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15 | // * use. Please see the license in the file LICENSE and URL above * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4ChargeExchangeProcess.cc,v 1.15 2008/11/27 16:43:00 vnivanch Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
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29 | // |
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30 | // |
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31 | // Geant4 Hadron Charge Exchange Process -- source file |
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32 | // |
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33 | // Created 21 April 2006 V.Ivanchenko |
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34 | // |
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35 | // Modified: |
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36 | // 24-Apr-06 V.Ivanchenko add neutron scattering on hydrogen from CHIPS |
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37 | // 07-Jun-06 V.Ivanchenko fix problem of rotation of final state |
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38 | // 25-Jul-06 V.Ivanchenko add 19 MeV low energy for CHIPS |
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39 | // 23-Jan-07 V.Ivanchenko add cross section interfaces with Z and A |
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40 | // and do not use CHIPS for cross sections |
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41 | // |
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42 | |
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43 | #include "G4ChargeExchangeProcess.hh" |
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44 | #include "globals.hh" |
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45 | #include "G4CrossSectionDataStore.hh" |
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46 | #include "G4HadronElasticDataSet.hh" |
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47 | #include "G4Element.hh" |
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48 | #include "G4ElementVector.hh" |
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49 | #include "G4IsotopeVector.hh" |
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50 | #include "G4Neutron.hh" |
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51 | #include "G4Proton.hh" |
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52 | #include "G4PhysicsLinearVector.hh" |
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53 | |
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54 | G4ChargeExchangeProcess::G4ChargeExchangeProcess(const G4String& procName) |
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55 | : G4HadronicProcess(procName), first(true) |
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56 | { |
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57 | SetProcessSubType(fChargeExchange); |
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58 | thEnergy = 20.*MeV; |
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59 | verboseLevel= 1; |
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60 | AddDataSet(new G4HadronElasticDataSet); |
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61 | theProton = G4Proton::Proton(); |
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62 | theNeutron = G4Neutron::Neutron(); |
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63 | theAProton = G4AntiProton::AntiProton(); |
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64 | theANeutron = G4AntiNeutron::AntiNeutron(); |
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65 | thePiPlus = G4PionPlus::PionPlus(); |
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66 | thePiMinus = G4PionMinus::PionMinus(); |
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67 | thePiZero = G4PionZero::PionZero(); |
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68 | theKPlus = G4KaonPlus::KaonPlus(); |
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69 | theKMinus = G4KaonMinus::KaonMinus(); |
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70 | theK0S = G4KaonZeroShort::KaonZeroShort(); |
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71 | theK0L = G4KaonZeroLong::KaonZeroLong(); |
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72 | theL = G4Lambda::Lambda(); |
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73 | theAntiL = G4AntiLambda::AntiLambda(); |
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74 | theSPlus = G4SigmaPlus::SigmaPlus(); |
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75 | theASPlus = G4AntiSigmaPlus::AntiSigmaPlus(); |
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76 | theSMinus = G4SigmaMinus::SigmaMinus(); |
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77 | theASMinus = G4AntiSigmaMinus::AntiSigmaMinus(); |
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78 | theS0 = G4SigmaZero::SigmaZero(); |
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79 | theAS0 = G4AntiSigmaZero::AntiSigmaZero(); |
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80 | theXiMinus = G4XiMinus::XiMinus(); |
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81 | theXi0 = G4XiZero::XiZero(); |
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82 | theAXiMinus = G4AntiXiMinus::AntiXiMinus(); |
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83 | theAXi0 = G4AntiXiZero::AntiXiZero(); |
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84 | theOmega = G4OmegaMinus::OmegaMinus(); |
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85 | theAOmega = G4AntiOmegaMinus::AntiOmegaMinus(); |
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86 | theD = G4Deuteron::Deuteron(); |
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87 | theT = G4Triton::Triton(); |
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88 | theA = G4Alpha::Alpha(); |
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89 | theA = G4He3::He3(); |
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90 | } |
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91 | |
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92 | G4ChargeExchangeProcess::~G4ChargeExchangeProcess() |
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93 | { |
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94 | delete factors; |
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95 | } |
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96 | |
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97 | void G4ChargeExchangeProcess:: |
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98 | BuildPhysicsTable(const G4ParticleDefinition& aParticleType) |
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99 | { |
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100 | if(first) { |
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101 | first = false; |
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102 | theParticle = &aParticleType; |
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103 | pPDG = theParticle->GetPDGEncoding(); |
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104 | |
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105 | store = G4HadronicProcess::GetCrossSectionDataStore(); |
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106 | |
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107 | const size_t n = 10; |
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108 | if(theParticle == thePiPlus || theParticle == thePiMinus || |
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109 | theParticle == theKPlus || theParticle == theKMinus || |
