[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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[962] | 26 | // $Id: G4RPGFragmentation.cc,v 1.6 2008/06/09 18:13:16 dennis Exp $ |
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[1007] | 27 | // GEANT4 tag $Name: geant4-09-02 $ |
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[819] | 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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[962] | 78 | // Based on H. Fesefeldt's original FORTRAN code GENXPT |
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[819] | 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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[962] | 91 | if (vecLen == 0) return false; |
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[819] | 92 | |
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[962] | 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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[819] | 98 | |
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[962] | 99 | G4int i, l; |
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| 100 | G4bool veryForward = false; |
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[819] | 101 | |
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[962] | 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 | G4int itemp = G4int( G4UniformRand()*vecLen ); |
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| 118 | G4ReactionProduct pTemp = *vec[itemp]; |
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| 119 | *vec[itemp] = *vec[i]; |
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| 120 | *vec[i] = pTemp; |
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| 121 | } |
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| 122 | |
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| 123 | if (currentMass == 0.0 && targetMass == 0.0) { |
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| 124 | // Target and projectile have annihilated. Replace them with the first |
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| 125 | // two secondaries in the list. Current particle KE is maintained. |
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| 126 | |
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| 127 | G4double ek = currentParticle.GetKineticEnergy(); |
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| 128 | G4ThreeVector m = currentParticle.GetMomentum(); |
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| 129 | currentParticle = *vec[0]; |
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| 130 | currentParticle.SetSide(1); |
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| 131 | targetParticle = *vec[1]; |
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| 132 | targetParticle.SetSide(-1); |
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| 133 | for( i=0; i<(vecLen-2); ++i )*vec[i] = *vec[i+2]; |
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| 134 | G4ReactionProduct *temp = vec[vecLen-1]; |
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| 135 | delete temp; |
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| 136 | temp = vec[vecLen-2]; |
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| 137 | delete temp; |
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| 138 | vecLen -= 2; |
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| 139 | currentMass = currentParticle.GetMass()/GeV; |
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[819] | 140 | targetMass = targetParticle.GetMass()/GeV; |
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[962] | 141 | incidentHasChanged = true; |
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| 142 | targetHasChanged = true; |
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| 143 | currentParticle.SetKineticEnergy( ek ); |
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| 144 | currentParticle.SetMomentum( m ); |
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| 145 | veryForward = true; |
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| 146 | } |
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| 147 | const G4double atomicWeight = targetNucleus.GetN(); |
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| 148 | const G4double atomicNumber = targetNucleus.GetZ(); |
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| 149 | const G4double protonMass = aProton->GetPDGMass(); |
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| 150 | |
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| 151 | if (originalIncident->GetDefinition()->GetParticleSubType() == "kaon" |
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| 152 | && G4UniformRand() >= 0.7) { |
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| 153 | G4ReactionProduct temp = currentParticle; |
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| 154 | currentParticle = targetParticle; |
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| 155 | targetParticle = temp; |
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| 156 | incidentHasChanged = true; |
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| 157 | targetHasChanged = true; |
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| 158 | currentMass = currentParticle.GetMass()/GeV; |
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| 159 | targetMass = targetParticle.GetMass()/GeV; |
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| 160 | } |
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| 161 | const G4double afc = std::min( 0.75, |
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| 162 | 0.312+0.200*std::log(std::log(centerofmassEnergy*centerofmassEnergy))+ |
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| 163 | std::pow(centerofmassEnergy*centerofmassEnergy,1.5)/6000.0 ); |
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| 164 | |
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| 165 | G4double freeEnergy = centerofmassEnergy-currentMass-targetMass; |
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| 166 | G4double forwardEnergy = freeEnergy/2.; |
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| 167 | G4int forwardCount = 1; // number of particles in forward hemisphere |
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| 168 | |
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| 169 | G4double backwardEnergy = freeEnergy/2.; |
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| 170 | G4int backwardCount = 1; // number of particles in backward hemisphere |
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| 171 | |
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| 172 | if(veryForward) { |
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| 173 | if(currentParticle.GetSide()==-1) |
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[819] | 174 | { |
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[962] | 175 | forwardEnergy += currentMass; |
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| 176 | forwardCount --; |
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| 177 | backwardEnergy -= currentMass; |
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| 178 | backwardCount ++; |
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[819] | 179 | } |
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[962] | 180 | if(targetParticle.GetSide()!=-1) |
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[819] | 181 | { |
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[962] | 182 | backwardEnergy += targetMass; |
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| 183 | backwardCount --; |
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| 184 | forwardEnergy -= targetMass; |
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| 185 | forwardCount ++; |
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[819] | 186 | } |
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[962] | 187 | } |
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[819] | 188 | |
