[1197] | 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 | // $Id: G4AdjointeIonisationModel.cc,v 1.2 2009/11/20 10:31:20 ldesorgh Exp $ |
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[1228] | 27 | // GEANT4 tag $Name: geant4-09-03 $ |
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[1197] | 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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