[819] | 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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[1228] | 26 | // $Id: G4BetheBlochModel.cc,v 1.36 2009/12/03 17:26:40 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-03 $ |
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[819] | 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: G4BetheBlochModel |
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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: 03.01.2002 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // |
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| 42 | // 04-12-02 Fix problem of G4DynamicParticle constructor (V.Ivanchenko) |
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| 43 | // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko) |
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| 44 | // 27-01-03 Make models region aware (V.Ivanchenko) |
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| 45 | // 13-02-03 Add name (V.Ivanchenko) |
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| 46 | // 24-03-05 Add G4EmCorrections (V.Ivanchenko) |
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[961] | 47 | // 11-04-05 Major optimisation of internal interfaces (V.Ivanchenko) |
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[819] | 48 | // 11-02-06 ComputeCrossSectionPerElectron, ComputeCrossSectionPerAtom (mma) |
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| 49 | // 12-02-06 move G4LossTableManager::Instance()->EmCorrections() |
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| 50 | // in constructor (mma) |
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[961] | 51 | // 12-08-08 Added methods GetParticleCharge, GetChargeSquareRatio, |
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| 52 | // CorrectionsAlongStep needed for ions(V.Ivanchenko) |
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[819] | 53 | // |
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| 54 | // ------------------------------------------------------------------- |
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| 55 | // |
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| 56 | |
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| 57 | |
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| 58 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 59 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 60 | |
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| 61 | #include "G4BetheBlochModel.hh" |
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| 62 | #include "Randomize.hh" |
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| 63 | #include "G4Electron.hh" |
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| 64 | #include "G4LossTableManager.hh" |
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| 65 | #include "G4EmCorrections.hh" |
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| 66 | #include "G4ParticleChangeForLoss.hh" |
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| 67 | |
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| 68 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 69 | |
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| 70 | using namespace std; |
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| 71 | |
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| 72 | G4BetheBlochModel::G4BetheBlochModel(const G4ParticleDefinition* p, |
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| 73 | const G4String& nam) |
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| 74 | : G4VEmModel(nam), |
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[961] | 75 | particle(0), |
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| 76 | tlimit(DBL_MAX), |
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| 77 | twoln10(2.0*log(10.0)), |
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| 78 | bg2lim(0.0169), |
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| 79 | taulim(8.4146e-3), |
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| 80 | isIon(false), |
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| 81 | isInitialised(false) |
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[819] | 82 | { |
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[961] | 83 | fParticleChange = 0; |
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[1055] | 84 | if(p) { |
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| 85 | SetGenericIon(p); |
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| 86 | SetParticle(p); |
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| 87 | } |
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[819] | 88 | theElectron = G4Electron::Electron(); |
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| 89 | corr = G4LossTableManager::Instance()->EmCorrections(); |
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[961] | 90 | nist = G4NistManager::Instance(); |
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| 91 | SetLowEnergyLimit(2.0*MeV); |
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[819] | 92 | } |
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| 93 | |
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| 94 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 95 | |
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| 96 | G4BetheBlochModel::~G4BetheBlochModel() |
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| 97 | {} |
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| 98 | |
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| 99 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 100 | |
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| 101 | G4double G4BetheBlochModel::MinEnergyCut(const G4ParticleDefinition*, |
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| 102 | const G4MaterialCutsCouple* couple) |
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| 103 | { |
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| 104 | return couple->GetMaterial()->GetIonisation()->GetMeanExcitationEnergy(); |
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| 105 | } |
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| 106 | |
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| 107 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 108 | |
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| 109 | void G4BetheBlochModel::Initialise(const G4ParticleDefinition* p, |
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| 110 | const G4DataVector&) |
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| 111 | { |
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[1055] | 112 | SetGenericIon(p); |
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| 113 | SetParticle(p); |
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[819] | 114 | |
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[1055] | 115 | //G4cout << "G4BetheBlochModel::Initialise for " << p->GetParticleName() |
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| 116 | // << " isIon= " << isIon |