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[962] | 189 | for (i=0; i<vecLen; ++i) { |
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| 190 | if( vec[i]->GetSide() == -1 ) |
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| 191 | { |
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| 192 | ++backwardCount; |
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| 193 | backwardEnergy -= vec[i]->GetMass()/GeV; |
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| 194 | } else { |
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| 195 | ++forwardCount; |
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| 196 | forwardEnergy -= vec[i]->GetMass()/GeV; |
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[819] | 197 | } |
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[962] | 198 | } |
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[819] | 199 | |
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[962] | 200 | // Check that sum of forward particle masses does not exceed forwardEnergy, |
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| 201 | // and similarly for backward particles. If so, move particles from one |
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| 202 | // hemisphere to another. |
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| 203 | |
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| 204 | if (backwardEnergy < 0.0) { |
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| 205 | for (i = 0; i < vecLen; ++i) { |
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| 206 | if (vec[i]->GetSide() == -1) { |
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| 207 | backwardEnergy += vec[i]->GetMass()/GeV; |
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| 208 | --backwardCount; |
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| 209 | vec[i]->SetSide(1); |
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| 210 | forwardEnergy -= vec[i]->GetMass()/GeV; |
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| 211 | ++forwardCount; |
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| 212 | if (backwardEnergy > 0.0) break; |
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[819] | 213 | } |
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| 214 | } |
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[962] | 215 | } |
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[819] | 216 | |
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[962] | 217 | if (forwardEnergy < 0.0) { |
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| 218 | for (i = 0; i < vecLen; ++i) { |
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| 219 | if (vec[i]->GetSide() == 1) { |
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| 220 | forwardEnergy += vec[i]->GetMass()/GeV; |
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| 221 | --forwardCount; |
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| 222 | vec[i]->SetSide(-1); |
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| 223 | backwardEnergy -= vec[i]->GetMass()/GeV; |
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[819] | 224 | ++backwardCount; |
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[962] | 225 | if (forwardEnergy > 0.0) break; |
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[819] | 226 | } |
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| 227 | } |
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[962] | 228 | } |
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| 229 | |
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| 230 | // Special cases for reactions near threshold |
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| 231 | |
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| 232 | // 1. There is only one secondary |
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| 233 | if (forwardEnergy > 0.0 && backwardEnergy < 0.0) { |
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| 234 | forwardEnergy += backwardEnergy; |
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| 235 | backwardEnergy = 0; |
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| 236 | } |
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| 237 | |
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| 238 | // 2. Nuclear binding energy is large |
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| 239 | if (forwardEnergy + backwardEnergy < 0.0) return false; |
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| 240 | |
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| 241 | |
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| 242 | // forwardEnergy now represents the total energy in the forward reaction |
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| 243 | // hemisphere which is available for kinetic energy and particle creation. |
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| 244 | // Similarly for backwardEnergy. |
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| 245 | |
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| 246 | // Add particles from the intranuclear cascade. |
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| 247 | // nuclearExcitationCount = number of new secondaries produced by nuclear |
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| 248 | // excitation |
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| 249 | // extraCount = number of nucleons within these new secondaries |
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| 250 | // |
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| 251 | // Note: eventually have to make sure that enough nucleons are available |
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| 252 | // in the case of small target nuclei |
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| 253 | |
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| 254 | G4double xtarg; |
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| 255 | if( centerofmassEnergy < (2.0+G4UniformRand()) ) |
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| 256 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2.0*backwardCount+vecLen+2)/2.0; |
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| 257 | else |
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| 258 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2.0*backwardCount); |
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| 259 | if( xtarg <= 0.0 )xtarg = 0.01; |
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| 260 | G4int nuclearExcitationCount = G4Poisson( xtarg ); |
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| 261 | // To do: try reducing nuclearExcitationCount with increasing energy |
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| 262 | // to simulate cut-off of cascade |
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| 263 | if(atomicWeight<1.0001) nuclearExcitationCount = 0; |
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| 264 | G4int extraNucleonCount = 0; |
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| 265 | G4double extraNucleonMass = 0.0; |
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| 266 | |
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| 267 | if (nuclearExcitationCount > 0) { |
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| 268 | const G4double nucsup[] = { 1.00, 0.7, 0.5, 0.4, 0.35, 0.3 }; |
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| 269 | const G4double psup[] = { 3., 6., 20., 50., 100., 1000. }; |
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| 270 | G4int momentumBin = 0; |
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| 271 | while( (momentumBin < 6) && |
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| 272 | (modifiedOriginal.GetTotalMomentum()/GeV > psup[momentumBin]) ) |
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| 273 | ++momentumBin; |
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| 274 | momentumBin = std::min( 5, momentumBin ); |
