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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 // $Id: G4WentzelOKandVIxSection.hh,v 1.6 2010-06-25 09:41:38 gunter Exp $ >> 27 // GEANT4 tag $Name: geant4-09-04-patch-02 $ 26 // 28 // 27 // ------------------------------------------- 29 // ------------------------------------------------------------------- 28 // 30 // 29 // 31 // 30 // GEANT4 Class header file 32 // GEANT4 Class header file 31 // 33 // 32 // 34 // 33 // File name: G4WentzelOKandVIxSection 35 // File name: G4WentzelOKandVIxSection 34 // 36 // 35 // Authors: V.Ivanchenko and O.Kadri 37 // Authors: V.Ivanchenko and O.Kadri 36 // 38 // 37 // Creation date: 21.05.2010 39 // Creation date: 21.05.2010 38 // 40 // 39 // Modifications: 41 // Modifications: 40 // 42 // 41 // 43 // 42 // Class Description: 44 // Class Description: 43 // 45 // 44 // Implementation of the computation of total 46 // Implementation of the computation of total and transport cross sections, 45 // sample scattering angle for the single scat 47 // sample scattering angle for the single scattering case. 46 // to be used by single and multiple scatterin 48 // to be used by single and multiple scattering models. References: 47 // 1) G.Wentzel, Z. Phys. 40 (1927) 590. 49 // 1) G.Wentzel, Z. Phys. 40 (1927) 590. 48 // 2) J.M. Fernandez-Varea et al., NIM B73 (19 50 // 2) J.M. Fernandez-Varea et al., NIM B73 (1993) 447. 49 // 51 // 50 // ------------------------------------------- 52 // ------------------------------------------------------------------- 51 // 53 // 52 54 53 #ifndef G4WentzelOKandVIxSection_h 55 #ifndef G4WentzelOKandVIxSection_h 54 #define G4WentzelOKandVIxSection_h 1 56 #define G4WentzelOKandVIxSection_h 1 55 57 56 //....oooOO0OOooo........oooOO0OOooo........oo 58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 57 59 58 #include "globals.hh" 60 #include "globals.hh" 59 #include "G4Material.hh" 61 #include "G4Material.hh" 60 #include "G4Element.hh" 62 #include "G4Element.hh" 61 #include "G4ElementVector.hh" 63 #include "G4ElementVector.hh" 62 #include "G4NistManager.hh" 64 #include "G4NistManager.hh" 63 #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 G4WentzelOKandVIxSection(); 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 << 96 G4double ComputeSecondTransportMoment(G4doub << 97 94 98 inline G4double ComputeNuclearCrossSection(G 95 inline G4double ComputeNuclearCrossSection(G4double CosThetaMin, 99 G4double CosThetaMax); 96 G4double CosThetaMax); 100 97 101 inline G4double ComputeElectronCrossSection( 98 inline G4double ComputeElectronCrossSection(G4double CosThetaMin, 102 G4double CosThetaMax); 99 G4double CosThetaMax); 103 << 100 >> 101 inline G4double SetupKinematic(G4double kinEnergy, const G4Material* mat); >> 102 104 inline void SetTargetMass(G4double value); 103 inline void SetTargetMass(G4double value); 105 104 >> 105 inline void SetRelativisticMass(G4double value); >> 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(); << 117 // hide assignment operator 122 << 118 G4WentzelOKandVIxSection & operator=(const G4WentzelOKandVIxSection &right); 123 inline G4double FlatFormfactor(G4double x); << 119 G4WentzelOKandVIxSection(const G4WentzelOKandVIxSection&); 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 G4double numlimit; 135 130 136 G4ThreeVector temp; << 131 G4double elecXSRatio; >> 132 >> 133 // integer parameters >> 134 G4int nwarnings; >> 135 G4int nwarnlimit; 137 136 138 // single scattering parameters 137 // single scattering parameters 139 G4double coeff; 138 G4double coeff; 140 G4double cosTetMaxElec = 1.0; << 139 G4double cosTetMaxElec; 141 G4double cosTetMaxNuc = 1.0; << 140 G4double cosTetMaxNuc; 142 << 141 G4double cosThetaMax; 143 // for the combined mode it is cos(thetaMax) << 142 G4double alpha2; 144 // for single scattering it is cos(thetaMin) << 143 145 G4double cosThetaMax = 1.0; << 144 // projectile 146 << 145 const G4ParticleDefinition* particle; 147 G4double chargeSquare = 0.0; << 146 148 G4double charge3 = 0.0; << 147 G4double chargeSquare; 149 G4double spin = 0.0; << 148 G4double charge3; 150 G4double mass = 0.0; << 149 G4double spin; 151 G4double tkin = 0.0; << 150 G4double mass; 152 G4double mom2 = 0.0; << 151 G4double tkin; 153 G4double momCM2 = 0.0; << 152 G4double mom2; 154 G4double invbeta2 = 1.0; << 153 G4double invbeta2; 155 G4double kinFactor = 1.0; << 154 G4double kinFactor; 156 G4double etag = DBL_MAX; << 155 G4double etag; 157 G4double ecut = DBL_MAX; << 156 G4double ecut; >> 157 G4double lowEnergyLimit; 158 158 159 // target 159 // target >> 160 G4int targetZ; 160 G4double targetMass; 161 G4double targetMass; 161 G4double screenZ = 0.0; << 162 G4double