[819] | 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 | // |
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| 29 | // GEANT4 Class file |
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| 30 | // |
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| 31 | // |
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| 32 | // File name: G4IonYangFluctuationModel |
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| 33 | // |
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| 34 | // Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch) |
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| 35 | // |
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| 36 | // Creation date: 18 August 2000 |
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| 37 | // |
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| 38 | // Modifications: |
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| 39 | // 18/08/2000 V.Ivanchenko First implementation |
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| 40 | // 04/09/2000 V.Ivanchenko Rename fluctuations |
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| 41 | // 03/10/2000 V.Ivanchenko CodeWizard clean up |
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| 42 | // 10/05/2001 V.Ivanchenko Clean up againist Linux compilation with -Wall |
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| 43 | // |
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| 44 | // ------------------------------------------------------------------- |
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| 45 | // Class Description: |
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| 46 | // |
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| 47 | // The aproximation of additional ion energy loss fluctuations |
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| 48 | // Q.Yang et al., NIM B61(1991)149-155. |
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| 49 | // |
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| 50 | // Class Description: End |
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| 51 | // |
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| 52 | // ------------------------------------------------------------------- |
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| 53 | // |
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| 54 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 55 | |
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| 56 | #include "G4IonYangFluctuationModel.hh" |
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| 57 | #include "G4DynamicParticle.hh" |
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| 58 | #include "G4ParticleDefinition.hh" |
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| 59 | #include "G4Material.hh" |
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| 60 | #include "globals.hh" |
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| 61 | |
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| 62 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 63 | |
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| 64 | G4IonYangFluctuationModel::G4IonYangFluctuationModel(const G4String& name) |
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| 65 | : G4VLowEnergyModel(name) |
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| 66 | {;} |
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| 67 | |
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| 68 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 69 | |
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| 70 | G4IonYangFluctuationModel::~G4IonYangFluctuationModel() |
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| 71 | {;} |
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| 72 | |
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| 73 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 74 | |
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| 75 | G4double G4IonYangFluctuationModel::TheValue(const G4DynamicParticle* particle, |
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| 76 | const G4Material* material) |
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| 77 | { |
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| 78 | G4double energy = particle->GetKineticEnergy() ; |
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| 79 | G4double mass = particle->GetMass() ; |
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| 80 | G4double charge = (particle->GetCharge())/eplus ; |
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| 81 | |
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| 82 | G4double q = YangFluctuationModel(material,energy,mass,charge) ; |
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| 83 | |
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| 84 | return q ; |
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| 85 | } |
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| 86 | |
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| 87 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 88 | |
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| 89 | G4double G4IonYangFluctuationModel::TheValue(const G4ParticleDefinition* aParticle, |
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| 90 | const G4Material* material, |
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| 91 | G4double kineticEnergy) |
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| 92 | { |
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| 93 | G4double mass = aParticle->GetPDGMass() ; |
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| 94 | G4double charge = (aParticle->GetPDGCharge())/eplus ; |
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| 95 | |
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| 96 | G4double q = YangFluctuationModel(material,kineticEnergy,mass,charge); |
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| 97 | |
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| 98 | return q ; |
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| 99 | } |
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| 100 | |
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| 101 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 102 | |
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| 103 | G4double G4IonYangFluctuationModel::HighEnergyLimit(const G4ParticleDefinition*, |
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| 104 | const G4Material*) const |
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| 105 | { |
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| 106 | return 1.0*TeV ; |
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| 107 | } |
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| 108 | |
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| 109 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 110 | |
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| 111 | G4double G4IonYangFluctuationModel::LowEnergyLimit(const G4ParticleDefinition* , |
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| 112 | const G4Material* ) const |
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| 113 | { |
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| 114 | return 0.0 ; |
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| 115 | } |
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| 116 | |
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| 117 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 118 | |
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| 119 | G4double G4IonYangFluctuationModel::HighEnergyLimit(const G4ParticleDefinition* ) const |
