|
| 733 | targetParticle.SetMomentum( momentum.x() * 0.9, momentum.y() * 0.9 ); |
---|
| 734 | pt *= 0.9; |
---|
| 735 | dndl[19] *= 0.9; |
---|
| 736 | } |
---|
| 737 | else // target has gone to forward side |
---|
| 738 | { |
---|
| 739 | if( forwardEnergy < forwardKinetic ) |
---|
| 740 | totalEnergy = vecMass + 0.04*std::fabs(normal()); |
---|
| 741 | else |
---|
| 742 | totalEnergy = vecMass + forwardEnergy - forwardKinetic; |
---|
| 743 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
| 744 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
| 745 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
| 746 | if( pp1 < 1.0e-6*GeV ) { |
---|
| 747 | G4ThreeVector iso = Isotropic(pp); |
---|
| 748 | targetParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 749 | } else { |
---|
| 750 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 751 | } |
---|
| 752 | |
---|
| 753 | pseudoParticle[4] = pseudoParticle[4] + targetParticle; |
---|
| 754 | outerCounter = 2; // leave outer loop |
---|
| 755 | eliminateThisParticle = false; // don't eliminate this particle |
---|
| 756 | resetEnergies = false; |
---|
| 757 | break; // leave inner loop |
---|
| 758 | } |
---|
| 759 | } // closes inner loop |
---|
| 760 | |
---|
| 761 | if( resetEnergies ) { |
---|
| 762 | // If we get to here, the inner loop has been done 6 times. |
---|
| 763 | // Reset the kinetic energies of previously done particles, |
---|
| 764 | // if they are lighter than protons and in the forward hemisphere, |
---|
| 765 | // then continue with outer loop. |
---|
| 766 | |
---|
| 767 | forwardKinetic = backwardKinetic = 0.0; |
---|
| 768 | pseudoParticle[4].SetZero(); |
---|
| 769 | pseudoParticle[5].SetZero(); |
---|
| 770 | for( l=0; l<vecLen; ++l ) { |
---|
| 771 | if (vec[l]->GetSide() > 0 || |
---|
| 772 | vec[l]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 773 | vec[l]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 774 | G4double tempMass = vec[l]->GetMass()/GeV; |
---|
| 775 | totalEnergy = |
---|
| 776 | std::max( tempMass, 0.95*vec[l]->GetTotalEnergy()/GeV + 0.05*tempMass ); |
---|
| 777 | vec[l]->SetTotalEnergy( totalEnergy*GeV ); |
---|
| 778 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - tempMass*tempMass ) )*GeV; |
---|
| 779 | pp1 = vec[l]->GetMomentum().mag()/MeV; |
---|
| 780 | if( pp1 < 1.0e-6*GeV ) { |
---|
| 781 | G4ThreeVector iso = Isotropic(pp); |
---|
| 782 | vec[l]->SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 783 | } else { |
---|
| 784 | vec[l]->SetMomentum( vec[l]->GetMomentum() * (pp/pp1) ); |
---|
| 785 | } |
---|
| 786 | pt = std::max( 0.001*GeV, std::sqrt( sqr(vec[l]->GetMomentum().x()/MeV) + |
---|
| 787 | sqr(vec[l]->GetMomentum().y()/MeV) ) )/GeV; |
---|
| 788 | if( vec[l]->GetSide() > 0) |
---|
| 789 | { |
---|
| 790 | forwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
| 791 | pseudoParticle[4] = pseudoParticle[4] + (*vec[l]); |
---|
| 792 | } else { |
---|
| 793 | backwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
| 794 | pseudoParticle[5] = pseudoParticle[5] + (*vec[l]); |
---|
| 795 | } |
---|
| 796 | } // if pi, K or forward |
