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2 | // ******************************************************************** |
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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 | // $Id: G4BGGPionElasticXS.cc,v 1.8 2010/10/12 06:03:37 dennis Exp $ |
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27 | // GEANT4 tag $Name: hadr-cross-V09-03-12 $ |
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28 | // |
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29 | // ------------------------------------------------------------------- |
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30 | // |
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31 | // GEANT4 Class file |
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32 | // |
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33 | // |
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34 | // File name: G4BGGPionElasticXS |
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35 | // |
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36 | // Author: Vladimir Ivanchenko |
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37 | // |
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38 | // Creation date: 01.10.2003 |
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39 | // Modifications: |
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40 | // |
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41 | // |
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42 | // ------------------------------------------------------------------- |
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43 | // |
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44 | |
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45 | #include "G4BGGPionElasticXS.hh" |
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46 | #include "G4GlauberGribovCrossSection.hh" |
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47 | #include "G4UPiNuclearCrossSection.hh" |
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48 | #include "G4HadronNucleonXsc.hh" |
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49 | #include "G4PionPlus.hh" |
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50 | #include "G4PionMinus.hh" |
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51 | #include "G4NistManager.hh" |
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52 | |
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53 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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54 | |
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55 | G4BGGPionElasticXS::G4BGGPionElasticXS(const G4ParticleDefinition*) |
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56 | { |
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57 | verboseLevel = 0; |
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58 | fGlauberEnergy = 91.*GeV; |
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59 | fLowEnergy = 20.*MeV; |
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60 | fPion = 0; |
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61 | fGlauber = 0; |
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62 | fHadron = 0; |
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63 | particle = 0; |
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64 | isPiplus = false; |
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65 | isInitialized = false; |
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66 | } |
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67 | |
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68 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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69 | |
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70 | G4BGGPionElasticXS::~G4BGGPionElasticXS() |
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71 | { |
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72 | delete fGlauber; |
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73 | delete fPion; |
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74 | delete fHadron; |
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75 | } |
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76 | |
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77 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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78 | |
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79 | G4double |
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80 | G4BGGPionElasticXS::GetZandACrossSection(const G4DynamicParticle* dp, |
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81 | G4int Z, G4int A, G4double) |
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82 | { |
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83 | G4double cross = 0.0; |
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84 | G4double ekin = dp->GetKineticEnergy(); |
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85 | // G4int iz = G4int(Z); |
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86 | if(Z > 92) Z = 92; |
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87 | |
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88 | if(ekin <= fLowEnergy) { |
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89 | cross = theCoulombFac[Z]; |
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90 | if(isPiplus) { cross *= CoulombFactor(ekin, A); } |
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91 | |
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92 | } else if(Z == 1) { |
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93 | if( A < 2) { |
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94 | fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton()); |
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95 | cross = fHadron->GetElasticHadronNucleonXsc(); |
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96 | } else { |
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97 | fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton()); |
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98 | cross = fHadron->GetElasticHadronNucleonXsc(); |
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99 | fHadron->GetHadronNucleonXscNS(dp, G4Neutron::Neutron()); |
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100 | cross += fHadron->GetElasticHadronNucleonXsc(); |
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101 | } |
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102 | } else if(ekin > fGlauberEnergy) { |
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103 | cross = theGlauberFac[Z]*fGlauber->GetElasticGlauberGribov(dp, Z, A); |
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104 | } else { |
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105 | cross = fPion->GetElasticCrossSection(dp, Z, A); |
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106 | } |
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107 | |
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108 | if(verboseLevel > 1) |
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109 | G4cout << "G4BGGPionElasticXS::GetCrossSection for " |
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110 | << dp->GetDefinition()->GetParticleName() |
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111 | << " Ekin(GeV)= " << dp->GetKineticEnergy() |
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112 | << " in nucleus Z= " << Z << " A= " << A |
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113 | << " XS(b)= " << cross/barn |
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114 | << G4endl; |
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115 | |
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116 | return cross; |
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117 | } |
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118 | |
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119 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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120 | |
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121 | void G4BGGPionElasticXS::BuildPhysicsTable(const G4ParticleDefinition& p) |
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122 | { |
