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 | // --------------------------------------------------------------------------- |
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27 | // |
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28 | // GEANT4 Class file |
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29 | // |
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30 | // |
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31 | // File name: G4hShellCrossSection |
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32 | // |
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33 | // Author: S. Dussoni and A. Mantero (Alfonso.Mantero@ge.infn.it) |
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34 | // |
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35 | // History: |
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36 | // ----------- |
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37 | // 23 Oct 2001 A. Mantero 1st implementation |
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38 | // 24 Oct 2001 MGP Cleaned up |
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39 | // 30 Oct 2001 V.Ivanchenko Include formula (53) |
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40 | // 07 Oct 2002 V.Ivanchenko Fix in formula (53) |
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41 | // 22 Apr 2004 S.Saliceti Add testFlag variable and GetCrossSection method |
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42 | // ---------------------------------------------------------------------------- |
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43 | |
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44 | #include "globals.hh" |
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45 | #include "G4hShellCrossSection.hh" |
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46 | #include "G4AtomicTransitionManager.hh" |
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47 | #include "G4Electron.hh" |
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48 | #include "G4Proton.hh" |
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49 | #include "G4ParticleDefinition.hh" |
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50 | |
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51 | G4hShellCrossSection::G4hShellCrossSection() |
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52 | { } |
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53 | |
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54 | |
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55 | G4hShellCrossSection::~G4hShellCrossSection() |
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56 | { } |
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57 | |
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58 | |
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59 | |
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60 | std::vector<G4double> G4hShellCrossSection::GetCrossSection(G4int Z, |
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61 | G4double incidentEnergy, |
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62 | G4double mass, |
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63 | G4double deltaEnergy, |
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64 | G4bool) const |
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65 | { |
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66 | return CalculateCrossSections(Z,incidentEnergy,mass,deltaEnergy,false); |
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67 | } |
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68 | |
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69 | |
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70 | std::vector<G4double> G4hShellCrossSection::CalculateCrossSections(G4int Z, |
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71 | G4double incidentEnergy, |
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72 | G4double hMass, |
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73 | G4double deltaEnergy, |
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74 | G4bool testFlag) const |
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75 | { |
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76 | // Cross-sections for proton ionization calculated as in |
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77 | // "M. Gryzinski, Two-Particle Collisions. I. General Relations for |
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78 | // Collisions in the Laboratory system, Phys.Rev. 138 A305" |
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79 | // Other reference papers are Gryzinski's "Paper I" and "Paper II" |
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80 | // V.Ivanchenko add only implementation of the formula (53) |
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81 | // last factor neglected because it is 1 with a good accuracy |
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82 | |
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83 | const G4AtomicTransitionManager* transitionManager = |
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84 | G4AtomicTransitionManager::Instance(); |
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85 | |
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86 | size_t nShells = transitionManager->NumberOfShells(Z); |
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87 | |
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88 | // Vector that stores the calculated cross-sections for each shell: |
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89 | std::vector<G4double> crossSections; |
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90 | |
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91 | // In this loop we calculate cross-section for every shell in the atom |
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92 | for (size_t k=0; k<nShells; k++) |
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93 | { |
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94 | G4double bindingEnergy = transitionManager->Shell(Z,k)->BindingEnergy(); |
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95 | G4double xEnergy = 0.5*bindingEnergy; |
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96 | G4double y = incidentEnergy*electron_mass_c2/(xEnergy*hMass); |
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97 | G4double dele = deltaEnergy + xEnergy; |
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98 | G4double x = electron_mass_c2/dele; |
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99 | |
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100 | G4double aCrossSection = (dele/(xEnergy*(1. + 1./y)) |
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101 | + 4.*std::log(2.7 + std::sqrt(y))/3.) * x*x*x; |
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102 | |
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103 | // Fill the vector of cross sections with the value just calculated |
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104 | crossSections.push_back(aCrossSection); |
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105 | |
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106 | if (testFlag) |
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107 | { |
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108 | G4cout <<"Element: " <<Z<<" Shell: "<<k<<" Particle Energy(MeV): "<<incidentEnergy/MeV<<G4endl; |
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109 | G4cout <<"Delta Ray Energy(MeV): "<< deltaEnergy/MeV<<" Binding Energy(MeV): "<<bindingEnergy/MeV<<G4endl; |
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110 | G4cout <<"Cross Section: "<<aCrossSection/barn<<" barns"<< G4endl; |
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111 | } |
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112 | } |
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113 | |
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114 | return crossSections; |
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115 | } |
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116 | |
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117 | |
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118 | |
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119 | // Normalization of relative cross-sections to 1 |
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120 | |
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121 | std::vector<G4double> G4hShellCrossSection::Probabilities( |
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122 | G4int Z, |
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123 | G4double incidentEnergy, |
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124 | G4double hMass, |
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125 | G4double deltaEnergy |
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126 | ) const |
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127 | { |
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128 | std::vector<G4double> crossSection = CalculateCrossSections(Z, incidentEnergy, hMass, deltaEnergy,true); |
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129 | G4double nShells = crossSection.size(); |
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130 | |
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131 | // Partial and total cross-section used for normalization of crossSections: |
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132 | G4double totalCrossSection = 0.; |
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133 | |
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134 | // Calculation of total cross-section |
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135 | for (size_t j=0; j<nShells; j++) |
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136 | { |
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137 | totalCrossSection += crossSection[j]; // equivalent to totalCrossSection = totalCrossSection + aCrossSection |
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138 | } |
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139 | |
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140 | // Calculation of normal cross section |
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141 | for(size_t i=0; i<nShells; i++) |
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142 | { |
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143 | crossSection[i] = crossSection[i] / totalCrossSection; |
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144 | } |
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145 | // Returns the normalized vector |
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146 | return crossSection; |
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147 | } |
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148 | |
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149 | |
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150 | |
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