---|
| 797 | } // for l |
---|
| 798 | } // if (resetEnergies) |
---|
| 799 | } // closes outer loop |
---|
| 800 | |
---|
| 801 | // if( eliminateThisParticle ) // not enough energy, eliminate target |
---|
| 802 | // { |
---|
| 803 | // G4cerr << "Warning: eliminating target particle" << G4endl; |
---|
| 804 | // exit( EXIT_FAILURE ); |
---|
| 805 | // } |
---|
| 806 | } |
---|
| 807 | // |
---|
| 808 | // Target particle finished. |
---|
| 809 | // |
---|
| 810 | // Now produce backward nucleons with a cluster model |
---|
| 811 | // |
---|
| 812 | pseudoParticle[6].Lorentz( pseudoParticle[3], pseudoParticle[2] ); |
---|
| 813 | pseudoParticle[6] = pseudoParticle[6] - pseudoParticle[4]; |
---|
| 814 | pseudoParticle[6] = pseudoParticle[6] - pseudoParticle[5]; |
---|
| 815 | if( backwardNucleonCount == 1 ) // target particle is the only backward nucleon |
---|
| 816 | { |
---|
| 817 | G4double ekin = |
---|
| 818 | std::min( backwardEnergy-backwardKinetic, centerofmassEnergy/2.0-protonMass/GeV ); |
---|
| 819 | |
---|
| 820 | if( ekin < 0.04 )ekin = 0.04 * std::fabs( normal() ); |
---|
| 821 | vecMass = targetParticle.GetMass()/GeV; |
---|
| 822 | totalEnergy = ekin+vecMass; |
---|
| 823 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
| 824 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
| 825 | pp1 = pseudoParticle[6].GetMomentum().mag()/MeV; |
---|
| 826 | if( pp1 < 1.0e-6*GeV ) { |
---|
| 827 | G4ThreeVector iso = Isotropic(pp); |
---|
| 828 | targetParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 829 | } else { |
---|
| 830 | targetParticle.SetMomentum( pseudoParticle[6].GetMomentum() * (pp/pp1) ); |
---|
| 831 | } |
---|
| 832 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
| 833 | } |
---|
| 834 | else if (backwardNucleonCount > 1) |
---|
| 835 | { |
---|
| 836 | const G4double cpar[] = { 1.60, 1.35, 1.15, 1.10 }; |
---|
| 837 | const G4double gpar[] = { 2.60, 1.80, 1.30, 1.20 }; |
---|
| 838 | |
---|
| 839 | G4int tempCount = 5; |
---|
| 840 | if (backwardNucleonCount < 5) tempCount = backwardNucleonCount; |
---|
| 841 | tempCount -= 2; |
---|
| 842 | |
---|
| 843 | G4double rmb = 0.; |
---|
| 844 | if( targetParticle.GetSide() == -3 ) rmb += targetParticle.GetMass()/GeV; |
---|
| 845 | for( i=0; i<vecLen; ++i ) |
---|
| 846 | { |
---|
| 847 | if( vec[i]->GetSide() == -3 ) rmb += vec[i]->GetMass()/GeV; |
---|
| 848 | } |
---|
| 849 | rmb += std::pow(-std::log(1.0-G4UniformRand()),1./cpar[tempCount]) / gpar[tempCount]; |
---|
| 850 | totalEnergy = pseudoParticle[6].GetTotalEnergy()/GeV; |
---|
| 851 | vecMass = std::min( rmb, totalEnergy ); |
---|
| 852 | pseudoParticle[6].SetMass( vecMass*GeV ); |
---|
| 853 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
| 854 | pp1 = pseudoParticle[6].GetMomentum().mag()/MeV; |
---|
| 855 | if( pp1 < 1.0e-6*GeV ) { |
---|
| 856 | G4ThreeVector iso = Isotropic(pp); |
---|
| 857 | pseudoParticle[6].SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 858 | } else { |
---|
| 859 | pseudoParticle[6].SetMomentum( pseudoParticle[6].GetMomentum() * (-pp/pp1) ); |
---|
| 860 | } |
---|