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| 117 | // << G4endl; |
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| 118 | |
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[961] | 119 | corrFactor = chargeSquare; |
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[1055] | 120 | // always false before the run |
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| 121 | SetDeexcitationFlag(false); |
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[961] | 122 | |
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| 123 | if(!isInitialised) { |
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| 124 | isInitialised = true; |
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[1055] | 125 | fParticleChange = GetParticleChangeForLoss(); |
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[961] | 126 | } |
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[819] | 127 | } |
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| 128 | |
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| 129 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 130 | |
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[961] | 131 | G4double G4BetheBlochModel::GetChargeSquareRatio(const G4ParticleDefinition* p, |
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| 132 | const G4Material* mat, |
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| 133 | G4double kineticEnergy) |
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[819] | 134 | { |
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[961] | 135 | // this method is called only for ions |
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| 136 | G4double q2 = corr->EffectiveChargeSquareRatio(p,mat,kineticEnergy); |
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| 137 | corrFactor = q2*corr->EffectiveChargeCorrection(p,mat,kineticEnergy); |
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| 138 | return corrFactor; |
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| 139 | } |
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| 140 | |
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| 141 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 142 | |
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| 143 | G4double G4BetheBlochModel::GetParticleCharge(const G4ParticleDefinition* p, |
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| 144 | const G4Material* mat, |
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| 145 | G4double kineticEnergy) |
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| 146 | { |
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| 147 | // this method is called only for ions |
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| 148 | return corr->GetParticleCharge(p,mat,kineticEnergy); |
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| 149 | } |
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| 150 | |
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| 151 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 152 | |
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| 153 | G4double |
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| 154 | G4BetheBlochModel::ComputeCrossSectionPerElectron(const G4ParticleDefinition* p, |
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| 155 | G4double kineticEnergy, |
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| 156 | G4double cutEnergy, |
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| 157 | G4double maxKinEnergy) |
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| 158 | { |
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[819] | 159 | G4double cross = 0.0; |
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| 160 | G4double tmax = MaxSecondaryEnergy(p, kineticEnergy); |
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| 161 | G4double maxEnergy = min(tmax,maxKinEnergy); |
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| 162 | if(cutEnergy < maxEnergy) { |
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| 163 | |
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| 164 | G4double totEnergy = kineticEnergy + mass; |
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| 165 | G4double energy2 = totEnergy*totEnergy; |
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| 166 | G4double beta2 = kineticEnergy*(kineticEnergy + 2.0*mass)/energy2; |
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| 167 | |
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[961] | 168 | cross = 1.0/cutEnergy - 1.0/maxEnergy |
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| 169 | - beta2*log(maxEnergy/cutEnergy)/tmax; |
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[819] | 170 | |
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| 171 | // +term for spin=1/2 particle |
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| 172 | if( 0.5 == spin ) cross += 0.5*(maxEnergy - cutEnergy)/energy2; |
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| 173 | |
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[961] | 174 | // High order correction different for hadrons and ions |
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| 175 | // nevetheless they are applied to reduce high energy transfers |
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| 176 | // if(!isIon) |
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| 177 | //cross += corr->FiniteSizeCorrectionXS(p,currentMaterial, |
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| 178 | // kineticEnergy,cutEnergy); |
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| 179 | |
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[819] | 180 | cross *= twopi_mc2_rcl2*chargeSquare/beta2; |
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| 181 | } |
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| 182 | |
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| 183 | // G4cout << "BB: e= " << kineticEnergy << " tmin= " << cutEnergy |
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| 184 | // << " tmax= " << tmax << " cross= " << cross << G4endl; |
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| 185 | |
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| 186 | return cross; |
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| 187 | } |
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| 188 | |
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| 189 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 190 | |
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| 191 | G4double G4BetheBlochModel::ComputeCrossSectionPerAtom( |
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| 192 | const G4ParticleDefinition* p, |
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| 193 | G4double kineticEnergy, |
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| 194 | G4double Z, G4double, |
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| 195 | G4double cutEnergy, |
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| 196 | G4double maxEnergy) |
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| 197 | { |
