include/Geant4/G4NeutronElectronElModel.hh

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0025 //
0026 //
0027 //
0028 // Geant4 Header : G4NeutronElectronElModel
0029 //
0030 // 16.5.17 V.Grichine
0031 //
0032 // Modified:
0033 //
0034 // Class Description
0035 // Default model for neutron-electron elastic  scattering;
0036 // Class Description - End
0037
0038 #ifndef G4NeutronElectronElModel_h
0039 #define G4NeutronElectronElModel_h 1
0040
0041 #include "globals.hh"
0042 #include "G4HadronElastic.hh"
0043 #include "G4HadProjectile.hh"
0044 #include "G4Nucleus.hh"
0045 #include "G4NucleiProperties.hh"
0046
0047 class G4ParticleDefinition;
0048 class G4PhysicsLogVector;
0049 class G4PhysicsTable;
0050
0051 class G4NeutronElectronElModel : public G4HadronElastic
0052 {
0053 public:
0054
0055   G4NeutronElectronElModel(const G4String& name = "n-e-elastic");
0056
0057   virtual ~G4NeutronElectronElModel();
0058
0059   virtual G4bool IsApplicable(const G4HadProjectile & aTrack,
0060                   G4Nucleus & targetNucleus);
0061
0062   virtual G4HadFinalState * ApplyYourself(const G4HadProjectile & aTrack,
0063                       G4Nucleus & targetNucleus);
0064
0065   void Initialise();
0066
0067   G4double XscIntegrand(G4double x);
0068
0069   G4double CalculateAm( G4double momentum);
0070
0071   inline G4double GetAm(){return fAm;};
0072
0073
0074   // sample recoil electron energy in lab frame
0075
0076   G4double SampleSin2HalfTheta(G4double Tkin);
0077   G4double GetTransfer( G4int iTkin, G4int iTransfer, G4double position );
0078
0079   void SetCutEnergy(G4double ec){fCutEnergy=ec;};
0080   G4double GetCutEnergy(){return fCutEnergy;};
0081
0082
0083
0084   virtual void ModelDescription(std::ostream&) const;
0085
0086 private:
0087
0088   G4double fAm, fM, fM2, fMv2, fme, fme2, fee, fee2;
0089   G4double fMinEnergy, fMaxEnergy;
0090   G4int fEnergyBin, fAngleBin;
0091   G4ParticleDefinition* theElectron;
0092   G4double fCutEnergy; // minimal recoil electron energy detected
0093   G4PhysicsLogVector* fEnergyVector;
0094   G4PhysicsTable* fAngleTable;
0095 };
0096
0097 ////////////////////////////////////////////////////////////////////
0098 //
0099 // return Wentzel atom screening correction for neutron-electron scattering
0100
0101 inline  G4double G4NeutronElectronElModel::CalculateAm( G4double Tkin)
0102 {
0103   fee      = (Tkin+fM)*fme/fM;
0104     // G4cout<<"fee = "<<fee<<" MeV"<<G4endl;
0105   fee2     = fee*fee;
0106   G4double   momentum = std::sqrt( fee2 - fme2 );
0107   G4double k   = momentum/CLHEP::hbarc;
0108   G4double ch  = 1.13;
0109   G4double zn  = 1.77*k*CLHEP::Bohr_radius;
0110   G4double zn2 = zn*zn;
0111   fAm          = ch/zn2;
0112
0113   return fAm;
0114 }
0115
0116
0117 #endif