| 861 | G4FastVector<G4ReactionProduct,256> tempV; // tempV contains the backward nucleons |
---|
| 862 | tempV.Initialize( backwardNucleonCount ); |
---|
| 863 | G4int tempLen = 0; |
---|
| 864 | if( targetParticle.GetSide() == -3 )tempV.SetElement( tempLen++, &targetParticle ); |
---|
| 865 | for( i=0; i<vecLen; ++i ) |
---|
| 866 | { |
---|
| 867 | if( vec[i]->GetSide() == -3 )tempV.SetElement( tempLen++, vec[i] ); |
---|
| 868 | } |
---|
| 869 | if( tempLen != backwardNucleonCount ) |
---|
| 870 | { |
---|
| 871 | G4cerr << "tempLen is not the same as backwardNucleonCount" << G4endl; |
---|
| 872 | G4cerr << "tempLen = " << tempLen; |
---|
| 873 | G4cerr << ", backwardNucleonCount = " << backwardNucleonCount << G4endl; |
---|
| 874 | G4cerr << "targetParticle side = " << targetParticle.GetSide() << G4endl; |
---|
| 875 | G4cerr << "currentParticle side = " << currentParticle.GetSide() << G4endl; |
---|
| 876 | for( i=0; i<vecLen; ++i ) |
---|
| 877 | G4cerr << "particle #" << i << " side = " << vec[i]->GetSide() << G4endl; |
---|
| 878 | exit( EXIT_FAILURE ); |
---|
| 879 | } |
---|
| 880 | constantCrossSection = true; |
---|
| 881 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 882 | if( tempLen >= 2 ) |
---|
| 883 | { |
---|
| 884 | wgt = GenerateNBodyEvent( |
---|
| 885 | pseudoParticle[6].GetMass(), constantCrossSection, tempV, tempLen ); |
---|
| 886 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 887 | if( targetParticle.GetSide() == -3 ) |
---|
| 888 | { |
---|
| 889 | targetParticle.Lorentz( targetParticle, pseudoParticle[6] ); |
---|
| 890 | // tempV contains the real stuff |
---|
| 891 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
| 892 | } |
---|
| 893 | for( i=0; i<vecLen; ++i ) |
---|
| 894 | { |
---|
| 895 | if( vec[i]->GetSide() == -3 ) |
---|
| 896 | { |
---|
| 897 | vec[i]->Lorentz( *vec[i], pseudoParticle[6] ); |
---|
| 898 | pseudoParticle[5] = pseudoParticle[5] + (*vec[i]); |
---|
| 899 | } |
---|
| 900 | } |
---|
| 901 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 902 | } |
---|
| 903 | } |
---|
| 904 | else return false; |
---|
| 905 | |
---|
| 906 | // |
---|
| 907 | // Lorentz transformation in lab system |
---|
| 908 | // |
---|
| 909 | if( vecLen == 0 )return false; // all the secondaries have been eliminated |
---|
| 910 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 911 | |
---|
| 912 | currentParticle.Lorentz( currentParticle, pseudoParticle[1] ); |
---|
| 913 | targetParticle.Lorentz( targetParticle, pseudoParticle[1] ); |
---|
| 914 | for( i=0; i<vecLen; ++i ) vec[i]->Lorentz( *vec[i], pseudoParticle[1] ); |
---|
| 915 | |
---|
| 916 | // leadFlag will be true if original particle and incident particle are |
---|
| 917 | // both strange, in which case the incident particle becomes the leading |
---|
| 918 | // particle. |
---|
| 919 | // leadFlag will also be true if the target particle is strange, but the |
---|
| 920 | // incident particle is not, in which case the target particle becomes the |
---|
| 921 | // leading particle. |
---|
| 922 | |
---|
| 923 | G4bool leadingStrangeParticleHasChanged = true; |
---|
| 924 | if( leadFlag ) |
