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 | #include "G4AdjointPhotoElectricModel.hh" |
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27 | #include "G4AdjointCSManager.hh" |
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28 | |
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29 | |
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30 | #include "G4Integrator.hh" |
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31 | #include "G4TrackStatus.hh" |
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32 | #include "G4ParticleChange.hh" |
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33 | #include "G4AdjointElectron.hh" |
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34 | #include "G4Gamma.hh" |
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35 | #include "G4AdjointGamma.hh" |
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36 | |
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37 | //////////////////////////////////////////////////////////////////////////////// |
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38 | // |
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39 | G4AdjointPhotoElectricModel::G4AdjointPhotoElectricModel(): |
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40 | G4VEmAdjointModel("AdjointPEEffect") |
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41 | |
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42 | { SetUseMatrix(false); |
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43 | current_eEnergy =0.; |
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44 | totAdjointCS=0.; |
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45 | } |
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46 | //////////////////////////////////////////////////////////////////////////////// |
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47 | // |
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48 | G4AdjointPhotoElectricModel::~G4AdjointPhotoElectricModel() |
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49 | {;} |
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50 | |
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51 | //////////////////////////////////////////////////////////////////////////////// |
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52 | // |
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53 | void G4AdjointPhotoElectricModel::SampleSecondaries(const G4Track& aTrack, |
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54 | G4bool IsScatProjToProjCase, |
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55 | G4ParticleChange* fParticleChange) |
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56 | { if (IsScatProjToProjCase) return ; |
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57 | |
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58 | //Compute the totAdjointCS vectors if not already done for the current couple and electron energy |
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59 | const G4MaterialCutsCouple* aCouple = aTrack.GetMaterialCutsCouple(); |
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60 | const G4DynamicParticle* aDynPart = aTrack.GetDynamicParticle() ; |
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61 | G4double electronEnergy = aDynPart->GetKineticEnergy(); |
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62 | G4ThreeVector electronDirection= aDynPart->GetMomentumDirection() ; |
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63 | totAdjointCS = AdjointCrossSection(aCouple, electronEnergy,IsScatProjToProjCase); |
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64 | |
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65 | |
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66 | //Sample gamma energy |
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67 | //------------- |
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68 | ///////////////////////////////////////////////////////////////////////////////// |
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69 | // Module: G4ContinuousGainOfEnergy.hh |
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70 | // Author: L. Desorgher |
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71 | // Date: 1 September 2007 |
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72 | // Organisation: SpaceIT GmbH |
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73 | // Customer: ESA/ESTEC |
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74 | ///////////////////////////////////////////////////////////////////////////////// |
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75 | // |
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76 | // CHANGE HISTORY |
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77 | // -------------- |
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78 | // ChangeHistory: |
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79 | // 1 September 2007 creation by L. Desorgher |
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80 | // |
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81 | //------------------------------------------------------------- |
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82 | // Documentation: |
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83 | // Modell for the adjoint compton scattering |
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84 | // |
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85 | |
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86 | //Sample element |
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87 | //------------- |
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88 | const G4ElementVector* theElementVector = currentMaterial->GetElementVector(); |
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89 | const G4double* theAtomNumDensityVector = currentMaterial->GetVecNbOfAtomsPerVolume(); |
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90 | size_t nelm = currentMaterial->GetNumberOfElements(); |
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91 | G4double rand_CS= totAdjointCS*G4UniformRand(); |
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92 | for (index_element=0; index_element<nelm-1; index_element++){ |
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93 | if (rand_CS<xsec[index_element]) break; |
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94 | } |
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95 | |
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96 | //Sample shell and binding energy |
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97 | //------------- |
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98 | rand_CS= totAdjointCS*G4UniformRand()/theAtomNumDensityVector[index_element]; |
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99 | G4int nShells = (*theElementVector)[index_element]->GetNbOfAtomicShells(); |
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100 | G4int i = 0; |
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101 | for (i=0; i<nShells-1; i++){ |
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102 | if (rand_CS<shell_prob[index_element][i]) break; |
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103 | } |
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104 | G4double gammaEnergy= electronEnergy+(*theElementVector)[index_element]->GetAtomicShell(i); |
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105 | |
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106 | //Sample cos theta |
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107 | //Copy of the G4PEEffectModel cos theta sampling method ElecCosThetaDistribution. |
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108 | //This method cannot be used directly from G4PEEffectModel because it is a friend method. I should ask Vladimir to change that |
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109 | //------------------------------------------------------------------------------------------------ |
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110 | //G4double cos_theta = theDirectPEEffectModel->ElecCosThetaDistribution(electronEnergy); |
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111 | |
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112 | G4double cos_theta = 1.; |
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113 | G4double gamma = 1. + electronEnergy/electron_mass_c2; |
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114 | if (gamma <= 5.) { |
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115 | G4double beta = std::sqrt(gamma*gamma-1.)/gamma; |
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116 | G4double b = 0.5*gamma*(gamma-1.)*(gamma-2); |
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117 | |
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118 | G4double rndm,term,greject,grejsup; |
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119 | if (gamma < 2.) grejsup = gamma*gamma*(1.+b-beta*b); |
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120 | else grejsup = gamma*gamma*(1.+b+beta*b); |
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121 | |
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122 | do { rndm = 1.-2*G4UniformRand(); |
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123 | cos_theta = (rndm+beta)/(rndm*beta+1.); |
