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1 // 1
2 // *******************************************
3 // * License and Disclaimer
4 // *
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17 // *
18 // * This code implementation is the result
19 // * technical work of the GEANT4 collaboratio
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21 // * any work based on the software) you ag
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23 // * acceptance of all terms of the Geant4 Sof
24 // *******************************************
25 //
26 //
27 // -------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4eeToTwoGammaModel
33 //
34 // Author: Vladimir Ivanchenko on base
35 //
36 // Creation date: 02.08.2004
37 //
38 // Modifications:
39 // 08-04-05 Major optimisation of internal int
40 // 18-04-05 Compute CrossSectionPerVolume (V.I
41 // 06-02-06 ComputeCrossSectionPerElectron, Co
42 // 20-10-06 Add theGamma as a member (V.Ivanch
43 //
44 //
45 // Class Description:
46 //
47 // Implementation of e+ annihilation into 2 ga
48 // Annihilation at rest is sampled by G4VPosit
49 //
50 // -------------------------------------------
51 //
52
53 #ifndef G4eeToTwoGammaModel_h
54 #define G4eeToTwoGammaModel_h 1
55
56 #include "G4VEmModel.hh"
57 #include <vector>
58
59 class G4ParticleChangeForGamma;
60
61 class G4eeToTwoGammaModel : public G4VEmModel
62 {
63
64 public:
65
66 explicit G4eeToTwoGammaModel(const G4Particl
67 const G4String&
68
69 ~G4eeToTwoGammaModel() override;
70
71 void Initialise(const G4ParticleDefinition*,
72
73 virtual G4double ComputeCrossSectionPerElect
74
75 G4double ComputeCrossSectionPerAtom(
76 const G4Parti
77 G4double kinE
78 G4double Z,
79 G4double A =
80 G4double cutE
81 G4double maxE
82
83 G4double CrossSectionPerVolume(const G4Mater
84 const G4ParticleDefinition*,
85 G4double kineticEnergy,
86 G4double cutEnergy = 0.0,
87 G4double maxEnergy = DBL_MAX) overrid
88
89 void SampleSecondaries(std::vector<G4Dynamic
90 const G4MaterialCutsCouple*,
91 const G4DynamicParticle*,
92 G4double tmin,
93 G4double maxEnergy) override;
94
95 // hide assignment operator
96 G4eeToTwoGammaModel & operator=(const G4eeT
97 G4eeToTwoGammaModel(const G4eeToTwoGammaMod
98
99 private:
100
101 G4double pi_rcl2;
102 const G4ParticleDefinition* theGamma;
103 G4ParticleChangeForGamma* fParticleChange;
104 };
105
106 //....oooOO0OOooo........oooOO0OOooo........oo
107
108 #endif
109