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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 69548 2013-05-08 10:03:12Z 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 "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; << 69 68 70 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 71 70 72 class G4WentzelOKandVIxSection 71 class G4WentzelOKandVIxSection 73 { 72 { 74 73 75 public: 74 public: 76 75 77 explicit G4WentzelOKandVIxSection(G4bool com << 76 G4WentzelOKandVIxSection(); 78 77 79 virtual ~G4WentzelOKandVIxSection(); 78 virtual ~G4WentzelOKandVIxSection(); 80 79 81 void Initialise(const G4ParticleDefinition*, 80 void Initialise(const G4ParticleDefinition*, G4double CosThetaLim); 82 81 83 void SetupParticle(const G4ParticleDefinitio 82 void SetupParticle(const G4ParticleDefinition*); 84 83 85 // return cos(ThetaMax) for msc and cos(thet 84 // return cos(ThetaMax) for msc and cos(thetaMin) for single scattering 86 // cut = DBL_MAX means no scattering off ele 85 // cut = DBL_MAX means no scattering off electrons 87 virtual G4double SetupKinematic(G4double kin << 86 G4double SetupTarget(G4int Z, G4double cut = DBL_MAX); 88 G4double SetupTarget(G4int Z, G4double cut); << 89 87 90 G4double ComputeTransportCrossSectionPerAtom 88 G4double ComputeTransportCrossSectionPerAtom(G4double CosThetaMax); 91 89 92 G4ThreeVector& SampleSingleScattering(G4doub << 90 G4ThreeVector SampleSingleScattering(G4double CosThetaMin, 93 G4double CosThetaMax, << 91 G4double CosThetaMax, 94 G4double elecRatio); << 92 G4double elecRatio = 0.0); 95 << 96 G4double ComputeSecondTransportMoment(G4doub << 97 93 98 inline G4double ComputeNuclearCrossSection(G 94 inline G4double ComputeNuclearCrossSection(G4double CosThetaMin, 99 G4double CosThetaMax); 95 G4double CosThetaMax); 100 96 101 inline G4double ComputeElectronCrossSection( 97 inline G4double ComputeElectronCrossSection(G4double CosThetaMin, 102 G4double CosThetaMax); 98 G4double CosThetaMax); 103 << 99 >> 100 inline G4double SetupKinematic(G4double kinEnergy, const G4Material* mat); >> 101 104 inline void SetTargetMass(G4double value); 102 inline void SetTargetMass(G4double value); 105 103 106 inline G4double GetMomentumSquare() const; 104 inline G4double GetMomentumSquare() const; 107 105 108 inline G4double GetCosThetaNuc() const; 106 inline G4double GetCosThetaNuc() const; 109 107 110 inline G4double GetCosThetaElec() const; 108 inline G4double GetCosThetaElec() const; 111 109 112 // hide assignment operator << 110 private: 113 G4WentzelOKandVIxSection & operator= << 114 (const G4WentzelOKandVIxSection &right) = de << 115 G4WentzelOKandVIxSection(const G4WentzelOKa << 116 << 117 protected: << 118 111 119 void ComputeMaxElectronScattering(G4double c 112 void ComputeMaxElectronScattering(G4double cut); 120 113 121 void InitialiseA(); << 114 // hide assignment operator 122 << 115 G4WentzelOKandVIxSection & operator=(const G4WentzelOKandVIxSection &right); 123 inline G4double FlatFormfactor(G4double x); << 116 G4WentzelOKandVIxSection(const G4WentzelOKandVIxSection&); 124 117 125 const G4ParticleDefinition* theProton; 118 const G4ParticleDefinition* theProton; 126 const G4ParticleDefinition* theElectron; 119 const G4ParticleDefinition* theElectron; 127 const G4ParticleDefinition* thePositron; 120 const G4ParticleDefinition* thePositron; 128 const G4ParticleDefinition* particle = nullp << 121 const G4Material* currentMaterial; 129 const G4Material* currentMaterial = nullptr; << 130 122 131 G4NistManager* fNistManager; << 123 G4NistManager* fNistManager; 132 G4Pow* fG4pow; << 124 G4Pow* fG4pow; 133 125 134 G4ScreeningMottCrossSection* fMottXSection = << 126 G4double numlimit; 135 127 136 G4ThreeVector temp; << 128 G4double elecXSRatio; >> 129 >> 130 // integer parameters >> 131 G4int nwarnings; >> 132 G4int nwarnlimit; 137 133 138 // single scattering parameters 134 // single scattering parameters 139 G4double coeff; 135 G4double coeff; 140 G4double cosTetMaxElec = 1.0; << 136 G4double cosTetMaxElec; 141 G4double cosTetMaxNuc = 1.0; << 137 G4double cosTetMaxNuc; 142 << 138 G4double cosThetaMax; 143 // for the combined mode it is cos(thetaMax) << 139 G4double alpha2; 144 // for single scattering it is cos(thetaMin) << 140 145 G4double cosThetaMax = 1.0; << 141 // projectile 146 << 142 const G4ParticleDefinition* particle; 147 G4double chargeSquare = 0.0; << 143 148 G4double charge3 = 0.0; << 144 G4double chargeSquare; 149 G4double spin = 0.0; << 145 G4double charge3; 150 G4double mass = 0.0; << 146 G4double spin; 151 G4double tkin = 0.0; << 147 G4double mass; 152 G4double mom2 = 0.0; << 148 G4double tkin; 153 G4double momCM2 = 0.0; << 149 G4double mom2; 154 G4double invbeta2 = 1.0; << 150 G4double momCM2; 155 G4double