[968] | 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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[1347] | 26 | // $Id: G4PenelopeGammaConversionModel.cc,v 1.7 2010/11/25 09:45:13 pandola Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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[968] | 28 | // |
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| 29 | // Author: Luciano Pandola |
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| 30 | // |
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| 31 | // History: |
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| 32 | // -------- |
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| 33 | // 06 Oct 2008 L Pandola Migration from process to model |
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[1055] | 34 | // 17 Apr 2009 V Ivanchenko Cleanup initialisation and generation of secondaries: |
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| 35 | // - apply internal high-energy limit only in constructor |
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| 36 | // - do not apply low-energy limit (default is 0) |
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| 37 | // - do not apply production threshold on level of the model |
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| 38 | // 19 May 2009 L Pandola Explicitely set to zero pointers deleted in |
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| 39 | // Initialise(), since they might be checked later on |
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[968] | 40 | // |
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| 41 | |
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| 42 | #include "G4PenelopeGammaConversionModel.hh" |
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| 43 | #include "G4ParticleDefinition.hh" |
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| 44 | #include "G4MaterialCutsCouple.hh" |
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| 45 | #include "G4ProductionCutsTable.hh" |
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| 46 | #include "G4DynamicParticle.hh" |
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| 47 | #include "G4Element.hh" |
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| 48 | #include "G4Gamma.hh" |
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| 49 | #include "G4Electron.hh" |
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| 50 | #include "G4Positron.hh" |
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| 51 | #include "G4CrossSectionHandler.hh" |
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[1347] | 52 | #include "G4VEMDataSet.hh" |
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[968] | 53 | |
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| 54 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 55 | |
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| 56 | |
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| 57 | G4PenelopeGammaConversionModel::G4PenelopeGammaConversionModel(const G4ParticleDefinition*, |
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| 58 | const G4String& nam) |
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| 59 | :G4VEmModel(nam),fTheScreeningRadii(0),crossSectionHandler(0),isInitialised(false) |
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| 60 | { |
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| 61 | fIntrinsicLowEnergyLimit = 2.0*electron_mass_c2; |
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| 62 | fIntrinsicHighEnergyLimit = 100.0*GeV; |
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| 63 | fSmallEnergy = 1.1*MeV; |
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| 64 | |
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[1055] | 65 | // SetLowEnergyLimit(fIntrinsicLowEnergyLimit); |
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[968] | 66 | SetHighEnergyLimit(fIntrinsicHighEnergyLimit); |
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| 67 | // |
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| 68 | verboseLevel= 0; |
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| 69 | // Verbosity scale: |
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| 70 | // 0 = nothing |
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| 71 | // 1 = warning for energy non-conservation |
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| 72 | // 2 = details of energy budget |
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| 73 | // 3 = calculation of cross sections, file openings, sampling of atoms |
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| 74 | // 4 = entering in methods |
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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 | G4PenelopeGammaConversionModel::~G4PenelopeGammaConversionModel() |
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| 80 | { |
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| 81 | if (crossSectionHandler) delete crossSectionHandler; |
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| 82 | if (fTheScreeningRadii) delete fTheScreeningRadii; |
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| 83 | } |
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| 84 | |
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| 85 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 86 | |
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| 87 | void G4PenelopeGammaConversionModel::Initialise(const G4ParticleDefinition*, |
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| 88 | const G4DataVector& ) |
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| 89 | { |
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| 90 | if (verboseLevel > 3) |
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| 91 | G4cout << "Calling G4PenelopeGammaConversionModel::Initialise()" << G4endl; |
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| 92 | |
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| 93 | //Delete the old cross section handler, if necessary |
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| 94 | if (crossSectionHandler) |
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| 95 | { |
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| 96 | crossSectionHandler->Clear(); |
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| 97 | delete crossSectionHandler; |
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[1055] | 98 | crossSectionHandler = 0; |
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[968] | 99 | } |
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| 100 | |
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| 101 | //Re-initialize cross section handler |
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| 102 | crossSectionHandler = new G4CrossSectionHandler(); |
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[1055] | 103 | crossSectionHandler->Initialise(0,fIntrinsicLowEnergyLimit,HighEnergyLimit(),400); |
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[968] | 104 | crossSectionHandler->Clear(); |
