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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 using namespace std;
>> 42 using namespace CLHEP;
>> 43
41 // class G4ParticleDefinition; 44 // class G4ParticleDefinition;
42 class G4PhysicsLogVector; 45 class G4PhysicsLogVector;
43 class G4PhysicsTable; 46 class G4PhysicsTable;
44 47
45 class G4NeutronElectronElXsc : public G4VCross 48 class G4NeutronElectronElXsc : public G4VCrossSectionDataSet
46 { 49 {
47 public: 50 public:
48 51
49 G4NeutronElectronElXsc(); 52 G4NeutronElectronElXsc();
50 ~G4NeutronElectronElXsc(); 53 ~G4NeutronElectronElXsc();
51 54
52 void Initialise(); 55 void Initialise();
53 56
54 virtual 57 virtual
55 G4bool IsElementApplicable(const G4DynamicPa 58 G4bool IsElementApplicable(const G4DynamicParticle*, G4int Z, const G4Material*);
56 59
57 60
58 virtual 61 virtual
59 G4double GetElementCrossSection(const G4Dyna 62 G4double GetElementCrossSection(const G4DynamicParticle*,
60 G4int Z, const G4Material*); 63 G4int Z, const G4Material*);
61 64
62 G4double GetRosenbluthXsc(const G4DynamicPar 65 G4double GetRosenbluthXsc(const G4DynamicParticle*,
63 G4int Z, const G4Material*); 66 G4int Z, const G4Material*);
64 67
65 G4double XscIntegrand(G4double x); 68 G4double XscIntegrand(G4double x);
66 69
67 G4double GetElementNonRelXsc(const G4Dynami 70 G4double GetElementNonRelXsc(const G4DynamicParticle*,
68 G4int Z, const G4Material*); 71 G4int Z, const G4Material*);
69 72
70 G4double CalculateAm( G4double momentum); 73 G4double CalculateAm( G4double momentum);
71 74
72 inline G4double GetAm(){return fAm;}; 75 inline G4double GetAm(){return fAm;};
73 76
74 void SetCutEnergy(G4double ec){fCutEnergy=ec 77 void SetCutEnergy(G4double ec){fCutEnergy=ec;};
75 G4double GetCutEnergy(){return fCutEnergy;}; 78 G4double GetCutEnergy(){return fCutEnergy;};
76 79
77 void SetBiasingFactor(G4double bf){fBiasingF 80 void SetBiasingFactor(G4double bf){fBiasingFactor=bf;};
78 81
79 protected: 82 protected:
80 G4double fM, fM2, fMv2, fme, fme2, fee, fee2 83 G4double fM, fM2, fMv2, fme, fme2, fee, fee2;
81 G4double fCofXsc; // 84 G4double fCofXsc; //
82 G4double fAm; // 85 G4double fAm; //
83 G4int fEnergyBin; 86 G4int fEnergyBin;
84 G4double fMinEnergy, fMaxEnergy, fCutEnergy; 87 G4double fMinEnergy, fMaxEnergy, fCutEnergy; // minimal recoil electron energy detected
85 G4double fBiasingFactor; // biasing xsc up 88 G4double fBiasingFactor; // biasing xsc up
86 89
87 G4PhysicsLogVector* fEnergyXscVector; 90 G4PhysicsLogVector* fEnergyXscVector;
88 static const G4double fXscArray[200]; 91 static const G4double fXscArray[200];
89 }; 92 };
90 93
91 94
92 95
93 ////////////////////////////////////////////// 96 ////////////////////////////////////////////////////////////////////
94 // 97 //
95 // return Wentzel atom screening correction fo 98 // return Wentzel atom screening correction for neutron-electron scattering
96 99
97 inline G4double G4NeutronElectronElXsc::Calcu 100 inline G4double G4NeutronElectronElXsc::CalculateAm( G4double momentum)
98 { 101 {
99 G4double k = momentum/CLHEP::hbarc; 102 G4double k = momentum/CLHEP::hbarc;
100 G4double ch = 1.13; 103 G4double ch = 1.13;
101 G4double zn = 1.77*k*CLHEP::Bohr_radius; 104 G4double zn = 1.77*k*CLHEP::Bohr_radius;
102 G4double zn2 = zn*zn; 105 G4double zn2 = zn*zn;
103 fAm = ch/zn2; 106 fAm = ch/zn2;
104 107
105 return fAm; 108 return fAm;
106 } 109 }
107 110
108 ////////////////////////////////////////////// 111 ////////////////////////////////////////////////////
109 // 112 //
110 // Slow electron (Tkin << me_c2) in the neutro 113 // Slow electron (Tkin << me_c2) in the neutron rest frame
111 114
112 inline G4double G4NeutronElectronElXsc:: 115 inline G4double G4NeutronElectronElXsc::
113 GetElementNonRelXsc(const G4DynamicParticle* a 116 GetElementNonRelXsc(const G4DynamicParticle* aPart, G4int ZZ,
114 const G4Material*) 117 const G4Material*)
115 { 118 {
116 G4double result(0.), te(0.), momentum(0.); 119 G4double result(0.), te(0.), momentum(0.);
117 120
118 te = aPart->GetKineticEnergy()*fme/fM; 121 te = aPart->GetKineticEnergy()*fme/fM;
119 momentum = std::sqrt( te*(te + 2.*fme) ); << 122 momentum = sqrt( te*(te + 2.*fme) );
120 fAm = CalculateAm(momentum); 123 fAm = CalculateAm(momentum);
121 124
122 result = 1. + std::log(1. +1./fAm); << 125 result = 1. + log(1. +1./fAm);
123 result *= fCofXsc; //*energy; 126 result *= fCofXsc; //*energy;
124 result *= ZZ; // incoherent sum over all e 127 result *= ZZ; // incoherent sum over all element electrons
125 128
126 return result; 129 return result;
127 } 130 }
128 131
129 #endif 132 #endif
130 133