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25 // 25 //
>> 26 // $Id: G4WentzelVIRelXSection.hh 94676 2015-12-02 09:51:20Z gunter $
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: G4WentzelVIRelXSection 34 // File name: G4WentzelVIRelXSection
34 // 35 //
35 // Authors: V.Ivanchenko 36 // Authors: V.Ivanchenko
36 // 37 //
37 // Creation date: 08.06.2012 from G4WentzelOKa 38 // Creation date: 08.06.2012 from G4WentzelOKandVIxSection
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 G4WentzelVIRelXSection_h 54 #ifndef G4WentzelVIRelXSection_h
54 #define G4WentzelVIRelXSection_h 1 55 #define G4WentzelVIRelXSection_h 1
55 56
56 //....oooOO0OOooo........oooOO0OOooo........oo 57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57 58
58 #include "G4WentzelOKandVIxSection.hh" <<
59 #include "globals.hh" 59 #include "globals.hh"
>> 60 #include "G4Material.hh"
>> 61 #include "G4Element.hh"
>> 62 #include "G4ElementVector.hh"
>> 63 #include "G4NistManager.hh"
>> 64 #include "G4ThreeVector.hh"
>> 65 #include "G4Pow.hh"
>> 66
>> 67 class G4ParticleDefinition;
60 68
61 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
62 70
63 class G4WentzelVIRelXSection : public G4Wentze << 71 class G4WentzelVIRelXSection
64 { 72 {
65 73
66 public: 74 public:
67 75
68 explicit G4WentzelVIRelXSection(); << 76 G4WentzelVIRelXSection(G4bool combined = true);
>> 77
>> 78 virtual ~G4WentzelVIRelXSection();
69 79
70 ~G4WentzelVIRelXSection() override; << 80 void Initialise(const G4ParticleDefinition*, G4double CosThetaLim);
>> 81
>> 82 void SetupParticle(const G4ParticleDefinition*);
71 83
72 // return cos(ThetaMax) for msc and cos(thet 84 // return cos(ThetaMax) for msc and cos(thetaMin) for single scattering
73 // cut = DBL_MAX means no scattering off ele 85 // cut = DBL_MAX means no scattering off electrons
74 G4double SetupKinematic(G4double kinEnergy, << 86 G4double SetupTarget(G4int Z, G4double cut);
75 87
76 G4WentzelVIRelXSection & operator= << 88 G4double ComputeTransportCrossSectionPerAtom(G4double CosThetaMax);
77 (const G4WentzelVIRelXSection &right) = dele << 89
78 G4WentzelVIRelXSection(const G4WentzelVIRel << 90 G4ThreeVector& SampleSingleScattering(G4double CosThetaMin,
>> 91 G4double CosThetaMax,
>> 92 G4double elecRatio);
>> 93
>> 94 inline G4double ComputeNuclearCrossSection(G4double CosThetaMin,
>> 95 G4double CosThetaMax);
>> 96
>> 97 inline G4double ComputeElectronCrossSection(G4double CosThetaMin,
>> 98 G4double CosThetaMax);
>> 99
>> 100 inline G4double SetupKinematic(G4double kinEnergy,
>> 101 const G4Material* mat,
>> 102 G4double cut,
>> 103 G4double tmass);
>> 104
>> 105 inline G4double GetMomentumSquare() const;
>> 106
>> 107 inline G4double GetCosThetaNuc() const;
>> 108
>> 109 inline G4double GetCosThetaElec() const;
>> 110
>> 111 private:
>> 112
>> 113 void ComputeMaxElectronScattering(G4double cut);
>> 114
>> 115 // hide assignment operator
>> 116 G4WentzelVIRelXSection & operator=(const G4WentzelVIRelXSection &right);
>> 117 G4WentzelVIRelXSection(const G4WentzelVIRelXSection&);
>> 118
>> 119 const G4ParticleDefinition* theProton;
>> 120 const G4ParticleDefinition* theElectron;
>> 121 const G4ParticleDefinition* thePositron;
>> 122 const G4Material* currentMaterial;
>> 123
>> 124 G4NistManager* fNistManager;
>> 125 G4Pow* fG4pow;
>> 126
>> 127 G4ThreeVector temp;
>> 128
>> 129 G4double numlimit;
>> 130
>> 131 // integer parameters
>> 132 G4int nwarnings;
>> 133 G4int nwarnlimit;
>> 134
>> 135 G4bool isCombined;
>> 136
>> 137 // single scattering parameters
>> 138 G4double coeff;
>> 139 G4double cosTetMaxElec;
>> 140 G4double cosTetMaxNuc;
>> 141 G4double cosThetaMax;
>> 142 G4double alpha2;
>> 143
>> 144 // projectile
