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25 // 25 //
26 // 26 //
27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // 28 //
29 // 29 //
30 // GEANT4 Class header file 30 // GEANT4 Class header file
31 // 31 //
32 // 32 //
33 // File name: G4WentzelOKandVIxSection 33 // File name: G4WentzelOKandVIxSection
34 // 34 //
35 // Authors: V.Ivanchenko and O.Kadri 35 // Authors: V.Ivanchenko and O.Kadri
36 // 36 //
37 // Creation date: 21.05.2010 37 // Creation date: 21.05.2010
38 // 38 //
39 // Modifications: 39 // Modifications:
40 // 40 //
41 // 41 //
42 // Class Description: 42 // Class Description:
43 // 43 //
44 // Implementation of the computation of total 44 // Implementation of the computation of total and transport cross sections,
45 // sample scattering angle for the single scat 45 // sample scattering angle for the single scattering case.
46 // to be used by single and multiple scatterin 46 // to be used by single and multiple scattering models. References:
47 // 1) G.Wentzel, Z. Phys. 40 (1927) 590. 47 // 1) G.Wentzel, Z. Phys. 40 (1927) 590.
48 // 2) J.M. Fernandez-Varea et al., NIM B73 (19 48 // 2) J.M. Fernandez-Varea et al., NIM B73 (1993) 447.
49 // 49 //
50 // ------------------------------------------- 50 // -------------------------------------------------------------------
51 // 51 //
52 52
53 #ifndef G4WentzelOKandVIxSection_h 53 #ifndef G4WentzelOKandVIxSection_h
54 #define G4WentzelOKandVIxSection_h 1 54 #define G4WentzelOKandVIxSection_h 1
55 55
56 //....oooOO0OOooo........oooOO0OOooo........oo 56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57 57
58 #include "globals.hh" 58 #include "globals.hh"
59 #include "G4Material.hh" 59 #include "G4Material.hh"
60 #include "G4Element.hh" 60 #include "G4Element.hh"
61 #include "G4ElementVector.hh" 61 #include "G4ElementVector.hh"
62 #include "G4NistManager.hh" 62 #include "G4NistManager.hh"
63 #include "G4NuclearFormfactorType.hh" 63 #include "G4NuclearFormfactorType.hh"
64 #include "G4ThreeVector.hh" 64 #include "G4ThreeVector.hh"
65 #include "G4Pow.hh" 65 #include "G4Pow.hh"
66 66
67 class G4ParticleDefinition; 67 class G4ParticleDefinition;
68 class G4ScreeningMottCrossSection; 68 class G4ScreeningMottCrossSection;
69 69
70 //....oooOO0OOooo........oooOO0OOooo........oo 70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
71 71
72 class G4WentzelOKandVIxSection 72 class G4WentzelOKandVIxSection
73 { 73 {
74 74
75 public: 75 public:
76 76
77 explicit G4WentzelOKandVIxSection(G4bool com << 77 explicit G4WentzelOKandVIxSection(G4bool comb=true);
78 78
79 virtual ~G4WentzelOKandVIxSection(); 79 virtual ~G4WentzelOKandVIxSection();
80 80
81 void Initialise(const G4ParticleDefinition*, 81 void Initialise(const G4ParticleDefinition*, G4double CosThetaLim);
82 82
83 void SetupParticle(const G4ParticleDefinitio 83 void SetupParticle(const G4ParticleDefinition*);
84 84
85 // return cos(ThetaMax) for msc and cos(thet 85 // return cos(ThetaMax) for msc and cos(thetaMin) for single scattering
86 // cut = DBL_MAX means no scattering off ele 86 // cut = DBL_MAX means no scattering off electrons
87 virtual G4double SetupKinematic(G4double kin 87 virtual G4double SetupKinematic(G4double kinEnergy, const G4Material* mat);
88 G4double SetupTarget(G4int Z, G4double cut); 88 G4double SetupTarget(G4int Z, G4double cut);
89 89
90 G4double ComputeTransportCrossSectionPerAtom 90 G4double ComputeTransportCrossSectionPerAtom(G4double CosThetaMax);
91 91
92 G4ThreeVector& SampleSingleScattering(G4doub 92 G4ThreeVector& SampleSingleScattering(G4double CosThetaMin,
93 G4double CosThetaMax, 93 G4double CosThetaMax,
94 G4double elecRatio); 94 G4double elecRatio);
95 95
96 G4double ComputeSecondTransportMoment(G4doub 96 G4double ComputeSecondTransportMoment(G4double CosThetaMax);
