[966] | 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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[1055] | 26 | // $Id: G4WentzelVIModel.hh,v 1.17 2009/05/10 16:09:29 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-03-beta-cand-01 $ |
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[966] | 28 | // |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // |
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| 31 | // |
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| 32 | // GEANT4 Class header file |
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| 33 | // |
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| 34 | // |
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| 35 | // File name: G4WentzelVIModel |
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| 36 | // |
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| 37 | // Author: V.Ivanchenko |
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| 38 | // |
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| 39 | // Creation date: 09.04.2008 from G4MuMscModel |
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| 40 | // |
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| 41 | // Modifications: |
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| 42 | // |
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| 43 | // |
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| 44 | // Class Description: |
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| 45 | // |
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| 46 | // Implementation of the model of multiple scattering based on |
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| 47 | // G.Wentzel, Z. Phys. 40 (1927) 590. |
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| 48 | // H.W.Lewis, Phys Rev 78 (1950) 526. |
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| 49 | // J.M. Fernandez-Varea et al., NIM B73 (1993) 447. |
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| 50 | // L.Urban, CERN-OPEN-2006-077. |
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| 51 | |
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| 52 | // ------------------------------------------------------------------- |
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| 53 | // |
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| 54 | |
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| 55 | #ifndef G4WentzelVIModel_h |
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| 56 | #define G4WentzelVIModel_h 1 |
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| 57 | |
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| 58 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 59 | |
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| 60 | #include "G4VMscModel.hh" |
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| 61 | #include "G4PhysicsTable.hh" |
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| 62 | #include "G4MscStepLimitType.hh" |
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| 63 | #include "G4MaterialCutsCouple.hh" |
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| 64 | #include "G4NistManager.hh" |
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| 65 | |
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| 66 | class G4LossTableManager; |
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| 67 | class G4ParticleChangeForMSC; |
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| 68 | class G4ParticleDefinition; |
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| 69 | |
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| 70 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 71 | |
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| 72 | class G4WentzelVIModel : public G4VMscModel |
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| 73 | { |
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| 74 | |
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| 75 | public: |
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| 76 | |
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| 77 | G4WentzelVIModel(const G4String& nam = "WentzelVIUni"); |
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| 78 | |
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| 79 | virtual ~G4WentzelVIModel(); |
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| 80 | |
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[1055] | 81 | virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&); |
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[966] | 82 | |
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[1055] | 83 | virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*, |
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| 84 | G4double KineticEnergy, |
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| 85 | G4double AtomicNumber, |
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| 86 | G4double AtomicWeight=0., |
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| 87 | G4double cut = DBL_MAX, |
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| 88 | G4double emax= DBL_MAX); |
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[966] | 89 | |
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[1055] | 90 | virtual void SampleScattering(const G4DynamicParticle*, G4double safety); |
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[966] | 91 | |
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[1055] | 92 | virtual G4double ComputeTruePathLengthLimit(const G4Track& track, |
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| 93 | G4PhysicsTable* theLambdaTable, |
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| 94 | G4double currentMinimalStep); |
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[966] | 95 | |
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[1055] | 96 | virtual G4double ComputeGeomPathLength(G4double truePathLength); |
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[966] | 97 | |
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[1055] | 98 | virtual G4double ComputeTrueStepLength(G4double geomStepLength); |
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[966] | 99 | |
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| 100 | private: |
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| 101 | |
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[1055] | 102 | G4double ComputeTransportXSectionPerAtom(); |
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[966] | 103 | |
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| 104 | G4double ComputeXSectionPerVolume(); |
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| 105 | |
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| 106 | void ComputeMaxElectronScattering(G4double cut); |
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| 107 | |
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| 108 | inline G4double GetLambda(G4double kinEnergy); |
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| 109 | |
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| 110 | inline void SetupParticle(const G4ParticleDefinition*); |
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| 111 | |
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| 112 | inline void SetupKinematic(G4double kinEnergy, G4double cut); |
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| 113 | |
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| 114 | inline void SetupTarget(G4double Z, G4double kinEnergy); |
