[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: G4RPGStrangeProduction.cc,v 1.1 2007/07/18 21:04:21 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 "G4RPGStrangeProduction.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 <iostream> |
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| 35 | #include "G4HadReentrentException.hh" |
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| 36 | #include <signal.h> |
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| 37 | |
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| 38 | |
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| 39 | G4RPGStrangeProduction::G4RPGStrangeProduction() |
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| 40 | : G4RPGReaction() {} |
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| 41 | |
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| 42 | |
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| 43 | G4bool G4RPGStrangeProduction:: |
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| 44 | ReactionStage(const G4HadProjectile* /*originalIncident*/, |
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| 45 | G4ReactionProduct& modifiedOriginal, |
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| 46 | G4bool& incidentHasChanged, |
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| 47 | const G4DynamicParticle* originalTarget, |
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| 48 | G4ReactionProduct& targetParticle, |
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| 49 | G4bool& targetHasChanged, |
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| 50 | const G4Nucleus& /*targetNucleus*/, |
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| 51 | G4ReactionProduct& currentParticle, |
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| 52 | G4FastVector<G4ReactionProduct,256>& vec, |
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| 53 | G4int& vecLen, |
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| 54 | G4bool /*leadFlag*/, |
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| 55 | G4ReactionProduct& /*leadingStrangeParticle*/) |
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| 56 | { |
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| 57 | // Derived from H. Fesefeldt's original FORTRAN code STPAIR |
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| 58 | // |
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| 59 | // Choose charge combinations K+ K-, K+ K0B, K0 K0B, K0 K-, |
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| 60 | // K+ Y0, K0 Y+, K0 Y- |
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| 61 | // For antibaryon induced reactions half of the cross sections KB YB |
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| 62 | // pairs are produced. Charge is not conserved, no experimental data available |
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| 63 | // for exclusive reactions, therefore some average behaviour assumed. |
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| 64 | // The ratio L/SIGMA is taken as 3:1 (from experimental low energy) |
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| 65 | // |
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| 66 | |
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| 67 | if( vecLen == 0 )return true; |
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| 68 | // |
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| 69 | // the following protects against annihilation processes |
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| 70 | // |
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| 71 | if( currentParticle.GetMass() == 0.0 || targetParticle.GetMass() == 0.0 )return true; |
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| 72 | |
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| 73 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
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| 74 | const G4double mOriginal = modifiedOriginal.GetDefinition()->GetPDGMass()/GeV; |
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| 75 | G4double targetMass = originalTarget->GetDefinition()->GetPDGMass()/GeV; |
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| 76 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
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| 77 | targetMass*targetMass + |
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| 78 | 2.0*targetMass*etOriginal ); // GeV |
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| 79 | G4double currentMass = currentParticle.GetMass()/GeV; |
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| 80 | G4double availableEnergy = centerofmassEnergy-(targetMass+currentMass); |
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| 81 | if( availableEnergy <= 1.0 )return true; |
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| 82 | |
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| 83 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
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| 84 | G4ParticleDefinition *anAntiProton = G4AntiProton::AntiProton(); |
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| 85 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
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| 86 | G4ParticleDefinition *anAntiNeutron = G4AntiNeutron::AntiNeutron(); |
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| 87 | G4ParticleDefinition *aSigmaMinus = G4SigmaMinus::SigmaMinus(); |
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| 88 | G4ParticleDefinition *aSigmaPlus = G4SigmaPlus::SigmaPlus(); |
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| 89 | G4ParticleDefinition *aSigmaZero = G4SigmaZero::SigmaZero(); |
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| 90 | G4ParticleDefinition *anAntiSigmaMinus = G4AntiSigmaMinus::AntiSigmaMinus(); |
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| 91 | G4ParticleDefinition *anAntiSigmaPlus = G4AntiSigmaPlus::AntiSigmaPlus(); |
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| 92 | G4ParticleDefinition *anAntiSigmaZero = G4AntiSigmaZero::AntiSigmaZero(); |
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| 93 | G4ParticleDefinition *aKaonMinus = G4KaonMinus::KaonMinus(); |
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| 94 | G4ParticleDefinition *aKaonPlus = G4KaonPlus::KaonPlus(); |
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| 95 | G4ParticleDefinition *aKaonZL = G4KaonZeroLong::KaonZeroLong(); |
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| 96 | G4ParticleDefinition *aKaonZS = G4KaonZeroShort::KaonZeroShort(); |
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| 97 | G4ParticleDefinition *aLambda = G4Lambda::Lambda(); |
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| 98 | G4ParticleDefinition *anAntiLambda = G4AntiLambda::AntiLambda(); |
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| 99 | |
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| 100 | const G4double protonMass = aProton->GetPDGMass()/GeV; |
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| 101 | const G4double sigmaMinusMass = aSigmaMinus->GetPDGMass()/GeV; |
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| 102 | // |
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| 103 | // determine the center of mass energy bin |
