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25 // 25 //
>> 26 // $Id: G4WentzelOKandVIxSection.hh 98737 2016-08-09 12:51:38Z gcosmo $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // 30 //
30 // GEANT4 Class header file 31 // GEANT4 Class header file
31 // 32 //
32 // 33 //
33 // File name: G4WentzelOKandVIxSection 34 // File name: G4WentzelOKandVIxSection
34 // 35 //
35 // Authors: V.Ivanchenko and O.Kadri 36 // Authors: V.Ivanchenko and O.Kadri
36 // 37 //
37 // Creation date: 21.05.2010 38 // Creation date: 21.05.2010
38 // 39 //
39 // Modifications: 40 // Modifications:
40 // 41 //
41 // 42 //
42 // Class Description: 43 // Class Description:
43 // 44 //
44 // Implementation of the computation of total 45 // Implementation of the computation of total and transport cross sections,
45 // sample scattering angle for the single scat 46 // sample scattering angle for the single scattering case.
46 // to be used by single and multiple scatterin 47 // to be used by single and multiple scattering models. References:
47 // 1) G.Wentzel, Z. Phys. 40 (1927) 590. 48 // 1) G.Wentzel, Z. Phys. 40 (1927) 590.
48 // 2) J.M. Fernandez-Varea et al., NIM B73 (19 49 // 2) J.M. Fernandez-Varea et al., NIM B73 (1993) 447.
49 // 50 //
50 // ------------------------------------------- 51 // -------------------------------------------------------------------
51 // 52 //
52 53
53 #ifndef G4WentzelOKandVIxSection_h 54 #ifndef G4WentzelOKandVIxSection_h
54 #define G4WentzelOKandVIxSection_h 1 55 #define G4WentzelOKandVIxSection_h 1
55 56
56 //....oooOO0OOooo........oooOO0OOooo........oo 57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57 58
58 #include "globals.hh" 59 #include "globals.hh"
59 #include "G4Material.hh" 60 #include "G4Material.hh"
60 #include "G4Element.hh" 61 #include "G4Element.hh"
61 #include "G4ElementVector.hh" 62 #include "G4ElementVector.hh"
62 #include "G4NistManager.hh" 63 #include "G4NistManager.hh"
63 #include "G4NuclearFormfactorType.hh" 64 #include "G4NuclearFormfactorType.hh"
64 #include "G4ThreeVector.hh" 65 #include "G4ThreeVector.hh"
65 #include "G4Pow.hh" 66 #include "G4Pow.hh"
66 67
67 class G4ParticleDefinition; 68 class G4ParticleDefinition;
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 combined = 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 G4double SetupTarget(G4int Z, G4double cut = DBL_MAX);
88 G4double SetupTarget(G4int Z, G4double cut); <<
89 88
90 G4double ComputeTransportCrossSectionPerAtom 89 G4double ComputeTransportCrossSectionPerAtom(G4double CosThetaMax);
91 90
92 G4ThreeVector& SampleSingleScattering(G4doub 91 G4ThreeVector& SampleSingleScattering(G4double CosThetaMin,
93 G4double CosThetaMax, 92 G4double CosThetaMax,
94 G4double elecRatio); << 93 G4double elecRatio = 0.0);
95 94
96 G4double ComputeSecondTransportMoment(G4doub 95 G4double ComputeSecondTransportMoment(G4double CosThetaMax);
97 96
98 inline G4double ComputeNuclearCrossSection(G 97 inline G4double ComputeNuclearCrossSection(G4double CosThetaMin,
99 G4double CosThetaMax); 98 G4double CosThetaMax);
100 99
101 inline G4double ComputeElectronCrossSection( 100 inline G4double ComputeElectronCrossSection(G4double CosThetaMin,
102 G4double CosThetaMax); 101 G4double CosThetaMax);
103 << 102
>> 103 inline G4double SetupKinematic(G4double kinEnergy, const G4Material* mat);
>> 104
104 inline void SetTargetMass(G4double value); 105 inline void SetTargetMass(G4double value);
105 106
106 inline G4double GetMomentumSquare() const; 107 inline G4double GetMomentumSquare() const;
107 108
108 inline G4double GetCosThetaNuc() const; 109 inline G4double GetCosThetaNuc() const;
109 110
110 inline G4double GetCosThetaElec() const; 111 inline G4double GetCosThetaElec() const;
111 112
