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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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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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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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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: geant4-09-03 $ |
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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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