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| 104 | // |
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| 105 | const G4double avrs[] = {3.,4.,5.,6.,7.,8.,9.,10.,20.,30.,40.,50.}; |
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| 106 | |
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| 107 | G4int ibin, i3, i4; |
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| 108 | G4double avk, avy, avn, ran; |
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| 109 | G4int i = 1; |
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| 110 | while( (i<12) && (centerofmassEnergy>avrs[i]) )++i; |
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| 111 | if( i == 12 ) |
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| 112 | ibin = 11; |
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| 113 | else |
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| 114 | ibin = i; |
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| 115 | // |
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| 116 | // the fortran code chooses a random replacement of produced kaons |
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| 117 | // but does not take into account charge conservation |
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| 118 | // |
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| 119 | if( vecLen == 1 ) // we know that vecLen > 0 |
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| 120 | { |
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| 121 | i3 = 0; |
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| 122 | i4 = 1; // note that we will be adding a new secondary particle in this case only |
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| 123 | } |
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| 124 | else // otherwise 0 <= i3,i4 < vecLen |
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| 125 | { |
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| 126 | G4double ran = G4UniformRand(); |
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| 127 | while( ran == 1.0 )ran = G4UniformRand(); |
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| 128 | i4 = i3 = G4int( vecLen*ran ); |
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| 129 | while( i3 == i4 ) |
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| 130 | { |
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| 131 | ran = G4UniformRand(); |
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| 132 | while( ran == 1.0 )ran = G4UniformRand(); |
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| 133 | i4 = G4int( vecLen*ran ); |
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| 134 | } |
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| 135 | } |
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| 136 | |
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| 137 | // |
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| 138 | // use linear interpolation or extrapolation by y=centerofmassEnergy*x+b |
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| 139 | // |
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| 140 | const G4double avkkb[] = { 0.0015, 0.005, 0.012, 0.0285, 0.0525, 0.075, |
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| 141 | 0.0975, 0.123, 0.28, 0.398, 0.495, 0.573 }; |
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| 142 | const G4double avky[] = { 0.005, 0.03, 0.064, 0.095, 0.115, 0.13, |
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| 143 | 0.145, 0.155, 0.20, 0.205, 0.210, 0.212 }; |
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| 144 | const G4double avnnb[] = { 0.00001, 0.0001, 0.0006, 0.0025, 0.01, 0.02, |
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| 145 | 0.04, 0.05, 0.12, 0.15, 0.18, 0.20 }; |
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| 146 | |
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| 147 | avk = (std::log(avkkb[ibin])-std::log(avkkb[ibin-1]))*(centerofmassEnergy-avrs[ibin-1]) |
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| 148 | /(avrs[ibin]-avrs[ibin-1]) + std::log(avkkb[ibin-1]); |
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| 149 | avk = std::exp(avk); |
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| 150 | |
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| 151 | avy = (std::log(avky[ibin])-std::log(avky[ibin-1]))*(centerofmassEnergy-avrs[ibin-1]) |
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| 152 | /(avrs[ibin]-avrs[ibin-1]) + std::log(avky[ibin-1]); |
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| 153 | avy = std::exp(avy); |
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| 154 | |
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| 155 | avn = (std::log(avnnb[ibin])-std::log(avnnb[ibin-1]))*(centerofmassEnergy-avrs[ibin-1]) |
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| 156 | /(avrs[ibin]-avrs[ibin-1]) + std::log(avnnb[ibin-1]); |
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| 157 | avn = std::exp(avn); |
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| 158 | |
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| 159 | if( avk+avy+avn <= 0.0 )return true; |
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| 160 | |
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| 161 | if( currentMass < protonMass )avy /= 2.0; |
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| 162 | if( targetMass < protonMass )avy = 0.0; |
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| 163 | avy += avk+avn; |
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| 164 | avk += avn; |
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| 165 | ran = G4UniformRand(); |
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| 166 | if( ran < avn ) |
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| 167 | { |
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| 168 | if( availableEnergy < 2.0 )return true; |
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| 169 | if( vecLen == 1 ) // add a new secondary |
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| 170 | { |
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| 171 | G4ReactionProduct *p1 = new G4ReactionProduct; |
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| 172 | if( G4UniformRand() < 0.5 ) |
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| 173 | { |
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| 174 | vec[0]->SetDefinition( aNeutron ); |
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| 175 | p1->SetDefinition( anAntiNeutron ); |
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| 176 | (G4UniformRand() < 0.5) ? p1->SetSide( -1 ) : p1->SetSide( 1 ); |
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| 177 | vec[0]->SetMayBeKilled(false); |
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| 178 | p1->SetMayBeKilled(false); |
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| 179 | } |
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| 180 | else |
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| 181 | { |
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| 182 | vec[0]->SetDefinition( aProton ); |
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| 183 | p1->SetDefinition( anAntiProton ); |
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| 184 | (G4UniformRand() < 0.5) ? p1->SetSide( -1 ) : p1->SetSide( 1 ); |
