[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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[1340] | 26 | // $Id: G4eBremsstrahlungRelModel.hh,v 1.14 2010/10/26 10:35:22 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: emstand-V09-03-24 $ |
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[966] | 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: G4eBremsstrahlungRelModel |
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| 35 | // extention of standard G4eBremsstrahlungModel |
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| 36 | // |
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| 37 | // Author: Andreas Schaelicke |
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| 38 | // |
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| 39 | // Creation date: 28.03.2008 |
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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 energy loss for gamma emission by electrons and |
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| 47 | // positrons including an improved version of the LPM effect |
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| 48 | |
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| 49 | // ------------------------------------------------------------------- |
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| 50 | // |
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| 51 | |
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| 52 | #ifndef G4eBremsstrahlungRelModel_h |
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| 53 | #define G4eBremsstrahlungRelModel_h 1 |
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| 54 | |
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| 55 | #include "G4VEmModel.hh" |
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| 56 | #include "G4NistManager.hh" |
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| 57 | |
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| 58 | class G4ParticleChangeForLoss; |
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| 59 | class G4PhysicsVector; |
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| 60 | |
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| 61 | class G4eBremsstrahlungRelModel : public G4VEmModel |
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| 62 | { |
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| 63 | |
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| 64 | public: |
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| 65 | |
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| 66 | G4eBremsstrahlungRelModel(const G4ParticleDefinition* p = 0, |
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[1340] | 67 | const G4String& nam = "eBremLPM"); |
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[966] | 68 | |
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| 69 | virtual ~G4eBremsstrahlungRelModel(); |
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| 70 | |
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| 71 | virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&); |
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| 72 | |
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[1055] | 73 | virtual G4double MinEnergyCut(const G4ParticleDefinition*, |
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| 74 | const G4MaterialCutsCouple*); |
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[966] | 75 | |
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| 76 | virtual G4double ComputeDEDXPerVolume(const G4Material*, |
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| 77 | const G4ParticleDefinition*, |
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| 78 | G4double kineticEnergy, |
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| 79 | G4double cutEnergy); |
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| 80 | |
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| 81 | virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*, |
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| 82 | G4double tkin, |
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| 83 | G4double Z, G4double, |
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| 84 | G4double cutEnergy, |
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| 85 | G4double maxEnergy = DBL_MAX); |
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| 86 | |
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| 87 | virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*, |
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| 88 | const G4MaterialCutsCouple*, |
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| 89 | const G4DynamicParticle*, |
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| 90 | G4double cutEnergy, |
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| 91 | G4double maxEnergy); |
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| 92 | |
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| 93 | virtual void SetupForMaterial(const G4ParticleDefinition*, |
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| 94 | const G4Material*,G4double); |
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| 95 | |
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| 96 | inline void SetLPMconstant(G4double val); |
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| 97 | inline G4double LPMconstant() const; |
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| 98 | |
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| 99 | private: |
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| 100 | |
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| 101 | void InitialiseConstants(); |
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| 102 | |
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| 103 | void CalcLPMFunctions(G4double gammaEnergy); |
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| 104 | |
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| 105 | G4double ComputeBremLoss(G4double cutEnergy); |
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| 106 | |
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| 107 | G4double ComputeXSectionPerAtom(G4double cutEnergy); |
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| 108 | |
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| 109 | G4double ComputeDXSectionPerAtom(G4double gammaEnergy); |
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| 110 | |
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| 111 | G4double ComputeRelDXSectionPerAtom(G4double gammaEnergy); |
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| 112 | |
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| 113 | void SetParticle(const G4ParticleDefinition* p); |
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| 114 | |
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| 115 | // * fast inline functions * |
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| 116 | inline void SetCurrentElement(const G4double); |
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| 117 | |
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| 118 | inline G4double Phi1(G4double,G4double); |
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| 119 | inline G4double Phi1M2(G4double,G4double); |
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| 120 | inline G4double Psi1(G4double,G4double); |
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| 121 | inline G4double Psi1M2(G4double,G4double); |
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| 122 | |
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| 123 | // hide assignment operator |
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| 124 | G4eBremsstrahlungRelModel & operator=(const G4eBremsstrahlungRelModel &right); |
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| 125 | G4eBremsstrahlungRelModel(const G4eBremsstrahlungRelModel&); |
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| 126 | |
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| 127 | protected: |
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| 128 | |
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| 129 | G4NistManager* nist; |
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| 130 | const G4ParticleDefinition* particle; |
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| 131 | G4ParticleDefinition* theGamma; |
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| 132 | G4ParticleChangeForLoss* fParticleChange; |
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| 133 | |
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| 134 | static const G4double xgi[8], wgi[8]; |
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| 135 | static const G4double Fel_light[5]; |
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| 136 | static const G4double Finel_light[5]; |
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| 137 | |
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| 138 | G4double minThreshold; |
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| 139 | |
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| 140 | // cash |
