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Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. * 17 // * 17 // * * 18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************* 24 // ******************************************************************** 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 #include "G4Threading.hh" 66 67 67 class G4ParticleDefinition; 68 class G4ParticleDefinition; 68 class G4ScreeningMottCrossSection; 69 class G4ScreeningMottCrossSection; 69 70 70 //....oooOO0OOooo........oooOO0OOooo........oo 71 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 71 72 72 class G4WentzelOKandVIxSection 73 class G4WentzelOKandVIxSection 73 { 74 { 74 75 75 public: 76 public: 76 77 77 explicit G4WentzelOKandVIxSection(G4bool com << 78 explicit G4WentzelOKandVIxSection(G4bool comb=true); 78 79 79 virtual ~G4WentzelOKandVIxSection(); 80 virtual ~G4WentzelOKandVIxSection(); 80 81 81 void Initialise(const G4ParticleDefinition*, 82 void Initialise(const G4ParticleDefinition*, G4double CosThetaLim); 82 83 83 void SetupParticle(const G4ParticleDefinitio 84 void SetupParticle(const G4ParticleDefinition*); 84 85 85 // return cos(ThetaMax) for msc and cos(thet 86 // return cos(ThetaMax) for msc and cos(thetaMin) for single scattering 86 // cut = DBL_MAX means no scattering off ele 87 // cut = DBL_MAX means no scattering off electrons 87 virtual G4double SetupKinematic(G4double kin << 88 G4double SetupKinematic(G4double kinEnergy, const G4Material* mat); 88 G4double SetupTarget(G4int Z, G4double cut); 89 G4double SetupTarget(G4int Z, G4double cut); 89 90 90 G4double ComputeTransportCrossSectionPerAtom 91 G4double ComputeTransportCrossSectionPerAtom(G4double CosThetaMax); 91 92 92 G4ThreeVector& SampleSingleScattering(G4doub 93 G4ThreeVector& SampleSingleScattering(G4double CosThetaMin, 93 G4double CosThetaMax, 94 G4double CosThetaMax, 94 G4double elecRatio); 95 G4double elecRatio); 95 96 96 G4double ComputeSecondTransportMoment(G4doub 97 G4double ComputeSecondTransportMoment(G4double CosThetaMax); 97 98 98 inline G4double ComputeNuclearCrossSection(G 99 inline G4double ComputeNuclearCrossSection(G4double CosThetaMin, 99 G4double CosThetaMax); 100 G4double CosThetaMax); 100 101 101 inline G4double ComputeElectronCrossSection( 102 inline G4double ComputeElectronCrossSection(G4double CosThetaMin, 102 G4double CosThetaMax); 103 G4double CosThetaMax); 103 104 104 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 G4WentzelOKandVIxSection & operator= << 114 (const G4WentzelOKandVIxSection &right) = de << 115 G4WentzelOKandVIxSection(const G4WentzelOKa << 116 << 117 protected: 113 protected: 118 114 119 void ComputeMaxElectronScattering(G4double c 115 void ComputeMaxElectronScattering(G4double cut); 120 116 121 void InitialiseA(); 117 void InitialiseA(); 122 118 123 inline G4double FlatFormfactor(G4double x); 119 inline G4double FlatFormfactor(G4double x); 124 120 125 const G4ParticleDefinition* theProton; 121 const G4ParticleDefinition* theProton; 126 const G4ParticleDefinition* theElectron; 122 const G4ParticleDefinition* theElectron; 127 const G4ParticleDefinition* thePositron; 123 const G4ParticleDefinition* thePositron; 128 const G4ParticleDefinition* particle = nullp << 124 const G4Material* currentMaterial; 129 const G4Material* currentMaterial = nullptr; << 130 125 131 G4NistManager* fNistManager; << 126 G4NistManager* fNistManager; 132 G4Pow* fG4pow; << 127 G4Pow* fG4pow; 133 128 134 G4ScreeningMottCrossSection* fMottXSection = << 129 G4ScreeningMottCrossSection* fMottXSection; 135 130 136 G4ThreeVector temp; << 131 G4ThreeVector temp; 137 132 138 // single scattering parameters << 133 G4double numlimit; 139 G4double coeff; << 140 G4double cosTetMaxElec = 1.0; << 141 G4double cosTetMaxNuc = 1.0; << 142 134 143 // for the combined mode it is cos(thetaMax) << 135 // integer parameters 144 // for single scattering it is cos(thetaMin) << 136 G4int nwarnings; 145 G4double cosThetaMax = 1.0; << 137 G4int nwarnlimit; 146 << 147 G4double chargeSquare = 0.0; << 148 G4double charge3 = 0.0; << 149 G4double spin = 0.0; << 150 G4double mass = 0.0; << 151 G4double tkin = 0.0; << 152 G4double mom2 = 0.0; << 153 G4double momCM2 = 0.0; << 154 G4double invbeta2 = 1.0; << 155 G4double kinFactor = 1.0; << 156 G4double etag = DBL_MAX; << 157 G4double ecut = DBL_MAX; << 158 138 159 // target << 139 G4NuclearFormfactorType fNucFormfactor; 160 G4double targetMass; << 161 G4double screenZ = 0.0; << 162 G4double formfactA = 0.0; << 163 G4double factorA2 = 0.0; << 164 G4double factB = 0.0; << 165 G4double factD = 0.0; << 166 G4double fMottFactor = 1.0; << 167 G4double