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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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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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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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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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