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110 | theParticle == theK0S || theParticle == theK0L) { |
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111 | |
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112 | G4double F[n] = {0.33,0.27,0.29,0.31,0.27,0.18,0.13,0.1,0.09,0.07}; |
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113 | factors = new G4PhysicsLinearVector(0.0,2.0*GeV,n); |
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114 | for(size_t i=0; i<n; i++) {factors->PutValue(i,F[i]);} |
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115 | |
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116 | } else { |
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117 | |
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118 | G4double F[n] = {0.50,0.45,0.40,0.35,0.30,0.25,0.06,0.04,0.005,0.0}; |
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119 | factors = new G4PhysicsLinearVector(0.0,4.0*GeV,n); |
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120 | for(size_t i=0; i<n; i++) {factors->PutValue(i,F[i]);} |
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121 | } |
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122 | //factors->SetSpline(true); |
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123 | |
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124 | if(verboseLevel>1) |
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125 | G4cout << "G4ChargeExchangeProcess for " |
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126 | << theParticle->GetParticleName() |
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127 | << G4endl; |
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128 | } |
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129 | G4HadronicProcess::BuildPhysicsTable(aParticleType); |
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130 | } |
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131 | |
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132 | G4double G4ChargeExchangeProcess::GetMicroscopicCrossSection( |
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133 | const G4DynamicParticle* dp, |
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134 | const G4Element* elm, |
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135 | G4double temp) |
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136 | { |
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137 | // gives the microscopic cross section in GEANT4 internal units |
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138 | G4double Z = elm->GetZ(); |
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139 | G4int iz = G4int(Z); |
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140 | G4double x = 0.0; |
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141 | |
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142 | // The process is effective only above the threshold |
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143 | if(iz == 1 || dp->GetKineticEnergy() < thEnergy) return x; |
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144 | |
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145 | if(verboseLevel>1) |
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146 | G4cout << "G4ChargeExchangeProcess compute GHAD CS for element " |
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147 | << elm->GetName() |
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148 | << G4endl; |
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149 | x = store->GetCrossSection(dp, elm, temp); |
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150 | |
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151 | if(verboseLevel>1) |
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152 | G4cout << "G4ChargeExchangeProcess cross(mb)= " << x/millibarn |
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153 | << " E(MeV)= " << dp->GetKineticEnergy() |
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154 | << " " << theParticle->GetParticleName() |
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155 | << " in Z= " << iz |
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156 | << G4endl; |
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157 | G4bool b; |
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158 | G4double A = elm->GetN(); |
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159 | G4double ptot = dp->GetTotalMomentum(); |
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160 | x *= factors->GetValue(ptot, b)/std::pow(A, 0.42); |
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161 | if(theParticle == thePiPlus || theParticle == theProton || |
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162 | theParticle == theKPlus || theParticle == theANeutron) |
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163 | { x *= (1.0 - Z/A); } |
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164 | |
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165 | else if(theParticle == thePiMinus || theParticle == theNeutron || |
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166 | theParticle == theKMinus || theParticle == theAProton) |
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167 | { x *= Z/A; } |
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168 | |
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169 | if(theParticle->GetPDGMass() < GeV) { |
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170 | if(ptot > 2.*GeV) x *= 4.0*GeV*GeV/(ptot*ptot); |
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171 | } |
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172 | |
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173 | if(verboseLevel>1) |
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174 | G4cout << "Corrected cross(mb)= " << x/millibarn << G4endl; |
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175 | |
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176 | return x; |
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177 | } |
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178 | |
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179 | G4bool G4ChargeExchangeProcess:: |
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180 | IsApplicable(const G4ParticleDefinition& aParticleType) |
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181 | { |
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182 | const G4ParticleDefinition* p = &aParticleType; |
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183 | return (p == thePiPlus || p == thePiMinus || |
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184 | p == theProton || p == theNeutron || |
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185 | p == theAProton|| p == theANeutron|| |
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186 | p == theKPlus || p == theKMinus || |
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187 | p == theK0S || p == theK0L || |
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188 | p == theL); |
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189 | } |
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190 | |
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191 | void G4ChargeExchangeProcess:: |
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192 | DumpPhysicsTable(const G4ParticleDefinition& aParticleType) |
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193 | { |
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194 | store->DumpPhysicsTable(aParticleType); |
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195 | } |
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