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| 105 | G4String crossSectionFile = "penelope/pp-cs-pen-"; |
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| 106 | crossSectionHandler->LoadData(crossSectionFile); |
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| 107 | //This is used to retrieve cross section values later on |
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[1347] | 108 | G4VEMDataSet* emdata = |
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| 109 | crossSectionHandler->BuildMeanFreePathForMaterials(); |
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| 110 | //The method BuildMeanFreePathForMaterials() is required here only to force |
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| 111 | //the building of an internal table: the output pointer can be deleted |
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| 112 | delete emdata; |
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[968] | 113 | |
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| 114 | if (verboseLevel > 2) |
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| 115 | G4cout << "Loaded cross section files for PenelopeGammaConversion" << G4endl; |
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| 116 | |
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[1055] | 117 | if (verboseLevel > 0) { |
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| 118 | G4cout << "Penelope Gamma Conversion model is initialized " << G4endl |
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| 119 | << "Energy range: " |
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| 120 | << LowEnergyLimit() / MeV << " MeV - " |
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| 121 | << HighEnergyLimit() / GeV << " GeV" |
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| 122 | << G4endl; |
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| 123 | } |
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[968] | 124 | |
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| 125 | if(isInitialised) return; |
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[1055] | 126 | fParticleChange = GetParticleChangeForGamma(); |
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[968] | 127 | isInitialised = true; |
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| 128 | } |
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| 129 | |
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| 130 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 131 | |
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| 132 | G4double G4PenelopeGammaConversionModel::ComputeCrossSectionPerAtom( |
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| 133 | const G4ParticleDefinition*, |
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| 134 | G4double energy, |
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| 135 | G4double Z, G4double, |
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| 136 | G4double, G4double) |
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| 137 | { |
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| 138 | // |
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| 139 | // Penelope model. |
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| 140 | // Cross section (including triplet production) read from database and managed |
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| 141 | // through the G4CrossSectionHandler utility. Cross section data are from |
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| 142 | // M.J. Berger and J.H. Hubbel (XCOM), Report NBSIR 887-3598 |
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| 143 | // |
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| 144 | |
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| 145 | if (verboseLevel > 3) |
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| 146 | G4cout << "Calling ComputeCrossSectionPerAtom() of G4PenelopePhotoElectricModel" << G4endl; |
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| 147 | |
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| 148 | G4int iZ = (G4int) Z; |
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[1055] | 149 | // if (!crossSectionHandler) //VI: should not be checked in run time |
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| 150 | // { |
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| 151 | // G4cout << "G4PenelopeGammaConversionModel::ComputeCrossSectionPerAtom" << G4endl; |
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| 152 | // G4cout << "The cross section handler is not correctly initialized" << G4endl; |
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| 153 | // G4Exception(); |
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| 154 | // } |
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[968] | 155 | G4double cs = crossSectionHandler->FindValue(iZ,energy); |
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| 156 | |
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| 157 | if (verboseLevel > 2) |
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| 158 | G4cout << "Gamma conversion cross section at " << energy/MeV << " MeV for Z=" << Z << |
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| 159 | " = " << cs/barn << " barn" << G4endl; |
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| 160 | return cs; |
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| 161 | } |
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| 162 | |
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| 163 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 164 | |
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[1055] | 165 | void |
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| 166 | G4PenelopeGammaConversionModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect, |
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| 167 | const G4MaterialCutsCouple* couple, |
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| 168 | const G4DynamicParticle* aDynamicGamma, |
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| 169 | G4double, |
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| 170 | G4double) |
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[968] | 171 | { |
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| 172 | // |
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| 173 | // Penelope model. |
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| 174 | // Final state is sampled according to the Bethe-Heitler model with Coulomb |
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| 175 | // corrections, according to the semi-empirical model of |
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| 176 | // J. Baro' et al., Radiat. Phys. Chem. 44 (1994) 531. |
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| 177 | // |
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| 178 | // The model uses the high energy Coulomb correction from |
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| 179 | // H. Davies et al., Phys. Rev. 93 (1954) 788 |
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| 180 | // and atomic screening radii tabulated from |