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| 198 | G4double cross = Z*ComputeCrossSectionPerElectron |
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| 199 | (p,kineticEnergy,cutEnergy,maxEnergy); |
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| 200 | return cross; |
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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 | G4double G4BetheBlochModel::CrossSectionPerVolume( |
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| 206 | const G4Material* material, |
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| 207 | const G4ParticleDefinition* p, |
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| 208 | G4double kineticEnergy, |
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| 209 | G4double cutEnergy, |
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| 210 | G4double maxEnergy) |
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| 211 | { |
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[961] | 212 | currentMaterial = material; |
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[819] | 213 | G4double eDensity = material->GetElectronDensity(); |
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| 214 | G4double cross = eDensity*ComputeCrossSectionPerElectron |
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| 215 | (p,kineticEnergy,cutEnergy,maxEnergy); |
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| 216 | return cross; |
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| 217 | } |
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| 218 | |
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| 219 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 220 | |
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| 221 | G4double G4BetheBlochModel::ComputeDEDXPerVolume(const G4Material* material, |
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| 222 | const G4ParticleDefinition* p, |
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| 223 | G4double kineticEnergy, |
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| 224 | G4double cut) |
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| 225 | { |
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| 226 | G4double tmax = MaxSecondaryEnergy(p, kineticEnergy); |
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| 227 | G4double cutEnergy = min(cut,tmax); |
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| 228 | |
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| 229 | G4double tau = kineticEnergy/mass; |
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| 230 | G4double gam = tau + 1.0; |
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| 231 | G4double bg2 = tau * (tau+2.0); |
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| 232 | G4double beta2 = bg2/(gam*gam); |
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| 233 | |
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| 234 | G4double eexc = material->GetIonisation()->GetMeanExcitationEnergy(); |
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| 235 | G4double eexc2 = eexc*eexc; |
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[1196] | 236 | //G4double cden = material->GetIonisation()->GetCdensity(); |
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| 237 | //G4double mden = material->GetIonisation()->GetMdensity(); |
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| 238 | //G4double aden = material->GetIonisation()->GetAdensity(); |
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| 239 | //G4double x0den = material->GetIonisation()->GetX0density(); |
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| 240 | //G4double x1den = material->GetIonisation()->GetX1density(); |
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[819] | 241 | |
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| 242 | G4double eDensity = material->GetElectronDensity(); |
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| 243 | |
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| 244 | G4double dedx = log(2.0*electron_mass_c2*bg2*cutEnergy/eexc2) |
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| 245 | - (1.0 + cutEnergy/tmax)*beta2; |
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| 246 | |
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| 247 | if(0.5 == spin) { |
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| 248 | G4double del = 0.5*cutEnergy/(kineticEnergy + mass); |
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| 249 | dedx += del*del; |
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| 250 | } |
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| 251 | |
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| 252 | // density correction |
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| 253 | G4double x = log(bg2)/twoln10; |
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[1196] | 254 | //if ( x >= x0den ) { |
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| 255 | // dedx -= twoln10*x - cden ; |
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| 256 | // if ( x < x1den ) dedx -= aden*pow((x1den-x),mden) ; |
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| 257 | //} |
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| 258 | dedx -= material->GetIonisation()->DensityCorrection(x); |
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[819] | 259 | |
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| 260 | // shell correction |
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| 261 | dedx -= 2.0*corr->ShellCorrection(p,material,kineticEnergy); |
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| 262 | |
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| 263 | // now compute the total ionization loss |
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| 264 | |
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| 265 | if (dedx < 0.0) dedx = 0.0 ; |
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| 266 | |
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| 267 | dedx *= twopi_mc2_rcl2*chargeSquare*eDensity/beta2; |
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| 268 | |
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[961] | 269 | //High order correction different for hadrons and ions |
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| 270 | if(isIon) { |
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| 271 | dedx += corr->IonBarkasCorrection(p,material,kineticEnergy); |
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| 272 | } else { |
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| 273 | dedx += corr->HighOrderCorrections(p,material,kineticEnergy,cutEnergy); |
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| 274 | } |
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[819] | 275 | return dedx; |
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| 276 | } |
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| 277 | |
