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25 //
26 //
27 //
28 // Geant4 Header : G4NeutronElectronElModel
29 //
30 // 16.5.17 V.Grichine
31 //
32 // Modified:
33 //
34 // Class Description
35 // Default model for neutron-electron elastic scattering;
36 // Class Description - End
37
38 #ifndef G4NeutronElectronElModel_h
39 #define G4NeutronElectronElModel_h 1
40
41 #include "globals.hh"
42 #include "G4HadronElastic.hh"
43 #include "G4HadProjectile.hh"
44 #include "G4Nucleus.hh"
45 #include "G4NucleiProperties.hh"
46
47 class G4ParticleDefinition;
48 class G4PhysicsLogVector;
49 class G4PhysicsTable;
50
51 class G4NeutronElectronElModel : public G4HadronElastic
52 {
53 public:
54
55 G4NeutronElectronElModel(const G4String& name = "n-e-elastic");
56
57 virtual ~G4NeutronElectronElModel();
58
59 virtual G4bool IsApplicable(const G4HadProjectile & aTrack,
60 G4Nucleus & targetNucleus);
61
62 virtual G4HadFinalState * ApplyYourself(const G4HadProjectile & aTrack,
63 G4Nucleus & targetNucleus);
64
65 void Initialise();
66
67 G4double XscIntegrand(G4double x);
68
69 G4double CalculateAm( G4double momentum);
70
71 inline G4double GetAm(){return fAm;};
72
73
74 // sample recoil electron energy in lab frame
75
76 G4double SampleSin2HalfTheta(G4double Tkin);
77 G4double GetTransfer( G4int iTkin, G4int iTransfer, G4double position );
78
79 void SetCutEnergy(G4double ec){fCutEnergy=ec;};
80 G4double GetCutEnergy(){return fCutEnergy;};
81
82
83
84 virtual void ModelDescription(std::ostream&) const;
85
86 private:
87
88 G4double fAm, fM, fM2, fMv2, fme, fme2, fee, fee2;
89 G4double fMinEnergy, fMaxEnergy;
90 G4int fEnergyBin, fAngleBin;
91 G4ParticleDefinition* theElectron;
92 G4double fCutEnergy; // minimal recoil electron energy detected
93 G4PhysicsLogVector* fEnergyVector;
94 G4PhysicsTable* fAngleTable;
95 };
96
97 ////////////////////////////////////////////////////////////////////
98 //
99 // return Wentzel atom screening correction for neutron-electron scattering
100
101 inline G4double G4NeutronElectronElModel::CalculateAm( G4double Tkin)
102 {
103 fee = (Tkin+fM)*fme/fM;
104 // G4cout<<"fee = "<<fee<<" MeV"<<G4endl;
105 fee2 = fee*fee;
106 G4double momentum = std::sqrt( fee2 - fme2 );
107 G4double k = momentum/CLHEP::hbarc;
108 G4double ch = 1.13;
109 G4double zn = 1.77*k*CLHEP::Bohr_radius;
110 G4double zn2 = zn*zn;
111 fAm = ch/zn2;
112
113 return fAm;
114 }
115
116
117 #endif
118