| 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // $Id: G4hBremsstrahlungModel.cc,v 1.3 2008/07/22 16:15:16 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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| 28 | // |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // |
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| 31 | // GEANT4 Class file |
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| 32 | // |
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| 33 | // |
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| 34 | // File name: G4hBremsstrahlungModel |
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| 35 | // |
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| 36 | // Author: Vladimir Ivanchenko on base of G4MuBremsstrahlungModel |
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| 37 | // |
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| 38 | // Creation date: 28.02.2008 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // |
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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 | // |
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| 47 | // ------------------------------------------------------------------- |
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| 48 | // |
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| 49 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 50 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 51 | |
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| 52 | #include "G4hBremsstrahlungModel.hh" |
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| 53 | |
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| 54 | using namespace std; |
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| 55 | |
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| 56 | G4hBremsstrahlungModel::G4hBremsstrahlungModel(const G4ParticleDefinition* p, |
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| 57 | const G4String& nam) |
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| 58 | : G4MuBremsstrahlungModel(p, nam) |
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| 59 | {} |
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| 60 | |
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| 61 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 62 | |
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| 63 | G4hBremsstrahlungModel::~G4hBremsstrahlungModel() |
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| 64 | {} |
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| 65 | |
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| 66 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 67 | |
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| 68 | G4double G4hBremsstrahlungModel::ComputeDMicroscopicCrossSection( |
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| 69 | G4double tkin, |
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| 70 | G4double Z, |
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| 71 | G4double gammaEnergy) |
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| 72 | // differential cross section |
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| 73 | { |
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| 74 | G4double dxsection = 0.; |
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| 75 | |
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| 76 | if( gammaEnergy > tkin) return dxsection ; |
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| 77 | // G4cout << "G4hBremsstrahlungModel m= " << mass |
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| 78 | // << " " << particle->GetParticleName() << G4endl; |
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| 79 | G4double E = tkin + mass ; |
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| 80 | G4double v = gammaEnergy/E ; |
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| 81 | G4double delta = 0.5*mass*mass*v/(E-gammaEnergy) ; |
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| 82 | G4double rab0=delta*sqrte ; |
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| 83 | |
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| 84 | G4int iz = G4int(Z); |
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| 85 | if(iz < 1) iz = 1; |
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| 86 | |
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| 87 | G4double z13 = 1.0/nist->GetZ13(iz); |
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| 88 | G4double dn = mass*nist->GetA27(iz)/(70.*MeV); |
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| 89 | |
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| 90 | G4double b = btf; |
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| 91 | if(1 == iz) b = bh; |
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| 92 | |
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| 93 | // nucleus contribution logarithm |
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| 94 | G4double rab1=b*z13; |
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| 95 | G4double fn=log(rab1/(dn*(electron_mass_c2+rab0*rab1))* |
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| 96 | (mass+delta*(dn*sqrte-2.))) ; |
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| 97 | if(fn <0.) fn = 0. ; |
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| 98 | |
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| 99 | G4double x = 1.0 - v; |
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| 100 | if(particle->GetPDGSpin() != 0) x += 0.75*v*v; |
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| 101 | |
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| 102 | dxsection = coeff*x*Z*Z*fn/gammaEnergy; |
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| 103 | |
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| 104 | return dxsection; |
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| 105 | } |
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| 106 | |
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| 107 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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