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| 278 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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[1228] | 279 | /* |
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| 280 | void G4BetheBlochModel::CorrectionsAlongStep(const G4MaterialCutsCouple*, |
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| 281 | const G4DynamicParticle*, |
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| 282 | G4double&, |
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| 283 | G4double&, |
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| 284 | G4double) |
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| 285 | {} |
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| 286 | */ |
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[819] | 287 | |
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[961] | 288 | void G4BetheBlochModel::CorrectionsAlongStep(const G4MaterialCutsCouple* couple, |
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| 289 | const G4DynamicParticle* dp, |
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| 290 | G4double& eloss, |
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| 291 | G4double&, |
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| 292 | G4double length) |
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| 293 | { |
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[1196] | 294 | if(isIon) { |
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| 295 | const G4ParticleDefinition* p = dp->GetDefinition(); |
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| 296 | const G4Material* mat = couple->GetMaterial(); |
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| 297 | G4double preKinEnergy = dp->GetKineticEnergy(); |
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| 298 | G4double e = preKinEnergy - eloss*0.5; |
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| 299 | if(e < 0.0) e = preKinEnergy*0.5; |
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[961] | 300 | |
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| 301 | G4double q2 = corr->EffectiveChargeSquareRatio(p,mat,e); |
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| 302 | GetModelOfFluctuations()->SetParticleAndCharge(p, q2); |
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[1228] | 303 | G4double qfactor = q2*corr->EffectiveChargeCorrection(p,mat,e)/corrFactor; |
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| 304 | G4double highOrder = length*corr->IonHighOrderCorrections(p,couple,e); |
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| 305 | eloss *= qfactor; |
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| 306 | eloss += highOrder; |
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| 307 | //G4cout << "G4BetheBlochModel::CorrectionsAlongStep: e= " << preKinEnergy |
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| 308 | // << " qfactor= " << qfactor |
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| 309 | // << " highOrder= " << highOrder << " (" << highOrder/eloss << ")" << G4endl; |
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[961] | 310 | } |
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| 311 | } |
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| 312 | |
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| 313 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 314 | |
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[819] | 315 | void G4BetheBlochModel::SampleSecondaries(vector<G4DynamicParticle*>* vdp, |
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| 316 | const G4MaterialCutsCouple*, |
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| 317 | const G4DynamicParticle* dp, |
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| 318 | G4double minKinEnergy, |
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| 319 | G4double maxEnergy) |
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| 320 | { |
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| 321 | G4double kineticEnergy = dp->GetKineticEnergy(); |
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| 322 | G4double tmax = MaxSecondaryEnergy(dp->GetDefinition(),kineticEnergy); |
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| 323 | |
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[961] | 324 | G4double maxKinEnergy = std::min(maxEnergy,tmax); |
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[819] | 325 | if(minKinEnergy >= maxKinEnergy) return; |
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| 326 | |
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| 327 | G4double totEnergy = kineticEnergy + mass; |
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| 328 | G4double etot2 = totEnergy*totEnergy; |
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| 329 | G4double beta2 = kineticEnergy*(kineticEnergy + 2.0*mass)/etot2; |
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| 330 | |
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[961] | 331 | G4double deltaKinEnergy, f; |
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| 332 | G4double f1 = 0.0; |
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| 333 | G4double fmax = 1.0; |
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| 334 | if( 0.5 == spin ) fmax += 0.5*maxKinEnergy*maxKinEnergy/etot2; |
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[819] | 335 | |
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[961] | 336 | // sampling without nuclear size effect |
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[819] | 337 | do { |
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| 338 | G4double q = G4UniformRand(); |
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| 339 | deltaKinEnergy = minKinEnergy*maxKinEnergy |
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| 340 | /(minKinEnergy*(1.0 - q) + maxKinEnergy*q); |
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| 341 | |
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| 342 | f = 1.0 - beta2*deltaKinEnergy/tmax; |
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[961] | 343 | if( 0.5 == spin ) { |
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| 344 | f1 = 0.5*deltaKinEnergy*deltaKinEnergy/etot2; |
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| 345 | f += f1; |
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| 346 | } |
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[819] | 347 | |
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[961] | 348 | } while( fmax*G4UniformRand() > f); |
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| 349 | |
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| 350 | // projectile formfactor - suppresion of high energy |
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| 351 | // delta-electron production at high energy |
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| 352 | |
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| 353 | G4double x = formfact*deltaKinEnergy; |
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| 354 | if(x > 1.e-6) { |
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| 355 | |