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| 181 | // J.H. Hubbel et al., J. Phys. Chem. Ref. Data 9 (1980) 1023 |
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| 182 | // for Z= 1 to 92. This managed in this model by the method |
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| 183 | // GetScreeningRadius(). |
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| 184 | // |
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| 185 | if (verboseLevel > 3) |
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| 186 | G4cout << "Calling SamplingSecondaries() of G4PenelopeGammaConversionModel" << G4endl; |
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| 187 | |
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| 188 | G4double photonEnergy = aDynamicGamma->GetKineticEnergy(); |
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| 189 | |
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[1055] | 190 | // Always kill primary |
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| 191 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
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| 192 | fParticleChange->SetProposedKineticEnergy(0.); |
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| 193 | |
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| 194 | if (photonEnergy <= fIntrinsicLowEnergyLimit) |
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| 195 | { |
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[968] | 196 | fParticleChange->ProposeLocalEnergyDeposit(photonEnergy); |
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| 197 | return ; |
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[1055] | 198 | } |
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[968] | 199 | |
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| 200 | G4ParticleMomentum photonDirection = aDynamicGamma->GetMomentumDirection(); |
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| 201 | |
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| 202 | G4double eps ; |
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| 203 | G4double eki = electron_mass_c2 / photonEnergy ; |
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| 204 | |
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| 205 | // Do it fast if photon energy < 1.1 MeV |
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| 206 | if (photonEnergy < fSmallEnergy ) |
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| 207 | { |
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| 208 | eps = eki + (1-2*eki) * G4UniformRand(); |
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| 209 | } |
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| 210 | else |
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| 211 | { |
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| 212 | // Select randomly one element in the current material |
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| 213 | if (verboseLevel > 2) |
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| 214 | G4cout << "Going to select element in " << couple->GetMaterial()->GetName() << G4endl; |
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| 215 | //use crossSectionHandler instead of G4EmElementSelector because in this case |
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| 216 | //the dimension of the table is equal to the dimension of the database |
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| 217 | //(less interpolation errors) |
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| 218 | G4int Z_int = crossSectionHandler->SelectRandomAtom(couple,photonEnergy); |
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| 219 | if (verboseLevel > 2) |
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| 220 | G4cout << "Selected Z = " << Z_int << G4endl; |
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| 221 | |
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| 222 | //Low energy and Coulomb corrections |
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| 223 | G4double Z=(G4double) Z_int; |
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| 224 | G4double ZAlpha = Z*fine_structure_const; |
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| 225 | G4double ScreenRadius = GetScreeningRadius(Z); |
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| 226 | G4double funct1=0,g0=0; |
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| 227 | G4double g1min=0,g2min=0; |
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| 228 | funct1 = 4.0*std::log(ScreenRadius); |
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| 229 | g0 = funct1-4*CoulombCorrection(ZAlpha)+LowEnergyCorrection(ZAlpha,eki); |
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| 230 | G4double bmin = 2*eki*ScreenRadius; |
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| 231 | std::vector<G4double> ScreenFunctionValues = ScreenFunction(bmin); |
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| 232 | if (ScreenFunctionValues.size() != 2) |
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| 233 | { |
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| 234 | G4cout << "G4PenelopeGammaConversionModel::SampleSecondaries" << G4endl; |
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| 235 | G4cout << "ScreenFunction did not return 2 values! Something wrong! " << G4endl; |
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| 236 | G4Exception(); |
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| 237 | } |
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| 238 | g1min=g0+ScreenFunctionValues[0]; |
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| 239 | g2min=g0+ScreenFunctionValues[1]; |
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| 240 | G4double xr,a1,p1; |
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| 241 | xr=0.5-eki; |
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| 242 | a1=(2.0/3.0)*g1min*xr*xr; |
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| 243 | p1=a1/(a1+g2min); |
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| 244 | |
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| 245 | //Random sampling of eps |
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| 246 | G4double rand1,rand2,rand3,b; |
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| 247 | G4double g1; |
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| 248 | |
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| 249 | do{ |
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| 250 | rand1 = G4UniformRand(); |
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| 251 | if (rand1 < p1) { |
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| 252 | rand2 = 2.0*G4UniformRand()-1.0; |
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| 253 | if (rand2 < 0) { |
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| 254 | eps = 0.5 - xr*std::pow(std::abs(rand2),(1./3.)); |
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| 255 | } |
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| 256 | else |
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| 257 | { |