screenZ; 162 G4double formfactA = 0.0; << 163 G4double formfactA; 163 G4double factorA2 = 0.0; << 164 G4double factorA2; 164 G4double factB = 0.0; << 165 G4double factB; 165 G4double factD = 0.0; << 166 G4double factD; 166 G4double fMottFactor = 1.0; << 167 G4double gam0pcmp = 1.0; << 168 G4double pcmp2 = 1.0; << 169 << 170 // integer parameters << 171 G4int targetZ = 0; << 172 G4int nwarnings = 0; << 173 167 174 G4NuclearFormfactorType fNucFormfactor = fEx << 175 << 176 G4bool isCombined; << 177 << 178 static G4double ScreenRSquareElec[100]; << 179 static G4double ScreenRSquare[100]; 168 static G4double ScreenRSquare[100]; 180 static G4double FormFactor[100]; 169 static G4double FormFactor[100]; 181 }; 170 }; 182 171 >> 172 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... >> 173 >> 174 inline G4double >> 175 G4WentzelOKandVIxSection::SetupKinematic(G4double ekin, const G4Material* mat) >> 176 { >> 177 if(ekin != tkin || mat != currentMaterial) { >> 178 currentMaterial = mat; >> 179 tkin = ekin; >> 180 mom2 = tkin*(tkin + 2.0*mass); >> 181 invbeta2 = 1.0 + mass*mass/mom2; >> 182 factB = spin/invbeta2; >> 183 cosTetMaxNuc = cosThetaMax; >> 184 if(std::fabs(cosThetaMax) < 1.0) { >> 185 cosTetMaxNuc = >> 186 std::max(cosThetaMax,1.-factorA2*mat->GetIonisation()->GetInvA23()/mom2); >> 187 } >> 188 } >> 189 return cosTetMaxNuc; >> 190 } >> 191 183 //....oooOO0OOooo........oooOO0OOooo........oo 192 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 184 193 185 inline void G4WentzelOKandVIxSection::SetTarge 194 inline void G4WentzelOKandVIxSection::SetTargetMass(G4double value) 186 { 195 { 187 targetMass = value; 196 targetMass = value; 188 factD = std::sqrt(mom2)/value; 197 factD = std::sqrt(mom2)/value; 189 } 198 } 190 199 191 //....oooOO0OOooo........oooOO0OOooo........oo 200 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 192 201 >> 202 inline void G4WentzelOKandVIxSection::SetRelativisticMass(G4double value) >> 203 { >> 204 mass = value; >> 205 } >> 206 >> 207 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... >> 208 193 inline G4double G4WentzelOKandVIxSection::GetM 209 inline G4double G4WentzelOKandVIxSection::GetMomentumSquare() const 194 { 210 { 195 return mom2; 211 return mom2; 196 } 212 } 197 213 198 //....oooOO0OOooo........oooOO0OOooo........oo 214 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 199 215 200 inline G4double G4WentzelOKandVIxSection::GetC 216 inline G4double G4WentzelOKandVIxSection::GetCosThetaNuc() const 201 { 217 { 202 return cosTetMaxNuc; 218 return cosTetMaxNuc; 203 } 219 } 204 220 205 //....oooOO0OOooo........oooOO0OOooo........oo 221 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 206 222 207 inline G4double G4WentzelOKandVIxSection::GetC 223 inline G4double G4WentzelOKandVIxSection::GetCosThetaElec() const 208 { 224 { 209 return cosTetMaxElec; 225 return cosTetMaxElec; 210 } 226 } 211 227 212 //....oooOO0OOooo........oooOO0OOooo........oo 228 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 213 229 214 inline G4double 230 inline G4double 215 G4WentzelOKandVIxSection::ComputeNuclearCrossS 231 G4WentzelOKandVIxSection::ComputeNuclearCrossSection(G4double cosTMin, 216 G4double cosTMax) 232 G4double cosTMax) 217 { 233 { 218 return targetZ*kinFactor*fMottFactor*(cosTMi << 234 G4double xsec = 0.0; 219 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax << 235 if(cosTMax < cosTMin) { >> 236 xsec = targetZ*kinFactor*(cosTMin - cosTMax)/ >> 237 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax + screenZ)); >> 238 } >> 239 return xsec; 220 } 240 } 221 241 222 //....oooOO0OOooo........oooOO0OOooo........oo 242 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 223 243 224 inline G4double 244 inline G4double 225 G4WentzelOKandVIxSection::ComputeElectronCross 245 G4WentzelOKandVIxSection::ComputeElectronCrossSection(G4double cosTMin, 226 G4double cosTMax) 246 G4double cosTMax) 227 { 247 { >> 248 G4double xsec = 0.0; 228 G4double cost1 = std::max(cosTMin,cosTetMaxE 249 G4double cost1 = std::max(cosTMin,cosTetMaxElec); 229 G4double cost2 = std::max(cosTMax,cosTetMaxE 250 G4double cost2 = std::max(cosTMax,cosTetMaxElec); 230 return (cost1 <= cost2) ? 0.0 : kinFactor*fM << 251 if(cost1 > cost2) { 231 ((1.0 - cost1 + screenZ)*(1.0 - cost2 + sc << 252 xsec = kinFactor*(cost1 - cost2)/((1.0 - cost1 + screenZ)*(1.0 - cost2 + screenZ)); >> 253 } >> 254 return xsec; 232 } 255 } 233 << 234 inline G4double G4WentzelOKandVIxSection::Flat << 235 { << 236 return 3.0*(std::sin(x) - x*std::cos(x))/(x* << 237 } << 238 << 239 //....oooOO0OOooo........oooOO0OOooo........oo 256 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 240 257 241 #endif 258 #endif 242 259 243 260