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| 115 | |
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| 116 | inline void DefineMaterial(const G4MaterialCutsCouple*); |
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| 117 | |
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| 118 | // hide assignment operator |
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| 119 | G4WentzelVIModel & operator=(const G4WentzelVIModel &right); |
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| 120 | G4WentzelVIModel(const G4WentzelVIModel&); |
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| 121 | |
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| 122 | const G4ParticleDefinition* theProton; |
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| 123 | const G4ParticleDefinition* theElectron; |
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| 124 | const G4ParticleDefinition* thePositron; |
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| 125 | |
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| 126 | G4ParticleChangeForMSC* fParticleChange; |
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| 127 | |
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| 128 | G4PhysicsTable* theLambdaTable; |
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| 129 | G4PhysicsTable* theLambda2Table; |
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| 130 | G4LossTableManager* theManager; |
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| 131 | const G4DataVector* currentCuts; |
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| 132 | |
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| 133 | G4NistManager* fNistManager; |
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| 134 | |
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| 135 | G4double numlimit; |
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| 136 | G4double tlimitminfix; |
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| 137 | G4double invsqrt12; |
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| 138 | |
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| 139 | // cash |
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| 140 | G4double preKinEnergy; |
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| 141 | G4double ecut; |
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| 142 | G4double lambda0; |
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| 143 | G4double tPathLength; |
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| 144 | G4double zPathLength; |
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| 145 | G4double lambdaeff; |
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| 146 | G4double currentRange; |
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| 147 | G4double par1; |
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| 148 | G4double par2; |
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| 149 | G4double par3; |
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| 150 | |
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| 151 | G4double xtsec; |
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| 152 | std::vector<G4double> xsecn; |
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| 153 | std::vector<G4double> prob; |
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| 154 | G4int nelments; |
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| 155 | |
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| 156 | G4int nbins; |
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| 157 | G4int nwarnings; |
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| 158 | G4int nwarnlimit; |
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| 159 | |
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| 160 | G4int currentMaterialIndex; |
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| 161 | |
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| 162 | const G4MaterialCutsCouple* currentCouple; |
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| 163 | const G4Material* currentMaterial; |
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| 164 | |
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| 165 | // single scattering parameters |
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| 166 | G4double coeff; |
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| 167 | G4double cosThetaMin; |
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| 168 | G4double cosThetaMax; |
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| 169 | G4double cosTetMaxNuc; |
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| 170 | G4double cosTetMaxNuc2; |
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| 171 | G4double cosTetMaxElec; |
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| 172 | G4double cosTetMaxElec2; |
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| 173 | G4double q2Limit; |
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| 174 | G4double alpha2; |
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| 175 | |
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| 176 | // projectile |
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| 177 | const G4ParticleDefinition* particle; |
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| 178 | |
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| 179 | G4double chargeSquare; |
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| 180 | G4double spin; |
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| 181 | G4double mass; |
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| 182 | G4double tkin; |
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| 183 | G4double mom2; |
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| 184 | G4double invbeta2; |
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[1055] | 185 | G4double kinFactor; |
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[966] | 186 | G4double etag; |
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| 187 | G4double lowEnergyLimit; |
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| 188 | |
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| 189 | // target |
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| 190 | G4double targetZ; |
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[1055] | 191 | G4double targetMass; |
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[966] | 192 | G4double screenZ; |
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| 193 | G4double formfactA; |
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[1055] | 194 | G4int iz; |
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[966] | 195 | |
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[1055] | 196 | static G4double ScreenRSquare[100]; |
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| 197 | static G4double FormFactor[100]; |
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| 198 | |
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[966] | 199 | // flags |
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| 200 | G4bool isInitialized; |
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| 201 | G4bool inside; |
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| 202 | }; |
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| 203 | |
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| 204 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 205 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 206 | |
