1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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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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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 | // $Id: G4AdjointeIonisationModel.cc,v 1.2 2009/11/20 10:31:20 ldesorgh Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03 $ |
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28 | // |
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29 | #include "G4AdjointeIonisationModel.hh" |
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30 | #include "G4AdjointCSManager.hh" |
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31 | |
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32 | |
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33 | #include "G4Integrator.hh" |
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34 | #include "G4TrackStatus.hh" |
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35 | #include "G4ParticleChange.hh" |
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36 | #include "G4AdjointElectron.hh" |
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37 | #include "G4Gamma.hh" |
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38 | #include "G4AdjointGamma.hh" |
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39 | |
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40 | |
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41 | //////////////////////////////////////////////////////////////////////////////// |
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42 | // |
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43 | G4AdjointeIonisationModel::G4AdjointeIonisationModel(): |
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44 | G4VEmAdjointModel("Inv_eIon_model") |
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45 | |
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46 | { |
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47 | |
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48 | UseMatrix =true; |
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49 | UseMatrixPerElement = true; |
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50 | ApplyCutInRange = true; |
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51 | UseOnlyOneMatrixForAllElements = true; |
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52 | CS_biasing_factor =1.; |
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53 | WithRapidSampling = false; |
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54 | |
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55 | theAdjEquivOfDirectPrimPartDef =G4AdjointElectron::AdjointElectron(); |
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56 | theAdjEquivOfDirectSecondPartDef=G4AdjointElectron::AdjointElectron(); |
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57 | theDirectPrimaryPartDef=G4Electron::Electron(); |
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58 | second_part_of_same_type=true; |
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59 | } |
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60 | //////////////////////////////////////////////////////////////////////////////// |
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61 | // |
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62 | G4AdjointeIonisationModel::~G4AdjointeIonisationModel() |
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63 | {;} |
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64 | //////////////////////////////////////////////////////////////////////////////// |
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65 | // |
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66 | void G4AdjointeIonisationModel::SampleSecondaries(const G4Track& aTrack, |
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67 | G4bool IsScatProjToProjCase, |
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68 | G4ParticleChange* fParticleChange) |
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69 | { |
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70 | |
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71 | |
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72 | const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle(); |
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73 | |
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74 | //Elastic inverse scattering |
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75 | //--------------------------------------------------------- |
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76 | G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy(); |
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77 | G4double adjointPrimP =theAdjointPrimary->GetTotalMomentum(); |
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78 | |
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79 | if (adjointPrimKinEnergy>HighEnergyLimit*0.999){ |
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80 | return; |
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81 | } |
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82 | |
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83 | //Sample secondary energy |
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84 | //----------------------- |
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85 | G4double projectileKinEnergy; |
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86 | if (!WithRapidSampling ) { //used by default |
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87 | projectileKinEnergy = SampleAdjSecEnergyFromCSMatrix(adjointPrimKinEnergy, IsScatProjToProjCase); |
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88 | |
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89 | CorrectPostStepWeight(fParticleChange, |
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90 | aTrack.GetWeight(), |
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91 | adjointPrimKinEnergy, |
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92 | projectileKinEnergy, |
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93 | IsScatProjToProjCase); //Caution !!!this weight correction should be always applied |
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94 | } |
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95 | else { //only for test at the moment |
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96 | |
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97 | G4double Emin,Emax; |
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98 | if (IsScatProjToProjCase) { |
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99 | Emin=GetSecondAdjEnergyMinForScatProjToProjCase(adjointPrimKinEnergy,currentTcutForDirectSecond); |
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100 | Emax=GetSecondAdjEnergyMaxForScatProjToProjCase(adjointPrimKinEnergy); |
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101 | } |
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102 | else { |
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103 | Emin=GetSecondAdjEnergyMinForProdToProjCase(adjointPrimKinEnergy); |
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104 | Emax=GetSecondAdjEnergyMaxForProdToProjCase(adjointPrimKinEnergy); |
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105 | } |
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106 | projectileKinEnergy = Emin*std::pow(Emax/Emin,G4UniformRand()); |
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107 | |
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108 | |
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109 | |
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110 | lastCS=lastAdjointCSForScatProjToProjCase; |
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111 | if ( !IsScatProjToProjCase) lastCS=lastAdjointCSForProdToProjCase; |
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112 | |
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113 | G4double new_weight=aTrack.GetWeight(); |
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114 | G4double used_diffCS=lastCS*std::log(Emax/Emin)/projectileKinEnergy; |
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115 | G4double needed_diffCS=adjointPrimKinEnergy/projectileKinEnergy; |
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116 | if (!IsScatProjToProjCase) needed_diffCS *=DiffCrossSectionPerVolumePrimToSecond(currentMaterial,projectileKinEnergy,adjointPrimKinEnergy); |
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117 | else needed_diffCS *=DiffCrossSectionPerVolumePrimToScatPrim(currentMaterial,projectileKinEnergy,adjointPrimKinEnergy); |
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118 | new_weight*=needed_diffCS/used_diffCS; |
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119 | fParticleChange->SetParentWeightByProcess(false); |
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120 | fParticleChange->SetSecondaryWeightByProcess(false); |
