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25 // 25 //
>> 26 // $Id: G4WentzelOKandVIxSection.hh,v 1.6 2010/06/25 09:41:38 gunter Exp $
>> 27 // GEANT4 tag $Name: geant4-09-04-beta-01 $
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