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123 | if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) { |
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124 | particle = &p; |
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125 | Initialise(); |
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126 | } else { |
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127 | G4cout << "### G4BGGPionElasticXS WARNING: is not applicable to " |
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128 | << p.GetParticleName() |
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129 | << G4endl; |
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130 | } |
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131 | } |
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132 | |
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133 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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134 | |
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135 | void G4BGGPionElasticXS::DumpPhysicsTable(const G4ParticleDefinition&) |
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136 | { |
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137 | G4cout << "G4BGGPionElasticXS:"<<G4endl; |
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138 | } |
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139 | |
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140 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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141 | |
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142 | void G4BGGPionElasticXS::Initialise() |
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143 | { |
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144 | if(isInitialized) return; |
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145 | isInitialized = true; |
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146 | |
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147 | fPion = new G4UPiNuclearCrossSection(); |
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148 | fGlauber = new G4GlauberGribovCrossSection(); |
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149 | fHadron = new G4HadronNucleonXsc(); |
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150 | fPion->BuildPhysicsTable(*particle); |
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151 | fGlauber->BuildPhysicsTable(*particle); |
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152 | if(particle == G4PionPlus::PionPlus()) isPiplus = true; |
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153 | |
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154 | G4ParticleDefinition* part = const_cast<G4ParticleDefinition*>(particle); |
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155 | G4ThreeVector mom(0.0,0.0,1.0); |
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156 | G4DynamicParticle dp(part, mom, fGlauberEnergy); |
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157 | |
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158 | G4NistManager* nist = G4NistManager::Instance(); |
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159 | |
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160 | G4double csup, csdn; |
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161 | G4int A; |
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162 | |
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163 | if(verboseLevel > 0) G4cout << "### G4BGGPionElasticXS::Initialise for " |
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164 | << particle->GetParticleName() << G4endl; |
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165 | |
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166 | for(G4int iz=2; iz<93; iz++) { |
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167 | |
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168 | G4double Z = G4double(iz); |
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169 | A = G4lrint(nist->GetAtomicMassAmu(iz)); |
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170 | |
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171 | csup = fGlauber->GetElasticGlauberGribov(&dp, iz, A); |
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172 | csdn = fPion->GetElasticCrossSection(&dp, iz, A); |
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173 | |
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174 | theGlauberFac[iz] = csdn/csup; |
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175 | if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A |
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176 | << " factor= " << theGlauberFac[iz] << G4endl; |
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177 | } |
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178 | dp.SetKineticEnergy(fLowEnergy); |
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179 | fHadron->GetHadronNucleonXscNS(&dp, G4Proton::Proton()); |
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180 | theCoulombFac[1] = fHadron->GetElasticHadronNucleonXsc(); |
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181 | if(isPiplus) { theCoulombFac[1] /= CoulombFactor(fLowEnergy,1); } |
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182 | |
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183 | for(G4int iz=2; iz<93; iz++) { |
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184 | |
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185 | G4double Z = G4double(iz); |
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186 | A = G4lrint(nist->GetAtomicMassAmu(iz)); |
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187 | |
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188 | theCoulombFac[iz] = fPion->GetElasticCrossSection(&dp, iz, A); |
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189 | if(isPiplus) { theCoulombFac[iz] /= CoulombFactor(fLowEnergy,A); } |
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190 | if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A |
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191 | << " factor= " << theCoulombFac[iz] << G4endl; |
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192 | } |
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193 | } |
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194 | |
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195 | |
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196 | G4double G4BGGPionElasticXS::CoulombFactor(G4double kinEnergy, G4int A) |
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197 | { |
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198 | G4double res= 0.0; |
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199 | if(kinEnergy <= DBL_MIN) return res; |
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200 | else if(A < 2) return kinEnergy*kinEnergy; |
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201 | |
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202 | G4double elog = std::log10(kinEnergy/GeV); |
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203 | G4double aa = A; |
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204 | |
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205 | // from G4ProtonInelasticCrossSection |
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206 | G4double f1 = 8.0 - 8.0/aa - 0.008*aa; |
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207 | G4double f2 = 2.34 - 5.4/aa - 0.0028*aa; |
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208 | |
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209 | res = 1.0/(1.0 + std::exp(-f1*(elog + f2))); |
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210 | |
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211 | f1 = 5.6 - 0.016*aa; |
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212 | f2 = 1.37 + 1.37/aa; |
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213 | res *= ( 1.0 + (0.8 + 18./aa - 0.002*aa)/(1.0 + std::exp(f1*(elog + f2)))); |
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214 | return res; |
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215 | } |
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216 | |
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