1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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11 | // * Neither the authors of this software system, nor their employing * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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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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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 | // $Id: G4MuPairProductionModel.hh,v 1.28 2009/02/20 14:48:16 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03-beta-cand-01 $ |
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28 | // |
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29 | // ------------------------------------------------------------------- |
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30 | // |
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31 | // GEANT4 Class header file |
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32 | // |
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33 | // |
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34 | // File name: G4MuPairProductionModel |
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35 | // |
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36 | // Author: Vladimir Ivanchenko on base of Laszlo Urban code |
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37 | // |
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38 | // Creation date: 18.05.2002 |
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39 | // |
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40 | // Modifications: |
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41 | // |
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42 | // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko) |
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43 | // 27-01-03 Make models region aware (V.Ivanchenko) |
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44 | // 13-02-03 Add name (V.Ivanchenko) |
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45 | // 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko) |
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46 | // 10-02-04 Add lowestKinEnergy (V.Ivanchenko) |
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47 | // 13-02-06 Add ComputeCrossSectionPerAtom (mma) |
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48 | // 12-05-06 Add parameter to SelectRandomAtom (A.Bogdanov) |
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49 | // 11-10-07 Add ignoreCut flag (V.Ivanchenko) |
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50 | // 28-02-08 Reorganized protected methods and members (V.Ivanchenko) |
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51 | |
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52 | // |
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53 | // Class Description: |
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54 | // |
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55 | // Implementation of e+e- pair production by muons |
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56 | // |
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57 | |
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58 | // ------------------------------------------------------------------- |
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59 | // |
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60 | |
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61 | #ifndef G4MuPairProductionModel_h |
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62 | #define G4MuPairProductionModel_h 1 |
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63 | |
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64 | #include "G4VEmModel.hh" |
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65 | #include "G4NistManager.hh" |
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66 | #include <vector> |
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67 | |
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68 | class G4Element; |
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69 | class G4ParticleChangeForLoss; |
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70 | class G4ParticleChangeForGamma; |
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71 | |
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72 | class G4MuPairProductionModel : public G4VEmModel |
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73 | { |
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74 | public: |
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75 | |
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76 | G4MuPairProductionModel(const G4ParticleDefinition* p = 0, |
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77 | const G4String& nam = "muPairProd"); |
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78 | |
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79 | virtual ~G4MuPairProductionModel(); |
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80 | |
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81 | virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&); |
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82 | |
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83 | |
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84 | virtual G4double ComputeCrossSectionPerAtom( |
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85 | const G4ParticleDefinition*, |
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86 | G4double kineticEnergy, |
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87 | G4double Z, G4double A, |
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88 | G4double cutEnergy, |
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89 | G4double maxEnergy); |
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90 | |
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91 | virtual G4double ComputeDEDXPerVolume(const G4Material*, |
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92 | const G4ParticleDefinition*, |
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93 | G4double kineticEnergy, |
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94 | G4double cutEnergy); |
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95 | |
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96 | virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*, |
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97 | const G4MaterialCutsCouple*, |
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98 | const G4DynamicParticle*, |
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99 | G4double tmin, |
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100 | G4double maxEnergy); |
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101 | |
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102 | virtual G4double MinEnergyCut(const G4ParticleDefinition*, |
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103 | const G4MaterialCutsCouple*); |
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104 | |
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105 | inline void SetLowestKineticEnergy(G4double e); |
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106 | |
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107 | inline void SetParticle(const G4ParticleDefinition*); |
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108 | |
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109 | protected: |
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110 | |
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111 | G4double ComputMuPairLoss(G4double Z, G4double tkin, G4double cut, |
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112 | G4double tmax); |
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113 | |
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114 | G4double ComputeMicroscopicCrossSection(G4double tkin, |
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115 | G4double Z, |
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116 | G4double cut); |
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117 | |
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118 | virtual G4double ComputeDMicroscopicCrossSection(G4double tkin, |
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119 | G4double Z, |
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120 | G4double pairEnergy); |
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121 | |
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122 | virtual G4double MaxSecondaryEnergy(const G4ParticleDefinition*, |
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123 | G4double kineticEnergy); |
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124 | |
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125 | inline void SetCurrentElement(G4double Z); |
