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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27 | // GEANT4 tag $Name: geant4-09-02 $ |
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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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