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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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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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 header file |
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30 | // |
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31 | // Class: G4IonDEDXScalingICRU73 |
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32 | // |
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33 | // Base class: G4VIonDEDXScalingAlgorithm |
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34 | // |
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35 | // Author: Anton Lechner (Anton.Lechner@cern.ch) |
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36 | // |
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37 | // First implementation: 10. 05. 2009 |
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38 | // |
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39 | // Modifications: 12. 11. 2009 - Moved all decision logic concerning ICRU 73 |
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40 | // scaling for heavy ions into this class. |
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41 | // Adapting ScalingFactorEnergy class according |
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42 | // to changes in base class (AL). |
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43 | // |
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44 | // Class description: |
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45 | // dE/dx scaling algorithm applied on top of ICRU 73 data (for ions not |
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46 | // covered by the ICRU 73 report) |
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47 | // |
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48 | // Comments: |
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49 | // |
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50 | // =========================================================================== |
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51 | |
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52 | #ifndef G4IONDEDXSCALINGICRU73_HH |
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53 | #define G4IONDEDXSCALINGICRU73_HH |
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54 | |
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55 | #include "globals.hh" |
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56 | #include "G4VIonDEDXScalingAlgorithm.hh" |
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57 | #include "G4Material.hh" |
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58 | #include "G4ParticleDefinition.hh" |
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59 | #include <vector> |
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60 | |
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61 | |
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62 | class G4IonDEDXScalingICRU73 : public G4VIonDEDXScalingAlgorithm { |
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63 | |
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64 | public: |
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65 | G4IonDEDXScalingICRU73(G4int minAtomicNumberIon = 19, |
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66 | G4int maxAtomicNumberIon = 102); |
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67 | ~G4IonDEDXScalingICRU73(); |
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68 | |
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69 | // Function for scaling the kinetic energy (no scaling by default). |
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70 | // Returns scaling factor for a given ion. |
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71 | G4double ScalingFactorEnergy( |
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72 | const G4ParticleDefinition* particle, // Projectile (ion) |
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73 | const G4Material* material); // Target material |
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74 | |
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75 | |
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76 | // Function for scaling the dE/dx value (no scaling by default). |
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77 | // Returns scaling factor for a given ion-material couple and |
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78 | // a given kinetic energy. |
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79 | G4double ScalingFactorDEDX( |
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80 | const G4ParticleDefinition* particle, // Projectile (ion) |
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81 | const G4Material*, // Target material |
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82 | G4double kineticEnergy); // Kinetic energy |
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83 | |
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84 | |
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85 | // Function for defining a base particle for dE/dx calculation. |
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86 | // (no base particle by default). Returns atomic number of base |
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87 | // particle. |
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88 | G4int AtomicNumberBaseIon( |
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89 | G4int atomicNumberIon, // Atomic number of ion |
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90 | const G4Material*); // Target material |
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91 | |
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92 | private: |
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93 | void UpdateCacheParticle( |
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94 | const G4ParticleDefinition* particle); // Projectile (ion) |
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95 | |
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96 | void UpdateCacheMaterial( |
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97 | const G4Material* material); // Target material |
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98 | |
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99 | void CreateReferenceParticles(); |
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100 | |
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101 | G4double EquilibriumCharge( |
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102 | G4double mass, // Ion mass |
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103 | G4double charge, // Ion charge |
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104 | G4double atomicNumberPow, // Power of atomic nmb |
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105 | G4double kineticEnergy); // Kinetic energy |
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106 | |
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107 | // Scaling is only applied for ions with atomic numbers in the range |
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108 | // defined by the following parameters: |
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109 | G4int minAtomicNumber; |
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110 | G4int maxAtomicNumber; |
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111 | |
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112 | // Some properties of reference particle (Fe) are stored for faster access |
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113 | G4ParticleDefinition* referenceFe; |
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114 | G4int atomicNumberRefFe; |
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115 | G4int massNumberRefFe; |
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116 | G4double atomicNumberRefPow23Fe; |
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117 | G4double chargeRefFe; |
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118 | G4double massRefFe; |
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119 | |
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120 | // Some properties of reference particle (Ar) are stored for faster access |
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121 | G4ParticleDefinition* referenceAr; |
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122 | G4int atomicNumberRefAr; |
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123 | G4int massNumberRefAr; |
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124 | G4double atomicNumberRefPow23Ar; |
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125 | G4double chargeRefAr; |
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126 | G4double massRefAr; |
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127 | |
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128 | // Flag indicating the use of Fe ions as reference particles |
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129 | G4bool useFe; |
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130 | |
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131 | // Some properties of projectiles are stored for faster access |
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132 | const G4ParticleDefinition* cacheParticle; |
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133 | G4int cacheMassNumber; |
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134 | G4int cacheAtomicNumber; |
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135 | G4double cacheAtomicNumberPow23; |
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136 | G4double cacheCharge; |
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137 | G4double cacheMass; |
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138 | |
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139 | // Material pointer |
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140 | const G4Material* cacheMaterial; |
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141 | }; |
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142 | |
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143 | // ########################################################################### |
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144 | |
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145 | inline void G4IonDEDXScalingICRU73::UpdateCacheParticle ( |
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146 | const G4ParticleDefinition* particle) { // Projectile (ion) |
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147 | |
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148 | if(particle != cacheParticle) { |
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149 | |
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150 | cacheParticle = particle; |
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151 | cacheAtomicNumber = particle -> GetAtomicNumber(); |
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152 | cacheMassNumber = particle -> GetAtomicMass(); |
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153 | cacheCharge = particle -> GetPDGCharge(); |
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154 | cacheMass = particle -> GetPDGMass(); |
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155 | cacheAtomicNumberPow23 = std::pow(G4double(cacheAtomicNumber), 2./3.); |
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156 | } |
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157 | } |
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158 | |
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159 | // ########################################################################### |
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160 | |
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161 | inline void G4IonDEDXScalingICRU73::UpdateCacheMaterial ( |
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162 | const G4Material* material) { // Target material |
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163 | |
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164 | if(cacheMaterial != material) { |
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165 | |
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166 | cacheMaterial = material; |
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167 | |
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168 | useFe = true; |
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169 | |
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170 | size_t nmbElements = material -> GetNumberOfElements(); |
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171 | if( nmbElements > 1 ) useFe = false; |
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172 | |
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173 | if( material -> GetName() == "G4_WATER" ) useFe = true; |
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174 | } |
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175 | } |
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176 | |
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177 | // ########################################################################### |
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178 | |
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179 | inline G4double G4IonDEDXScalingICRU73::EquilibriumCharge( |
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180 | G4double mass, |
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181 | G4double charge, |
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182 | G4double atomicNumberPow, |
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183 | G4double kineticEnergy) { |
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184 | |
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185 | G4double totalEnergy = kineticEnergy + mass; |
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186 | G4double betaSquared = kineticEnergy * |
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187 | (totalEnergy + mass) / (totalEnergy * totalEnergy); |
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188 | |
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189 | G4double beta = std::sqrt( betaSquared ); |
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190 | |
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191 | G4double velOverBohrVel = beta / CLHEP::fine_structure_const; |
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192 | |
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193 | G4double q1 = 1.0 - std::exp(-velOverBohrVel / atomicNumberPow); |
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194 | |
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195 | return q1 * charge; |
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196 | } |
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197 | |
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198 | // ########################################################################### |
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199 | |
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200 | #endif |
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