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: G4CrossSectionChargeTransferCH.cc,v 1.4 2009/06/10 13:32:36 mantero Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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29 | // |
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30 | // Contact Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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31 | // |
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32 | // Reference: TNS Geant4-DNA paper |
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33 | // Reference for implementation model: NIM. 155, pp. 145-156, 1978 |
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34 | |
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35 | // History: |
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36 | // ----------- |
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37 | // Date Name Modification |
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38 | // 28 Dec 2007 M.G. Pia Created |
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39 | // |
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40 | // ------------------------------------------------------------------- |
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41 | |
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42 | // Class description: |
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43 | // Total cross section for incident p charge transfer in hydrocarbons |
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44 | // Reference: K. Janev, J. G. Wang and T. Kato, NIFS-DATA (2001) |
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45 | // http://www-cfadc.phy.ornl.gov/astro/ps/data/ |
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46 | // http://www-pub.iaea.org/MTCD/publications/PDF/APID-VOL10.pdf |
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47 | // |
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48 | // The fit formula is: |
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49 | // ln(cross section)=\sum C_i T_i(x) |
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50 | // x=[2ln(E)-ln(E_min)-ln(E_max)]/[ln(E_max)-ln(E_min)] |
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51 | // T_1(x)=1 |
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52 | // T_2(x)=x |
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53 | // T_n+2(x)=2T_n+1(x)-T_n(x) |
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54 | // |
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55 | // Where cross section is given in 10^-16 cm2 and E is in keV, |
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56 | // E_min=1e-4 keV and E_max=1.e3 keV. |
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57 | |
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58 | // Further documentation available from http://www.ge.infn.it/geant4/ |
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59 | |
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60 | // ------------------------------------------------------------------- |
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61 | |
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62 | |
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63 | #include "G4CrossSectionChargeTransferCH.hh" |
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64 | #include "G4Track.hh" |
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65 | #include "G4DynamicParticle.hh" |
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66 | #include "G4Proton.hh" |
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67 | |
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68 | G4CrossSectionChargeTransferCH::G4CrossSectionChargeTransferCH() |
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69 | { |
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70 | // Default energy limits (defined for protection against anomalous behaviour only) |
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71 | name = "ChargeTransferCH"; |
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72 | lowEnergyLimit = 0.1 * eV; |
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73 | highEnergyLimit = 1.0 * MeV; |
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74 | |
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75 | std::vector<G4double> coeff; |
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76 | G4String materialName; |
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77 | |
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78 | // CH |
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79 | materialName = "CH"; |
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80 | coeff.push_back(-1.060468); |
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81 | coeff.push_back(-5.662572); |
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82 | coeff.push_back(-4.376450); |
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83 | coeff.push_back(-3.567226); |
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84 | coeff.push_back(-1.433069); |
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85 | coeff.push_back(-0.5789399); |
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86 | coeff.push_back(-0.3523295); |
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87 | coeff.push_back(-0.09956988); |
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88 | coeff.push_back(0.01532751); |
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89 | crossMap[materialName] = coeff; |
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90 | coeff.clear(); |
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91 | |
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92 | // CH2 |
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93 | materialName = "CH2"; |
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94 | coeff.push_back(1.118652E-01); |
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95 | coeff.push_back(-5.216803E+00); |
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96 | coeff.push_back(-3.893841E+00); |
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97 | coeff.push_back(-2.756865E+00); |
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98 | coeff.push_back(-1.192043E+00); |
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99 | coeff.push_back(-5.200059E-01); |
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100 | coeff.push_back(-1.816781E-01); |
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101 | coeff.push_back(1.129866E-02); |
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102 | coeff.push_back(-3.658702E-03); |
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103 | crossMap[materialName] = coeff; |
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104 | coeff.clear(); |
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105 | |
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106 | // CH3 |
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107 | coeff.push_back(6.854778E-01); |
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108 | coeff.push_back(-5.810741E+00); |
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109 | coeff.push_back(-3.622136E+00); |
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110 | coeff.push_back(-2.179920E+00); |
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111 | coeff.push_back(-7.801006E-01); |
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112 | coeff.push_back(-2.421371E-02); |
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113 | coeff.push_back(2.762333E-01); |
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114 | coeff.push_back(2.288237E-01); |
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115 | coeff.push_back(6.164797E-02); |
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116 | crossMap[materialName] = coeff; |
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117 | coeff.clear(); |
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118 | |
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119 | // CH4 |
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120 | materialName = "CH4"; |
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121 | coeff.push_back(0.3901564); |
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122 | coeff.push_back(-6.426675); |
