[966] | 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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