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124 | term = 1.-beta*cos_theta; |
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125 | greject = (1.-cos_theta*cos_theta)*(1.+b*term)/(term*term); |
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126 | } while(greject < G4UniformRand()*grejsup); |
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127 | } |
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128 | |
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129 | // direction of the adjoint gamma electron |
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130 | //--------------------------------------- |
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131 | |
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132 | |
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133 | G4double sin_theta = std::sqrt(1.-cos_theta*cos_theta); |
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134 | G4double Phi = twopi * G4UniformRand(); |
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135 | G4double dirx = sin_theta*std::cos(Phi),diry = sin_theta*std::sin(Phi),dirz = cos_theta; |
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136 | G4ThreeVector adjoint_gammaDirection(dirx,diry,dirz); |
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137 | adjoint_gammaDirection.rotateUz(electronDirection); |
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138 | |
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139 | |
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140 | |
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141 | //Weight correction |
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142 | //----------------------- |
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143 | CorrectPostStepWeight(fParticleChange, aTrack.GetWeight(), electronEnergy,gammaEnergy); |
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144 | |
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145 | |
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146 | |
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147 | //Create secondary and modify fParticleChange |
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148 | //-------------------------------------------- |
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149 | G4DynamicParticle* anAdjointGamma = new G4DynamicParticle ( |
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150 | G4AdjointGamma::AdjointGamma(),adjoint_gammaDirection, gammaEnergy); |
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151 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
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152 | fParticleChange->AddSecondary(anAdjointGamma); |
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153 | |
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154 | |
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155 | |
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156 | |
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157 | |
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158 | } |
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159 | |
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160 | //////////////////////////////////////////////////////////////////////////////// |
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161 | // |
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162 | |
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163 | G4double G4AdjointPhotoElectricModel::AdjointCrossSection(const G4MaterialCutsCouple* aCouple, |
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164 | G4double electronEnergy, |
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165 | G4bool IsScatProjToProjCase) |
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166 | { if (IsScatProjToProjCase) return 0.; |
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167 | if (aCouple !=currentCouple || current_eEnergy !=electronEnergy) { |
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168 | totAdjointCS = 0.; |
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169 | DefineCurrentMaterialAndElectronEnergy(aCouple, electronEnergy); |
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170 | const G4ElementVector* theElementVector = currentMaterial->GetElementVector(); |
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171 | const G4double* theAtomNumDensityVector = currentMaterial->GetVecNbOfAtomsPerVolume(); |
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172 | size_t nelm = currentMaterial->GetNumberOfElements(); |
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173 | for (index_element=0;index_element<nelm;index_element++){ |
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174 | |
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175 | totAdjointCS +=AdjointCrossSectionPerAtom((*theElementVector)[index_element],electronEnergy)*theAtomNumDensityVector[index_element]; |
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176 | xsec[index_element] = totAdjointCS; |
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177 | } |
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178 | } |
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179 | return totAdjointCS; |
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180 | |
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181 | |
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182 | } |
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183 | //////////////////////////////////////////////////////////////////////////////// |
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184 | // |
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185 | |
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186 | G4double G4AdjointPhotoElectricModel::AdjointCrossSectionPerAtom(const G4Element* anElement,G4double electronEnergy) |
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187 | { |
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188 | G4int nShells = anElement->GetNbOfAtomicShells(); |
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189 | G4double Z= anElement->GetZ(); |
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190 | G4double N= anElement->GetN(); |
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191 | G4int i = 0; |
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192 | G4double B0=anElement->GetAtomicShell(0); |
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193 | G4double gammaEnergy = electronEnergy+B0; |
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194 | G4double adjointCS = theDirectPEEffectModel->ComputeCrossSectionPerAtom(G4Gamma::Gamma(),gammaEnergy,Z,N,0.,0.)*electronEnergy/gammaEnergy; |
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195 | shell_prob[index_element][0] = adjointCS; |
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196 | for (i=1;i<nShells;i++){ |
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197 | //G4cout<<i<<std::endl; |
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198 | G4double Bi_= anElement->GetAtomicShell(i-1); |
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199 | G4double Bi = anElement->GetAtomicShell(i); |
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200 | //G4cout<<Bi_<<'\t'<<Bi<<std::endl; |
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201 | if (electronEnergy <Bi_-Bi) { |
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202 | gammaEnergy = electronEnergy+Bi; |
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203 | adjointCS +=theDirectPEEffectModel->ComputeCrossSectionPerAtom(G4Gamma::Gamma(),gammaEnergy,anElement->GetZ(),N,0.,0.)*electronEnergy/gammaEnergy; |
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204 | } |
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205 | shell_prob[index_element][i] = adjointCS; |
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206 | |
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207 | } |
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208 | |
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209 | return adjointCS; |
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210 | |
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211 | } |
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212 | //////////////////////////////////////////////////////////////////////////////// |
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213 | // |
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214 | |
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215 | void G4AdjointPhotoElectricModel::DefineCurrentMaterialAndElectronEnergy(const G4MaterialCutsCouple* couple, G4double anEnergy) |
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216 | { currentCouple = const_cast<G4MaterialCutsCouple*> (couple); |
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217 | currentMaterial = const_cast<G4Material*> (couple->GetMaterial()); |
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218 | currentCoupleIndex = couple->GetIndex(); |
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219 | currentMaterialIndex = currentMaterial->GetIndex(); |
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220 | current_eEnergy = anEnergy; |
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221 | } |
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