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25 // 25 //
26 // G4ScreeningMottCrossSection.hh 26 // G4ScreeningMottCrossSection.hh
27 //-------------------------------------------- 27 //-------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class header file 29 // GEANT4 Class header file
30 // 30 //
31 // File name: G4ScreeningMottCrossSection 31 // File name: G4ScreeningMottCrossSection
32 // 32 //
33 // Author: Cristina Consolandi 33 // Author: Cristina Consolandi
34 // 34 //
35 // Creation date: 20.10.2011 35 // Creation date: 20.10.2011
36 // 36 //
37 // Modifications: 37 // Modifications:
38 // 38 //
39 // Class Description: 39 // Class Description:
40 // Computation of electron Coulomb Scatte 40 // Computation of electron Coulomb Scattering Cross Section.
41 // Suitable for high energy electrons and 41 // Suitable for high energy electrons and light target materials.
42 // 42 //
43 // Reference: 43 // Reference:
44 // M.J. Boschini et al. 44 // M.J. Boschini et al.
45 // "Non Ionizing Energy Loss induced by El 45 // "Non Ionizing Energy Loss induced by Electrons in the Space Environment"
46 // Proc. of the 13th Int. Conf. on Partic 46 // Proc. of the 13th Int. Conf. on Particle Physics and Advanced Technology
47 // (13th ICPPAT, Como 3-7/10/2011), World 47 // (13th ICPPAT, Como 3-7/10/2011), World Scientific (Singapore).
48 // Available at: http://arxiv.org/abs/111 48 // Available at: http://arxiv.org/abs/1111.4042v4
49 // 49 //
50 // 1) Mott Differential Cross Section App 50 // 1) Mott Differential Cross Section Approximation:
51 // For Target material up to Z=92 (U): 51 // For Target material up to Z=92 (U):
52 // As described in http://arxiv.org/ab 52 // As described in http://arxiv.org/abs/1111.4042v4
53 // par. 2.1 , eq. (16)-(17) 53 // par. 2.1 , eq. (16)-(17)
54 // Else (Z>92): 54 // Else (Z>92):
55 // W. A. McKinley and H. Fashbach, Phy 55 // W. A. McKinley and H. Fashbach, Phys. Rev. 74, (1948) 1759.
56 // 2) Screening coefficient: 56 // 2) Screening coefficient:
57 // vomn G. Moliere, Z. Naturforsh A2 (194 57 // vomn G. Moliere, Z. Naturforsh A2 (1947), 133-145; A3 (1948), 78.
58 // 3) Nuclear Form Factor: 58 // 3) Nuclear Form Factor:
59 // A.V. Butkevich et al. Nucl. Instr. Met 59 // A.V. Butkevich et al. Nucl. Instr. Meth. A488 (2002), 282-294.
60 // 60 //
61 // ------------------------------------------- 61 // -----------------------------------------------------------------------------
62 62
63 // 63 //
64 #ifndef G4ScreeningMottCrossSection_h 64 #ifndef G4ScreeningMottCrossSection_h
65 #define G4ScreeningMottCrossSection_h 1 65 #define G4ScreeningMottCrossSection_h 1
66 66
67 //....oooOO0OOooo........oooOO0OOooo........oo 67 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
68 68
69 #include "globals.hh" 69 #include "globals.hh"
70 #include "G4ParticleDefinition.hh" 70 #include "G4ParticleDefinition.hh"
71 #include <vector> 71 #include <vector>
72 72
73 //....oooOO0OOooo........oooOO0OOooo........oo 73 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
74 74
75 static const G4int DIMMOTT = 750; 75 static const G4int DIMMOTT = 750;
76 76
77 class G4NistManager; 77 class G4NistManager;
78 class G4Pow; 78 class G4Pow;
79 79
80 class G4ScreeningMottCrossSection 80 class G4ScreeningMottCrossSection
81 { 81 {
82 82
83 public: 83 public:
84 84
85 explicit G4ScreeningMottCrossSection(); 85 explicit G4ScreeningMottCrossSection();
86 86
87 ~G4ScreeningMottCrossSection(); 87 ~G4ScreeningMottCrossSection();
88 88
89 void Initialise(const G4ParticleDefinition*, 89 void Initialise(const G4ParticleDefinition*, G4double cosThetaLim);
90 90
91 void SetupKinematic(G4double kinEnergy, G4in 91 void SetupKinematic(G4double kinEnergy, G4int Z);
92 92
93 G4double NuclearCrossSection(G4int form, G4i 93 G4double NuclearCrossSection(G4int form, G4int fast);
94 G4double GetScatteringAngle(G4int form, G4in 94 G4double GetScatteringAngle(G4int form, G4int fast);