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| 275 | |
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| 276 | // NOTE: in GENXPT, these new particles were given negative codes |
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| 277 | // here I use NewlyAdded = true instead |
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[819] | 278 | // |
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| 279 | |
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[962] | 280 | for (i = 0; i < nuclearExcitationCount; ++i) { |
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| 281 | G4ReactionProduct * pVec = new G4ReactionProduct(); |
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| 282 | if (G4UniformRand() < nucsup[momentumBin]) { |
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| 283 | |
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| 284 | if (G4UniformRand() > 1.0-atomicNumber/atomicWeight) |
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| 285 | pVec->SetDefinition( aProton ); |
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[819] | 286 | else |
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[962] | 287 | pVec->SetDefinition( aNeutron ); |
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| 288 | |
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| 289 | // nucleon comes from nucleus - |
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| 290 | // do not subtract its mass from backward energy |
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| 291 | pVec->SetSide( -2 ); // -2 means backside nucleon |
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| 292 | ++extraNucleonCount; |
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| 293 | extraNucleonMass += pVec->GetMass()/GeV; |
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| 294 | // To do: Remove chosen nucleon from target nucleus |
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| 295 | pVec->SetNewlyAdded( true ); |
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[819] | 296 | vec.SetElement( vecLen++, pVec ); |
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| 297 | ++backwardCount; |
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[962] | 298 | |
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| 299 | } else { |
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| 300 | |
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| 301 | G4double ran = G4UniformRand(); |
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| 302 | if( ran < 0.3181 ) |
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| 303 | pVec->SetDefinition( aPiPlus ); |
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| 304 | else if( ran < 0.6819 ) |
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| 305 | pVec->SetDefinition( aPiZero ); |
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| 306 | else |
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| 307 | pVec->SetDefinition( aPiMinus ); |
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| 308 | |
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| 309 | if (backwardEnergy > pVec->GetMass()/GeV) { |
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| 310 | backwardEnergy -= pVec->GetMass()/GeV; // pion mass comes from free energy |
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| 311 | ++backwardCount; |
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| 312 | pVec->SetSide( -1 ); // backside particle, but not a nucleon |
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| 313 | pVec->SetNewlyAdded( true ); |
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| 314 | vec.SetElement( vecLen++, pVec ); |
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| 315 | } |
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| 316 | |
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| 317 | // To do: Change proton to neutron (or vice versa) in target nucleus depending |
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| 318 | // on pion charge |
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[819] | 319 | } |
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| 320 | } |
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[962] | 321 | } |
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[819] | 322 | |
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[962] | 323 | // Define initial state vectors for Lorentz transformations |
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| 324 | // The pseudoParticles have non-standard masses, hence the "pseudo" |
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[819] | 325 | |
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[962] | 326 | G4ReactionProduct pseudoParticle[8]; |
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| 327 | for (i = 0; i < 8; ++i) pseudoParticle[i].SetZero(); |
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| 328 | |
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| 329 | pseudoParticle[0].SetMass( mOriginal*GeV ); |
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| 330 | pseudoParticle[0].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
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| 331 | pseudoParticle[0].SetTotalEnergy( |
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| 332 | std::sqrt( pOriginal*pOriginal + mOriginal*mOriginal )*GeV ); |
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[819] | 333 | |
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[962] | 334 | pseudoParticle[1].SetMass(protonMass); // this could be targetMass |
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| 335 | pseudoParticle[1].SetTotalEnergy(protonMass); |
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[819] | 336 | |
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[962] | 337 | pseudoParticle[3].SetMass(protonMass*(1+extraNucleonCount) ); |
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| 338 | pseudoParticle[3].SetTotalEnergy(protonMass*(1+extraNucleonCount) ); |
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[819] | 339 | |
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[962] | 340 | pseudoParticle[2] = pseudoParticle[0] + pseudoParticle[1]; |
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| 341 | pseudoParticle[3] = pseudoParticle[3] + pseudoParticle[0]; |
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[819] | 342 | |
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[962] | 343 | pseudoParticle[0].Lorentz( pseudoParticle[0], pseudoParticle[2] ); |
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| 344 | pseudoParticle[1].Lorentz( pseudoParticle[1], pseudoParticle[2] ); |
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[819] | 345 | |
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[962] | 346 | // Main loop for 4-momentum generation |
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| 347 | // See Pitha-report (Aachen) for a detailed description of the method |
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| 348 | |
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| 349 | G4double aspar, pt, et, x, pp, pp1, wgt; |
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| 350 | G4int innerCounter, outerCounter; |
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| 351 | G4bool eliminateThisParticle, resetEnergies, constantCrossSection; |
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[819] | 352 | |
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[962] | 353 | G4double forwardKinetic = 0.0; |
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| 354 | G4double backwardKinetic = 0.0; |
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[819] | 355 | |
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[962] | 356 | // Process the secondary particles in reverse order |
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| 357 | // The incident particle is done after the secondaries |
