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 | // $Id: G4GammaConversion.cc,v 1.31 2009/02/20 12:06:37 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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28 | // |
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29 | // |
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30 | //------------------ G4GammaConversion physics process ------------------------- |
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31 | // by Michel Maire, 24 May 1996 |
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32 | // |
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33 | // 11-06-96 Added SelectRandomAtom() method, M.Maire |
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34 | // 21-06-96 SetCuts implementation, M.Maire |
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35 | // 24-06-96 simplification in ComputeCrossSectionPerAtom, M.Maire |
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36 | // 24-06-96 in DoIt : change the particleType stuff, M.Maire |
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37 | // 25-06-96 modification in the generation of the teta angle, M.Maire |
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38 | // 16-09-96 minors optimisations in DoIt. Thanks to P.Urban |
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39 | // dynamical array PartialSumSigma |
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40 | // 13-12-96 fast sampling of epsil below 2 MeV, L.Urban |
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41 | // 14-01-97 crossection table + meanfreepath table. |
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42 | // PartialSumSigma removed, M.Maire |
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43 | // 14-01-97 in DoIt the positron is always created, even with Ekine=0, |
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44 | // for further annihilation, M.Maire |
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45 | // 14-03-97 new Physics scheme for geant4alpha, M.Maire |
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46 | // 28-03-97 protection in BuildPhysicsTable, M.Maire |
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47 | // 19-06-97 correction in ComputeCrossSectionPerAtom, L.Urban |
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48 | // 04-06-98 in DoIt, secondary production condition: |
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49 | // range>std::min(threshold,safety) |
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50 | // 13-08-98 new methods SetBining() PrintInfo() |
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51 | // 28-05-01 V.Ivanchenko minor changes to provide ANSI -wall compilation |
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52 | // 11-07-01 PostStepDoIt - sampling epsil: power(rndm,0.333333) |
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53 | // 13-07-01 DoIt: suppression of production cut for the (e-,e+) (mma) |
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54 | // 06-08-01 new methods Store/Retrieve PhysicsTable (mma) |
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55 | // 06-08-01 BuildThePhysicsTable() called from constructor (mma) |
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56 | // 17-09-01 migration of Materials to pure STL (mma) |
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57 | // 20-09-01 DoIt: fminimalEnergy = 1*eV (mma) |
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58 | // 01-10-01 come back to BuildPhysicsTable(const G4ParticleDefinition&) |
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59 | // 11-01-02 ComputeCrossSection: correction of extrapolation below EnergyLimit |
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60 | // 21-03-02 DoIt: correction of the e+e- angular distribution (bug 363) mma |
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61 | // 08-11-04 Remove of Store/Retrieve tables (V.Ivantchenko) |
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62 | // 19-04-05 Migrate to model interface and inherit |
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63 | // from G4VEmProcess (V.Ivanchenko) |
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64 | // 04-05-05, Make class to be default (V.Ivanchenko) |
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65 | // 09-08-06, add SetModel(G4VEmModel*) (mma) |
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66 | // 12-09-06, move SetModel(G4VEmModel*) in G4VEmProcess (mma) |
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67 | // ----------------------------------------------------------------------------- |
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68 | |
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69 | #include "G4GammaConversion.hh" |
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70 | #include "G4BetheHeitlerModel.hh" |
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71 | #include "G4Electron.hh" |
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72 | |
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73 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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74 | |
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75 | using namespace std; |
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76 | |
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77 | G4GammaConversion::G4GammaConversion(const G4String& processName, |
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78 | G4ProcessType type):G4VEmProcess (processName, type), |
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79 | isInitialised(false) |
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80 | { |
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81 | SetMinKinEnergy(2.0*electron_mass_c2); |
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82 | SetProcessSubType(fGammaConversion); |
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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 | G4GammaConversion::~G4GammaConversion() |
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88 | {} |
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89 | |
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90 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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91 | |
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92 | G4bool G4GammaConversion::IsApplicable(const G4ParticleDefinition& p) |
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93 | { |
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94 | return (&p == G4Gamma::Gamma()); |
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95 | } |
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96 | |
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97 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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98 | |
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99 | void G4GammaConversion::InitialiseProcess(const G4ParticleDefinition*) |
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100 | { |
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101 | if(!isInitialised) { |
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102 | isInitialised = true; |
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103 | SetBuildTableFlag(true); |
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104 | SetSecondaryParticle(G4Electron::Electron()); |
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105 | G4double emin = std::max(MinKinEnergy(), 2.0*electron_mass_c2); |
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106 | SetMinKinEnergy(emin); |
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107 | if(!Model()) SetModel(new G4BetheHeitlerModel()); |
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108 | Model()->SetLowEnergyLimit(emin); |
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109 | Model()->SetHighEnergyLimit(MaxKinEnergy()); |
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110 | AddEmModel(1, Model()); |
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111 | } |
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112 | } |
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113 | |
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114 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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115 | |
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116 | void G4GammaConversion::PrintInfo() |
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117 | {} |
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118 | |
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119 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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