include/Geant4/G4eeToTwoGammaModel.hh

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
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0025 //
0026 //
0027 // -------------------------------------------------------------------
0028 //
0029 // GEANT4 Class header file
0030 //
0031 //
0032 // File name:     G4eeToTwoGammaModel
0033 //
0034 // Author:        Vladimir Ivanchenko on base of Michel Maire code
0035 //
0036 // Creation date: 02.08.2004
0037 //
0038 // Modifications:
0039 // 08-04-05 Major optimisation of internal interfaces (V.Ivanchenko)
0040 // 18-04-05 Compute CrossSectionPerVolume (V.Ivanchenko)
0041 // 06-02-06 ComputeCrossSectionPerElectron, ComputeCrossSectionPerAtom (mma)
0042 // 20-10-06 Add theGamma as a member (V.Ivanchenko)
0043 //
0044 //
0045 // Class Description:
0046 //
0047 // Implementation of e+ annihilation into 2 gamma
0048
0049 // -------------------------------------------------------------------
0050 //
0051
0052 #ifndef G4eeToTwoGammaModel_h
0053 #define G4eeToTwoGammaModel_h 1
0054
0055 #include "G4VEmModel.hh"
0056
0057 class G4ParticleChangeForGamma;
0058
0059 class G4eeToTwoGammaModel : public G4VEmModel
0060 {
0061
0062 public:
0063
0064   explicit G4eeToTwoGammaModel(const G4ParticleDefinition* p = nullptr,
0065                                const G4String& nam = "eplus2gg");
0066
0067   ~G4eeToTwoGammaModel() override;
0068
0069   void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
0070
0071   virtual G4double ComputeCrossSectionPerElectron(G4double kinEnergy);
0072
0073   G4double ComputeCrossSectionPerAtom(
0074                                  const G4ParticleDefinition*,
0075                                  G4double kinEnergy,
0076                                  G4double Z,
0077                                  G4double A = 0.,
0078                                  G4double cutEnergy = 0.,
0079                                  G4double maxEnergy = DBL_MAX) override;
0080
0081   G4double CrossSectionPerVolume(const G4Material*,
0082                  const G4ParticleDefinition*,
0083                  G4double kineticEnergy,
0084                  G4double cutEnergy = 0.0,
0085                  G4double maxEnergy = DBL_MAX) override;
0086
0087   void SampleSecondaries(std::vector<G4DynamicParticle*>*,
0088                  const G4MaterialCutsCouple*,
0089                  const G4DynamicParticle*,
0090                  G4double tmin,
0091                  G4double maxEnergy) override;
0092
0093   // hide assignment operator
0094   G4eeToTwoGammaModel & operator=(const  G4eeToTwoGammaModel &right) = delete;
0095   G4eeToTwoGammaModel(const  G4eeToTwoGammaModel&) = delete;
0096
0097 private:
0098
0099   G4double pi_rcl2;
0100   const G4ParticleDefinition* theGamma;
0101   G4ParticleChangeForGamma* fParticleChange;
0102
0103   static G4bool fSampleAtomicPDF;
0104 };
0105
0106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0107
0108 #endif