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| 141 | G4double particleMass; |
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| 142 | G4double kinEnergy; |
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| 143 | G4double totalEnergy; |
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| 144 | G4double currentZ; |
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| 145 | G4double z13, z23, lnZ; |
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| 146 | G4double Fel, Finel, fCoulomb, fMax; |
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| 147 | G4double densityFactor; |
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| 148 | G4double densityCorr; |
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| 149 | |
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| 150 | // LPM effect |
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| 151 | G4double lpmEnergy; |
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| 152 | G4PhysicsVector *fXiLPM, *fPhiLPM, *fGLPM; |
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| 153 | G4double xiLPM, phiLPM, gLPM; |
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| 154 | |
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| 155 | // critical gamma energies |
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| 156 | G4double klpm, kp; |
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| 157 | |
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| 158 | G4bool isElectron; |
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| 159 | |
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| 160 | private: |
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[1340] | 161 | |
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[966] | 162 | // consts |
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| 163 | G4double lowKinEnergy; |
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| 164 | G4double fMigdalConstant; |
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| 165 | G4double fLPMconstant; |
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| 166 | G4double bremFactor; |
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| 167 | G4double energyThresholdLPM; |
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| 168 | G4double facFel, facFinel; |
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| 169 | G4double preS1,logTwo; |
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| 170 | |
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| 171 | G4bool use_completescreening; |
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| 172 | |
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| 173 | G4bool isInitialised; |
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| 174 | }; |
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| 175 | |
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| 176 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 177 | |
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| 178 | inline void G4eBremsstrahlungRelModel::SetCurrentElement(const G4double Z) |
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| 179 | { |
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| 180 | if(Z != currentZ) { |
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| 181 | currentZ = Z; |
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| 182 | |
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| 183 | G4int iz = G4int(Z); |
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| 184 | z13 = nist->GetZ13(iz); |
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| 185 | z23 = z13*z13; |
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| 186 | lnZ = nist->GetLOGZ(iz); |
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| 187 | |
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| 188 | if (iz <= 4) { |
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| 189 | Fel = Fel_light[iz]; |
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| 190 | Finel = Finel_light[iz] ; |
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| 191 | } |
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| 192 | else { |
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| 193 | Fel = facFel - lnZ/3. ; |
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| 194 | Finel = facFinel - 2.*lnZ/3. ; |
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| 195 | } |
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| 196 | |
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[1340] | 197 | fCoulomb = GetCurrentElement()->GetfCoulomb(); |
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| 198 | fMax = Fel-fCoulomb + Finel/currentZ + (1.+1./currentZ)/12.; |
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[966] | 199 | } |
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| 200 | } |
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| 201 | |
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| 202 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 203 | |
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| 204 | |
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| 205 | inline G4double G4eBremsstrahlungRelModel::Phi1(G4double gg, G4double) |
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| 206 | { |
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| 207 | // Thomas-Fermi FF from Tsai, eq.(3.38) for Z>=5 |
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| 208 | return 20.863 - 2.*std::log(1. + sqr(0.55846*gg) ) |
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| 209 | - 4.*( 1. - 0.6*std::exp(-0.9*gg) - 0.4*std::exp(-1.5*gg) ); |
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| 210 | } |
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| 211 | |
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| 212 | inline G4double G4eBremsstrahlungRelModel::Phi1M2(G4double gg, G4double) |
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| 213 | { |
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| 214 | // Thomas-Fermi FF from Tsai, eq. (3.39) for Z>=5 |
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| 215 | // return Phi1(gg,Z) - |
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| 216 | return 2./(3.*(1. + 6.5*gg +6.*gg*gg) ); |
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| 217 | } |
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| 218 | |
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| 219 | inline G4double G4eBremsstrahlungRelModel::Psi1(G4double eps, G4double) |
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| 220 | { |
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| 221 | // Thomas-Fermi FF from Tsai, eq.(3.40) for Z>=5 |
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| 222 | return 28.340 - 2.*std::log(1. + sqr(3.621*eps) ) |
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| 223 | - 4.*( 1. - 0.7*std::exp(-8*eps) - 0.3*std::exp(-29.*eps) ); |
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| 224 | } |
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| 225 | |
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| 226 | inline G4double G4eBremsstrahlungRelModel::Psi1M2(G4double eps, G4double) |
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| 227 | { |
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| 228 | // Thomas-Fermi FF from Tsai, eq. (3.41) for Z>=5 |
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| 229 | return 2./(3.*(1. + 40.*eps +400.*eps*eps) ); |
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| 230 | } |
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| 231 | |
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| 232 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 233 | |
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| 234 | inline |
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| 235 | void G4eBremsstrahlungRelModel::SetLPMconstant(G4double val) |
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| 236 | { |
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| 237 | fLPMconstant = val; |
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| 238 | } |
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| 239 | |
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| 240 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 241 | |
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| 242 | inline |
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| 243 | G4double G4eBremsstrahlungRelModel::LPMconstant() const |
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| 244 | { |
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| 245 | return fLPMconstant; |
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| 246 | } |
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| 247 | |
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| 248 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 249 | |
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| 250 | |
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| 251 | #endif |
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