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25 // 25 //
>> 26 // $Id$
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
>> 104 //obsolete method
>> 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 momCM2;
155 G4double kinFactor = 1.0; << 154 G4double invbeta2;
156 G4double etag = DBL_MAX; << 155 G4double kinFactor;
157 G4double ecut = DBL_MAX; << 156 G4double etag;
>> 157 G4double ecut;
>> 158 G4double lowEnergyLimit;
158 159
159 // target 160 // target
>> 161 G4int targetZ;
160 G4double targetMass; 162 G4double targetMass;
161 G4double screenZ = 0.0; << 163 G4double screenZ;
162 G4double formfactA = 0.0; << 164 G4double formfactA;
163 G4double factorA2 = 0.0; << 165 G4double factorA2;
164 G4double factB = 0.0; << 166 G4double factB;
165 G4double factD = 0.0; << 167 G4double factB1;
166 G4double fMottFactor = 1.0; << 168 G4double factD;
167 G4double gam0pcmp = 1.0; << 169 G4double gam0pcmp;
168 G4double pcmp2 = 1.0; << 170 G4double pcmp2;
169 <<
170 // integer parameters <<
171 G4int targetZ = 0; <<
172 G4int nwarnings = 0; <<
173 171
174 G4NuclearFormfactorType fNucFormfactor = fEx <<
175 <<
176 G4bool isCombined; <<
177 <<
178 static G4double ScreenRSquareElec[100]; <<
179 static G4double ScreenRSquare[100]; 172 static G4double ScreenRSquare[100];
180 static G4double FormFactor[100]; 173 static G4double FormFactor[100];
181 }; 174 };
182 175
>> 176 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 177
>> 178 inline G4double
>> 179 G4WentzelOKandVIxSection::SetupKinematic(G4double ekin, const G4Material* mat)
>> 180 {
>> 181 if(ekin != tkin || mat != currentMaterial) {
>> 182 currentMaterial = mat;
>> 183 tkin = ekin;
>> 184 mom2 = tkin*(tkin + 2.0*mass);
>> 185 invbeta2 = 1.0 + mass*mass/mom2;
>> 186 factB = spin/invbeta2;
>> 187 cosTetMaxNuc =
>> 188 std::max(cosThetaMax,1.-factorA2*mat->GetIonisation()->GetInvA23()/mom2);
>> 189 }
>> 190 return cosTetMaxNuc;
>> 191 }
>> 192
183 //....oooOO0OOooo........oooOO0OOooo........oo 193 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
184 194
185 inline void G4WentzelOKandVIxSection::SetTarge 195 inline void G4WentzelOKandVIxSection::SetTargetMass(G4double value)
186 { 196 {
187 targetMass = value; 197 targetMass = value;
188 factD = std::sqrt(mom2)/value; 198 factD = std::sqrt(mom2)/value;
189 } 199 }
190 200
191 //....oooOO0OOooo........oooOO0OOooo........oo 201 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
192 202
>> 203 inline void G4WentzelOKandVIxSection::SetRelativisticMass(G4double value)
>> 204 {
>> 205 mass = value;
>> 206 }
>> 207
>> 208 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 209
193 inline G4double G4WentzelOKandVIxSection::GetM 210 inline G4double G4WentzelOKandVIxSection::GetMomentumSquare() const
194 { 211 {
195 return mom2; 212 return mom2;
196 } 213 }
197 214
198 //....oooOO0OOooo........oooOO0OOooo........oo 215 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
199 216
200 inline G4double G4WentzelOKandVIxSection::GetC 217 inline G4double G4WentzelOKandVIxSection::GetCosThetaNuc() const
201 { 218 {
202 return cosTetMaxNuc; 219 return cosTetMaxNuc;
203 } 220 }
204 221
205 //....oooOO0OOooo........oooOO0OOooo........oo 222 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
206 223
207 inline G4double G4WentzelOKandVIxSection::GetC 224 inline G4double G4WentzelOKandVIxSection::GetCosThetaElec() const
208 { 225 {
209 return cosTetMaxElec; 226 return cosTetMaxElec;
210 } 227 }
211 228
212 //....oooOO0OOooo........oooOO0OOooo........oo 229 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
213 230
214 inline G4double 231 inline G4double
215 G4WentzelOKandVIxSection::ComputeNuclearCrossS 232 G4WentzelOKandVIxSection::ComputeNuclearCrossSection(G4double cosTMin,
216 G4double cosTMax) 233 G4double cosTMax)
217 { 234 {
218 return targetZ*kinFactor*fMottFactor*(cosTMi << 235 G4double xsec = 0.0;
219 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax << 236 if(cosTMax < cosTMin) {
>> 237 xsec = targetZ*kinFactor*(cosTMin - cosTMax)/
>> 238 ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax + screenZ));
>> 239 }
>> 240 return xsec;
220 } 241 }
221 242
222 //....oooOO0OOooo........oooOO0OOooo........oo 243 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
223 244
224 inline G4double 245 inline G4double
225 G4WentzelOKandVIxSection::ComputeElectronCross 246 G4WentzelOKandVIxSection::ComputeElectronCrossSection(G4double cosTMin,
226 G4double cosTMax) 247 G4double cosTMax)
227 { 248 {
>> 249 G4double xsec = 0.0;
228 G4double cost1 = std::max(cosTMin,cosTetMaxE 250 G4double cost1 = std::max(cosTMin,cosTetMaxElec);
229 G4double cost2 = std::max(cosTMax,cosTetMaxE 251 G4double cost2 = std::max(cosTMax,cosTetMaxElec);
230 return (cost1 <= cost2) ? 0.0 : kinFactor*fM << 252 if(cost1 > cost2) {
231 ((1.0 - cost1 + screenZ)*(1.0 - cost2 + sc << 253 xsec = kinFactor*(cost1 - cost2)/((1.0 - cost1 + screenZ)*(1.0 - cost2 + screenZ));
>> 254 }
>> 255 return xsec;
232 } 256 }
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 257 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
240 258
241 #endif 259 #endif
242 260
243 261