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126 | |
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127 | private: |
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128 | |
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129 | const G4Element* SelectRandomAtom(G4double kinEnergy, |
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130 | G4double dt, |
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131 | G4int it, |
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132 | const G4MaterialCutsCouple* couple, |
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133 | G4double tmin); |
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134 | |
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135 | void MakeSamplingTables(); |
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136 | |
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137 | inline G4double InterpolatedIntegralCrossSection( |
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138 | G4double dt, G4double dz, G4int iz, |
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139 | G4int it, G4int iy, G4double z); |
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140 | |
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141 | // hide assignment operator |
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142 | G4MuPairProductionModel & operator=(const G4MuPairProductionModel &right); |
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143 | G4MuPairProductionModel(const G4MuPairProductionModel&); |
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144 | |
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145 | protected: |
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146 | |
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147 | const G4ParticleDefinition* particle; |
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148 | G4NistManager* nist; |
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149 | |
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150 | G4double factorForCross; |
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151 | G4double sqrte; |
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152 | G4double particleMass; |
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153 | G4double currentZ; |
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154 | G4double z13; |
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155 | G4double z23; |
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156 | G4double lnZ; |
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157 | |
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158 | static G4double xgi[8],wgi[8]; |
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159 | |
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160 | private: |
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161 | |
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162 | G4ParticleDefinition* theElectron; |
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163 | G4ParticleDefinition* thePositron; |
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164 | G4ParticleChangeForLoss* fParticleChange; |
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165 | |
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166 | G4double minPairEnergy; |
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167 | G4double lowestKinEnergy; |
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168 | |
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169 | // tables for sampling |
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170 | G4int nzdat; |
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171 | G4int ntdat; |
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172 | G4int nbiny; |
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173 | size_t nmaxElements; |
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174 | static G4double zdat[5],adat[5],tdat[8]; |
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175 | G4double ya[1001],proba[5][8][1001]; |
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176 | |
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177 | G4double ymin; |
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178 | G4double ymax; |
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179 | G4double dy; |
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180 | |
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181 | G4bool samplingTablesAreFilled; |
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182 | std::vector<G4double> partialSum; |
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183 | }; |
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184 | |
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185 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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186 | |
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187 | inline void G4MuPairProductionModel::SetLowestKineticEnergy(G4double e) |
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188 | { |
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189 | lowestKinEnergy = e; |
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190 | } |
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191 | |
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192 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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193 | |
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194 | inline |
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195 | void G4MuPairProductionModel::SetParticle(const G4ParticleDefinition* p) |
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196 | { |
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197 | if(!particle) { |
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198 | particle = p; |
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199 | particleMass = particle->GetPDGMass(); |
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200 | } |
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201 | } |
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202 | |
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203 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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204 | |
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205 | inline void G4MuPairProductionModel::SetCurrentElement(G4double Z) |
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206 | { |
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207 | if(Z != currentZ) { |
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208 | currentZ = Z; |
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209 | G4int iz = G4int(Z); |
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210 | z13 = nist->GetZ13(iz); |
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211 | z23 = z13*z13; |
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212 | lnZ = nist->GetLOGZ(iz); |
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213 | } |
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214 | } |
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215 | |
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216 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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217 | |
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218 | inline G4double G4MuPairProductionModel::InterpolatedIntegralCrossSection( |
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219 | G4double dt, G4double dz, |
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220 | G4int iz, G4int it, G4int iy, G4double z) |
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221 | { |
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222 | G4double fac = 1./(zdat[iz] *(zdat[iz] +1.)); |
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223 | G4double fac1 = 1./(zdat[iz-1]*(zdat[iz-1]+1.)); |
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224 | G4double f0 = fac1*proba[iz-1][it-1][iy] + |
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225 | (fac*proba[iz][it-1][iy]-fac1*proba[iz-1][it-1][iy])*dz; |
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226 | G4double f1 = fac1*proba[iz-1][it ][iy] + |
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227 | (fac*proba[iz][it ][iy]-fac1*proba[iz-1][it ][iy])*dz; |
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228 | return (f0 + (f1-f0)*dt)*z*(z+1.); |
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229 | } |
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230 | |
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231 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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232 | |
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233 | #endif |
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