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| 258 | eps = 0.5 + xr*std::pow(rand2,(1./3.)); |
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| 259 | } |
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| 260 | b = (eki*ScreenRadius)/(2*eps*(1.0-eps)); |
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| 261 | std::vector<G4double> ScreenFunctionSampling = ScreenFunction(b); |
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| 262 | g1 = g0+ScreenFunctionSampling[0]; |
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| 263 | if (g1 < 0) g1=0; |
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| 264 | rand3 = G4UniformRand()*g1min; |
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| 265 | } |
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| 266 | else |
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| 267 | { |
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| 268 | eps = eki+2.0*xr*G4UniformRand(); |
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| 269 | b = (eki*ScreenRadius)/(2*eps*(1.0-eps)); |
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| 270 | std::vector<G4double> ScreenFunctionSampling = ScreenFunction(b); |
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| 271 | g1 = g0+ScreenFunctionSampling[1]; |
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| 272 | if (g1 < 0) g1=0; |
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| 273 | rand3 = G4UniformRand()*g2min; |
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| 274 | } |
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| 275 | } while (rand3>g1); |
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| 276 | } //End of eps sampling |
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| 277 | |
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| 278 | G4double electronTotEnergy = eps*photonEnergy; |
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| 279 | G4double positronTotEnergy = (1.0-eps)*photonEnergy; |
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| 280 | |
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| 281 | // Scattered electron (positron) angles. ( Z - axis along the parent photon) |
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| 282 | |
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| 283 | //electron kinematics |
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| 284 | G4double costheta_el,costheta_po; |
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| 285 | G4double phi_el,phi_po; |
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| 286 | G4double electronKineEnergy = std::max(0.,electronTotEnergy - electron_mass_c2) ; |
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| 287 | costheta_el = G4UniformRand()*2.0-1.0; |
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| 288 | G4double kk = std::sqrt(electronKineEnergy*(electronKineEnergy+2.*electron_mass_c2)); |
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| 289 | costheta_el = (costheta_el*electronTotEnergy+kk)/(electronTotEnergy+costheta_el*kk); |
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| 290 | phi_el = twopi * G4UniformRand() ; |
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| 291 | G4double dirX_el = std::sqrt(1.-costheta_el*costheta_el) * std::cos(phi_el); |
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| 292 | G4double dirY_el = std::sqrt(1.-costheta_el*costheta_el) * std::sin(phi_el); |
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| 293 | G4double dirZ_el = costheta_el; |
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| 294 | |
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| 295 | //positron kinematics |
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| 296 | G4double positronKineEnergy = std::max(0.,positronTotEnergy - electron_mass_c2) ; |
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| 297 | costheta_po = G4UniformRand()*2.0-1.0; |
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| 298 | kk = std::sqrt(positronKineEnergy*(positronKineEnergy+2.*electron_mass_c2)); |
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| 299 | costheta_po = (costheta_po*positronTotEnergy+kk)/(positronTotEnergy+costheta_po*kk); |
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| 300 | phi_po = twopi * G4UniformRand() ; |
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| 301 | G4double dirX_po = std::sqrt(1.-costheta_po*costheta_po) * std::cos(phi_po); |
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| 302 | G4double dirY_po = std::sqrt(1.-costheta_po*costheta_po) * std::sin(phi_po); |
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| 303 | G4double dirZ_po = costheta_po; |
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| 304 | |
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| 305 | // Kinematics of the created pair: |
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| 306 | // the electron and positron are assumed to have a symetric angular |
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| 307 | // distribution with respect to the Z axis along the parent photon |
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| 308 | G4double localEnergyDeposit = 0. ; |
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| 309 | |
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| 310 | //Generate explicitely the electron in the pair, only if it is > threshold |
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[1055] | 311 | //VI: applying cut here provides inconsistency |
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[968] | 312 | |
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[1055] | 313 | if (electronKineEnergy > 0.0) |
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[968] | 314 | { |
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| 315 | G4ThreeVector electronDirection ( dirX_el, dirY_el, dirZ_el); |
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| 316 | electronDirection.rotateUz(photonDirection); |
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| 317 | G4DynamicParticle* electron = new G4DynamicParticle (G4Electron::Electron(), |
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| 318 | electronDirection, |
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| 319 | electronKineEnergy); |
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| 320 | fvect->push_back(electron); |
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| 321 | } |
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| 322 | else |
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| 323 | { |
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| 324 | localEnergyDeposit += electronKineEnergy; |
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| 325 | electronKineEnergy = 0; |
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| 326 | } |
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| 327 | |
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| 328 | //Generate the positron. Real particle in any case, because it will annihilate. If below |
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| 329 | //threshold, produce it at rest |
