| [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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| [1340] | 26 | // $Id: G4BetheHeitlerModel.hh,v 1.9 2010/10/26 10:35:22 vnivanch Exp $
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| 27 | // GEANT4 tag $Name: emstand-V09-03-24 $
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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: G4BetheHeitlerModel
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| 35 | //
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| 36 | // Author: Vladimir Ivanchenko on base of Michel Maire code
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| 37 | //
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| 38 | // Creation date: 19.04.2005
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| 39 | //
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| 40 | // Modifications:
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| 41 | // 02-02-06 Remove InitialiseCrossSectionPerAtom();
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| 42 | //
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| 43 | // Class Description:
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| 44 | //
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| 45 | // Implementation of gamma convertion to e+e- in the field of a nucleus
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| 46 | //
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| 47 |
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| 48 | // -------------------------------------------------------------------
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| 49 | //
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| 50 |
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| 51 | #ifndef G4BetheHeitlerModel_h
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| 52 | #define G4BetheHeitlerModel_h 1
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| 53 |
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| 54 | #include "G4VEmModel.hh"
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| 55 | #include "G4PhysicsTable.hh"
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| 56 |
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| 57 | class G4ParticleChangeForGamma;
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| 58 |
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| 59 | class G4BetheHeitlerModel : public G4VEmModel
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| 60 | {
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| 61 |
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| 62 | public:
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| 63 |
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| 64 | G4BetheHeitlerModel(const G4ParticleDefinition* p = 0,
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| [1340] | 65 | const G4String& nam = "BetheHeitler");
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| [819] | 66 |
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| 67 | virtual ~G4BetheHeitlerModel();
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| 68 |
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| 69 | virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
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| 70 |
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| 71 | virtual G4double ComputeCrossSectionPerAtom(
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| 72 | const G4ParticleDefinition*,
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| 73 | G4double kinEnergy,
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| 74 | G4double Z,
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| 75 | G4double A=0.,
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| 76 | G4double cut=0.,
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| 77 | G4double emax=DBL_MAX);
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| 78 |
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| 79 | virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
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| 80 | const G4MaterialCutsCouple*,
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| 81 | const G4DynamicParticle*,
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| 82 | G4double tmin,
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| 83 | G4double maxEnergy);
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| 84 |
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| 85 | private:
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| 86 |
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| 87 | G4double ScreenFunction1(G4double ScreenVariable);
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| 88 |
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| 89 | G4double ScreenFunction2(G4double ScreenVariable);
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| 90 |
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| 91 | // hide assignment operator
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| 92 | G4BetheHeitlerModel & operator=(const G4BetheHeitlerModel &right);
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| 93 | G4BetheHeitlerModel(const G4BetheHeitlerModel&);
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| 94 |
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| 95 | G4ParticleDefinition* theGamma;
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| 96 | G4ParticleDefinition* theElectron;
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| 97 | G4ParticleDefinition* thePositron;
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| 98 | G4ParticleChangeForGamma* fParticleChange;
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| 99 | };
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| 100 |
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| 101 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 102 |
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| 103 | inline G4double G4BetheHeitlerModel::ScreenFunction1(G4double ScreenVariable)
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| 104 |
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| 105 | // compute the value of the screening function 3*PHI1 - PHI2
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| 106 |
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| 107 | {
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| 108 | G4double screenVal;
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| 109 |
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| 110 | if (ScreenVariable > 1.)
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| 111 | screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952);
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| 112 | else
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| 113 | screenVal = 42.392 - ScreenVariable*(7.796 - 1.961*ScreenVariable);
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| 114 |
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| 115 | return screenVal;
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| 116 | }
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| 117 |
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| 118 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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| 119 |
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| 120 | inline G4double G4BetheHeitlerModel::ScreenFunction2(G4double ScreenVariable)
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| 121 |
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| 122 | // compute the value of the screening function 1.5*PHI1 - 0.5*PHI2
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| 123 |
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| 124 | {
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| 125 | G4double screenVal;
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| 126 |
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| 127 | if (ScreenVariable > 1.)
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| 128 | screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952);
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| 129 | else
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| 130 | screenVal = 41.405 - ScreenVariable*(5.828 - 0.8945*ScreenVariable);
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| 131 |
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| 132 | return screenVal;
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| 133 | }
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| 134 |
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| 135 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 136 |
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| 137 | #endif
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