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| 358 | // Nucleons, including the target, in the backward hemisphere are also |
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| 359 | // done later |
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| 360 | |
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| 361 | G4int backwardNucleonCount = 0; // number of nucleons in backward hemisphere |
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| 362 | G4double totalEnergy, kineticEnergy, vecMass; |
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| 363 | G4double phi; |
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| 364 | |
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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]->GetNewlyAdded()) { // added from intranuclear cascade |
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| 368 | if (vec[i]->GetSide() == -2) { // its a nucleon |
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| 369 | if (backwardNucleonCount < 18) { |
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| 370 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
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| 371 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
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| 372 | vecLen = 0; |
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| 373 | throw G4HadReentrentException(__FILE__, __LINE__, |
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| 374 | "G4RPGFragmentation::ReactionStage : a pion has been counted as a backward nucleon"); |
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[819] | 375 | } |
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[962] | 376 | vec[i]->SetSide(-3); |
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| 377 | ++backwardNucleonCount; |
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| 378 | continue; // Don't generate momenta for the first 17 backward |
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| 379 | // cascade nucleons. This gets done by the cluster |
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| 380 | // model later on. |
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[819] | 381 | } |
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| 382 | } |
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[962] | 383 | } |
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[819] | 384 | |
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[962] | 385 | // Set pt and phi values, they are changed somewhat in the iteration loop |
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| 386 | // Set mass parameter for lambda fragmentation model |
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[819] | 387 | |
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[962] | 388 | vecMass = vec[i]->GetMass()/GeV; |
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| 389 | G4double ran = -std::log(1.0-G4UniformRand())/3.5; |
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| 390 | |
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| 391 | if (vec[i]->GetSide() == -2) { // backward nucleon |
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| 392 | aspar = 0.20; |
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| 393 | pt = std::sqrt( std::pow( ran, 1.2 ) ); |
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| 394 | |
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| 395 | } else { // not a backward nucleon |
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| 396 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
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| 397 | aspar = 0.75; |
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| 398 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
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| 399 | } else if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
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| 400 | aspar = 0.70; |
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| 401 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
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| 402 | } else { // vec[i] must be a baryon or ion |
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| 403 | aspar = 0.65; |
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| 404 | pt = std::sqrt( std::pow( ran, 1.5 ) ); |
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[819] | 405 | } |
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[962] | 406 | } |
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| 407 | |
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| 408 | pt = std::max( 0.001, pt ); |
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| 409 | phi = G4UniformRand()*twopi; |
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| 410 | vec[i]->SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
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| 411 | if (vec[i]->GetSide() > 0) |
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| 412 | et = pseudoParticle[0].GetTotalEnergy()/GeV; |
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| 413 | else |
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| 414 | et = pseudoParticle[1].GetTotalEnergy()/GeV; |
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| 415 | |
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| 416 | // |
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| 417 | // Start of outer iteration loop |
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| 418 | // |
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| 419 | outerCounter = 0; |
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| 420 | eliminateThisParticle = true; |
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| 421 | resetEnergies = true; |
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| 422 | dndl[0] = 0.0; |
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| 423 | |
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| 424 | while (++outerCounter < 3) { |
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| 425 | |
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| 426 | FragmentationIntegral(pt, et, aspar, vecMass); |
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| 427 | innerCounter = 0; |
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[819] | 428 | vec[i]->SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
| 429 | |
---|
[962] | 430 | // Start of inner iteration loop |
---|
[819] | 431 | |
---|
[962] | 432 | while (++innerCounter < 7) { |
---|
[819] | 433 | |
---|
[962] | 434 | ran = G4UniformRand()*dndl[19]; |
---|
| 435 | l = 1; |
---|
| 436 | while( ( ran > dndl[l] ) && ( l < 19 ) ) l++; |
---|
| 437 | x = (G4double(l-1) + G4UniformRand())/19.; |
---|
| 438 | if (vec[i]->GetSide() < 0) x *= -1.; |
---|
| 439 | vec[i]->SetMomentum( x*et*GeV ); // set the z-momentum |
---|
| 440 | totalEnergy = std::sqrt( x*et*x*et + pt*pt + vecMass*vecMass ); |
---|
| 441 | vec[i]->SetTotalEnergy( totalEnergy*GeV ); |
---|
| 442 | kineticEnergy = vec[i]->GetKineticEnergy()/GeV; |
---|
| 443 | |
---|
| 444 | if (vec[i]->GetSide() > 0) { // forward side |
---|
| 445 | if( (forwardKinetic+kineticEnergy) < 0.95*forwardEnergy ) { |
---|
| 446 | // Leave at least 5% of the forward free energy for the projectile |
---|
| 447 | |
---|
| 448 | pseudoParticle[4] = pseudoParticle[4] + (*vec[i]); |
---|
| 449 | forwardKinetic += kineticEnergy; |
---|
| 450 | outerCounter = 2; // leave outer loop |
---|
| 451 | eliminateThisParticle = false; // don't eliminate this particle |
---|
| 452 | resetEnergies = false; |
---|
| 453 | break; // leave inner loop |
---|
| 454 | } |
---|
| 455 | if( innerCounter > 5 )break; // leave inner loop |
---|
| 456 | if( backwardEnergy >= vecMass ) // switch sides |
---|
[819] | 457 | { |
---|
[962] | 458 | vec[i]->SetSide(-1); |
---|
| 459 | forwardEnergy += vecMass; |
---|
| 460 | backwardEnergy -= vecMass; |
---|
| 461 | ++backwardCount; |
---|
