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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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: G4RPGPionSuppression.cc,v 1.1 2007/07/18 21:04:20 dennis Exp $ |
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27 | // GEANT4 tag $Name: $ |
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28 | // |
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29 | |
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30 | #include "G4RPGPionSuppression.hh" |
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31 | #include "Randomize.hh" |
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32 | #include <iostream> |
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33 | #include "G4HadReentrentException.hh" |
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34 | #include <signal.h> |
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35 | |
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36 | |
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37 | G4RPGPionSuppression::G4RPGPionSuppression() |
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38 | : G4RPGReaction() {} |
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39 | |
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40 | |
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41 | G4bool G4RPGPionSuppression:: |
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42 | ReactionStage(const G4HadProjectile* /*originalIncident*/, |
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43 | G4ReactionProduct& modifiedOriginal, |
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44 | G4bool& incidentHasChanged, |
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45 | const G4DynamicParticle* /*originalTarget*/, |
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46 | G4ReactionProduct& targetParticle, |
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47 | G4bool& targetHasChanged, |
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48 | const G4Nucleus& targetNucleus, |
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49 | G4ReactionProduct& currentParticle, |
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50 | G4FastVector<G4ReactionProduct,256>& vec, |
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51 | G4int& vecLen, |
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52 | G4bool /*leadFlag*/, |
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53 | G4ReactionProduct& /*leadingStrangeParticle*/) |
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54 | { |
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55 | // This code was originally in the fortran code TWOCLU |
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56 | // |
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57 | // Suppress charged pions, for various reasons |
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58 | // |
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59 | G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
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60 | G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
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61 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
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62 | G4double cmEnergy = std::sqrt( mOriginal*mOriginal + targetMass*targetMass + |
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63 | 2.0*targetMass*etOriginal ); |
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64 | G4double eAvailable = cmEnergy - mOriginal - targetMass; |
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65 | for (G4int i = 0; i < vecLen; i++) eAvailable -= vec[i]->GetMass()/GeV; |
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66 | |
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67 | const G4double atomicWeight = targetNucleus.GetN(); |
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68 | const G4double atomicNumber = targetNucleus.GetZ(); |
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69 | const G4double pOriginal = modifiedOriginal.GetTotalMomentum()/GeV; |
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70 | |
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71 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
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72 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
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73 | G4ParticleDefinition* aPiZero = G4PionZero::PionZero(); |
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74 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
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75 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
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76 | G4double piMass = aPiPlus->GetPDGMass()/GeV; |
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77 | G4double nucleonMass = aNeutron->GetPDGMass()/GeV; |
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78 | |
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79 | const G4bool antiTest = |
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80 | modifiedOriginal.GetDefinition() != G4AntiProton::AntiProton() && |
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81 | modifiedOriginal.GetDefinition() != G4AntiNeutron::AntiNeutron() && |
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82 | modifiedOriginal.GetDefinition() != G4AntiLambda::AntiLambda() && |
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83 | modifiedOriginal.GetDefinition() != G4AntiSigmaPlus::AntiSigmaPlus() && |
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84 | modifiedOriginal.GetDefinition() != G4AntiSigmaMinus::AntiSigmaMinus() && |
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85 | modifiedOriginal.GetDefinition() != G4AntiXiZero::AntiXiZero() && |
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86 | modifiedOriginal.GetDefinition() != G4AntiXiMinus::AntiXiMinus() && |
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87 | modifiedOriginal.GetDefinition() != G4AntiOmegaMinus::AntiOmegaMinus(); |
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88 | |
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89 | if( antiTest && ( |
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90 | currentParticle.GetDefinition() == aPiPlus || |
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91 | currentParticle.GetDefinition() == aPiZero || |
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92 | currentParticle.GetDefinition() == aPiMinus ) && |
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93 | ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) && |
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94 | ( G4UniformRand() <= atomicWeight/300.0 ) ) |
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95 | { |
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96 | if (eAvailable > nucleonMass - piMass) { |
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97 | if( G4UniformRand() > atomicNumber/atomicWeight ) |
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98 | currentParticle.SetDefinitionAndUpdateE( aNeutron ); |
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99 | else |
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100 | currentParticle.SetDefinitionAndUpdateE( aProton ); |
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101 | incidentHasChanged = true; |
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102 | } |
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103 | } |
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104 | |
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105 | if( antiTest && ( |
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106 | targetParticle.GetDefinition() == aPiPlus || |
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107 | targetParticle.GetDefinition() == aPiZero || |
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108 | targetParticle.GetDefinition() == aPiMinus ) && |
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109 | ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) && |
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110 | ( G4UniformRand() <= atomicWeight/300.0 ) ) |
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111 | { |
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112 | if (eAvailable > nucleonMass - piMass) { |
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113 | if( G4UniformRand() > atomicNumber/atomicWeight ) |
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114 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
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115 | else |
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116 | targetParticle.SetDefinitionAndUpdateE( aProton ); |
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117 | targetHasChanged = true; |
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118 | } |
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119 | } |
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120 | |
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121 | for( G4int i=0; i<vecLen; ++i ) |
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122 | { |
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123 | if( antiTest && ( |
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124 | vec[i]->GetDefinition() == aPiPlus || |
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125 | vec[i]->GetDefinition() == aPiZero || |
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126 | vec[i]->GetDefinition() == aPiMinus ) && |
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127 | ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) && |
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128 | ( G4UniformRand() <= atomicWeight/300.0 ) ) |
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129 | { |
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130 | if (eAvailable > nucleonMass - piMass) { |
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131 | if( G4UniformRand() > atomicNumber/atomicWeight ) |
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132 | vec[i]->SetDefinitionAndUpdateE( aNeutron ); |
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133 | else |
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134 | vec[i]->SetDefinitionAndUpdateE( aProton ); |
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135 | } |
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136 | } |
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137 | } |
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138 | |
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139 | return true; |
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140 | } |
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141 | |
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142 | |
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143 | /* end of file */ |
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