kinFactor = 1.0; << 151 G4double invbeta2; 156 G4double etag = DBL_MAX; << 152 G4double kinFactor; 157 G4double ecut = DBL_MAX; << 153 G4double etag; >> 154 G4double ecut; >> 155 G4double lowEnergyLimit; 158 156 159 // target 157 // target >> 158 G4int targetZ; 160 G4double targetMass; 159 G4double targetMass; 161 G4double screenZ = 0.0; << 160 G4double screenZ; 162 G4double formfactA = 0.0; << 161 G4double formfactA; 163 G4double factorA2 = 0.0; << 162 G4double factorA2; 164 G4double factB = 0.0; << 163 G4double factB; 165 G4double factD = 0.0; << 164 G4double factB1; 166 G4double fMottFactor = 1.0; << 165 G4double factD; 167 G4double gam0pcmp = 1.0; << 166 G4double gam0pcmp; 168 G4double pcmp2 = 1.0; << 167 G4double pcmp2; 169 << 170 // integer parameters << 171 G4int targetZ = 0; << 172 G4int nwarnings = 0; << 173 << 174 G4NuclearFormfactorType fNucFormfactor = fEx << 175 << 176 G4bool isCombined; << 177 168 178 static G4double ScreenRSquareElec[100]; 169 static G4double ScreenRSquareElec[100]; 179 static G4double ScreenRSquare[100]; 170 static G4double ScreenRSquare[100]; 180 static G4double FormFactor[100]; 171 static G4double FormFactor[100]; 181 }; 172 }; 182 173 >> 174 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... >> 175 >> 176 inline G4double >> 177 G4WentzelOKandVIxSection::SetupKinematic(G4double ekin, const G4Material* mat) >> 178 { >> 179 if(ekin != tkin || mat != currentMaterial) { >> 180 currentMaterial = mat; >> 181 tkin = ekin; >> 182 mom2 = tkin*(tkin + 2.0*mass); >> 183 invbeta2 = 1.0 + mass*mass/mom2; >> 184 factB = spin/invbeta2; >> 185 cosTetMaxNuc = >> 186 std::max(cosThetaMax,1.-factorA2*mat->GetIonisation()->GetInvA23()/mom2); >> 187 } >> 188 return cosTetMaxNuc; >> 189 } >> 190 183 //....oooOO0OOooo........oooOO0OOooo........oo 191 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 184 192 185 inline void G4WentzelOKandVIxSection::SetTarge 193 inline void G4WentzelOKandVIxSection::SetTargetMass(G4double value) 186 { 194 { 187 targetMass = value; 195 targetMass = value; 188 factD = std::sqrt(mom2)/value; 196 factD = std::sqrt(mom2)/value; 189 } 197 } 190 198 191 //....oooOO0OOooo........oooOO0OOooo........oo 199 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 192 200 193 inline G4double G4WentzelOKandVIxSection::GetM 201 inline G4double G4WentzelOKandVIxSection::GetMomentumSquare() const 194 { 202 { 195 return mom2; 203 return mom2; 196 } 204 } 197 205 198 //....oooOO0OOooo........oooOO0OOooo........oo 206 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 199 207 200 inline G4double G4WentzelOKandVIxSection::GetC 208 inline G4double G4WentzelOKandVIxSection::GetCosThetaNuc() const 201 { 209 { 202 return cosTetMaxNuc; 210 return cosTetMaxNuc; 203 } 211 } 204 212 205 //....oooOO0OOooo........oooOO0OOooo........oo 213 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 206 214 207 inline G4double G4WentzelOKandVIxSection::GetC 215 inline G4double G4WentzelOKandVIxSection::GetCosThetaElec() const 208 { 216 { 209 return cosTetMaxElec; 217 return cosTetMaxElec; 210 } 218 } 211 219 212 //....oooOO0OOooo........oooOO0OOooo........oo 220 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 213 221 214 inline G4double 222 inline G4double 215 G4WentzelOKandVIxSection::ComputeNuclearCrossS 223 G4WentzelOKandVIxSection::ComputeNuclearCrossSection(G4double cosTMin, 216 G4double cosTMax) 224 G4double cosTMax) 217 { 225 { 218 return targetZ*kinFactor*fMottFactor*(cosTMi << 226 G4double xsec = 0.0; 219 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax << 227 if(cosTMax < cosTMin) { >> 228 xsec = targetZ*kinFactor*(cosTMin - cosTMax)/ >> 229 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax + screenZ)); >> 230 } >> 231 return xsec; 220 } 232 } 221 233 222 //....oooOO0OOooo........oooOO0OOooo........oo 234 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 223 235 224 inline G4double 236 inline G4double 225 G4WentzelOKandVIxSection::ComputeElectronCross 237 G4WentzelOKandVIxSection::ComputeElectronCrossSection(G4double cosTMin, 226 G4double cosTMax) 238 G4double cosTMax) 227 { 239 { >> 240 G4double xsec = 0.0; 228 G4double cost1 = std::max(cosTMin,cosTetMaxE 241 G4double cost1 = std::max(cosTMin,cosTetMaxElec); 229 G4double cost2 = std::max(cosTMax,cosTetMaxE 242 G4double cost2 = std::max(cosTMax,cosTetMaxElec); 230 return (cost1 <= cost2) ? 0.0 : kinFactor*fM << 243 if(cost1 > cost2) { 231 ((1.0 - cost1 + screenZ)*(1.0 - cost2 + sc << 244 xsec = kinFactor*(cost1 - cost2)/((1.0 - cost1 + screenZ)*(1.0 - cost2 + screenZ)); >> 245 } >> 246 return xsec; 232 } 247 } 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 248 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 240 249 241 #endif 250 #endif 242 251 243 252