[819] | 462 | } |
---|
[962] | 463 | } else { // backward side |
---|
| 464 | // if (extraNucleonCount > 19) x = 0.999; |
---|
| 465 | // G4double xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
| 466 | // DHW: I think above lines were meant to be as follows: |
---|
| 467 | G4double xxx = 0.999; |
---|
| 468 | if (extraNucleonCount < 20) xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
[819] | 469 | |
---|
[962] | 470 | if ((backwardKinetic+kineticEnergy) < xxx*backwardEnergy) { |
---|
| 471 | pseudoParticle[5] = pseudoParticle[5] + (*vec[i]); |
---|
| 472 | backwardKinetic += kineticEnergy; |
---|
| 473 | outerCounter = 2; // leave outer loop |
---|
| 474 | eliminateThisParticle = false; // don't eliminate this particle |
---|
| 475 | resetEnergies = false; |
---|
| 476 | break; // leave inner loop |
---|
| 477 | } |
---|
| 478 | if (innerCounter > 5) break; // leave inner loop |
---|
| 479 | if (forwardEnergy >= vecMass) { // switch sides |
---|
| 480 | vec[i]->SetSide(1); |
---|
| 481 | forwardEnergy -= vecMass; |
---|
| 482 | backwardEnergy += vecMass; |
---|
| 483 | backwardCount--; |
---|
| 484 | } |
---|
| 485 | } |
---|
| 486 | G4ThreeVector momentum = vec[i]->GetMomentum(); |
---|
| 487 | vec[i]->SetMomentum( momentum.x() * 0.9, momentum.y() * 0.9 ); |
---|
| 488 | pt *= 0.9; |
---|
| 489 | dndl[19] *= 0.9; |
---|
| 490 | } // closes inner loop |
---|
| 491 | |
---|
| 492 | // If we get here, the inner loop has been done 6 times. |
---|
| 493 | // If necessary, reduce energies of the previously done particles if |
---|
| 494 | // they are lighter than protons or are in the forward hemisphere. |
---|
| 495 | // Then continue with outer loop. |
---|
| 496 | |
---|
| 497 | if (resetEnergies) |
---|
| 498 | ReduceEnergiesOfSecondaries(i+1, forwardKinetic, backwardKinetic, |
---|
| 499 | vec, vecLen, |
---|
| 500 | pseudoParticle[4], pseudoParticle[5], |
---|
| 501 | pt); |
---|
| 502 | |
---|
| 503 | } // closes outer loop |
---|
[819] | 504 | |
---|
[962] | 505 | if (eliminateThisParticle && vec[i]->GetMayBeKilled()) { |
---|
| 506 | // not enough energy, eliminate this particle |
---|
| 507 | |
---|
| 508 | if (vec[i]->GetSide() > 0) { |
---|
| 509 | --forwardCount; |
---|
| 510 | forwardEnergy += vecMass; |
---|
| 511 | } else { |
---|
| 512 | --backwardCount; |
---|
| 513 | if (vec[i]->GetSide() == -2) { |
---|
| 514 | --extraNucleonCount; |
---|
| 515 | extraNucleonMass -= vecMass; |
---|
[819] | 516 | } else { |
---|
| 517 | backwardEnergy += vecMass; |
---|
[962] | 518 | } |
---|
[819] | 519 | } |
---|
| 520 | |
---|
[962] | 521 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
| 522 | G4ReactionProduct* temp = vec[vecLen-1]; |
---|
| 523 | delete temp; |
---|
| 524 | // To do: modify target nucleus according to particle eliminated |
---|
| 525 | |
---|
| 526 | if( --vecLen == 0 ){ |
---|
| 527 | G4cout << " FALSE RETURN DUE TO ENERGY BALANCE " << G4endl; |
---|
| 528 | return false; |
---|
| 529 | } // all the secondaries have been eliminated |
---|
[819] | 530 | } |
---|
[962] | 531 | } // closes main loop over secondaries |
---|
[819] | 532 | |
---|
[962] | 533 | // Re-balance forward and backward energy if possible and if necessary |
---|
| 534 | |
---|
| 535 | G4double forwardKEDiff = forwardEnergy - forwardKinetic; |
---|
| 536 | G4double backwardKEDiff = backwardEnergy - backwardKinetic; |
---|
| 537 | |
---|
| 538 | if (forwardKEDiff < 0.0 || backwardKEDiff < 0.0) { |
---|
| 539 | ReduceEnergiesOfSecondaries(0, forwardKinetic, backwardKinetic, |
---|
| 540 | vec, vecLen, |
---|
| 541 | pseudoParticle[4], pseudoParticle[5], |
---|
| 542 | pt); |
---|
| 543 | |
---|
| 544 | forwardKEDiff = forwardEnergy - forwardKinetic; |
---|
| 545 | backwardKEDiff = backwardEnergy - backwardKinetic; |
---|
| 546 | if (backwardKEDiff < 0.0) { |
---|
| 547 | if (forwardKEDiff + backwardKEDiff > 0.0) { |
---|
| 548 | backwardEnergy = backwardKinetic; |
---|
| 549 | forwardEnergy += backwardKEDiff; |
---|
| 550 | forwardKEDiff = forwardEnergy - forwardKinetic; |
---|
| 551 | backwardKEDiff = 0.0; |
---|
| 552 | } else { |
---|
| 553 | G4cout << " False return due to insufficient backward energy " << G4endl; |
---|
| 554 | return false; |
---|
| 555 | } |
---|
| 556 | } |
---|
| 557 | |
---|
| 558 | if (forwardKEDiff < 0.0) { |
---|
| 559 | if (forwardKEDiff + backwardKEDiff > 0.0) { |
---|
| 560 | forwardEnergy = forwardKinetic; |
---|
| 561 | backwardEnergy += forwardKEDiff; |
---|
| 562 | backwardKEDiff = backwardEnergy - backwardKinetic; |
---|
| 563 | forwardKEDiff = 0.0; |
---|
| 564 | } else { |
---|
| 565 | G4cout << " False return due to insufficient forward energy " << G4endl; |
---|
| 566 | return false; |
---|
| 567 | } |
---|
| 568 | } |
---|
| 569 | } |
---|
| 570 | |
---|
| 571 | // Generate momentum for incident (current) particle, which was placed |
---|
| 572 | // in the forward hemisphere. |
---|
| 573 | // Set mass parameter for lambda fragmentation model. |
---|
| 574 | // Set pt and phi values, which are changed somewhat in the iteration loop |
---|
| 575 | |
---|
| 576 | G4double ran = -std::log(1.0-G4UniformRand()); |
---|
| 577 | if (currentParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
| 578 | aspar = 0.60; |
---|
| 579 | pt = std::sqrt( std::pow( ran/6.0, 1.7 ) ); |
---|
| 580 | } else if (currentParticle.GetDefinition()->GetParticleSubType() == "kaon") { |
---|
| 581 | aspar = 0.50; |
---|
| 582 | pt = std::sqrt( std::pow( ran/5.0, 1.4 ) ); |
---|
| 583 | } else { |
---|
| 584 | aspar = 0.40; |
---|
| 585 | pt = std::sqrt( std::pow( ran/4.0, 1.2 ) ); |
---|
| 586 | } |
---|
| 587 | |
---|
| 588 | phi = G4UniformRand()*twopi; |
---|
| 589 | currentParticle.SetMomentum(pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV); |
---|
| 590 | et = pseudoParticle[0].GetTotalEnergy()/GeV; |
---|
| 591 | dndl[0] = 0.0; |
---|
| 592 | vecMass = currentParticle.GetMass()/GeV; |
---|
| 593 | |
---|
| 594 | FragmentationIntegral(pt, et, aspar, vecMass); |
---|
| 595 | |
---|
| 596 | ran = G4UniformRand()*dndl[19]; |
---|
| 597 | l = 1; |
---|
| 598 | while( ( ran > dndl[l] ) && ( l < 19 ) ) l++; |
---|
| 599 | x = (G4double(l-1) + G4UniformRand())/19.; |
---|
| 600 | currentParticle.SetMomentum( x*et*GeV ); // set the z-momentum |
---|
| 601 | |
---|
| 602 | if (forwardEnergy < forwardKinetic) { |
---|
| 603 | totalEnergy = vecMass + 0.04*std::fabs(normal()); |
---|
| 604 | G4cout << " Not enough forward energy: forwardEnergy = " |
---|
| 605 | << forwardEnergy << " forwardKinetic = " |
---|
| 606 | << forwardKinetic << " total energy left = " |
---|
| 607 | << backwardKEDiff + forwardKEDiff << G4endl; |
---|
| 608 | } else { |
---|
| 609 | totalEnergy = vecMass + forwardEnergy - forwardKinetic; |
---|
| 610 | forwardKinetic = forwardEnergy; |
---|
| 611 | } |
---|
| 612 | currentParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
| 613 | pp = std::sqrt(std::abs( totalEnergy*totalEnergy - vecMass*vecMass) )*GeV; |
---|
| 614 | pp1 = currentParticle.GetMomentum().mag(); |
---|
| 615 | |
---|
| 616 | if (pp1 < 1.0e-6*GeV) { |
---|
| 617 | G4ThreeVector iso = Isotropic(pp); |
---|
| 618 | currentParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 619 | } else { |
---|
| 620 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 621 | } |
---|
| 622 | pseudoParticle[4] = pseudoParticle[4] + currentParticle; |
---|
| 623 | |
---|
| 624 | // Current particle now finished |
---|
| 625 | |
---|
| 626 | // Begin target particle |
---|
| 627 | |
---|
| 628 | if (backwardNucleonCount < 18) { |
---|
| 629 | targetParticle.SetSide(-3); |
---|
| 630 | ++backwardNucleonCount; |
---|
| 631 | |
---|
| 632 | } else { |
---|
| 633 | // Set pt and phi values, they are changed somewhat in the iteration loop |
---|
| 634 | // Set mass parameter for lambda fragmentation model |
---|
| 635 | |
---|
| 636 | vecMass = targetParticle.GetMass()/GeV; |
---|
| 637 | ran = -std::log(1.0-G4UniformRand()); |
---|
| 638 | aspar = 0.40; |
---|