---|
| 925 | { |
---|
| 926 | if( currentParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
| 927 | leadingStrangeParticleHasChanged = false; |
---|
| 928 | if( leadingStrangeParticleHasChanged && |
---|
| 929 | ( targetParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) ) |
---|
| 930 | leadingStrangeParticleHasChanged = false; |
---|
| 931 | if( leadingStrangeParticleHasChanged ) |
---|
| 932 | { |
---|
| 933 | for( i=0; i<vecLen; i++ ) |
---|
| 934 | { |
---|
| 935 | if( vec[i]->GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
| 936 | { |
---|
| 937 | leadingStrangeParticleHasChanged = false; |
---|
| 938 | break; |
---|
| 939 | } |
---|
| 940 | } |
---|
| 941 | } |
---|
| 942 | if( leadingStrangeParticleHasChanged ) |
---|
| 943 | { |
---|
| 944 | G4bool leadTest = |
---|
| 945 | (leadingStrangeParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 946 | leadingStrangeParticle.GetDefinition()->GetParticleSubType() == "pi"); |
---|
| 947 | G4bool targetTest = |
---|
| 948 | (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 949 | targetParticle.GetDefinition()->GetParticleSubType() == "pi"); |
---|
| 950 | |
---|
| 951 | // following modified by JLC 22-Oct-97 |
---|
| 952 | |
---|
| 953 | if( (leadTest&&targetTest) || !(leadTest||targetTest) ) // both true or both false |
---|
| 954 | { |
---|
| 955 | targetParticle.SetDefinitionAndUpdateE( leadingStrangeParticle.GetDefinition() ); |
---|
| 956 | targetHasChanged = true; |
---|
| 957 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 958 | } |
---|
| 959 | else |
---|
| 960 | { |
---|
| 961 | currentParticle.SetDefinitionAndUpdateE( leadingStrangeParticle.GetDefinition() ); |
---|
| 962 | incidentHasChanged = false; |
---|
| 963 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 964 | } |
---|
| 965 | } |
---|
| 966 | } // end of if( leadFlag ) |
---|
| 967 | |
---|
| 968 | // Get number of final state nucleons and nucleons remaining in |
---|
| 969 | // target nucleus |
---|
| 970 | |
---|
| 971 | std::pair<G4int, G4int> finalStateNucleons = |
---|
| 972 | GetFinalStateNucleons(originalTarget, vec, vecLen); |
---|
| 973 | |
---|
| 974 | G4int protonsInFinalState = finalStateNucleons.first; |
---|
| 975 | G4int neutronsInFinalState = finalStateNucleons.second; |
---|
| 976 | |
---|
| 977 | G4int numberofFinalStateNucleons = |
---|
| 978 | protonsInFinalState + neutronsInFinalState; |
---|
| 979 | |
---|
| 980 | if (currentParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
| 981 | targetParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
| 982 | originalIncident->GetDefinition()->GetPDGMass() < |
---|
| 983 | G4Lambda::Lambda()->GetPDGMass()) |
---|
| 984 | numberofFinalStateNucleons++; |
---|
| 985 | |
---|
| 986 | numberofFinalStateNucleons = std::max(1, numberofFinalStateNucleons); |
---|
| 987 | |
---|
| 988 | G4int PinNucleus = std::max(0, |
---|
| 989 | G4int(targetNucleus.GetZ()) - protonsInFinalState); |
---|
| 990 | G4int NinNucleus = std::max(0, |
---|
| 991 | G4int(targetNucleus.GetN()-targetNucleus.GetZ()) - neutronsInFinalState); |
---|
| 992 | |
---|
