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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 // 27-05-2012 Added Analytic Fitting to the Mott Cross Section by means of G4MottCoefficients class.
>> 39 //
38 // 40 //
39 // Class Description: 41 // Class Description:
40 // Computation of electron Coulomb Scatte 42 // Computation of electron Coulomb Scattering Cross Section.
41 // Suitable for high energy electrons and << 43 // Suitable for high energy electrons and light target materials.
42 // 44 //
43 // Reference: 45 // Reference:
44 // M.J. Boschini et al. 46 // M.J. Boschini et al.
45 // "Non Ionizing Energy Loss induced by El 47 // "Non Ionizing Energy Loss induced by Electrons in the Space Environment"
46 // Proc. of the 13th Int. Conf. on Partic << 48 // Proc. of the 13th International Conference on Particle Physics and Advanced Technology
47 // (13th ICPPAT, Como 3-7/10/2011), World 49 // (13th ICPPAT, Como 3-7/10/2011), World Scientific (Singapore).
48 // Available at: http://arxiv.org/abs/111 50 // Available at: http://arxiv.org/abs/1111.4042v4
49 // 51 //
50 // 1) Mott Differential Cross Section App << 52 // 1) Mott Differential Cross Section Approximation:
51 // For Target material up to Z=92 (U): 53 // For Target material up to Z=92 (U):
52 // As described in http://arxiv.org/ab << 54 // As described in http://arxiv.org/abs/1111.4042v4
53 // par. 2.1 , eq. (16)-(17) 55 // par. 2.1 , eq. (16)-(17)
54 // Else (Z>92): 56 // Else (Z>92):
55 // W. A. McKinley and H. Fashbach, Phy 57 // W. A. McKinley and H. Fashbach, Phys. Rev. 74, (1948) 1759.
56 // 2) Screening coefficient: << 58 // 2) Screening coefficient:
57 // vomn G. Moliere, Z. Naturforsh A2 (194 59 // vomn G. Moliere, Z. Naturforsh A2 (1947), 133-145; A3 (1948), 78.
58 // 3) Nuclear Form Factor: << 60 // 3) Nuclear Form Factor:
59 // A.V. Butkevich et al. Nucl. Instr. Met << 61 // A.V. Butkevich et al. Nucl. Instr. and Meth. in Phys. Res. A 488 (2002), 282-294.
60 // 62 //
61 // ------------------------------------------- << 63 // ----------------------------------------------------------------------------------------
62 64
63 // 65 //
64 #ifndef G4ScreeningMottCrossSection_h 66 #ifndef G4ScreeningMottCrossSection_h
65 #define G4ScreeningMottCrossSection_h 1 67 #define G4ScreeningMottCrossSection_h 1
66 68
67 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
68 70
69 #include "globals.hh" <<
70 #include "G4ParticleDefinition.hh" <<
71 #include <vector> <<
72 71
73 //....oooOO0OOooo........oooOO0OOooo........oo << 72 #include "G4MottCoefficients.hh"
>> 73 #include "globals.hh"
>> 74 #include "G4Material.hh"
>> 75 #include "G4Element.hh"
>> 76 #include "G4ElementVector.hh"
>> 77 #include "G4NistManager.hh"
>> 78 #include "G4ThreeVector.hh"
>> 79 #include "G4Pow.hh"
>> 80 #include "G4LossTableManager.hh"
74 81
75 static const G4int DIMMOTT = 750; << 82 class G4ParticleDefinition;
76 83
77 class G4NistManager; << 84 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
78 class G4Pow; <<
79 85
80 class G4ScreeningMottCrossSection 86 class G4ScreeningMottCrossSection
81 { 87 {
82 88
83 public: 89 public:
84 90
85 explicit G4ScreeningMottCrossSection(); << 91 G4ScreeningMottCrossSection();
>> 92
>> 93 virtual ~G4ScreeningMottCrossSection();
>> 94
>> 95 void Initialise(const G4ParticleDefinition*, G4double cosThetaLim);
86 96
87 ~G4ScreeningMottCrossSection(); << 97 G4double GetScreeningAngle();
>> 98 void SetScreeningCoefficient();
88 99
89 void Initialise(const G4ParticleDefinition*, <<
90 100
91 void SetupKinematic(G4double kinEnergy, G4in << 101
>> 102 inline void SetupParticle(const G4ParticleDefinition*);
>> 103 void SetupKinematic(G4double kinEnergy ,G4double Z);
92 104
93 G4double NuclearCrossSection(G4int form, G4i << 105 G4double NuclearCrossSection();
94 G4double GetScatteringAngle(G4int form, G4in << 106 G4ThreeVector GetNewDirection();
95 107
96 G4double RatioMottRutherford(G4double tet); << 108 inline G4double GetMom2CM()const;
97 G4double RatioMottRutherfordCosT(G4double si << 109 inline G4double GetMom2Lab()const;
>> 110 inline G4double GetTrec() const;
>> 111 inline G4double GetScreeningCoefficient() const;
>> 112 inline G4double GetTotalCross() const;
98 113
99 G4double McFcorrection(G4double sin2t2); <<
100 inline void SetupParticle(const G4ParticleDe <<
101 114
102 G4ScreeningMottCrossSection & operator= << 115
103 (const G4ScreeningMottCrossSection &right) = << 116 G4double McFcorrection(G4double);
104 G4ScreeningMottCrossSection(const G4Screenin << 117 G4double RatioMottRutherford(G4double);//.....new
>> 118 G4double FormFactor2ExpHof(G4double);
>> 119 G4double GetScatteringAngle();
>> 120 G4double AngleDistribution(G4double);
>> 121
105 122
106 private: 123 private:
107 124
108 G4double ComputeAngle(G4int idx, G4double& r << 125 G4ScreeningMottCrossSection & operator=(const G4ScreeningMottCrossSection &right);
>> 126 G4ScreeningMottCrossSection(const G4ScreeningMottCrossSection&);
>> 127
>> 128
>> 129 G4NistManager* fNistManager;
>> 130 G4MottCoefficients * mottcoeff;
>> 131
>> 132 G4double TotalCross;
>> 133
>> 134 //cost - min - max
>> 135 G4double cosThetaMin;// def 1.0
>> 136 G4double cosThetaMax;// def -1.0
109 137
110 G4double FormFactor2ExpHof(G4double sin2t2); << 138 G4double cosTetMinNuc;
111 G4double FormFactor2Gauss(G4double sin2t2); << 139 G4double cosTetMaxNuc;
112 G4double FormFactor2UniformHelm(G4double sin << 140
113 G4double DifferentialXSection(G4int idx, G4i << 141
114 << 142 //energy cut
115 G4double GetTransitionRandom(); << 143 G4double ecut;
116 << 144 G4double etag;