95 95
96 G4double RatioMottRutherford(G4double tet); 96 G4double RatioMottRutherford(G4double tet);
97 G4double RatioMottRutherfordCosT(G4double si 97 G4double RatioMottRutherfordCosT(G4double sin2t2);
98 98
99 G4double McFcorrection(G4double sin2t2); 99 G4double McFcorrection(G4double sin2t2);
100 inline void SetupParticle(const G4ParticleDe 100 inline void SetupParticle(const G4ParticleDefinition*);
101 101
102 G4ScreeningMottCrossSection & operator= <<
103 (const G4ScreeningMottCrossSection &right) = <<
104 G4ScreeningMottCrossSection(const G4Screenin <<
105 <<
106 private: 102 private:
107 103
108 G4double ComputeAngle(G4int idx, G4double& r 104 G4double ComputeAngle(G4int idx, G4double& rand);
109 105
110 G4double FormFactor2ExpHof(G4double sin2t2); 106 G4double FormFactor2ExpHof(G4double sin2t2);
111 G4double FormFactor2Gauss(G4double sin2t2); 107 G4double FormFactor2Gauss(G4double sin2t2);
112 G4double FormFactor2UniformHelm(G4double sin 108 G4double FormFactor2UniformHelm(G4double sin2t2);
113 G4double DifferentialXSection(G4int idx, G4i 109 G4double DifferentialXSection(G4int idx, G4int form);
114 110
115 G4double GetTransitionRandom(); 111 G4double GetTransitionRandom();
>> 112
>> 113 G4ScreeningMottCrossSection & operator=
>> 114 (const G4ScreeningMottCrossSection &right);
>> 115 G4ScreeningMottCrossSection(const G4ScreeningMottCrossSection&);
116 116
117 G4NistManager* fNistManager; 117 G4NistManager* fNistManager;
118 G4Pow* fG4pow; 118 G4Pow* fG4pow;
119 119
120 const G4ParticleDefinition* particle; 120 const G4ParticleDefinition* particle;
121 121
122 G4double fTotalCross; 122 G4double fTotalCross;
123 //cost - min - max 123 //cost - min - max
124 G4double cosThetaMin;// def 1.0 124 G4double cosThetaMin;// def 1.0
125 G4double cosThetaMax;// def -1. 125 G4double cosThetaMax;// def -1.0
126 126
127 G4double cosTetMinNuc; 127 G4double cosTetMinNuc;
128 G4double cosTetMaxNuc; 128 G4double cosTetMaxNuc;
129 129
130 //energy cut 130 //energy cut
131 G4double ecut; 131 G4double ecut;
132 G4double etag; 132 G4double etag;
133 133
134 G4double spin; 134 G4double spin;
135 G4double mass; 135 G4double mass;
136 136
137 //lab of incedent particle 137 //lab of incedent particle
138 G4double tkinLab; 138 G4double tkinLab;
139 G4double momLab2; 139 G4double momLab2;
140 G4double invbetaLab2; 140 G4double invbetaLab2;
141 141
142 //relative system with nucleus 142 //relative system with nucleus
143 G4double mu_rel; 143 G4double mu_rel;
144 G4double tkin; 144 G4double tkin;
145 G4double mom2; 145 G4double mom2;
146 G4double invbeta2; 146 G4double invbeta2;
147 G4double beta; 147 G4double beta;
148 G4double gamma; 148 G4double gamma;
149 149
150 //constants 150 //constants
151 G4double alpha; 151 G4double alpha;
152 G4double htc2; 152 G4double htc2;
153 G4double e2; 153 G4double e2;
154 154
155 // target nucleus 155 // target nucleus
156 G4double targetMass; 156 G4double targetMass;
157 G4double As; 157 G4double As;
158 G4int targetZ; 158 G4int targetZ;
159 G4int targetA; 159 G4int targetA;
160 160
161 // working array 161 // working array
162 std::vector<G4double> cross; 162 std::vector<G4double> cross;
163 }; 163 };
164 164
165 165
166 //....oooOO0OOooo........oooOO0OOooo........oo 166 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
167 167
168 inline 168 inline
169 void G4ScreeningMottCrossSection::SetupParticl 169 void G4ScreeningMottCrossSection::SetupParticle(const G4ParticleDefinition* p)
170 { 170 {
171 particle = p; 171 particle = p;
172 mass = particle->GetPDGMass(); 172 mass = particle->GetPDGMass();
173 spin = particle->GetPDGSpin(); 173 spin = particle->GetPDGSpin();
174 if(0.0 != spin) { spin = 0.5; } 174 if(0.0 != spin) { spin = 0.5; }
175 tkin = 0.0; 175 tkin = 0.0;
176 } 176 }
177 177
178 //....oooOO0OOooo........oooOO0OOooo........oo 178 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
179 179
180 #endif 180 #endif
181 181