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: G4BetheHeitlerModel.hh,v 1.6 2007/05/22 17:34:36 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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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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65 | const G4String& nam = "Bethe-Heitler"); |
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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 | G4PhysicsTable* theCrossSectionTable; |
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100 | |
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101 | G4double lowGammaEnergy; |
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102 | G4double highGammaEnergy; |
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103 | |
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104 | G4int nbins; |
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105 | size_t indexZ[120]; |
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106 | |
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107 | }; |
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108 | |
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109 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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110 | |
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111 | inline G4double G4BetheHeitlerModel::ScreenFunction1(G4double ScreenVariable) |
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112 | |
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113 | // compute the value of the screening function 3*PHI1 - PHI2 |
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114 | |
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115 | { |
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116 | G4double screenVal; |
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117 | |
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118 | if (ScreenVariable > 1.) |
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119 | screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952); |
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120 | else |
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121 | screenVal = 42.392 - ScreenVariable*(7.796 - 1.961*ScreenVariable); |
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122 | |
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123 | return screenVal; |
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124 | } |
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125 | |
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126 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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127 | |
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128 | inline G4double G4BetheHeitlerModel::ScreenFunction2(G4double ScreenVariable) |
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129 | |
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130 | // compute the value of the screening function 1.5*PHI1 - 0.5*PHI2 |
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131 | |
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132 | { |
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133 | G4double screenVal; |
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134 | |
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135 | if (ScreenVariable > 1.) |
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136 | screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952); |
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137 | else |
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138 | screenVal = 41.405 - ScreenVariable*(5.828 - 0.8945*ScreenVariable); |
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139 | |
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140 | return screenVal; |
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141 | } |
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142 | |
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143 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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144 | |
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145 | #endif |
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