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| 185 | vec[0]->SetMayBeKilled(false); |
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| 186 | p1->SetMayBeKilled(false); |
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| 187 | } |
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| 188 | vec.SetElement( vecLen++, p1 ); |
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| 189 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 190 | } |
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| 191 | else |
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| 192 | { // replace two secondaries |
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| 193 | if( G4UniformRand() < 0.5 ) |
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| 194 | { |
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| 195 | vec[i3]->SetDefinition( aNeutron ); |
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| 196 | vec[i4]->SetDefinition( anAntiNeutron ); |
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| 197 | vec[i3]->SetMayBeKilled(false); |
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| 198 | vec[i4]->SetMayBeKilled(false); |
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| 199 | } |
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| 200 | else |
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| 201 | { |
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| 202 | vec[i3]->SetDefinition( aProton ); |
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| 203 | vec[i4]->SetDefinition( anAntiProton ); |
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| 204 | vec[i3]->SetMayBeKilled(false); |
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| 205 | vec[i4]->SetMayBeKilled(false); |
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| 206 | } |
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| 207 | } |
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| 208 | } |
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| 209 | else if( ran < avk ) |
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| 210 | { |
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| 211 | if( availableEnergy < 1.0 )return true; |
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| 212 | |
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| 213 | const G4double kkb[] = { 0.2500, 0.3750, 0.5000, 0.5625, 0.6250, |
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| 214 | 0.6875, 0.7500, 0.8750, 1.000 }; |
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| 215 | const G4int ipakkb1[] = { 10, 10, 10, 11, 11, 12, 12, 11, 12 }; |
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| 216 | const G4int ipakkb2[] = { 13, 11, 12, 11, 12, 11, 12, 13, 13 }; |
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| 217 | ran = G4UniformRand(); |
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| 218 | i = 0; |
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| 219 | while( (i<9) && (ran>=kkb[i]) )++i; |
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| 220 | if( i == 9 )return true; |
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| 221 | // |
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| 222 | // ipakkb[] = { 10,13, 10,11, 10,12, 11,11, 11,12, 12,11, 12,12, 11,13, 12,13 }; |
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| 223 | // charge + - + 0 + 0 0 0 0 0 0 0 0 0 0 - 0 - |
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| 224 | // |
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| 225 | switch( ipakkb1[i] ) |
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| 226 | { |
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| 227 | case 10: |
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| 228 | vec[i3]->SetDefinition( aKaonPlus ); |
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| 229 | vec[i3]->SetMayBeKilled(false); |
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| 230 | break; |
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| 231 | case 11: |
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| 232 | vec[i3]->SetDefinition( aKaonZS ); |
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| 233 | vec[i3]->SetMayBeKilled(false); |
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| 234 | break; |
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| 235 | case 12: |
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| 236 | vec[i3]->SetDefinition( aKaonZL ); |
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| 237 | vec[i3]->SetMayBeKilled(false); |
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| 238 | break; |
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| 239 | } |
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| 240 | |
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| 241 | if( vecLen == 1 ) // add a secondary |
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| 242 | { |
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| 243 | G4ReactionProduct *p1 = new G4ReactionProduct; |
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| 244 | switch( ipakkb2[i] ) |
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| 245 | { |
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| 246 | case 11: |
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| 247 | p1->SetDefinition( aKaonZS ); |
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| 248 | p1->SetMayBeKilled(false); |
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| 249 | break; |
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| 250 | case 12: |
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| 251 | p1->SetDefinition( aKaonZL ); |
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| 252 | p1->SetMayBeKilled(false); |
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| 253 | break; |
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| 254 | case 13: |
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| 255 | p1->SetDefinition( aKaonMinus ); |
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| 256 | p1->SetMayBeKilled(false); |
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| 257 | break; |
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| 258 | } |
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| 259 | (G4UniformRand() < 0.5) ? p1->SetSide( -1 ) : p1->SetSide( 1 ); |
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| 260 | vec.SetElement( vecLen++, p1 ); |
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| 261 | |
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| 262 | } |
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| 263 | else // replace |
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| 264 | { |
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| 265 | switch( ipakkb2[i] ) |
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| 266 | { |
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| 267 | case 11: |
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| 268 | vec[i4]->SetDefinition( aKaonZS ); |
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| 269 | vec[i4]->SetMayBeKilled(false); |
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| 270 | break; |
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| 271 | case 12: |