| 639 | pt = std::max( 0.001, std::sqrt( std::pow( ran/4.0, 1.2 ) ) ); |
---|
| 640 | phi = G4UniformRand()*twopi; |
---|
| 641 | targetParticle.SetMomentum(pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV); |
---|
| 642 | et = pseudoParticle[1].GetTotalEnergy()/GeV; |
---|
| 643 | outerCounter = 0; |
---|
| 644 | innerCounter = 0; |
---|
| 645 | G4bool marginalEnergy = true; |
---|
[819] | 646 | dndl[0] = 0.0; |
---|
[962] | 647 | G4double xxx = 0.999; |
---|
| 648 | if( extraNucleonCount < 20 ) xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
| 649 | G4ThreeVector momentum; |
---|
[819] | 650 | |
---|
[962] | 651 | while (++outerCounter < 4) { |
---|
| 652 | FragmentationIntegral(pt, et, aspar, vecMass); |
---|
[819] | 653 | |
---|
[962] | 654 | for (innerCounter = 0; innerCounter < 6; innerCounter++) { |
---|
| 655 | ran = G4UniformRand()*dndl[19]; |
---|
| 656 | l = 1; |
---|
| 657 | while( ( ran > dndl[l] ) && ( l < 19 ) ) l++; |
---|
| 658 | x = -(G4double(l-1) + G4UniformRand())/19.; |
---|
| 659 | targetParticle.SetMomentum( x*et*GeV ); // set the z-momentum |
---|
| 660 | totalEnergy = std::sqrt(x*et*x*et + pt*pt + vecMass*vecMass); |
---|
| 661 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
[819] | 662 | |
---|
[962] | 663 | if ((backwardKinetic+totalEnergy-vecMass) < xxx*backwardEnergy) { |
---|
| 664 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
| 665 | backwardKinetic += totalEnergy - vecMass; |
---|
| 666 | outerCounter = 3; // leave outer loop |
---|
| 667 | marginalEnergy = false; |
---|
| 668 | break; // leave inner loop |
---|
| 669 | } |
---|
| 670 | momentum = targetParticle.GetMomentum(); |
---|
| 671 | targetParticle.SetMomentum(momentum.x() * 0.9, momentum.y() * 0.9); |
---|
| 672 | pt *= 0.9; |
---|
| 673 | dndl[19] *= 0.9; |
---|
| 674 | } |
---|
[819] | 675 | } |
---|
| 676 | |
---|
[962] | 677 | if (marginalEnergy) { |
---|
| 678 | G4cout << " Extra backward kinetic energy = " |
---|
| 679 | << 0.999*backwardEnergy - backwardKinetic << G4endl; |
---|
| 680 | totalEnergy = vecMass + 0.999*backwardEnergy - backwardKinetic; |
---|
| 681 | targetParticle.SetTotalEnergy(totalEnergy*GeV); |
---|
| 682 | pp = std::sqrt(std::abs(totalEnergy*totalEnergy - vecMass*vecMass) )*GeV; |
---|
| 683 | targetParticle.SetMomentum(momentum.x()/0.9, momentum.y()/0.9); |
---|
| 684 | pp1 = targetParticle.GetMomentum().mag(); |
---|
| 685 | targetParticle.SetMomentum(targetParticle.GetMomentum() * pp/pp1 ); |
---|
| 686 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
| 687 | backwardKinetic = 0.999*backwardEnergy; |
---|
[819] | 688 | } |
---|
| 689 | |
---|
[962] | 690 | } |
---|
[819] | 691 | |
---|
[962] | 692 | if (backwardEnergy < backwardKinetic) |
---|
| 693 | G4cout << " Backward Edif = " << backwardEnergy - backwardKinetic << G4endl; |
---|
| 694 | if (forwardEnergy != forwardKinetic) |
---|
| 695 | G4cout << " Forward Edif = " << forwardEnergy - forwardKinetic << G4endl; |
---|
[819] | 696 | |
---|
[962] | 697 | // Target particle finished. |
---|
| 698 | // Now produce backward nucleons with a cluster model |
---|
| 699 | // ps[2] = CM frame of projectile + target |
---|
| 700 | // ps[3] = sum of projectile + nucleon cluster in lab frame |
---|
| 701 | // ps[6] = proj + cluster 4-vector boosted into CM frame of proj + targ |
---|
| 702 | // with secondaries, current and target particles subtracted |
---|
| 703 | // = total 4-momentum of backward nucleon cluster |
---|
[819] | 704 | |
---|
[962] | 705 | pseudoParticle[6].Lorentz( pseudoParticle[3], pseudoParticle[2] ); |
---|
| 706 | pseudoParticle[6] = pseudoParticle[6] - pseudoParticle[4]; |
---|
| 707 | pseudoParticle[6] = pseudoParticle[6] - pseudoParticle[5]; |
---|
[819] | 708 | |
---|
[962] | 709 | if (backwardNucleonCount == 1) { |
---|
| 710 | // Target particle is the only backward nucleon. Give it the remainder |
---|
| 711 | // of the backward kinetic energy. |
---|
| 712 | |
---|
| 713 | G4double ekin = |
---|
| 714 | std::min(backwardEnergy-backwardKinetic, centerofmassEnergy/2.0-protonMass/GeV); |
---|
| 715 | |
---|
| 716 | if( ekin < 0.04 )ekin = 0.04 * std::fabs( normal() ); |
---|
| 717 | vecMass = targetParticle.GetMass()/GeV; |
---|
| 718 | totalEnergy = ekin + vecMass; |
---|
| 719 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
| 720 | pp = std::sqrt(std::abs(totalEnergy*totalEnergy - vecMass*vecMass) )*GeV; |
---|
| 721 | pp1 = pseudoParticle[6].GetMomentum().mag(); |
---|
| 722 | if (pp1 < 1.0e-6*GeV) { |
---|
| 723 | G4ThreeVector iso = Isotropic(pp); |
---|
| 724 | targetParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 725 | } else { |
---|
| 726 | targetParticle.SetMomentum( pseudoParticle[6].GetMomentum() * (pp/pp1)); |
---|
[819] | 727 | } |
---|
[962] | 728 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
[819] | 729 | |
---|
[962] | 730 | } else if (backwardNucleonCount > 1) { |
---|
| 731 | // Share remaining energy with up to 17 backward nucleons |
---|
| 732 | |
---|
| 733 | G4int tempCount = 5; |
---|
| 734 | if (backwardNucleonCount < 5) tempCount = backwardNucleonCount; |
---|
| 735 | tempCount -= 2; |
---|
| 736 | |
---|
| 737 | G4double clusterMass = 0.; |
---|
| 738 | if (targetParticle.GetSide() == -3) |
---|
| 739 | clusterMass = targetParticle.GetMass()/GeV; |
---|
| 740 | for (i = 0; i < vecLen; ++i) |
---|
| 741 | if (vec[i]->GetSide() == -3) clusterMass += vec[i]->GetMass()/GeV; |
---|
| 742 | clusterMass += backwardEnergy - backwardKinetic; |
---|
| 743 | |
---|
| 744 | totalEnergy = pseudoParticle[6].GetTotalEnergy()/GeV; |
---|
| 745 | pseudoParticle[6].SetMass(clusterMass*GeV); |
---|
| 746 | |
---|
| 747 | pp = std::sqrt(std::abs(totalEnergy*totalEnergy - |
---|
| 748 | clusterMass*clusterMass) )*GeV; |
---|
| 749 | pp1 = pseudoParticle[6].GetMomentum().mag(); |
---|
| 750 | if (pp1 < 1.0e-6*GeV) { |
---|
| 751 | G4ThreeVector iso = Isotropic(pp); |
---|
| 752 | pseudoParticle[6].SetMomentum(iso.x(), iso.y(), iso.z()); |
---|
| 753 | } else { |
---|
| 754 | pseudoParticle[6].SetMomentum(pseudoParticle[6].GetMomentum() * (-pp/pp1)); |
---|
[819] | 755 | } |
---|
| 756 | |
---|
[962] | 757 | std::vector<G4ReactionProduct*> tempList; // ptrs to backward nucleons |
---|
| 758 | if (targetParticle.GetSide() == -3) tempList.push_back(&targetParticle); |
---|
| 759 | for (i = 0; i < vecLen; ++i) |
---|
| 760 | if (vec[i]->GetSide() == -3) tempList.push_back(vec[i]); |
---|
[819] | 761 | |
---|
[962] | 762 | constantCrossSection = true; |
---|
| 763 | |
---|
| 764 | if (tempList.size() > 1) { |
---|
| 765 | G4int n_entry = 0; |
---|
| 766 | wgt = GenerateNBodyEventT(pseudoParticle[6].GetMass(), |
---|
| 767 | constantCrossSection, tempList); |
---|
| 768 | |
---|
| 769 | if (targetParticle.GetSide() == -3) { |
---|
| 770 | targetParticle = *tempList[0]; |
---|
| 771 | targetParticle.Lorentz(targetParticle, pseudoParticle[6]); |
---|
| 772 | n_entry++; |
---|
[819] | 773 | } |
---|
[962] | 774 | |
---|
| 775 | for (i = 0; i < vecLen; ++i) { |
---|
| 776 | if (vec[i]->GetSide() == -3) { |
---|
| 777 | *vec[i] = *tempList[n_entry]; |
---|
| 778 | vec[i]->Lorentz(*vec[i], pseudoParticle[6]); |
---|
| 779 | n_entry++; |
---|
[819] | 780 | } |
---|
| 781 | } |
---|
| 782 | } |
---|
[962] | 783 | } else return false; |
---|
[819] | 784 | |
---|
[962] | 785 | if (vecLen == 0) return false; // all the secondaries have been eliminated |
---|
[819] | 786 | |
---|
[962] | 787 | // Lorentz transformation to lab frame |
---|
[819] | 788 | |
---|
[962] | 789 | currentParticle.Lorentz( currentParticle, pseudoParticle[1] ); |
---|
| 790 | targetParticle.Lorentz( targetParticle, pseudoParticle[1] ); |
---|
| 791 | for (i = 0; i < vecLen; ++i) vec[i]->Lorentz(*vec[i], pseudoParticle[1]); |
---|
| 792 | |
---|
| 793 | // Set leading strange particle flag. |
---|
| 794 | // leadFlag will be true if original particle and incident particle are |
---|
| 795 | // both strange, in which case the incident particle becomes the leading |