| 993 | pseudoParticle[3].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
| 994 | pseudoParticle[3].SetMass( mOriginal*GeV ); |
---|
| 995 | pseudoParticle[3].SetTotalEnergy( |
---|
| 996 | std::sqrt( pOriginal*pOriginal + mOriginal*mOriginal )*GeV ); |
---|
| 997 | |
---|
| 998 | G4ParticleDefinition * aOrgDef = modifiedOriginal.GetDefinition(); |
---|
| 999 | G4int diff = 0; |
---|
| 1000 | if(aOrgDef == G4Proton::Proton() || aOrgDef == G4Neutron::Neutron() ) diff = 1; |
---|
| 1001 | if(numberofFinalStateNucleons == 1) diff = 0; |
---|
| 1002 | pseudoParticle[4].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 1003 | pseudoParticle[4].SetMass( protonMass*(numberofFinalStateNucleons-diff)*MeV ); |
---|
| 1004 | pseudoParticle[4].SetTotalEnergy( protonMass*(numberofFinalStateNucleons-diff)*MeV ); |
---|
| 1005 | |
---|
| 1006 | G4double theoreticalKinetic = |
---|
| 1007 | pseudoParticle[3].GetTotalEnergy()/MeV + |
---|
| 1008 | pseudoParticle[4].GetTotalEnergy()/MeV - |
---|
| 1009 | currentParticle.GetMass()/MeV - |
---|
| 1010 | targetParticle.GetMass()/MeV; |
---|
| 1011 | |
---|
| 1012 | G4double simulatedKinetic = |
---|
| 1013 | currentParticle.GetKineticEnergy()/MeV + targetParticle.GetKineticEnergy()/MeV; |
---|
| 1014 | |
---|
| 1015 | pseudoParticle[5] = pseudoParticle[3] + pseudoParticle[4]; |
---|
| 1016 | pseudoParticle[3].Lorentz( pseudoParticle[3], pseudoParticle[5] ); |
---|
| 1017 | pseudoParticle[4].Lorentz( pseudoParticle[4], pseudoParticle[5] ); |
---|
| 1018 | |
---|
| 1019 | pseudoParticle[7].SetZero(); |
---|
| 1020 | pseudoParticle[7] = pseudoParticle[7] + currentParticle; |
---|
| 1021 | pseudoParticle[7] = pseudoParticle[7] + targetParticle; |
---|
| 1022 | |
---|
| 1023 | for( i=0; i<vecLen; ++i ) |
---|
| 1024 | { |
---|
| 1025 | pseudoParticle[7] = pseudoParticle[7] + *vec[i]; |
---|
| 1026 | simulatedKinetic += vec[i]->GetKineticEnergy()/MeV; |
---|
| 1027 | theoreticalKinetic -= vec[i]->GetMass()/MeV; |
---|
| 1028 | } |
---|
| 1029 | |
---|
| 1030 | if( vecLen <= 16 && vecLen > 0 ) |
---|
| 1031 | { |
---|
| 1032 | // must create a new set of ReactionProducts here because GenerateNBody will |
---|
| 1033 | // modify the momenta for the particles, and we don't want to do this |
---|
| 1034 | // |
---|
| 1035 | G4ReactionProduct tempR[130]; |
---|
| 1036 | tempR[0] = currentParticle; |
---|
| 1037 | tempR[1] = targetParticle; |
---|
| 1038 | for( i=0; i<vecLen; ++i )tempR[i+2] = *vec[i]; |
---|
| 1039 | G4FastVector<G4ReactionProduct,256> tempV; |
---|
| 1040 | tempV.Initialize( vecLen+2 ); |
---|
| 1041 | G4int tempLen = 0; |
---|
| 1042 | for( i=0; i<vecLen+2; ++i )tempV.SetElement( tempLen++, &tempR[i] ); |
---|
| 1043 | constantCrossSection = true; |
---|
| 1044 | |
---|
| 1045 | wgt = GenerateNBodyEvent( pseudoParticle[3].GetTotalEnergy()/MeV+ |
---|
| 1046 | pseudoParticle[4].GetTotalEnergy()/MeV, |
---|
| 1047 | constantCrossSection, tempV, tempLen ); |
---|
| 1048 | if (wgt == -1) { |
---|
| 1049 | G4double Qvalue = 0; |
---|
| 1050 | for (i = 0; i < tempLen; i++) Qvalue += tempV[i]->GetMass(); |
---|
| 1051 | wgt = GenerateNBodyEvent( Qvalue/MeV, |
---|