117 G4NistManager* fNistManager; << 145
118 G4Pow* fG4pow; << 146 // projectile........................
119 << 147 const G4ParticleDefinition* particle;
120 const G4ParticleDefinition* particle; << 148
121 << 149 G4double spin;
122 G4double fTotalCross; << 150 G4double mass;
123 //cost - min - max << 151
124 G4double cosThetaMin;// def 1.0 << 152 //lab of incedent particle
125 G4double cosThetaMax;// def -1. << 153 G4double tkinLab;
126 << 154 G4double momLab2;
127 G4double cosTetMinNuc; << 155 G4double invbetaLab2;
128 G4double cosTetMaxNuc; << 156
129 << 157 //relative system with nucleus
130 //energy cut << 158 G4double mu_rel;
131 G4double ecut; << 159 G4double tkin;
132 G4double etag; << 160 G4double mom2;
133 << 161 G4double invbeta2;
134 G4double spin; << 162 G4double beta;
135 G4double mass; << 163 G4double gamma;
136 << 164
137 //lab of incedent particle << 165
138 G4double tkinLab; << 166 // target nucleus
139 G4double momLab2; << 167 G4double targetZ;
140 G4double invbetaLab2; << 168 G4double targetA;
141 << 169 G4double targetMass;
142 //relative system with nucleus << 170 G4double Trec;
143 G4double mu_rel; << 171 G4double As;
144 G4double tkin; << 172 G4double coeffb[5][6];
145 G4double mom2; << 173
146 G4double invbeta2; << 174 //constants
147 G4double beta; << 175 G4double alpha;
148 G4double gamma; << 176 G4double htc2;
149 << 177 G4double e2;
150 //constants <<
151 G4double alpha; <<
152 G4double htc2; <<
153 G4double e2; <<
154 <<
155 // target nucleus <<
156 G4double targetMass; <<
157 G4double As; <<
158 G4int targetZ; <<
159 G4int targetA; <<
160 178
161 // working array <<
162 std::vector<G4double> cross; <<
163 }; 179 };
164 180
165 181
166 //....oooOO0OOooo........oooOO0OOooo........oo 182 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
167 183
168 inline << 184 inline void G4ScreeningMottCrossSection::SetupParticle(const G4ParticleDefinition* p)
169 void G4ScreeningMottCrossSection::SetupParticl <<
170 { 185 {
171 particle = p; << 186 particle = p;
172 mass = particle->GetPDGMass(); << 187 mass = particle->GetPDGMass();
173 spin = particle->GetPDGSpin(); << 188 spin = particle->GetPDGSpin();
174 if(0.0 != spin) { spin = 0.5; } << 189 if(0.0 != spin) { spin = 0.5; }
175 tkin = 0.0; << 190 tkin = 0.0;
>> 191 }
>> 192 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 193
>> 194
>> 195 inline G4double G4ScreeningMottCrossSection::GetMom2CM() const
>> 196 {
>> 197 return mom2;
>> 198 }
>> 199 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 200
>> 201
>> 202 inline G4double G4ScreeningMottCrossSection::GetMom2Lab() const
>> 203 {
>> 204 return momLab2;
>> 205 }
>> 206
>> 207
>> 208 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 209
>> 210 inline G4double G4ScreeningMottCrossSection::GetTrec() const
>> 211 {
>> 212 return Trec;
>> 213 }
>> 214
>> 215 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 216
>> 217 inline G4double G4ScreeningMottCrossSection::GetScreeningCoefficient() const
>> 218 {
>> 219 return As;
>> 220 }
>> 221
>> 222
>> 223 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 224
>> 225 inline G4double G4ScreeningMottCrossSection::GetTotalCross() const
>> 226 {
>> 227 return TotalCross;
176 } 228 }
177 229
178 //....oooOO0OOooo........oooOO0OOooo........oo 230 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
179 231
180 #endif 232 #endif
>> 233
>> 234
181 235