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121 | fParticleChange->ProposeParentWeight(new_weight); |
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122 | |
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123 | |
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124 | } |
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125 | |
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126 | |
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127 | |
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128 | //Kinematic: |
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129 | //we consider a two body elastic scattering for the forward processes where the projectile knock on an e- at rest and gives |
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130 | // him part of its energy |
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131 | //---------------------------------------------------------------------------------------- |
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132 | |
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133 | G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass(); |
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134 | G4double projectileTotalEnergy = projectileM0+projectileKinEnergy; |
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135 | G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0; |
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136 | |
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137 | |
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138 | |
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139 | //Companion |
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140 | //----------- |
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141 | G4double companionM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass(); |
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142 | if (IsScatProjToProjCase) { |
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143 | companionM0=theAdjEquivOfDirectSecondPartDef->GetPDGMass(); |
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144 | } |
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145 | G4double companionTotalEnergy =companionM0+ projectileKinEnergy-adjointPrimKinEnergy; |
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146 | G4double companionP2 = companionTotalEnergy*companionTotalEnergy - companionM0*companionM0; |
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147 | |
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148 | |
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149 | //Projectile momentum |
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150 | //-------------------- |
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151 | G4double P_parallel = (adjointPrimP*adjointPrimP + projectileP2 - companionP2)/(2.*adjointPrimP); |
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152 | G4double P_perp = std::sqrt( projectileP2 - P_parallel*P_parallel); |
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153 | G4ThreeVector dir_parallel=theAdjointPrimary->GetMomentumDirection(); |
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154 | G4double phi =G4UniformRand()*2.*3.1415926; |
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155 | G4ThreeVector projectileMomentum = G4ThreeVector(P_perp*std::cos(phi),P_perp*std::sin(phi),P_parallel); |
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156 | projectileMomentum.rotateUz(dir_parallel); |
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157 | |
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158 | |
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159 | |
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160 | if (!IsScatProjToProjCase ){ //kill the primary and add a secondary |
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161 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
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162 | fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum)); |
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163 | //G4cout<<"projectileMomentum "<<projectileMomentum<<G4endl; |
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164 | } |
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165 | else { |
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166 | fParticleChange->ProposeEnergy(projectileKinEnergy); |
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167 | fParticleChange->ProposeMomentumDirection(projectileMomentum.unit()); |
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168 | } |
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169 | |
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170 | |
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171 | |
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172 | |
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173 | } |
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174 | //////////////////////////////////////////////////////////////////////////////// |
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175 | // |
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176 | //The implementation here is correct for energy loss process, for the photoelectric and compton scattering the method should be redefine |
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177 | G4double G4AdjointeIonisationModel::DiffCrossSectionPerAtomPrimToSecond( |
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178 | G4double kinEnergyProj, |
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179 | G4double kinEnergyProd, |
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180 | G4double Z, |
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181 | G4double ) |
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182 | { |
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183 | G4double dSigmadEprod=0; |
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184 | G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(kinEnergyProd); |
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185 | G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(kinEnergyProd); |
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186 | |
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187 | |
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188 | if (kinEnergyProj>Emin_proj && kinEnergyProj<=Emax_proj){ //the produced particle should have a kinetic energy smaller than the projectile |
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189 | dSigmadEprod=Z*DiffCrossSectionMoller(kinEnergyProj,kinEnergyProd); |
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190 | } |
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191 | return dSigmadEprod; |
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192 | |
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193 | |
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194 | |
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195 | } |
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196 | |
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197 | ////////////////////////////////////////////////////////////////////////////// |
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198 | // |
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199 | G4double G4AdjointeIonisationModel::DiffCrossSectionMoller(G4double kinEnergyProj,G4double kinEnergyProd){ |
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200 | G4double electron_mass_c2=0.51099906*MeV; |
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201 | G4double energy = kinEnergyProj + electron_mass_c2; |
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202 | G4double x = kinEnergyProd/kinEnergyProj; |
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203 | G4double gam = energy/electron_mass_c2; |
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204 | G4double gamma2 = gam*gam; |
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205 | G4double beta2 = 1.0 - 1.0/gamma2; |
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206 | |
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207 | G4double g = (2.0*gam - 1.0)/gamma2; |
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208 | G4double y = 1.0 - x; |
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209 | G4double fac=twopi_mc2_rcl2/electron_mass_c2; |
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210 | G4double dCS = fac*( 1.-g + ((1.0 - g*x)/(x*x)) + ((1.0 - g*y)/(y*y)))/(beta2*(gam-1)); |
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211 | return dCS/kinEnergyProj; |
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212 | |
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213 | |
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214 | |
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215 | } |
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216 | |
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