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| 272 | vec[i4]->SetDefinition( aKaonZL ); |
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| 273 | vec[i4]->SetMayBeKilled(false); |
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| 274 | break; |
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| 275 | case 13: |
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| 276 | vec[i4]->SetDefinition( aKaonMinus ); |
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| 277 | vec[i4]->SetMayBeKilled(false); |
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| 278 | break; |
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| 279 | } |
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| 280 | } |
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| 281 | } |
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| 282 | else if( ran < avy ) |
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| 283 | { |
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| 284 | if( availableEnergy < 1.6 )return true; |
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| 285 | |
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| 286 | const G4double ky[] = { 0.200, 0.300, 0.400, 0.550, 0.625, 0.700, |
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| 287 | 0.800, 0.850, 0.900, 0.950, 0.975, 1.000 }; |
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| 288 | const G4int ipaky1[] = { 18, 18, 18, 20, 20, 20, 21, 21, 21, 22, 22, 22 }; |
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| 289 | const G4int ipaky2[] = { 10, 11, 12, 10, 11, 12, 10, 11, 12, 10, 11, 12 }; |
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| 290 | const G4int ipakyb1[] = { 19, 19, 19, 23, 23, 23, 24, 24, 24, 25, 25, 25 }; |
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| 291 | const G4int ipakyb2[] = { 13, 12, 11, 13, 12, 11, 13, 12, 11, 13, 12, 11 }; |
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| 292 | ran = G4UniformRand(); |
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| 293 | i = 0; |
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| 294 | while( (i<12) && (ran>ky[i]) )++i; |
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| 295 | if( i == 12 )return true; |
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| 296 | if( (currentMass<protonMass) || (G4UniformRand()<0.5) ) |
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| 297 | { |
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| 298 | // ipaky[] = { 18,10, 18,11, 18,12, 20,10, 20,11, 20,12, |
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| 299 | // 0 + 0 0 0 0 + + + 0 + 0 |
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| 300 | // |
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| 301 | // 21,10, 21,11, 21,12, 22,10, 22,11, 22,12 } |
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| 302 | // 0 + 0 0 0 0 - + - 0 - 0 |
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| 303 | switch( ipaky1[i] ) |
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| 304 | { |
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| 305 | case 18: |
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| 306 | targetParticle.SetDefinition( aLambda ); |
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| 307 | break; |
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| 308 | case 20: |
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| 309 | targetParticle.SetDefinition( aSigmaPlus ); |
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| 310 | break; |
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| 311 | case 21: |
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| 312 | targetParticle.SetDefinition( aSigmaZero ); |
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| 313 | break; |
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| 314 | case 22: |
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| 315 | targetParticle.SetDefinition( aSigmaMinus ); |
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| 316 | break; |
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| 317 | } |
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| 318 | targetHasChanged = true; |
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| 319 | switch( ipaky2[i] ) |
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| 320 | { |
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| 321 | case 10: |
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| 322 | vec[i3]->SetDefinition( aKaonPlus ); |
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| 323 | vec[i3]->SetMayBeKilled(false); |
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| 324 | break; |
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| 325 | case 11: |
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| 326 | vec[i3]->SetDefinition( aKaonZS ); |
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| 327 | vec[i3]->SetMayBeKilled(false); |
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| 328 | break; |
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| 329 | case 12: |
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| 330 | vec[i3]->SetDefinition( aKaonZL ); |
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| 331 | vec[i3]->SetMayBeKilled(false); |
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| 332 | break; |
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| 333 | } |
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| 334 | } |
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| 335 | else // (currentMass >= protonMass) && (G4UniformRand() >= 0.5) |
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| 336 | { |
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| 337 | // ipakyb[] = { 19,13, 19,12, 19,11, 23,13, 23,12, 23,11, |
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| 338 | // 24,13, 24,12, 24,11, 25,13, 25,12, 25,11 }; |
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| 339 | if( (currentParticle.GetDefinition() == anAntiProton) || |
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| 340 | (currentParticle.GetDefinition() == anAntiNeutron) || |
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| 341 | (currentParticle.GetDefinition() == anAntiLambda) || |
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| 342 | (currentMass > sigmaMinusMass) ) |
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| 343 | { |
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| 344 | switch( ipakyb1[i] ) |
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| 345 | { |
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| 346 | case 19: |
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| 347 | currentParticle.SetDefinitionAndUpdateE( anAntiLambda ); |
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| 348 | break; |
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| 349 | case 23: |
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| 350 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaPlus ); |
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| 351 | break; |
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| 352 | case 24: |
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| 353 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaZero ); |
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| 354 | break; |
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| 355 | case 25: |