---|
| 796 | // particle. |
---|
| 797 | // leadFlag will also be true if the target particle is strange, but the |
---|
| 798 | // incident particle is not, in which case the target particle becomes the |
---|
| 799 | // leading particle. |
---|
| 800 | |
---|
| 801 | G4bool leadingStrangeParticleHasChanged = true; |
---|
| 802 | if (leadFlag) |
---|
| 803 | { |
---|
| 804 | if (currentParticle.GetDefinition() == leadingStrangeParticle.GetDefinition()) |
---|
| 805 | leadingStrangeParticleHasChanged = false; |
---|
| 806 | if (leadingStrangeParticleHasChanged && |
---|
| 807 | (targetParticle.GetDefinition() == leadingStrangeParticle.GetDefinition()) ) |
---|
| 808 | leadingStrangeParticleHasChanged = false; |
---|
| 809 | if( leadingStrangeParticleHasChanged ) |
---|
[819] | 810 | { |
---|
[962] | 811 | for( i=0; i<vecLen; i++ ) |
---|
[819] | 812 | { |
---|
[962] | 813 | if( vec[i]->GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
[819] | 814 | { |
---|
[962] | 815 | leadingStrangeParticleHasChanged = false; |
---|
| 816 | break; |
---|
[819] | 817 | } |
---|
| 818 | } |
---|
[962] | 819 | } |
---|
| 820 | if( leadingStrangeParticleHasChanged ) |
---|
| 821 | { |
---|
| 822 | G4bool leadTest = |
---|
| 823 | (leadingStrangeParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 824 | leadingStrangeParticle.GetDefinition()->GetParticleSubType() == "pi"); |
---|
| 825 | G4bool targetTest = |
---|
| 826 | (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
| 827 | targetParticle.GetDefinition()->GetParticleSubType() == "pi"); |
---|
[819] | 828 | |
---|
[962] | 829 | // following modified by JLC 22-Oct-97 |
---|
[819] | 830 | |
---|
[962] | 831 | if( (leadTest&&targetTest) || !(leadTest||targetTest) ) // both true or both false |
---|
| 832 | { |
---|
| 833 | targetParticle.SetDefinitionAndUpdateE( leadingStrangeParticle.GetDefinition() ); |
---|
| 834 | targetHasChanged = true; |
---|
[819] | 835 | } |
---|
[962] | 836 | else |
---|
| 837 | { |
---|
| 838 | currentParticle.SetDefinitionAndUpdateE( leadingStrangeParticle.GetDefinition() ); |
---|
| 839 | incidentHasChanged = false; |
---|
| 840 | } |
---|
| 841 | } |
---|
| 842 | } // end of if( leadFlag ) |
---|
[819] | 843 | |
---|
[962] | 844 | // Get number of final state nucleons and nucleons remaining in |
---|
| 845 | // target nucleus |
---|
[819] | 846 | |
---|
[962] | 847 | std::pair<G4int, G4int> finalStateNucleons = |
---|
| 848 | GetFinalStateNucleons(originalTarget, vec, vecLen); |
---|
[819] | 849 | |
---|
[962] | 850 | G4int protonsInFinalState = finalStateNucleons.first; |
---|
| 851 | G4int neutronsInFinalState = finalStateNucleons.second; |
---|
[819] | 852 | |
---|
[962] | 853 | G4int numberofFinalStateNucleons = |
---|
| 854 | protonsInFinalState + neutronsInFinalState; |
---|
[819] | 855 | |
---|
[962] | 856 | if (currentParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
| 857 | targetParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
| 858 | originalIncident->GetDefinition()->GetPDGMass() < |
---|
| 859 | G4Lambda::Lambda()->GetPDGMass()) |
---|
| 860 | numberofFinalStateNucleons++; |
---|
[819] | 861 | |
---|
[962] | 862 | numberofFinalStateNucleons = std::max(1, numberofFinalStateNucleons); |
---|
[819] | 863 | |
---|
[962] | 864 | G4int PinNucleus = std::max(0, |
---|
| 865 | G4int(targetNucleus.GetZ()) - protonsInFinalState); |
---|
| 866 | G4int NinNucleus = std::max(0, |
---|
| 867 | G4int(targetNucleus.GetN()-targetNucleus.GetZ()) - neutronsInFinalState); |
---|
[819] | 868 | |
---|
[962] | 869 | pseudoParticle[3].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
| 870 | pseudoParticle[3].SetMass( mOriginal*GeV ); |
---|
| 871 | pseudoParticle[3].SetTotalEnergy( |
---|
| 872 | std::sqrt( pOriginal*pOriginal + mOriginal*mOriginal )*GeV ); |
---|
[819] | 873 | |
---|
[962] | 874 | G4ParticleDefinition * aOrgDef = modifiedOriginal.GetDefinition(); |
---|
| 875 | G4int diff = 0; |
---|
| 876 | if(aOrgDef == G4Proton::Proton() || aOrgDef == G4Neutron::Neutron() ) diff = 1; |
---|
| 877 | if(numberofFinalStateNucleons == 1) diff = 0; |
---|
| 878 | pseudoParticle[4].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 879 | pseudoParticle[4].SetMass( protonMass*(numberofFinalStateNucleons-diff) ); |
---|
| 880 | pseudoParticle[4].SetTotalEnergy( protonMass*(numberofFinalStateNucleons-diff) ); |
---|
[819] | 881 | |
---|
[962] | 882 | G4double theoreticalKinetic = |
---|
| 883 | pseudoParticle[3].GetTotalEnergy() + pseudoParticle[4].GetTotalEnergy() - |
---|
| 884 | currentParticle.GetMass() - targetParticle.GetMass(); |
---|
| 885 | for (i = 0; i < vecLen; ++i) theoreticalKinetic -= vec[i]->GetMass(); |
---|
[819] | 886 | |
---|
[962] | 887 | G4double simulatedKinetic = |
---|
| 888 | currentParticle.GetKineticEnergy() + targetParticle.GetKineticEnergy(); |
---|
| 889 | for (i = 0; i < vecLen; ++i) |
---|
| 890 | simulatedKinetic += vec[i]->GetKineticEnergy(); |
---|
[819] | 891 | |
---|
[962] | 892 | pseudoParticle[5] = pseudoParticle[3] + pseudoParticle[4]; |
---|
| 893 | pseudoParticle[3].Lorentz( pseudoParticle[3], pseudoParticle[5] ); |
---|
| 894 | pseudoParticle[4].Lorentz( pseudoParticle[4], pseudoParticle[5] ); |
---|
[819] | 895 | |
---|
[962] | 896 | pseudoParticle[7].SetZero(); |
---|
| 897 | pseudoParticle[7] = pseudoParticle[7] + currentParticle; |
---|
| 898 | pseudoParticle[7] = pseudoParticle[7] + targetParticle; |
---|
| 899 | for (i = 0; i < vecLen; ++i) |
---|
| 900 | pseudoParticle[7] = pseudoParticle[7] + *vec[i]; |
---|
[819] | 901 | |
---|
[962] | 902 | /* |
---|
| 903 | // This code does not appear to do anything to the energy or angle spectra |
---|
[819] | 904 | if( vecLen <= 16 && vecLen > 0 ) |
---|
| 905 | { |
---|
| 906 | // must create a new set of ReactionProducts here because GenerateNBody will |
---|
| 907 | // modify the momenta for the particles, and we don't want to do this |
---|
| 908 | // |
---|
| 909 | G4ReactionProduct tempR[130]; |
---|
| 910 | tempR[0] = currentParticle; |
---|
| 911 | tempR[1] = targetParticle; |
---|
| 912 | for( i=0; i<vecLen; ++i )tempR[i+2] = *vec[i]; |
---|
[962] | 913 | G4FastVector<G4ReactionProduct,256> tempV1; |
---|
| 914 | tempV1.Initialize( vecLen+2 ); |
---|
| 915 | G4int tempLen1 = 0; |
---|
| 916 | for( i=0; i<vecLen+2; ++i )tempV1.SetElement( tempLen1++, &tempR[i] ); |
---|
[819] | 917 | constantCrossSection = true; |
---|
| 918 | |
---|
[962] | 919 | wgt = GenerateNBodyEvent(pseudoParticle[3].GetTotalEnergy() + |
---|
| 920 | pseudoParticle[4].GetTotalEnergy(), |
---|
| 921 | constantCrossSection, tempV1, tempLen1); |
---|
[819] | 922 | if (wgt == -1) { |
---|
| 923 | G4double Qvalue = 0; |
---|
[962] | 924 | for (i = 0; i < tempLen1; i++) Qvalue += tempV1[i]->GetMass(); |
---|
| 925 | wgt = GenerateNBodyEvent(Qvalue, |
---|
| 926 | constantCrossSection, tempV1, tempLen1); |
---|
[819] | 927 | } |
---|
| 928 | if(wgt>-.5) |
---|
| 929 | { |
---|
| 930 | theoreticalKinetic = 0.0; |
---|
[962] | 931 | for( i=0; i<tempLen1; ++i ) |
---|
[819] | 932 | { |
---|
[962] | 933 | pseudoParticle[6].Lorentz( *tempV1[i], pseudoParticle[4] ); |
---|
| 934 | theoreticalKinetic += pseudoParticle[6].GetKineticEnergy(); |
---|
[819] | 935 | } |
---|
| 936 | } |
---|
| 937 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 938 | } |
---|
[962] | 939 | */ |
---|
| 940 | |
---|
| 941 | // |
---|
| 942 | // Make sure that the kinetic energies are correct |
---|
| 943 | // |
---|
| 944 | |
---|
| 945 | if (simulatedKinetic != 0.0) { |
---|
| 946 | wgt = theoreticalKinetic/simulatedKinetic; |
---|
| 947 | theoreticalKinetic = currentParticle.GetKineticEnergy() * wgt; |
---|
| 948 | simulatedKinetic = theoreticalKinetic; |
---|
| 949 | currentParticle.SetKineticEnergy(theoreticalKinetic); |
---|
| 950 | pp = currentParticle.GetTotalMomentum(); |
---|
| 951 | pp1 = currentParticle.GetMomentum().mag(); |
---|
| 952 | if (pp1 < 1.0e-6*GeV) { |
---|
| 953 | G4ThreeVector iso = Isotropic(pp); |
---|