112 // hide assignment operator << 113 private:
113 G4WentzelOKandVIxSection & operator= <<
114 (const G4WentzelOKandVIxSection &right) = de <<
115 G4WentzelOKandVIxSection(const G4WentzelOKa <<
116 <<
117 protected: <<
118 114
119 void ComputeMaxElectronScattering(G4double c 115 void ComputeMaxElectronScattering(G4double cut);
120 116
121 void InitialiseA(); <<
122 <<
123 inline G4double FlatFormfactor(G4double x); 117 inline G4double FlatFormfactor(G4double x);
124 118
>> 119 // hide assignment operator
>> 120 G4WentzelOKandVIxSection & operator=
>> 121 (const G4WentzelOKandVIxSection &right) = delete;
>> 122 G4WentzelOKandVIxSection(const G4WentzelOKandVIxSection&) = delete;
>> 123
125 const G4ParticleDefinition* theProton; 124 const G4ParticleDefinition* theProton;
126 const G4ParticleDefinition* theElectron; 125 const G4ParticleDefinition* theElectron;
127 const G4ParticleDefinition* thePositron; 126 const G4ParticleDefinition* thePositron;
128 const G4ParticleDefinition* particle = nullp << 127 const G4Material* currentMaterial;
129 const G4Material* currentMaterial = nullptr; << 128
>> 129 G4NistManager* fNistManager;
>> 130 G4Pow* fG4pow;
130 131
131 G4NistManager* fNistManager; << 132 G4ThreeVector temp;
132 G4Pow* fG4pow; <<
133 133
134 G4ScreeningMottCrossSection* fMottXSection = << 134 G4double numlimit;
135 135
136 G4ThreeVector temp; << 136 // integer parameters
>> 137 G4int nwarnings;
>> 138 G4int nwarnlimit;
>> 139
>> 140 G4NuclearFormfactorType fNucFormfactor;
>> 141
>> 142 G4bool isCombined;
137 143
138 // single scattering parameters 144 // single scattering parameters
139 G4double coeff; 145 G4double coeff;
140 G4double cosTetMaxElec = 1.0; << 146 G4double cosTetMaxElec;
141 G4double cosTetMaxNuc = 1.0; << 147 G4double cosTetMaxNuc;
142 << 148 G4double cosThetaMax;
143 // for the combined mode it is cos(thetaMax) << 149 G4double alpha2;
144 // for single scattering it is cos(thetaMin) << 150
145 G4double cosThetaMax = 1.0; << 151 // projectile
146 << 152 const G4ParticleDefinition* particle;
147 G4double chargeSquare = 0.0; << 153
148 G4double charge3 = 0.0; << 154 G4double chargeSquare;
149 G4double spin = 0.0; << 155 G4double charge3;
150 G4double mass = 0.0; << 156 G4double spin;
151 G4double tkin = 0.0; << 157 G4double mass;
152 G4double mom2 = 0.0; << 158 G4double tkin;
153 G4double momCM2 = 0.0; << 159 G4double mom2;
154 G4double invbeta2 = 1.0; << 160 G4double momCM2;
155 G4double kinFactor = 1.0; << 161 G4double invbeta2;
156 G4double etag = DBL_MAX; << 162 G4double kinFactor;
157 G4double ecut = DBL_MAX; << 163 G4double etag;
>> 164 G4double ecut;
>> 165 G4double lowEnergyLimit;
158 166
159 // target 167 // target
>> 168 G4int targetZ;
160 G4double targetMass; 169 G4double targetMass;
161 G4double screenZ = 0.0; << 170 G4double screenZ;
162 G4double formfactA = 0.0; << 171 G4double formfactA;
163 G4double factorA2 = 0.0; << 172 G4double factorA2;
164 G4double factB = 0.0; << 173 G4double factB;
165 G4double factD = 0.0; << 174 G4double factB1;
166 G4double fMottFactor = 1.0; << 175 G4double factD;
167 G4double gam0pcmp = 1.0; << 176 G4double gam0pcmp;
168 G4double pcmp2 = 1.0; << 177 G4double pcmp2;
169 <<
170 // integer parameters <<
171 G4int targetZ = 0; <<
172 G4int nwarnings = 0; <<
173 <<
174 G4NuclearFormfactorType fNucFormfactor = fEx <<
175 <<
176 G4bool isCombined; <<
177 178
178 static G4double ScreenRSquareElec[100]; 179 static G4double ScreenRSquareElec[100];
179 static G4double ScreenRSquare[100]; 180 static G4double ScreenRSquare[100];
180 static G4double FormFactor[100]; 181 static G4double FormFactor[100];
181 }; 182 };
182 183
>> 184 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 185
>> 186 inline G4double
>> 187 G4WentzelOKandVIxSection::SetupKinematic(G4double ekin, const G4Material* mat)