| 1052 | constantCrossSection, tempV, tempLen ); |
---|
| 1053 | } |
---|
| 1054 | if(wgt>-.5) |
---|
| 1055 | { |
---|
| 1056 | theoreticalKinetic = 0.0; |
---|
| 1057 | for( i=0; i<tempLen; ++i ) |
---|
| 1058 | { |
---|
| 1059 | pseudoParticle[6].Lorentz( *tempV[i], pseudoParticle[4] ); |
---|
| 1060 | theoreticalKinetic += pseudoParticle[6].GetKineticEnergy()/MeV; |
---|
| 1061 | } |
---|
| 1062 | } |
---|
| 1063 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1064 | } |
---|
| 1065 | // |
---|
| 1066 | // Make sure, that the kinetic energies are correct |
---|
| 1067 | // |
---|
| 1068 | if( simulatedKinetic != 0.0 ) |
---|
| 1069 | { |
---|
| 1070 | wgt = (theoreticalKinetic)/simulatedKinetic; |
---|
| 1071 | theoreticalKinetic = currentParticle.GetKineticEnergy()/MeV * wgt; |
---|
| 1072 | simulatedKinetic = theoreticalKinetic; |
---|
| 1073 | currentParticle.SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
| 1074 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
| 1075 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 1076 | if( pp1 < 1.0e-6*GeV ) { |
---|
| 1077 | G4ThreeVector iso = Isotropic(pp); |
---|
| 1078 | currentParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 1079 | } else { |
---|
| 1080 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 1081 | } |
---|
| 1082 | theoreticalKinetic = targetParticle.GetKineticEnergy()/MeV * wgt; |
---|
| 1083 | targetParticle.SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
| 1084 | simulatedKinetic += theoreticalKinetic; |
---|
| 1085 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
| 1086 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
| 1087 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1088 | if( pp1 < 1.0e-6*GeV ) { |
---|
| 1089 | G4ThreeVector iso = Isotropic(pp); |
---|
| 1090 | targetParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 1091 | } else { |
---|
| 1092 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 1093 | } |
---|
| 1094 | |
---|
| 1095 | for( i=0; i<vecLen; ++i ) { |
---|
| 1096 | theoreticalKinetic = vec[i]->GetKineticEnergy()/MeV * wgt; |
---|
| 1097 | simulatedKinetic += theoreticalKinetic; |
---|
| 1098 | vec[i]->SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
| 1099 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
| 1100 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
| 1101 | if( pp1 < 1.0e-6*GeV ) { |
---|
| 1102 | G4ThreeVector iso = Isotropic(pp); |
---|
| 1103 | vec[i]->SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 1104 | } else { |
---|
| 1105 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
| 1106 | } |
---|
| 1107 | } |
---|
| 1108 | } |
---|
| 1109 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1110 | |
---|
| 1111 | Rotate( numberofFinalStateNucleons, pseudoParticle[3].GetMomentum(), |
---|
| 1112 | modifiedOriginal, originalIncident, targetNucleus, |
---|
| 1113 | currentParticle, targetParticle, vec, vecLen ); |
---|
| 1114 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1115 | // |
---|
| 1116 | // add black track particles |
---|
| 1117 | // the total number of particles produced is restricted to 198 |
