standard/include/G4eeToTwoGammaModel.hh

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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 on fly
0048 // Annihilation at rest is sampled by G4VPositronAtRestModel
0049 //
0050 // -------------------------------------------------------------------
0051 //
0052
0053 #ifndef G4eeToTwoGammaModel_h
0054 #define G4eeToTwoGammaModel_h 1
0055
0056 #include "G4VEmModel.hh"
0057 #include <vector>
0058
0059 class G4ParticleChangeForGamma;
0060
0061 class G4eeToTwoGammaModel : public G4VEmModel
0062 {
0063
0064 public:
0065
0066   explicit G4eeToTwoGammaModel(const G4ParticleDefinition* p = nullptr,
0067                                const G4String& nam = "eplus2gg");
0068
0069   ~G4eeToTwoGammaModel() override;
0070
0071   void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
0072
0073   virtual G4double ComputeCrossSectionPerElectron(G4double kinEnergy);
0074
0075   G4double ComputeCrossSectionPerAtom(
0076                                  const G4ParticleDefinition*,
0077                                  G4double kinEnergy,
0078                                  G4double Z,
0079                                  G4double A = 0.,
0080                                  G4double cutEnergy = 0.,
0081                                  G4double maxEnergy = DBL_MAX) override;
0082
0083   G4double CrossSectionPerVolume(const G4Material*,
0084                  const G4ParticleDefinition*,
0085                  G4double kineticEnergy,
0086                  G4double cutEnergy = 0.0,
0087                  G4double maxEnergy = DBL_MAX) override;
0088
0089   void SampleSecondaries(std::vector<G4DynamicParticle*>*,
0090                  const G4MaterialCutsCouple*,
0091                  const G4DynamicParticle*,
0092                  G4double tmin,
0093                  G4double maxEnergy) override;
0094
0095   // hide assignment operator
0096   G4eeToTwoGammaModel & operator=(const  G4eeToTwoGammaModel &right) = delete;
0097   G4eeToTwoGammaModel(const  G4eeToTwoGammaModel&) = delete;
0098
0099 private:
0100
0101   G4double pi_rcl2;
0102   const G4ParticleDefinition* theGamma;
0103   G4ParticleChangeForGamma* fParticleChange;
0104 };
0105
0106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0107
0108 #endif