>> 188 {
>> 189 if(ekin != tkin || mat != currentMaterial) {
>> 190 currentMaterial = mat;
>> 191 tkin = ekin;
>> 192 mom2 = tkin*(tkin + 2.0*mass);
>> 193 invbeta2 = 1.0 + mass*mass/mom2;
>> 194 factB = spin/invbeta2;
>> 195 cosTetMaxNuc = cosThetaMax;
>> 196 if(isCombined) {
>> 197 cosTetMaxNuc = std::max(cosTetMaxNuc,
>> 198 1.-factorA2*mat->GetIonisation()->GetInvA23()/mom2);
>> 199 }
>> 200 }
>> 201 return cosTetMaxNuc;
>> 202 }
>> 203
183 //....oooOO0OOooo........oooOO0OOooo........oo 204 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
184 205
185 inline void G4WentzelOKandVIxSection::SetTarge 206 inline void G4WentzelOKandVIxSection::SetTargetMass(G4double value)
186 { 207 {
187 targetMass = value; 208 targetMass = value;
188 factD = std::sqrt(mom2)/value; 209 factD = std::sqrt(mom2)/value;
189 } 210 }
190 211
191 //....oooOO0OOooo........oooOO0OOooo........oo 212 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
192 213
193 inline G4double G4WentzelOKandVIxSection::GetM 214 inline G4double G4WentzelOKandVIxSection::GetMomentumSquare() const
194 { 215 {
195 return mom2; 216 return mom2;
196 } 217 }
197 218
198 //....oooOO0OOooo........oooOO0OOooo........oo 219 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
199 220
200 inline G4double G4WentzelOKandVIxSection::GetC 221 inline G4double G4WentzelOKandVIxSection::GetCosThetaNuc() const
201 { 222 {
202 return cosTetMaxNuc; 223 return cosTetMaxNuc;
203 } 224 }
204 225
205 //....oooOO0OOooo........oooOO0OOooo........oo 226 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
206 227
207 inline G4double G4WentzelOKandVIxSection::GetC 228 inline G4double G4WentzelOKandVIxSection::GetCosThetaElec() const
208 { 229 {
209 return cosTetMaxElec; 230 return cosTetMaxElec;
210 } 231 }
211 232
212 //....oooOO0OOooo........oooOO0OOooo........oo 233 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
213 234
214 inline G4double 235 inline G4double
215 G4WentzelOKandVIxSection::ComputeNuclearCrossS 236 G4WentzelOKandVIxSection::ComputeNuclearCrossSection(G4double cosTMin,
216 G4double cosTMax) 237 G4double cosTMax)
217 { 238 {
218 return targetZ*kinFactor*fMottFactor*(cosTMi << 239 G4double xsec = 0.0;
219 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax << 240 if(cosTMax < cosTMin) {
>> 241 xsec = targetZ*kinFactor*(cosTMin - cosTMax)/
>> 242 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax + screenZ));
>> 243 }
>> 244 return xsec;
220 } 245 }
221 246
222 //....oooOO0OOooo........oooOO0OOooo........oo 247 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
223 248
224 inline G4double 249 inline G4double
225 G4WentzelOKandVIxSection::ComputeElectronCross 250 G4WentzelOKandVIxSection::ComputeElectronCrossSection(G4double cosTMin,
226 G4double cosTMax) 251 G4double cosTMax)
227 { 252 {
>> 253 G4double xsec = 0.0;
228 G4double cost1 = std::max(cosTMin,cosTetMaxE 254 G4double cost1 = std::max(cosTMin,cosTetMaxElec);
229 G4double cost2 = std::max(cosTMax,cosTetMaxE 255 G4double cost2 = std::max(cosTMax,cosTetMaxElec);
230 return (cost1 <= cost2) ? 0.0 : kinFactor*fM << 256 if(cost1 > cost2) {
231 ((1.0 - cost1 + screenZ)*(1.0 - cost2 + sc << 257 xsec = kinFactor*(cost1 - cost2)/
>> 258 ((1.0 - cost1 + screenZ)*(1.0 - cost2 + screenZ));
>> 259 }
>> 260 return xsec;
232 } 261 }
233 262
234 inline G4double G4WentzelOKandVIxSection::Flat 263 inline G4double G4WentzelOKandVIxSection::FlatFormfactor(G4double x)
235 { 264 {
236 return 3.0*(std::sin(x) - x*std::cos(x))/(x* << 265 return 3*(std::sin(x) - x*std::cos(x))/(x*x*x);
237 } 266 }
238 267
239 //....oooOO0OOooo........oooOO0OOooo........oo 268 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
240 269
241 #endif 270 #endif
242 271
243 272