gam0pcmp = 1.0; << 168 G4double pcmp2 = 1.0; << 169 140 170 // integer parameters << 141 G4bool isCombined; 171 G4int targetZ = 0; << 172 G4int nwarnings = 0; << 173 142 174 G4NuclearFormfactorType fNucFormfactor = fEx << 143 // single scattering parameters >> 144 G4double coeff; >> 145 G4double cosTetMaxElec; >> 146 G4double cosTetMaxNuc; >> 147 G4double cosThetaMax; >> 148 G4double alpha2; >> 149 >> 150 // projectile >> 151 const G4ParticleDefinition* particle; >> 152 >> 153 G4double chargeSquare; >> 154 G4double charge3; >> 155 G4double spin; >> 156 G4double mass; >> 157 G4double tkin; >> 158 G4double mom2; >> 159 G4double momCM2; >> 160 G4double invbeta2; >> 161 G4double kinFactor; >> 162 G4double etag; >> 163 G4double ecut; >> 164 G4double lowEnergyLimit; 175 165 176 G4bool isCombined; << 166 // target >> 167 G4int targetZ; >> 168 G4double targetMass; >> 169 G4double screenZ; >> 170 G4double formfactA; >> 171 G4double factorA2; >> 172 G4double factB; >> 173 G4double factB1; >> 174 G4double factD; >> 175 G4double fMottFactor; >> 176 G4double gam0pcmp; >> 177 G4double pcmp2; 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]; >> 182 >> 183 #ifdef G4MULTITHREADED >> 184 static G4Mutex WentzelOKandVIxSectionMutex; >> 185 #endif >> 186 >> 187 private: >> 188 // hide assignment operator >> 189 G4WentzelOKandVIxSection & operator= >> 190 (const G4WentzelOKandVIxSection &right) = delete; >> 191 G4WentzelOKandVIxSection(const G4WentzelOKandVIxSection&) = delete; 181 }; 192 }; 182 193 183 //....oooOO0OOooo........oooOO0OOooo........oo 194 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 184 195 185 inline void G4WentzelOKandVIxSection::SetTarge 196 inline void G4WentzelOKandVIxSection::SetTargetMass(G4double value) 186 { 197 { 187 targetMass = value; 198 targetMass = value; 188 factD = std::sqrt(mom2)/value; 199 factD = std::sqrt(mom2)/value; 189 } 200 } 190 201 191 //....oooOO0OOooo........oooOO0OOooo........oo 202 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 192 203 193 inline G4double G4WentzelOKandVIxSection::GetM 204 inline G4double G4WentzelOKandVIxSection::GetMomentumSquare() const 194 { 205 { 195 return mom2; 206 return mom2; 196 } 207 } 197 208 198 //....oooOO0OOooo........oooOO0OOooo........oo 209 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 199 210 200 inline G4double G4WentzelOKandVIxSection::GetC 211 inline G4double G4WentzelOKandVIxSection::GetCosThetaNuc() const 201 { 212 { 202 return cosTetMaxNuc; 213 return cosTetMaxNuc; 203 } 214 } 204 215 205 //....oooOO0OOooo........oooOO0OOooo........oo 216 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 206 217 207 inline G4double G4WentzelOKandVIxSection::GetC 218 inline G4double G4WentzelOKandVIxSection::GetCosThetaElec() const 208 { 219 { 209 return cosTetMaxElec; 220 return cosTetMaxElec; 210 } 221 } 211 222 212 //....oooOO0OOooo........oooOO0OOooo........oo 223 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 213 224 214 inline G4double 225 inline G4double 215 G4WentzelOKandVIxSection::ComputeNuclearCrossS 226 G4WentzelOKandVIxSection::ComputeNuclearCrossSection(G4double cosTMin, 216 G4double cosTMax) 227 G4double cosTMax) 217 { 228 { 218 return targetZ*kinFactor*fMottFactor*(cosTMi 229 return targetZ*kinFactor*fMottFactor*(cosTMin - cosTMax)/ 219 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax 230 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax + screenZ)); 220 } 231 } 221 232 222 //....oooOO0OOooo........oooOO0OOooo........oo 233 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 223 234 224 inline G4double 235 inline G4double 225 G4WentzelOKandVIxSection::ComputeElectronCross 236 G4WentzelOKandVIxSection::ComputeElectronCrossSection(G4double cosTMin, 226 G4double cosTMax) 237 G4double cosTMax) 227 { 238 { 228 G4double cost1 = std::max(cosTMin,cosTetMaxE 239 G4double cost1 = std::max(cosTMin,cosTetMaxElec); 229 G4double cost2 = std::max(cosTMax,cosTetMaxE 240 G4double cost2 = std::max(cosTMax,cosTetMaxElec); 230 return (cost1 <= cost2) ? 0.0 : kinFactor*fM 241 return (cost1 <= cost2) ? 0.0 : kinFactor*fMottFactor*(cost1 - cost2)/ 231 ((1.0 - cost1 + screenZ)*(1.0 - cost2 + sc 242 ((1.0 - cost1 + screenZ)*(1.0 - cost2 + screenZ)); 232 } 243 } 233 244 234 inline G4double G4WentzelOKandVIxSection::Flat 245 inline G4double G4WentzelOKandVIxSection::FlatFormfactor(G4double x) 235 { 246 { 236 return 3.0*(std::sin(x) - x*std::cos(x))/(x* 247 return 3.0*(std::sin(x) - x*std::cos(x))/(x*x*x); 237 } 248 } 238 249 239 //....oooOO0OOooo........oooOO0OOooo........oo 250 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 240 251 241 #endif 252 #endif 242 253 243 254