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| 356 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaMinus ); |
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| 357 | break; |
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| 358 | } |
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| 359 | incidentHasChanged = true; |
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| 360 | switch( ipakyb2[i] ) |
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| 361 | { |
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| 362 | case 11: |
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| 363 | vec[i3]->SetDefinition( aKaonZS ); |
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| 364 | vec[i3]->SetMayBeKilled(false); |
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| 365 | break; |
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| 366 | case 12: |
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| 367 | vec[i3]->SetDefinition( aKaonZL ); |
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| 368 | vec[i3]->SetMayBeKilled(false); |
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| 369 | break; |
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| 370 | case 13: |
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| 371 | vec[i3]->SetDefinition( aKaonMinus ); |
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| 372 | vec[i3]->SetMayBeKilled(false); |
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| 373 | break; |
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| 374 | } |
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| 375 | } |
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| 376 | else |
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| 377 | { |
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| 378 | switch( ipaky1[i] ) |
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| 379 | { |
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| 380 | case 18: |
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| 381 | currentParticle.SetDefinitionAndUpdateE( aLambda ); |
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| 382 | break; |
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| 383 | case 20: |
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| 384 | currentParticle.SetDefinitionAndUpdateE( aSigmaPlus ); |
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| 385 | break; |
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| 386 | case 21: |
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| 387 | currentParticle.SetDefinitionAndUpdateE( aSigmaZero ); |
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| 388 | break; |
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| 389 | case 22: |
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| 390 | currentParticle.SetDefinitionAndUpdateE( aSigmaMinus ); |
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| 391 | break; |
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| 392 | } |
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| 393 | incidentHasChanged = true; |
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| 394 | switch( ipaky2[i] ) |
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| 395 | { |
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| 396 | case 10: |
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| 397 | vec[i3]->SetDefinition( aKaonPlus ); |
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| 398 | vec[i3]->SetMayBeKilled(false); |
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| 399 | break; |
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| 400 | case 11: |
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| 401 | vec[i3]->SetDefinition( aKaonZS ); |
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| 402 | vec[i3]->SetMayBeKilled(false); |
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| 403 | break; |
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| 404 | case 12: |
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| 405 | vec[i3]->SetDefinition( aKaonZL ); |
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| 406 | vec[i3]->SetMayBeKilled(false); |
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| 407 | break; |
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| 408 | } |
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| 409 | } |
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| 410 | } |
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| 411 | } |
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| 412 | else return true; |
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| 413 | |
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| 414 | // |
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| 415 | // check the available energy |
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| 416 | // if there is not enough energy for kkb/ky pair production |
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| 417 | // then reduce the number of secondary particles |
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| 418 | // NOTE: |
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| 419 | // the number of secondaries may have been changed |
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| 420 | // the incident and/or target particles may have changed |
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| 421 | // charge conservation is ignored (as well as strangness conservation) |
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| 422 | // |
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| 423 | currentMass = currentParticle.GetMass()/GeV; |
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| 424 | targetMass = targetParticle.GetMass()/GeV; |
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| 425 | |
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| 426 | G4double energyCheck = centerofmassEnergy-(currentMass+targetMass); |
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| 427 | for( i=0; i<vecLen; ++i ) |
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| 428 | { |
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| 429 | energyCheck -= vec[i]->GetMass()/GeV; |
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| 430 | if( energyCheck < 0.0 ) // chop off the secondary List |
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| 431 | { |
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| 432 | vecLen = std::max( 0, --i ); // looks like a memory leak @@@@@@@@@@@@ |
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| 433 | G4int j; |
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| 434 | for(j=i; j<vecLen; j++) delete vec[j]; |
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| 435 | break; |
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| 436 | } |
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| 437 | } |
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| 438 | |
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| 439 | return true; |
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| 440 | } |
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| 441 | |
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| 442 | |
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| 443 | /* end of file */ |
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