| 954 | currentParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 955 | } else { |
---|
| 956 | currentParticle.SetMomentum(currentParticle.GetMomentum() * (pp/pp1)); |
---|
| 957 | } |
---|
| 958 | |
---|
| 959 | theoreticalKinetic = targetParticle.GetKineticEnergy() * wgt; |
---|
| 960 | targetParticle.SetKineticEnergy(theoreticalKinetic); |
---|
| 961 | simulatedKinetic += theoreticalKinetic; |
---|
| 962 | pp = targetParticle.GetTotalMomentum(); |
---|
| 963 | pp1 = targetParticle.GetMomentum().mag(); |
---|
| 964 | |
---|
| 965 | if (pp1 < 1.0e-6*GeV) { |
---|
| 966 | G4ThreeVector iso = Isotropic(pp); |
---|
| 967 | targetParticle.SetMomentum(iso.x(), iso.y(), iso.z() ); |
---|
| 968 | } else { |
---|
| 969 | targetParticle.SetMomentum(targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 970 | } |
---|
| 971 | |
---|
| 972 | for (i = 0; i < vecLen; ++i ) { |
---|
| 973 | theoreticalKinetic = vec[i]->GetKineticEnergy() * wgt; |
---|
[819] | 974 | simulatedKinetic += theoreticalKinetic; |
---|
[962] | 975 | vec[i]->SetKineticEnergy(theoreticalKinetic); |
---|
| 976 | pp = vec[i]->GetTotalMomentum(); |
---|
| 977 | pp1 = vec[i]->GetMomentum().mag(); |
---|
[819] | 978 | if( pp1 < 1.0e-6*GeV ) { |
---|
| 979 | G4ThreeVector iso = Isotropic(pp); |
---|
[962] | 980 | vec[i]->SetMomentum(iso.x(), iso.y(), iso.z() ); |
---|
[819] | 981 | } else { |
---|
[962] | 982 | vec[i]->SetMomentum(vec[i]->GetMomentum() * (pp/pp1) ); |
---|
[819] | 983 | } |
---|
[962] | 984 | } |
---|
| 985 | } |
---|
[819] | 986 | |
---|
[962] | 987 | // Rotate(numberofFinalStateNucleons, pseudoParticle[3].GetMomentum(), |
---|
| 988 | // modifiedOriginal, originalIncident, targetNucleus, |
---|
| 989 | // currentParticle, targetParticle, vec, vecLen ); |
---|
| 990 | |
---|
| 991 | // Add black track particles |
---|
| 992 | // the total number of particles produced is restricted to 198 |
---|
| 993 | // this may have influence on very high energies |
---|
| 994 | |
---|
| 995 | if( atomicWeight >= 1.5 ) |
---|
| 996 | { |
---|
| 997 | // npnb is number of proton/neutron black track particles |
---|
| 998 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
| 999 | // epnb is the kinetic energy available for proton/neutron black track |
---|
| 1000 | // particles |
---|
| 1001 | // edta is the kinetic energy available for deuteron/triton/alpha particles |
---|
| 1002 | |
---|
| 1003 | G4int npnb = 0; |
---|
| 1004 | G4int ndta = 0; |
---|
| 1005 | |
---|
| 1006 | G4double epnb, edta; |
---|
| 1007 | if (veryForward) { |
---|
| 1008 | epnb = targetNucleus.GetAnnihilationPNBlackTrackEnergy(); |
---|
| 1009 | edta = targetNucleus.GetAnnihilationDTABlackTrackEnergy(); |
---|
| 1010 | } else { |
---|
| 1011 | epnb = targetNucleus.GetPNBlackTrackEnergy(); |
---|
| 1012 | edta = targetNucleus.GetDTABlackTrackEnergy(); |
---|
[819] | 1013 | } |
---|
[962] | 1014 | /* |
---|
| 1015 | G4ReactionProduct* fudge = new G4ReactionProduct(); |
---|
| 1016 | fudge->SetDefinition( aProton ); |
---|
| 1017 | G4double TT = epnb + edta; |
---|
| 1018 | G4double MM = fudge->GetMass()/GeV; |
---|
| 1019 | fudge->SetTotalEnergy(MM*GeV + TT*GeV); |
---|
| 1020 | G4double pzz = std::sqrt(TT*(TT + 2.*MM)); |
---|
| 1021 | fudge->SetMomentum(0.0, 0.0, pzz*GeV); |
---|
| 1022 | vec.SetElement(vecLen++, fudge); |
---|
| 1023 | // G4cout << " Fudge = " << vec[vecLen-1]->GetKineticEnergy()/GeV |
---|
| 1024 | << G4endl; |
---|
| 1025 | */ |
---|
[819] | 1026 | |
---|
[962] | 1027 | const G4double pnCutOff = 0.001; |
---|
| 1028 | const G4double dtaCutOff = 0.001; |
---|
| 1029 | // const G4double kineticMinimum = 1.e-6; |
---|
| 1030 | // const G4double kineticFactor = -0.010; |
---|
| 1031 | // G4double sprob = 0.0; // sprob = probability of self-absorption in |
---|
| 1032 | // heavy molecules |
---|
| 1033 | // Not currently used (DHW 9 June 2008) const G4double ekIncident = originalIncident->GetKineticEnergy()/GeV; |
---|
| 1034 | // if (ekIncident >= 5.0) sprob = std::min(1.0, 0.6*std::log(ekIncident-4.0)); |
---|
| 1035 | if (epnb > pnCutOff) |
---|
[819] | 1036 | { |
---|
[962] | 1037 | npnb = G4Poisson((1.5+1.25*numberofFinalStateNucleons)*epnb/(epnb+edta)); |
---|
| 1038 | if (numberofFinalStateNucleons + npnb > atomicWeight) |
---|
| 1039 | npnb = G4int(atomicWeight+0.00001 - numberofFinalStateNucleons); |
---|
| 1040 | npnb = std::min( npnb, 127-vecLen ); |
---|
| 1041 | } |
---|
| 1042 | if( edta >= dtaCutOff ) |
---|
| 1043 | { |
---|
| 1044 | ndta = G4Poisson((1.5+1.25*numberofFinalStateNucleons)*edta/(epnb+edta)); |
---|
| 1045 | ndta = std::min( ndta, 127-vecLen ); |
---|
| 1046 | } |
---|
| 1047 | if (npnb == 0 && ndta == 0) npnb = 1; |
---|
[819] | 1048 | |
---|
[962] | 1049 | AddBlackTrackParticles(epnb, npnb, edta, ndta, modifiedOriginal, |
---|
| 1050 | PinNucleus, NinNucleus, targetNucleus, |
---|
| 1051 | vec, vecLen); |
---|
| 1052 | } |
---|
[819] | 1053 | |
---|
| 1054 | // if( centerofmassEnergy <= (4.0+G4UniformRand()) ) |
---|
| 1055 | // MomentumCheck( modifiedOriginal, currentParticle, targetParticle, |
---|
| 1056 | // vec, vecLen ); |
---|
| 1057 | // |
---|
| 1058 | // calculate time delay for nuclear reactions |
---|
| 1059 | // |
---|
[962] | 1060 | |
---|
[819] | 1061 | if( (atomicWeight >= 1.5) && (atomicWeight <= 230.0) && (ekOriginal <= 0.2) ) |
---|
| 1062 | currentParticle.SetTOF( |
---|
| 1063 | 1.0-500.0*std::exp(-ekOriginal/0.04)*std::log(G4UniformRand()) ); |
---|
| 1064 | else |
---|
| 1065 | currentParticle.SetTOF( 1.0 ); |
---|
| 1066 | return true; |
---|
| 1067 | |
---|
| 1068 | } |
---|
[962] | 1069 | |
---|
| 1070 | |
---|
| 1071 | void G4RPGFragmentation:: |
---|
| 1072 | ReduceEnergiesOfSecondaries(G4int startingIndex, |
---|
| 1073 | G4double& forwardKinetic, |
---|
| 1074 | G4double& backwardKinetic, |
---|
| 1075 | G4FastVector<G4ReactionProduct,256>& vec, |
---|
| 1076 | G4int& vecLen, |
---|
| 1077 | G4ReactionProduct& forwardPseudoParticle, |
---|
| 1078 | G4ReactionProduct& backwardPseudoParticle, |
---|
| 1079 | G4double& pt) |
---|
| 1080 | { |
---|
| 1081 | // Reduce energies and pt of secondaries in order to maintain |
---|
| 1082 | // energy conservation |
---|
| 1083 | |
---|
| 1084 | G4double totalEnergy; |
---|
| 1085 | G4double pp; |
---|
| 1086 | G4double pp1; |
---|
| 1087 | G4double px; |
---|
| 1088 | G4double py; |
---|
| 1089 | G4double mass; |
---|
| 1090 | G4ReactionProduct* pVec; |
---|
| 1091 | G4int i; |
---|
| 1092 | |
---|
| 1093 | forwardKinetic = 0.0; |
---|
| 1094 | backwardKinetic = 0.0; |
---|
| 1095 | forwardPseudoParticle.SetZero(); |
---|
| 1096 | backwardPseudoParticle.SetZero(); |
---|
| 1097 | |
---|
| 1098 | for (i = startingIndex; i < vecLen; i++) { |
---|
| 1099 | pVec = vec[i]; |
---|
| 1100 | if (pVec->GetSide() != -3) { |
---|
| 1101 | mass = pVec->GetMass(); |
---|
| 1102 | totalEnergy = 0.95*pVec->GetTotalEnergy() + 0.05*mass; |
---|
| 1103 | pVec->SetTotalEnergy(totalEnergy); |
---|
| 1104 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - mass*mass ) ); |
---|
| 1105 | pp1 = pVec->GetMomentum().mag(); |
---|
| 1106 | if (pp1 < 1.0e-6*GeV) { |
---|
| 1107 | G4ThreeVector iso = Isotropic(pp); |
---|
| 1108 | pVec->SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 1109 | } else { |
---|
| 1110 | pVec->SetMomentum(pVec->GetMomentum() * (pp/pp1) ); |
---|
| 1111 | } |
---|
| 1112 | |
---|
| 1113 | px = pVec->GetMomentum().x(); |
---|
| 1114 | py = pVec->GetMomentum().y(); |
---|
| 1115 | pt = std::max(1.0, std::sqrt( px*px + py*py ) )/GeV; |
---|
| 1116 | if (pVec->GetSide() > 0) { |
---|
| 1117 | forwardKinetic += pVec->GetKineticEnergy()/GeV; |
---|
| 1118 | forwardPseudoParticle = forwardPseudoParticle + (*pVec); |
---|
| 1119 | } else { |
---|
| 1120 | backwardKinetic += pVec->GetKineticEnergy()/GeV; |
---|
| 1121 | backwardPseudoParticle = backwardPseudoParticle + (*pVec); |
---|
| 1122 | } |
---|
| 1123 | } |
---|
| 1124 | } |
---|
| 1125 | } |
---|
| 1126 | |
---|
[819] | 1127 | /* end of file */ |
---|