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| 120 | { |
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| 121 | return 1.0*TeV ; |
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| 122 | } |
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| 123 | |
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| 124 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 125 | |
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| 126 | G4double G4IonYangFluctuationModel::LowEnergyLimit( |
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| 127 | const G4ParticleDefinition* ) const |
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| 128 | { |
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| 129 | return 0.0 ; |
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| 130 | } |
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| 131 | |
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| 132 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 133 | |
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| 134 | G4bool G4IonYangFluctuationModel::IsInCharge(const G4DynamicParticle*, |
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| 135 | const G4Material* ) const |
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| 136 | { |
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| 137 | return true ; |
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| 138 | } |
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| 139 | |
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| 140 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 141 | |
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| 142 | G4bool G4IonYangFluctuationModel::IsInCharge(const G4ParticleDefinition* , |
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| 143 | const G4Material* ) const |
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| 144 | { |
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| 145 | return true ; |
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| 146 | } |
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| 147 | |
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| 148 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 149 | |
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| 150 | G4double G4IonYangFluctuationModel::YangFluctuationModel(const G4Material* material, |
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| 151 | G4double kineticEnergy, |
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| 152 | G4double particleMass, |
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| 153 | G4double charge) const |
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| 154 | { |
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| 155 | // The aproximation of energy loss fluctuations |
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| 156 | // Q.Yang et al., NIM B61(1991)149-155. |
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| 157 | |
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| 158 | // Reduced energy in MeV/AMU |
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| 159 | G4double energy = kineticEnergy *amu_c2/(particleMass*MeV) ; |
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| 160 | |
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| 161 | G4int i = 0 ; |
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| 162 | G4double factor = 1.0 ; |
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| 163 | |
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| 164 | // The index of set of parameters i = 0 for protons(hadrons) in gases |
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| 165 | // 1 for protons(hadrons) in solids |
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| 166 | // 2 for ions in atomic gases |
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| 167 | // 3 for ions in molecular gases |
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| 168 | // 4 for ions in solids |
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| 169 | static G4double b[5][4] = { |
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| 170 | {0.1014, 0.3700, 0.9642, 3.987}, |
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| 171 | {0.1955, 0.6941, 2.522, 1.040}, |
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| 172 | {0.05058, 0.08975, 0.1419, 10.80}, |
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| 173 | {0.05009, 0.08660, 0.2751, 3.787}, |
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| 174 | {0.01273, 0.03458, 0.3951, 3.812} |
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| 175 | } ; |
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| 176 | |
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| 177 | // protons (hadrons) |
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| 178 | if(1.5 > charge) { |
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| 179 | if( kStateGas != material->GetState() ) i = 1 ; |
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| 180 | |
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| 181 | // ions |
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| 182 | } else { |
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| 183 | G4double zeff = (material->GetElectronDensity())/ |
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| 184 | (material->GetTotNbOfAtomsPerVolume()) ; |
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| 185 | factor = charge * std::pow(charge/zeff, 0.3333) ; |
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| 186 | |
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| 187 | if( kStateGas == material->GetState() ) { |
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| 188 | energy /= (charge * std::sqrt(charge)) ; |
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| 189 | |
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| 190 | if(1 == (material->GetNumberOfElements())) { |
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| 191 | i = 2 ; |
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| 192 | } else { |
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| 193 | i = 3 ; |
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| 194 | } |
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| 195 | |
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| 196 | } else { |
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| 197 | energy /= (charge * std::sqrt(charge*zeff)) ; |
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| 198 | i = 4 ; |
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| 199 | } |
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| 200 | } |
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| 201 | |
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| 202 | G4double x = b[i][2] * (1.0 - std::exp( - energy * b[i][3] )) ; |
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| 203 | |
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| 204 | G4double q = factor * x * b[i][0] / |
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| 205 | ((energy - b[i][1])*(energy - b[i][1]) + x*x) ; |
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| 206 | |
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| 207 | return q ; |
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| 208 | } |
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| 209 | |
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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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