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G4NeutronElectronElXsc.hh
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25 //
26 // Neutron-electron elastic cross section base on the integration of
27 // the Rosenbluth differential xsc
28 //
29 // 16.05.17 V. Grichine
30 //
31 //
32 
33 #ifndef G4NeutronElectronElXsc_h
34 #define G4NeutronElectronElXsc_h
35 
36 
37 #include "globals.hh"
39 #include "G4DynamicParticle.hh"
40 
41 // class G4ParticleDefinition;
42 class G4PhysicsLogVector;
43 class G4PhysicsTable;
44 
46 {
47 public:
48 
51 
52  void Initialise();
53 
54  virtual
56 
57 
58  virtual
60  G4int Z, const G4Material*);
61 
63  G4int Z, const G4Material*);
64 
66 
68  G4int Z, const G4Material*);
69 
71 
72  inline G4double GetAm(){return fAm;};
73 
76 
78 
79 protected:
84  G4double fMinEnergy, fMaxEnergy, fCutEnergy; // minimal recoil electron energy detected
85  G4double fBiasingFactor; // biasing xsc up
86 
88  static const G4double fXscArray[200];
89 };
90 
91 
92 
94 //
95 // return Wentzel atom screening correction for neutron-electron scattering
96 
98 {
99  G4double k = momentum/CLHEP::hbarc;
100  G4double ch = 1.13;
101  G4double zn = 1.77*k*CLHEP::Bohr_radius;
102  G4double zn2 = zn*zn;
103  fAm = ch/zn2;
104 
105  return fAm;
106 }
107 
109 //
110 // Slow electron (Tkin << me_c2) in the neutron rest frame
111 
114  const G4Material*)
115 {
116  G4double result(0.), te(0.), momentum(0.);
117 
118  te = aPart->GetKineticEnergy()*fme/fM;
119  momentum = std::sqrt( te*(te + 2.*fme) );
120  fAm = CalculateAm(momentum);
121 
122  result = 1. + std::log(1. +1./fAm);
123  result *= fCofXsc; //*energy;
124  result *= ZZ; // incoherent sum over all element electrons
125 
126  return result;
127 }
128 
129 #endif