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 | // $Id: G4eCrossSectionExcitationEmfietzoglou.cc,v 1.1 2007/05/04 10:16:06 pia Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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29 | // |
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30 | |
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31 | // $Id: G4eCrossSectionExcitationEmfietzoglou.cc,v 1.1 2007/05/04 10:16:06 pia Exp $ |
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32 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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33 | // |
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34 | // Contact Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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35 | // |
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36 | // Reference: TNS Geant4-DNA paper |
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37 | // Reference for implementation model: NIM. 155, pp. 145-156, 1978 |
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38 | |
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39 | // History: |
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40 | // ----------- |
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41 | // Date Name Modification |
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42 | // 28 Apr 2007 M.G. Pia Created in compliance with design described in TNS paper |
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43 | // |
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44 | // ------------------------------------------------------------------- |
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45 | |
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46 | // Class description: |
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47 | // Geant4-DNA Cross total cross section for electron elastic scattering in water |
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48 | // Further documentation available from http://www.ge.infn.it/geant4/dna |
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49 | |
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50 | // ------------------------------------------------------------------- |
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51 | |
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52 | |
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53 | #include "G4eCrossSectionExcitationEmfietzoglou.hh" |
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54 | #include "G4Track.hh" |
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55 | #include "G4DynamicParticle.hh" |
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56 | |
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57 | #include "G4ParticleDefinition.hh" |
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58 | #include "G4Track.hh" |
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59 | #include "G4Electron.hh" |
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60 | #include "G4DynamicParticle.hh" |
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61 | #include "G4Material.hh" |
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62 | |
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63 | #include "Randomize.hh" |
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64 | |
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65 | G4eCrossSectionExcitationEmfietzoglou::G4eCrossSectionExcitationEmfietzoglou() |
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66 | { |
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67 | |
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68 | name = "eCrossSectionExcitationEmfietzoglou"; |
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69 | lowEnergyLimit = 7. * eV; |
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70 | highEnergyLimit = 10 * keV; |
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71 | |
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72 | // if (verboseLevel > 0) |
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73 | // { |
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74 | // G4cout << name << " is created " << G4endl |
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75 | // << "Energy range: " |
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76 | // << lowEnergyLimit / keV << " keV - " |
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77 | // << highEnergyLimit / GeV << " GeV" |
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78 | // << G4endl; |
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79 | // } |
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80 | } |
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81 | |
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82 | |
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83 | G4eCrossSectionExcitationEmfietzoglou::~G4eCrossSectionExcitationEmfietzoglou() |
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84 | { } |
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85 | |
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86 | |
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87 | G4double G4eCrossSectionExcitationEmfietzoglou::CrossSection(const G4Track& track) |
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88 | { |
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89 | const G4DynamicParticle* particle = track.GetDynamicParticle(); |
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90 | G4double k = particle->GetKineticEnergy(); |
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91 | |
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92 | // G4Material* material = track.GetMaterial(); |
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93 | |
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94 | // Assume that the material is water; proper algorithm to calculate correctly for any material to be inserted here |
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95 | |
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96 | // Take into account 5 excitation levels (D. Emfietzoglou et al., NIM B 193, pp. 71-78, 2002. |
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97 | G4int i = 5; |
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98 | |
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99 | G4double crossSection(0.); |
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100 | |
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101 | while (i>0) |
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102 | { |
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103 | i--; |
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104 | crossSection += PartialCrossSection(k,i); |
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105 | } |
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106 | return crossSection; |
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107 | } |
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108 | |
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109 | |
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110 | G4double G4eCrossSectionExcitationEmfietzoglou::PartialCrossSection(G4double k, G4int excitationLevel) |
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111 | { |
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112 | // Aj T |
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113 | // sigma(T) = ------------- (Bj / T) ln(Cj ---) [1 - Bj / T]^Pj |
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114 | // 2 pi alpha0 R |
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115 | // |
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116 | // T is the incoming electron kinetic energy |
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117 | // alpha0 is the Bohr Radius (Bohr_radius) |
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118 | // Aj, Bj, Cj & Pj are parameters that can be found in Emfietzoglou's papers |
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119 | // |
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120 | // |
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121 | // From Phys. Med. Biol. 48 (2003) 2355-2371, D.Emfietzoglou, |
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122 | // Monte Carlo Simulation of the energy loss of low energy electrons in liquid Water |
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123 | |
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124 | k = k / eV; |
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125 | const G4double sigma0 = (10. / 3.343e22) * cm2; |
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126 | const G4double aj[] = {0.0205, 0.0209, 0.0130, 0.0026, 0.0025}; |
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127 | const G4double cj[] = {4.9801, 3.3850, 2.8095, 1.9242, 3.4624}; |
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128 | const G4double pj[] = {0.4757, 0.3483, 0.4443, 0.3429, 0.4379}; |
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129 | const G4double r = 13.6 * eV; |
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130 | |
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131 | G4double cross = 0.; |
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132 | if (k < EnergyConstant(excitationLevel)) return cross; |
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133 | |
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134 | G4double excitationSigma = ( aj[excitationLevel] / (2. * pi * Bohr_radius)) * |
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135 | (EnergyConstant(excitationLevel) / k) * |
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136 | std::log(cj[excitationLevel] * (k / r)) * |
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137 | std::pow((1. - (EnergyConstant(excitationLevel) / k)), pj[excitationLevel]); |
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138 | G4cout << "Bohr radius = " << Bohr_radius << G4endl; |
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139 | |
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140 | cross = excitationSigma * sigma0; |
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141 | |
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142 | return cross; |
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143 | } |
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144 | |
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145 | |
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146 | G4int G4eCrossSectionExcitationEmfietzoglou::RandomizePartialCrossSection(G4double k) |
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147 | { |
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148 | // Assume 5 excitation levels |
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149 | |
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150 | G4int i = 5; |
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151 | G4double value = 0.; |
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152 | G4double values[5]; |
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153 | |
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154 | while (i>0) |
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155 | { |
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156 | i--; |
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157 | values[i] = PartialCrossSection(k,i); |
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158 | value += values[i]; |
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159 | } |
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160 | |
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161 | value *= G4UniformRand(); |
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162 | |
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163 | i = 5; |
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164 | while (i>0) |
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165 | { |
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166 | i--; |
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167 | |
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168 | if (values[i] > value) return i; |
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169 | |
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170 | value -= values[i]; |
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171 | } |
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172 | // One should never end up here; next statement added to avoid compilation warning |
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173 | // Probably one should throw an exception if one ends up here |
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174 | return 0; |
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175 | } |
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176 | |
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177 | G4double G4eCrossSectionExcitationEmfietzoglou::EnergyConstant(G4int excitationLevel) |
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178 | { |
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179 | const G4double ej[] ={ 8.22*eV, 10.00*eV, 11.24*eV, 12.61*eV, 13.77*eV}; |
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180 | G4double e = ej[excitationLevel]; |
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181 | |
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182 | return e; |
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183 | } |
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184 | |
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185 | |
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186 | |
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187 | |
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188 | //G4bool G4eCrossSectionExcitationEmfietzoglou::IsApplicable(const G4ParticleDefinition& particle) |
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189 | //{ |
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190 | // return ( &particle == G4Electron::Electron() ); |
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191 | //} |
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192 | |
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