>> 145 const G4ParticleDefinition* particle;
>> 146
>> 147 G4double chargeSquare;
>> 148 G4double charge3;
>> 149 G4double spin;
>> 150 G4double mass;
>> 151 G4double tkin;
>> 152 G4double mom2;
>> 153 G4double momCM2;
>> 154 G4double invbeta2;
>> 155 G4double kinFactor;
>> 156 G4double etag;
>> 157 G4double ecut;
>> 158 G4double lowEnergyLimit;
>> 159
>> 160 // target
>> 161 G4int targetZ;
>> 162 G4double targetMass;
>> 163 G4double screenZ;
>> 164 G4double formfactA;
>> 165 G4double factorA2;
>> 166 G4double factB;
>> 167 G4double factB1;
>> 168 G4double factD;
>> 169 G4double gam0pcmp;
>> 170 G4double pcmp2;
79 171
>> 172 static G4double ScreenRSquare[100];
>> 173 static G4double FormFactor[100];
80 }; 174 };
81 175
>> 176 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 177
>> 178 inline G4double
>> 179 G4WentzelVIRelXSection::SetupKinematic(G4double kinEnergy,
>> 180 const G4Material* mat,
>> 181 G4double cut,
>> 182 G4double tmass)
>> 183 {
>> 184 if(kinEnergy != tkin || mat != currentMaterial ||
>> 185 ecut != cut || tmass != targetMass) {
>> 186
>> 187 currentMaterial = mat;
>> 188 ecut = cut;
>> 189 tkin = kinEnergy;
>> 190 G4double momLab2 = tkin*(tkin + 2.0*mass);
>> 191
>> 192 G4double etot = tkin + mass;
>> 193 G4double ptot = std::sqrt(momLab2);
>> 194 G4double m12 = mass*mass;
>> 195
>> 196 targetMass = tmass;
>> 197
>> 198 // relativistic reduced mass from publucation
>> 199 // A.P. Martynenko, R.N. Faustov, Teoret. mat. Fiz. 64 (1985) 179
>> 200
>> 201 //incident particle & target nucleus
>> 202 G4double Ecm = std::sqrt(m12 + targetMass*targetMass + 2.0*etot*targetMass);
>> 203 G4double mu_rel = mass*targetMass/Ecm;
>> 204 G4double momCM = ptot*targetMass/Ecm;
>> 205 // relative system
>> 206 mom2 = momCM*momCM;
>> 207 invbeta2 = 1.0 + mu_rel*mu_rel/mom2;
>> 208
>> 209 factB = spin/invbeta2;
>> 210 factD = std::sqrt(mom2)/tmass;
>> 211 if(isCombined) {
>> 212 G4double cost = 1.-factorA2*mat->GetIonisation()->GetInvA23()/mom2;
>> 213 if(cost > cosTetMaxNuc) { cosTetMaxNuc = cost; }
>> 214 }
>> 215 }
>> 216 return cosTetMaxNuc;
>> 217
>> 218 }
>> 219
>> 220 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 221
>> 222 inline G4double G4WentzelVIRelXSection::GetMomentumSquare() const
>> 223 {
>> 224 return mom2;
>> 225 }
>> 226
>> 227 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 228
>> 229 inline G4double G4WentzelVIRelXSection::GetCosThetaNuc() const
>> 230 {
>> 231 return cosTetMaxNuc;
>> 232 }
>> 233
>> 234 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 235
>> 236 inline G4double G4WentzelVIRelXSection::GetCosThetaElec() const
>> 237 {
>> 238 return cosTetMaxElec;
>> 239 }
>> 240
>> 241 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 242
>> 243 inline G4double
>> 244 G4WentzelVIRelXSection::ComputeNuclearCrossSection(G4double cosTMin,
>> 245 G4double cosTMax)
>> 246 {
>> 247 G4double xsec = 0.0;
>> 248 if(cosTMax < cosTMin) {
>> 249 xsec = targetZ*kinFactor*(cosTMin - cosTMax)/
>> 250 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax + screenZ));
>> 251 }
>> 252 return xsec;
>> 253 }
>> 254
>> 255 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 256
>> 257 inline G4double
>> 258 G4WentzelVIRelXSection::ComputeElectronCrossSection(G4double cosTMin,
>> 259 G4double cosTMax)
>> 260 {
>> 261 G4double xsec = 0.0;
>> 262 G4double cost1 = std::max(cosTMin,cosTetMaxElec);
>> 263 G4double cost2 = std::max(cosTMax,cosTetMaxElec);
>> 264 if(cost1 > cost2) {
>> 265 xsec = kinFactor*(cost1 - cost2)/
>> 266 ((1.0 - cost1 + screenZ)*(1.0 - cost2 + screenZ));
>> 267 }
>> 268 return xsec;
>> 269 }
82 //....oooOO0OOooo........oooOO0OOooo........oo 270 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
83 271
84 #endif 272 #endif
85 273
86 274