---|
| 1118 | // this may have influence on very high energies |
---|
| 1119 | // |
---|
| 1120 | if( atomicWeight >= 1.5 ) |
---|
| 1121 | { |
---|
| 1122 | // npnb is number of proton/neutron black track particles |
---|
| 1123 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
| 1124 | // epnb is the kinetic energy available for proton/neutron black track particles |
---|
| 1125 | // edta is the kinetic energy available for deuteron/triton/alpha particles |
---|
| 1126 | // |
---|
| 1127 | G4int npnb = 0; |
---|
| 1128 | G4int ndta = 0; |
---|
| 1129 | |
---|
| 1130 | G4double epnb, edta; |
---|
| 1131 | if (veryForward) { |
---|
| 1132 | epnb = targetNucleus.GetAnnihilationPNBlackTrackEnergy(); |
---|
| 1133 | edta = targetNucleus.GetAnnihilationDTABlackTrackEnergy(); |
---|
| 1134 | } else { |
---|
| 1135 | epnb = targetNucleus.GetPNBlackTrackEnergy(); |
---|
| 1136 | edta = targetNucleus.GetDTABlackTrackEnergy(); |
---|
| 1137 | } |
---|
| 1138 | |
---|
| 1139 | const G4double pnCutOff = 0.001; |
---|
| 1140 | const G4double dtaCutOff = 0.001; |
---|
| 1141 | const G4double kineticMinimum = 1.e-6; |
---|
| 1142 | const G4double kineticFactor = -0.010; |
---|
| 1143 | G4double sprob = 0.0; // sprob = probability of self-absorption in heavy molecules |
---|
| 1144 | const G4double ekIncident = originalIncident->GetKineticEnergy()/GeV; |
---|
| 1145 | if( ekIncident >= 5.0 )sprob = std::min( 1.0, 0.6*std::log(ekIncident-4.0) ); |
---|
| 1146 | if( epnb >= pnCutOff ) |
---|
| 1147 | { |
---|
| 1148 | npnb = G4Poisson((1.5+1.25*numberofFinalStateNucleons)*epnb/(epnb+edta)); |
---|
| 1149 | if( numberofFinalStateNucleons + npnb > atomicWeight ) |
---|
| 1150 | npnb = G4int(atomicWeight+0.00001 - numberofFinalStateNucleons); |
---|
| 1151 | npnb = std::min( npnb, 127-vecLen ); |
---|
| 1152 | } |
---|
| 1153 | if( edta >= dtaCutOff ) |
---|
| 1154 | { |
---|
| 1155 | ndta = G4Poisson( (1.5+1.25*numberofFinalStateNucleons)*edta/(epnb+edta) ); |
---|
| 1156 | ndta = std::min( ndta, 127-vecLen ); |
---|
| 1157 | } |
---|
| 1158 | if (npnb == 0 && ndta == 0) npnb = 1; |
---|
| 1159 | |
---|
| 1160 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 1161 | |
---|
| 1162 | AddBlackTrackParticles(epnb, npnb, edta, ndta, sprob, kineticMinimum, |
---|
| 1163 | kineticFactor, modifiedOriginal, |
---|
| 1164 | PinNucleus, NinNucleus, targetNucleus, |
---|
| 1165 | vec, vecLen); |
---|
| 1166 | } |
---|
| 1167 | // if( centerofmassEnergy <= (4.0+G4UniformRand()) ) |
---|
| 1168 | // MomentumCheck( modifiedOriginal, currentParticle, targetParticle, |
---|
| 1169 | // vec, vecLen ); |
---|
| 1170 | // |
---|
| 1171 | // calculate time delay for nuclear reactions |
---|
| 1172 | // |
---|
| 1173 | if( (atomicWeight >= 1.5) && (atomicWeight <= 230.0) && (ekOriginal <= 0.2) ) |
---|
| 1174 | currentParticle.SetTOF( |
---|
| 1175 | 1.0-500.0*std::exp(-ekOriginal/0.04)*std::log(G4UniformRand()) ); |
---|
| 1176 | else |
---|
| 1177 | currentParticle.SetTOF( 1.0 ); |
---|
| 1178 | return true; |
---|
| 1179 | |
---|
| 1180 | } |
---|
| 1181 | |
---|
| 1182 | /* end of file */ |
---|