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[1055] | 330 | // VI: here there was a bug - positron and electron cuts are different |
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| 331 | if (positronKineEnergy < 0.0) |
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[968] | 332 | { |
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| 333 | localEnergyDeposit += positronKineEnergy; |
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| 334 | positronKineEnergy = 0; //produce it at rest |
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| 335 | } |
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| 336 | G4ThreeVector positronDirection(dirX_po,dirY_po,dirZ_po); |
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| 337 | positronDirection.rotateUz(photonDirection); |
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| 338 | G4DynamicParticle* positron = new G4DynamicParticle(G4Positron::Positron(), |
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| 339 | positronDirection, positronKineEnergy); |
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| 340 | fvect->push_back(positron); |
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| 341 | |
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[1055] | 342 | //Add rest of energy to the local energy deposit |
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[968] | 343 | fParticleChange->ProposeLocalEnergyDeposit(localEnergyDeposit); |
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| 344 | |
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[1055] | 345 | if (verboseLevel > 1) |
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[968] | 346 | { |
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| 347 | G4cout << "-----------------------------------------------------------" << G4endl; |
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| 348 | G4cout << "Energy balance from G4PenelopeGammaConversion" << G4endl; |
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| 349 | G4cout << "Incoming photon energy: " << photonEnergy/keV << " keV" << G4endl; |
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| 350 | G4cout << "-----------------------------------------------------------" << G4endl; |
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| 351 | if (electronKineEnergy) |
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[1055] | 352 | G4cout << "Electron (explicitely produced) " << electronKineEnergy/keV << " keV" |
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| 353 | << G4endl; |
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[968] | 354 | if (positronKineEnergy) |
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| 355 | G4cout << "Positron (not at rest) " << positronKineEnergy/keV << " keV" << G4endl; |
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| 356 | G4cout << "Rest masses of e+/- " << 2.0*electron_mass_c2/keV << " keV" << G4endl; |
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| 357 | if (localEnergyDeposit) |
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| 358 | G4cout << "Local energy deposit " << localEnergyDeposit/keV << " keV" << G4endl; |
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| 359 | G4cout << "Total final state: " << (electronKineEnergy+positronKineEnergy+ |
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| 360 | localEnergyDeposit+2.0*electron_mass_c2)/keV << |
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| 361 | " keV" << G4endl; |
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| 362 | G4cout << "-----------------------------------------------------------" << G4endl; |
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| 363 | } |
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| 364 | if (verboseLevel > 0) |
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| 365 | { |
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| 366 | G4double energyDiff = std::fabs(electronKineEnergy+positronKineEnergy+ |
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| 367 | localEnergyDeposit+2.0*electron_mass_c2-photonEnergy); |
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| 368 | if (energyDiff > 0.05*keV) |
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[1055] | 369 | G4cout << "Warning from G4PenelopeGammaConversion: problem with energy conservation: " |
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| 370 | << (electronKineEnergy+positronKineEnergy+ |
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| 371 | localEnergyDeposit+2.0*electron_mass_c2)/keV |
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| 372 | << " keV (final) vs. " << photonEnergy/keV << " keV (initial)" << G4endl; |
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| 373 | } |
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[968] | 374 | } |
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| 375 | |
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| 376 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 377 | |
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| 378 | std::vector<G4double> G4PenelopeGammaConversionModel::ScreenFunction(G4double b) |
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| 379 | { |
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| 380 | std::vector<G4double> result; |
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| 381 | result.clear(); |
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| 382 | G4double bsquare=b*b; |
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| 383 | G4double a0,f1,f2; |
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| 384 | f1=2.0-2*std::log(1+bsquare); |
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| 385 | f2=f1-(2.0/3.0); |
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| 386 | if (b < 1.0e-10) |
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| 387 | { |
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| 388 | f1=f1-twopi*b; |
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| 389 | } |
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| 390 | else |
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| 391 | { |
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| 392 | a0 = 4*b*std::atan(1.0/b); |
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| 393 | f1 = f1 - a0; |
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| 394 | f2 = f2+2*bsquare*(4.0-a0-3*std::log((1+bsquare)/bsquare)); |
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| 395 | } |
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| 396 | result.push_back(0.5*(3*f1-f2)); |
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| 397 | result.push_back(0.25*(3*f1+f2)); |
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| 398 | return result; |
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| 399 | } |
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| 400 | |
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| 401 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 402 | |