97 97
98 inline G4double ComputeNuclearCrossSection(G 98 inline G4double ComputeNuclearCrossSection(G4double CosThetaMin,
99 G4double CosThetaMax); 99 G4double CosThetaMax);
100 100
101 inline G4double ComputeElectronCrossSection( 101 inline G4double ComputeElectronCrossSection(G4double CosThetaMin,
102 G4double CosThetaMax); 102 G4double CosThetaMax);
103 103
104 inline void SetTargetMass(G4double value); 104 inline void SetTargetMass(G4double value);
105 105
106 inline G4double GetMomentumSquare() const; 106 inline G4double GetMomentumSquare() const;
107 107
108 inline G4double GetCosThetaNuc() const; 108 inline G4double GetCosThetaNuc() const;
109 109
110 inline G4double GetCosThetaElec() const; 110 inline G4double GetCosThetaElec() const;
111 111
112 // hide assignment operator 112 // hide assignment operator
113 G4WentzelOKandVIxSection & operator= 113 G4WentzelOKandVIxSection & operator=
114 (const G4WentzelOKandVIxSection &right) = de 114 (const G4WentzelOKandVIxSection &right) = delete;
115 G4WentzelOKandVIxSection(const G4WentzelOKa 115 G4WentzelOKandVIxSection(const G4WentzelOKandVIxSection&) = delete;
116 116
117 protected: 117 protected:
118 118
119 void ComputeMaxElectronScattering(G4double c 119 void ComputeMaxElectronScattering(G4double cut);
120 120
121 void InitialiseA(); 121 void InitialiseA();
122 122
123 inline G4double FlatFormfactor(G4double x); 123 inline G4double FlatFormfactor(G4double x);
124 124
125 const G4ParticleDefinition* theProton; 125 const G4ParticleDefinition* theProton;
126 const G4ParticleDefinition* theElectron; 126 const G4ParticleDefinition* theElectron;
127 const G4ParticleDefinition* thePositron; 127 const G4ParticleDefinition* thePositron;
128 const G4ParticleDefinition* particle = nullp 128 const G4ParticleDefinition* particle = nullptr;
129 const G4Material* currentMaterial = nullptr; 129 const G4Material* currentMaterial = nullptr;
130 130
131 G4NistManager* fNistManager; 131 G4NistManager* fNistManager;
132 G4Pow* fG4pow; 132 G4Pow* fG4pow;
133 133
134 G4ScreeningMottCrossSection* fMottXSection = 134 G4ScreeningMottCrossSection* fMottXSection = nullptr;
135 135
136 G4ThreeVector temp; 136 G4ThreeVector temp;
137 137
138 // single scattering parameters 138 // single scattering parameters
139 G4double coeff; 139 G4double coeff;
140 G4double cosTetMaxElec = 1.0; 140 G4double cosTetMaxElec = 1.0;
141 G4double cosTetMaxNuc = 1.0; 141 G4double cosTetMaxNuc = 1.0;
142 << 142 G4double cosThetaMax = -1.0;
143 // for the combined mode it is cos(thetaMax) <<
144 // for single scattering it is cos(thetaMin) <<
145 G4double cosThetaMax = 1.0; <<
146 143
147 G4double chargeSquare = 0.0; 144 G4double chargeSquare = 0.0;
148 G4double charge3 = 0.0; 145 G4double charge3 = 0.0;
149 G4double spin = 0.0; 146 G4double spin = 0.0;
150 G4double mass = 0.0; 147 G4double mass = 0.0;
151 G4double tkin = 0.0; 148 G4double tkin = 0.0;
152 G4double mom2 = 0.0; 149 G4double mom2 = 0.0;
153 G4double momCM2 = 0.0; 150 G4double momCM2 = 0.0;
154 G4double invbeta2 = 1.0; 151 G4double invbeta2 = 1.0;
155 G4double kinFactor = 1.0; 152 G4double kinFactor = 1.0;
156 G4double etag = DBL_MAX; 153 G4double etag = DBL_MAX;
157 G4double ecut = DBL_MAX; 154 G4double ecut = DBL_MAX;
158 155
159 // target 156 // target
160 G4double targetMass; 157 G4double targetMass;
161 G4double screenZ = 0.0; 158 G4double screenZ = 0.0;
162 G4double formfactA = 0.0; 159 G4double formfactA = 0.0;
163 G4double factorA2 = 0.0; 160 G4double factorA2 = 0.0;
164 G4double factB = 0.0; 161 G4double factB = 0.0;
165 G4double factD = 0.0; 162 G4double factD = 0.0;
166 G4double fMottFactor = 1.0; 163 G4double fMottFactor = 1.0;
167 G4double gam0pcmp = 1.0; 164 G4double gam0pcmp = 1.0;