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| 356 | G4double x1 = 1.0 + x; |
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| 357 | G4double g = 1.0/(x1*x1); |
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| 358 | if( 0.5 == spin ) { |
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| 359 | G4double x2 = 0.5*electron_mass_c2*deltaKinEnergy/(mass*mass); |
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| 360 | g *= (1.0 + magMoment2*(x2 - f1/f)/(1.0 + x2)); |
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[819] | 361 | } |
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[961] | 362 | if(g > 1.0) { |
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| 363 | G4cout << "### G4BetheBlochModel WARNING: g= " << g |
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| 364 | << dp->GetDefinition()->GetParticleName() |
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| 365 | << " Ekin(MeV)= " << kineticEnergy |
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| 366 | << " delEkin(MeV)= " << deltaKinEnergy |
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| 367 | << G4endl; |
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| 368 | } |
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| 369 | if(G4UniformRand() > g) return; |
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| 370 | } |
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[819] | 371 | |
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[961] | 372 | // delta-electron is produced |
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[819] | 373 | G4double totMomentum = totEnergy*sqrt(beta2); |
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| 374 | G4double deltaMomentum = |
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| 375 | sqrt(deltaKinEnergy * (deltaKinEnergy + 2.0*electron_mass_c2)); |
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| 376 | G4double cost = deltaKinEnergy * (totEnergy + electron_mass_c2) / |
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| 377 | (deltaMomentum * totMomentum); |
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[1055] | 378 | /* |
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[819] | 379 | if(cost > 1.0) { |
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| 380 | G4cout << "### G4BetheBlochModel WARNING: cost= " |
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| 381 | << cost << " > 1 for " |
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| 382 | << dp->GetDefinition()->GetParticleName() |
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| 383 | << " Ekin(MeV)= " << kineticEnergy |
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| 384 | << " p(MeV/c)= " << totMomentum |
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| 385 | << " delEkin(MeV)= " << deltaKinEnergy |
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| 386 | << " delMom(MeV/c)= " << deltaMomentum |
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| 387 | << " tmin(MeV)= " << minKinEnergy |
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| 388 | << " tmax(MeV)= " << maxKinEnergy |
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| 389 | << " dir= " << dp->GetMomentumDirection() |
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| 390 | << G4endl; |
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| 391 | cost = 1.0; |
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| 392 | } |
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[1055] | 393 | */ |
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[819] | 394 | G4double sint = sqrt((1.0 - cost)*(1.0 + cost)); |
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| 395 | |
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| 396 | G4double phi = twopi * G4UniformRand() ; |
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| 397 | |
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| 398 | |
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| 399 | G4ThreeVector deltaDirection(sint*cos(phi),sint*sin(phi), cost); |
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| 400 | G4ThreeVector direction = dp->GetMomentumDirection(); |
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| 401 | deltaDirection.rotateUz(direction); |
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| 402 | |
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| 403 | // create G4DynamicParticle object for delta ray |
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| 404 | G4DynamicParticle* delta = new G4DynamicParticle(theElectron, |
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[1055] | 405 | deltaDirection,deltaKinEnergy); |
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[819] | 406 | |
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| 407 | vdp->push_back(delta); |
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| 408 | |
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| 409 | // Change kinematics of primary particle |
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| 410 | kineticEnergy -= deltaKinEnergy; |
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| 411 | G4ThreeVector finalP = direction*totMomentum - deltaDirection*deltaMomentum; |
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| 412 | finalP = finalP.unit(); |
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| 413 | |
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| 414 | fParticleChange->SetProposedKineticEnergy(kineticEnergy); |
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| 415 | fParticleChange->SetProposedMomentumDirection(finalP); |
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| 416 | } |
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| 417 | |
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[1055] | 418 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 419 | |
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| 420 | G4double G4BetheBlochModel::MaxSecondaryEnergy(const G4ParticleDefinition* pd, |
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| 421 | G4double kinEnergy) |
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| 422 | { |
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| 423 | // here particle type is checked for any method |
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| 424 | SetParticle(pd); |
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| 425 | G4double tau = kinEnergy/mass; |
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| 426 | G4double tmax = 2.0*electron_mass_c2*tau*(tau + 2.) / |
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| 427 | (1. + 2.0*(tau + 1.)*ratio + ratio*ratio); |
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| 428 | return std::min(tmax,tlimit); |
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| 429 | } |
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| 430 | |
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[819] | 431 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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