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25 // 25 //
26 // Neutron-electron elastic cross section base 26 // Neutron-electron elastic cross section base on the integration of
27 // the Rosenbluth differential xsc 27 // the Rosenbluth differential xsc
28 // 28 //
29 // 16.05.17 V. Grichine 29 // 16.05.17 V. Grichine
30 // 30 //
31 // 31 //
32 32
33 #ifndef G4NeutronElectronElXsc_h 33 #ifndef G4NeutronElectronElXsc_h
34 #define G4NeutronElectronElXsc_h 34 #define G4NeutronElectronElXsc_h
35 35
36 36
37 #include "globals.hh" 37 #include "globals.hh"
38 #include "G4VCrossSectionDataSet.hh" 38 #include "G4VCrossSectionDataSet.hh"
39 #include "G4DynamicParticle.hh" 39 #include "G4DynamicParticle.hh"
40 40
41 // class G4ParticleDefinition; 41 // class G4ParticleDefinition;
42 class G4PhysicsLogVector; 42 class G4PhysicsLogVector;
43 class G4PhysicsTable; 43 class G4PhysicsTable;
44 44
45 class G4NeutronElectronElXsc : public G4VCross 45 class G4NeutronElectronElXsc : public G4VCrossSectionDataSet
46 { 46 {
47 public: 47 public:
48 48
49 G4NeutronElectronElXsc(); 49 G4NeutronElectronElXsc();
50 ~G4NeutronElectronElXsc(); 50 ~G4NeutronElectronElXsc();
51 51
52 void Initialise(); 52 void Initialise();
53 53
54 virtual 54 virtual
55 G4bool IsElementApplicable(const G4DynamicPa 55 G4bool IsElementApplicable(const G4DynamicParticle*, G4int Z, const G4Material*);
56 56
57 57
58 virtual 58 virtual
59 G4double GetElementCrossSection(const G4Dyna 59 G4double GetElementCrossSection(const G4DynamicParticle*,
60 G4int Z, const G4Material*); 60 G4int Z, const G4Material*);
61 61
62 G4double GetRosenbluthXsc(const G4DynamicPar 62 G4double GetRosenbluthXsc(const G4DynamicParticle*,
63 G4int Z, const G4Material*); 63 G4int Z, const G4Material*);
64 64
65 G4double XscIntegrand(G4double x); 65 G4double XscIntegrand(G4double x);
66 66
67 G4double GetElementNonRelXsc(const G4Dynami 67 G4double GetElementNonRelXsc(const G4DynamicParticle*,
68 G4int Z, const G4Material*); 68 G4int Z, const G4Material*);
69 69
70 G4double CalculateAm( G4double momentum); 70 G4double CalculateAm( G4double momentum);
71 71
72 inline G4double GetAm(){return fAm;}; 72 inline G4double GetAm(){return fAm;};
73 73
74 void SetCutEnergy(G4double ec){fCutEnergy=ec 74 void SetCutEnergy(G4double ec){fCutEnergy=ec;};
75 G4double GetCutEnergy(){return fCutEnergy;}; 75 G4double GetCutEnergy(){return fCutEnergy;};
76 76
77 void SetBiasingFactor(G4double bf){fBiasingF 77 void SetBiasingFactor(G4double bf){fBiasingFactor=bf;};
78 78
79 protected: 79 protected:
80 G4double fM, fM2, fMv2, fme, fme2, fee, fee2 80 G4double fM, fM2, fMv2, fme, fme2, fee, fee2;
81 G4double fCofXsc; // 81 G4double fCofXsc; //
82 G4double fAm; // 82 G4double fAm; //
83 G4int fEnergyBin; 83 G4int fEnergyBin;
84 G4double fMinEnergy, fMaxEnergy, fCutEnergy; 84 G4double fMinEnergy, fMaxEnergy, fCutEnergy; // minimal recoil electron energy detected
85 G4double fBiasingFactor; // biasing xsc up 85 G4double fBiasingFactor; // biasing xsc up
86 86
87 G4PhysicsLogVector* fEnergyXscVector; 87 G4PhysicsLogVector* fEnergyXscVector;
88 static const G4double fXscArray[200]; 88 static const G4double fXscArray[200];
89 }; 89 };
90 90
91 91
92 92
93 ////////////////////////////////////////////// 93 ////////////////////////////////////////////////////////////////////
94 // 94 //
95 // return Wentzel atom screening correction fo 95 // return Wentzel atom screening correction for neutron-electron scattering
96 96
97 inline G4double G4NeutronElectronElXsc::Calcu 97 inline G4double G4NeutronElectronElXsc::CalculateAm( G4double momentum)
98 { 98 {
99 G4double k = momentum/CLHEP::hbarc; 99 G4double k = momentum/CLHEP::hbarc;
100 G4double ch = 1.13; 100 G4double ch = 1.13;
101 G4double zn = 1.77*k*CLHEP::Bohr_radius; 101 G4double zn = 1.77*k*CLHEP::Bohr_radius;
102 G4double zn2 = zn*zn; 102 G4double zn2 = zn*zn;
103 fAm = ch/zn2; 103 fAm = ch/zn2;
104 104
105 return fAm; 105 return fAm;
106 } 106 }
107 107
108 ////////////////////////////////////////////// 108 ////////////////////////////////////////////////////
109 // 109 //
110 // Slow electron (Tkin << me_c2) in the neutro 110 // Slow electron (Tkin << me_c2) in the neutron rest frame
111 111
112 inline G4double G4NeutronElectronElXsc:: 112 inline G4double G4NeutronElectronElXsc::
113 GetElementNonRelXsc(const G4DynamicParticle* a 113 GetElementNonRelXsc(const G4DynamicParticle* aPart, G4int ZZ,
114 const G4Material*) 114 const G4Material*)
115 { 115 {
116 G4double result(0.), te(0.), momentum(0.); 116 G4double result(0.), te(0.), momentum(0.);
117 117
118 te = aPart->GetKineticEnergy()*fme/fM; 118 te = aPart->GetKineticEnergy()*fme/fM;
119 momentum = std::sqrt( te*(te + 2.*fme) ); 119 momentum = std::sqrt( te*(te + 2.*fme) );
120 fAm = CalculateAm(momentum); 120 fAm = CalculateAm(momentum);
121 121
122 result = 1. + std::log(1. +1./fAm); 122 result = 1. + std::log(1. +1./fAm);
123 result *= fCofXsc; //*energy; 123 result *= fCofXsc; //*energy;
124 result *= ZZ; // incoherent sum over all e 124 result *= ZZ; // incoherent sum over all element electrons
125 125
126 return result; 126 return result;
127 } 127 }
128 128
129 #endif 129 #endif
130 130