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| 207 | inline |
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| 208 | void G4WentzelVIModel::DefineMaterial(const G4MaterialCutsCouple* cup) |
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| 209 | { |
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| 210 | if(cup != currentCouple) { |
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| 211 | currentCouple = cup; |
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| 212 | currentMaterial = cup->GetMaterial(); |
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| 213 | currentMaterialIndex = currentCouple->GetIndex(); |
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| 214 | } |
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| 215 | } |
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| 216 | |
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| 217 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 218 | |
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| 219 | inline |
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| 220 | G4double G4WentzelVIModel::GetLambda(G4double e) |
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| 221 | { |
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| 222 | G4double x; |
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| 223 | if(theLambdaTable) { |
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| 224 | G4bool b; |
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| 225 | x = ((*theLambdaTable)[currentMaterialIndex])->GetValue(e, b); |
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| 226 | } else { |
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| 227 | x = CrossSection(currentCouple,particle,e, |
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| 228 | (*currentCuts)[currentMaterialIndex]); |
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| 229 | } |
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| 230 | if(x > DBL_MIN) x = 1./x; |
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| 231 | else x = DBL_MAX; |
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| 232 | return x; |
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| 233 | } |
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| 234 | |
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| 235 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 236 | |
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[1055] | 237 | inline void G4WentzelVIModel::SetupParticle(const G4ParticleDefinition* p) |
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[966] | 238 | { |
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| 239 | // Initialise mass and charge |
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| 240 | if(p != particle) { |
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| 241 | particle = p; |
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| 242 | mass = particle->GetPDGMass(); |
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| 243 | spin = particle->GetPDGSpin(); |
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| 244 | G4double q = particle->GetPDGCharge()/eplus; |
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| 245 | chargeSquare = q*q; |
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| 246 | tkin = 0.0; |
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| 247 | } |
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| 248 | } |
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| 249 | |
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| 250 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 251 | |
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| 252 | inline void G4WentzelVIModel::SetupKinematic(G4double ekin, G4double cut) |
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| 253 | { |
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| 254 | if(ekin != tkin || ecut != cut) { |
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| 255 | tkin = ekin; |
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| 256 | mom2 = tkin*(tkin + 2.0*mass); |
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| 257 | invbeta2 = 1.0 + mass*mass/mom2; |
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| 258 | cosTetMaxNuc = cosThetaMax; |
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[1055] | 259 | if(mass < MeV && ekin <= 10.*cut) { |
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[966] | 260 | cosTetMaxNuc = ekin*(cosThetaMax + 1.0)/(10.*cut) - 1.0; |
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| 261 | } |
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| 262 | ComputeMaxElectronScattering(cut); |
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| 263 | } |
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| 264 | } |
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| 265 | |
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| 266 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 267 | |
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| 268 | inline void G4WentzelVIModel::SetupTarget(G4double Z, G4double e) |
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| 269 | { |
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| 270 | if(Z != targetZ || e != etag) { |
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| 271 | etag = e; |
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| 272 | targetZ = Z; |
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[1055] | 273 | iz = G4int(Z); |
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[966] | 274 | if(iz > 99) iz = 99; |
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[1055] | 275 | targetMass = fNistManager->GetAtomicMassAmu(iz)*amu_c2; |
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| 276 | G4double m12 = mass*mass; |
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| 277 | G4double x = 1.0 + mass/targetMass; |
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| 278 | kinFactor = coeff*targetZ*chargeSquare*(1.0 + m12/mom2)/mom2; |
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| 279 | screenZ = ScreenRSquare[iz]/mom2; |
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| 280 | if(iz > 1) { |
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| 281 | screenZ *=(1.13 + 3.76*Z*Z*alpha2); |
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| 282 | kinFactor /= (x*x); |
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[966] | 283 | } |
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[1055] | 284 | //if(iz > 1) screenZ *=(1.13 + std::min(0.5,3.76*Z*Z*invbeta2*alpha2)); |
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| 285 | formfactA = FormFactor[iz]*mom2; |
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[966] | 286 | cosTetMaxNuc2 = cosTetMaxNuc; |
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| 287 | cosTetMaxElec2 = cosTetMaxElec; |
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| 288 | } |
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| 289 | } |
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| 290 | |
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| 291 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 292 | |
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| 293 | #endif |
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| 294 | |
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