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123 | coeff.push_back(-3.706893); |
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124 | coeff.push_back(-1.999034); |
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125 | coeff.push_back(-0.5625439); |
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126 | coeff.push_back(0.2279431); |
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127 | coeff.push_back(0.3443980); |
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128 | coeff.push_back(0.1566892); |
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129 | coeff.push_back(-0.05398410); |
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130 | coeff.push_back(-0.1822252); |
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131 | coeff.push_back(-0.1593352); |
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132 | coeff.push_back(-0.08826322); |
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133 | crossMap[materialName] = coeff; |
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134 | coeff.clear(); |
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135 | |
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136 | // C2H |
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137 | materialName = "C2H"; |
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138 | coeff.push_back(-1.986507E+00); |
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139 | coeff.push_back(-5.720283E+00); |
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140 | coeff.push_back(-3.535139E+00); |
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141 | coeff.push_back(-4.230273E+00); |
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142 | coeff.push_back(-1.254502E+00); |
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143 | coeff.push_back(-2.056898E-01); |
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144 | coeff.push_back(-4.595756E-01); |
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145 | coeff.push_back(-7.842824E-02); |
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146 | coeff.push_back(3.002537E-02); |
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147 | coeff.push_back(-5.626713E-02); |
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148 | coeff.push_back(6.455583E-02); |
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149 | crossMap[materialName] = coeff; |
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150 | coeff.clear(); |
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151 | |
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152 | // C2H2 |
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153 | materialName = "C2H2"; |
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154 | coeff.push_back(2.513870E-01); |
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155 | coeff.push_back(-5.812705E+00); |
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156 | coeff.push_back(-3.338185E+00); |
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157 | coeff.push_back(-3.071630E+00); |
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158 | coeff.push_back(-1.433263E+00); |
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159 | coeff.push_back(-3.583544E-01); |
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160 | coeff.push_back(-1.456216E-01); |
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161 | coeff.push_back(-7.391778E-03); |
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162 | coeff.push_back(1.151712E-02); |
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163 | crossMap[materialName] = coeff; |
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164 | coeff.clear(); |
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165 | // |
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166 | |
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167 | } |
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168 | |
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169 | |
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170 | G4CrossSectionChargeTransferCH::~G4CrossSectionChargeTransferCH() |
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171 | { } |
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172 | |
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173 | |
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174 | G4double G4CrossSectionChargeTransferCH::CrossSection(const G4Track& track) |
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175 | { |
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176 | G4double sigma = DBL_MIN; |
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177 | |
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178 | const G4DynamicParticle* particle = track.GetDynamicParticle(); |
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179 | G4double e = particle->GetKineticEnergy() / keV; |
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180 | |
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181 | // Get the material the track is in |
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182 | G4Material* material = track.GetMaterial(); |
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183 | G4String materialName; |
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184 | materialName = material->GetName(); |
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185 | |
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186 | // Check whether cross section data are available for the current material |
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187 | |
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188 | std::map<G4String,std::vector<G4double>,std::less<G4String> >::const_iterator pos; |
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189 | pos = crossMap.find(materialName); |
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190 | if (pos!= crossMap.end()) |
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191 | { |
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192 | std::vector<G4double> coeff = (*pos).second; |
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193 | G4double eMin = lowEnergyLimit / keV; |
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194 | G4double eMax = highEnergyLimit / keV; |
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195 | G4double scaleFactor = 1.e-16 * cm2; |
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196 | |
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197 | if (e >= eMin && e <= eMax) |
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198 | { |
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199 | G4double x = (2.*std::log(e) - std::log(eMin) - std::log(eMax)) / (std::log(eMax) - std::log(eMin)); |
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200 | |
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201 | std::vector<G4double> t; |
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202 | t.push_back(1.); |
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203 | t.push_back(x); |
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204 | G4double cross = t[0] * coeff[0] + t[1] * coeff[1]; |
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205 | |
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206 | G4int nCoeff = coeff.size(); |
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207 | for (G4int i=2; i<nCoeff; i++) |
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208 | { |
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209 | G4double tNext = 2. * t[i-1] - t[i-2]; |
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210 | t.push_back(tNext); |
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211 | cross = cross + coeff[i] * tNext; |
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212 | } |
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213 | sigma = std::exp(cross) * scaleFactor; |
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214 | } |
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215 | } |
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216 | |
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217 | return sigma; |
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218 | } |
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219 | |
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