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| 403 | G4double G4PenelopeGammaConversionModel::GetScreeningRadius(G4double Z) |
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| 404 | { |
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| 405 | G4double result = 0; |
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| 406 | G4bool foundElement = false; |
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| 407 | G4int iZ = (G4int) Z; |
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| 408 | if (!fTheScreeningRadii) |
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| 409 | fTheScreeningRadii = new std::map<G4int,G4double>; |
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| 410 | |
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| 411 | if (fTheScreeningRadii->count(iZ)) |
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| 412 | { |
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| 413 | //The element is already loaded: just return it |
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| 414 | result = fTheScreeningRadii->find(iZ)->second; |
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| 415 | return result; |
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| 416 | } |
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| 417 | else //retrieve all from file |
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| 418 | { |
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| 419 | char* path = getenv("G4LEDATA"); |
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| 420 | if (!path) |
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| 421 | { |
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| 422 | G4String excep = "G4PenelopeGammaConversionModel - G4LEDATA environment variable not set!"; |
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| 423 | G4Exception(excep); |
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[1347] | 424 | return result; |
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[968] | 425 | } |
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| 426 | G4String pathString(path); |
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| 427 | G4String pathFile = pathString + "/penelope/pp-pen.dat"; |
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| 428 | std::ifstream file(pathFile); |
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| 429 | |
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| 430 | if (!(file.is_open())) |
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| 431 | { |
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| 432 | G4String excep = "G4PenelopeGammaConversionModel - data file " + pathFile + "not found!"; |
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| 433 | G4Exception(excep); |
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| 434 | } |
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| 435 | G4int k; |
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| 436 | G4double a1,a2; |
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| 437 | while(!file.eof()) { |
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| 438 | file >> k >> a1 >> a2; |
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| 439 | fTheScreeningRadii->insert(std::make_pair(k,a1)); |
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| 440 | if ((G4double) k == Z) |
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| 441 | { |
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| 442 | result = a1; |
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| 443 | foundElement = true; |
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| 444 | } |
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| 445 | } |
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| 446 | file.close(); |
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| 447 | if (verboseLevel > 2) |
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| 448 | G4cout << "Read file pp-pen.dat" << G4endl; |
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| 449 | if (foundElement) |
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| 450 | return result; |
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| 451 | else |
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| 452 | { |
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| 453 | G4String excep = "G4PenelopeGammaConversionModel - Screening Radius for not found in the data file"; |
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| 454 | G4Exception(excep); |
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| 455 | return 0; |
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| 456 | } |
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| 457 | } |
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| 458 | } |
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| 459 | |
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| 460 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 461 | |
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| 462 | G4double G4PenelopeGammaConversionModel::CoulombCorrection(G4double a) |
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| 463 | { |
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| 464 | G4double fc=0; |
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| 465 | G4double b[7] = {0.202059,-0.03693,0.00835,-0.00201,0.00049,-0.00012,0.00003}; |
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| 466 | G4double aSquared = a*a; |
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| 467 | G4double aFourth = aSquared*aSquared; |
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| 468 | G4double aEighth = aFourth*aFourth; |
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| 469 | |
---|
| 470 | fc = ((1.0/(1.0+a*a))+b[0]+b[1]*aSquared+b[2]*aFourth+b[3]*(aSquared*aFourth)+ |
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| 471 | b[4]*aEighth+b[5]*(aEighth*aSquared)+b[6]*(aEighth*aFourth)); |
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| 472 | fc=aSquared*fc; |
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| 473 | return fc; |
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| 474 | } |
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| 475 | |
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| 476 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 477 | |
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| 478 | G4double G4PenelopeGammaConversionModel::LowEnergyCorrection(G4double a,G4double eki) |
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| 479 | { |
---|
| 480 | G4double f0=0,t=0; |
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| 481 | G4double b[12] = {-1.744,-12.10,11.18,8.523,73.26,-41.41,-13.52,-121.1,94.41,8.946,62.05,-63.41}; |
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| 482 | t=std::sqrt(2.0*eki); |
---|
| 483 | G4double tSq = t*t; |
---|
| 484 | f0=(b[0]+b[1]*a+b[2]*a*a)*t+(b[3]+b[4]*a+b[5]*a*a)*(tSq)+(b[6]+b[7]*a+b[8]*a*a)*(tSq*t)+ |
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| 485 | (b[9]+b[10]*a+b[11]*a*a)*(tSq*tSq); |
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| 486 | return f0; |
---|
| 487 | |
---|
| 488 | } |
---|