168 G4double pcmp2 = 1.0; 165 G4double pcmp2 = 1.0;
169 166
170 // integer parameters 167 // integer parameters
171 G4int targetZ = 0; 168 G4int targetZ = 0;
172 G4int nwarnings = 0; 169 G4int nwarnings = 0;
173 170
174 G4NuclearFormfactorType fNucFormfactor = fEx 171 G4NuclearFormfactorType fNucFormfactor = fExponentialNF;
175 172
176 G4bool isCombined; 173 G4bool isCombined;
177 174
178 static G4double ScreenRSquareElec[100]; 175 static G4double ScreenRSquareElec[100];
179 static G4double ScreenRSquare[100]; 176 static G4double ScreenRSquare[100];
180 static G4double FormFactor[100]; 177 static G4double FormFactor[100];
181 }; 178 };
182 179
183 //....oooOO0OOooo........oooOO0OOooo........oo 180 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
184 181
185 inline void G4WentzelOKandVIxSection::SetTarge 182 inline void G4WentzelOKandVIxSection::SetTargetMass(G4double value)
186 { 183 {
187 targetMass = value; 184 targetMass = value;
188 factD = std::sqrt(mom2)/value; 185 factD = std::sqrt(mom2)/value;
189 } 186 }
190 187
191 //....oooOO0OOooo........oooOO0OOooo........oo 188 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
192 189
193 inline G4double G4WentzelOKandVIxSection::GetM 190 inline G4double G4WentzelOKandVIxSection::GetMomentumSquare() const
194 { 191 {
195 return mom2; 192 return mom2;
196 } 193 }
197 194
198 //....oooOO0OOooo........oooOO0OOooo........oo 195 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
199 196
200 inline G4double G4WentzelOKandVIxSection::GetC 197 inline G4double G4WentzelOKandVIxSection::GetCosThetaNuc() const
201 { 198 {
202 return cosTetMaxNuc; 199 return cosTetMaxNuc;
203 } 200 }
204 201
205 //....oooOO0OOooo........oooOO0OOooo........oo 202 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
206 203
207 inline G4double G4WentzelOKandVIxSection::GetC 204 inline G4double G4WentzelOKandVIxSection::GetCosThetaElec() const
208 { 205 {
209 return cosTetMaxElec; 206 return cosTetMaxElec;
210 } 207 }
211 208
212 //....oooOO0OOooo........oooOO0OOooo........oo 209 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
213 210
214 inline G4double 211 inline G4double
215 G4WentzelOKandVIxSection::ComputeNuclearCrossS 212 G4WentzelOKandVIxSection::ComputeNuclearCrossSection(G4double cosTMin,
216 G4double cosTMax) 213 G4double cosTMax)
217 { 214 {
218 return targetZ*kinFactor*fMottFactor*(cosTMi 215 return targetZ*kinFactor*fMottFactor*(cosTMin - cosTMax)/
219 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax 216 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax + screenZ));
220 } 217 }
221 218
222 //....oooOO0OOooo........oooOO0OOooo........oo 219 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
223 220
224 inline G4double 221 inline G4double
225 G4WentzelOKandVIxSection::ComputeElectronCross 222 G4WentzelOKandVIxSection::ComputeElectronCrossSection(G4double cosTMin,
226 G4double cosTMax) 223 G4double cosTMax)
227 { 224 {
228 G4double cost1 = std::max(cosTMin,cosTetMaxE 225 G4double cost1 = std::max(cosTMin,cosTetMaxElec);
229 G4double cost2 = std::max(cosTMax,cosTetMaxE 226 G4double cost2 = std::max(cosTMax,cosTetMaxElec);
230 return (cost1 <= cost2) ? 0.0 : kinFactor*fM 227 return (cost1 <= cost2) ? 0.0 : kinFactor*fMottFactor*(cost1 - cost2)/
231 ((1.0 - cost1 + screenZ)*(1.0 - cost2 + sc 228 ((1.0 - cost1 + screenZ)*(1.0 - cost2 + screenZ));
232 } 229 }
233 230
234 inline G4double G4WentzelOKandVIxSection::Flat 231 inline G4double G4WentzelOKandVIxSection::FlatFormfactor(G4double x)
235 { 232 {
236 return 3.0*(std::sin(x) - x*std::cos(x))/(x* 233 return 3.0*(std::sin(x) - x*std::cos(x))/(x*x*x);
237 } 234 }
238 235
239 //....oooOO0OOooo........oooOO0OOooo........oo 236 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
240 237
241 #endif 238 #endif
242 239
243 240