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27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class file 29 // GEANT4 Class file
30 // 30 //
31 // 31 //
32 // File name: G4WentzelOKandVIxSection 32 // File name: G4WentzelOKandVIxSection
33 // 33 //
34 // Author: V.Ivanchenko 34 // Author: V.Ivanchenko
35 // 35 //
36 // Creation date: 09.04.2008 from G4MuMscModel 36 // Creation date: 09.04.2008 from G4MuMscModel
37 // 37 //
38 // Modifications: 38 // Modifications:
39 // 39 //
40 // ------------------------------------------- 40 // -------------------------------------------------------------------
41 // 41 //
42 42
43 //....oooOO0OOooo........oooOO0OOooo........oo 43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
44 //....oooOO0OOooo........oooOO0OOooo........oo 44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
45 45
46 #include "G4WentzelOKandVIxSection.hh" 46 #include "G4WentzelOKandVIxSection.hh"
47 #include "G4ScreeningMottCrossSection.hh" 47 #include "G4ScreeningMottCrossSection.hh"
48 #include "G4PhysicalConstants.hh" 48 #include "G4PhysicalConstants.hh"
49 #include "G4SystemOfUnits.hh" 49 #include "G4SystemOfUnits.hh"
50 #include "Randomize.hh" 50 #include "Randomize.hh"
51 #include "G4Electron.hh" 51 #include "G4Electron.hh"
52 #include "G4Positron.hh" 52 #include "G4Positron.hh"
53 #include "G4Proton.hh" 53 #include "G4Proton.hh"
54 #include "G4EmParameters.hh" 54 #include "G4EmParameters.hh"
55 #include "G4Log.hh" 55 #include "G4Log.hh"
56 #include "G4Exp.hh" 56 #include "G4Exp.hh"
57 #include "G4AutoLock.hh" 57 #include "G4AutoLock.hh"
58 58
59 //....oooOO0OOooo........oooOO0OOooo........oo 59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
60 60
61 G4double G4WentzelOKandVIxSection::ScreenRSqua 61 G4double G4WentzelOKandVIxSection::ScreenRSquareElec[] = {0.0};
62 G4double G4WentzelOKandVIxSection::ScreenRSqua 62 G4double G4WentzelOKandVIxSection::ScreenRSquare[] = {0.0};
63 G4double G4WentzelOKandVIxSection::FormFactor[ 63 G4double G4WentzelOKandVIxSection::FormFactor[] = {0.0};
64 64
65 namespace 65 namespace
66 { 66 {
67 G4Mutex theWOKVIMutex = G4MUTEX_INITIALIZER; 67 G4Mutex theWOKVIMutex = G4MUTEX_INITIALIZER;
68 } 68 }
69 69
70 const G4double alpha2 = CLHEP::fine_structure_ 70 const G4double alpha2 = CLHEP::fine_structure_const*CLHEP::fine_structure_const;
71 const G4double factB1= 0.5*CLHEP::pi*CLHEP::fi 71 const G4double factB1= 0.5*CLHEP::pi*CLHEP::fine_structure_const;
72 const G4double numlimit = 0.1; 72 const G4double numlimit = 0.1;
73 const G4int nwarnlimit = 50; 73 const G4int nwarnlimit = 50;
74 74
75 using namespace std; 75 using namespace std;
76 76
77 G4WentzelOKandVIxSection::G4WentzelOKandVIxSec 77 G4WentzelOKandVIxSection::G4WentzelOKandVIxSection(G4bool comb) :
78 temp(0.,0.,0.), 78 temp(0.,0.,0.),
79 isCombined(comb) 79 isCombined(comb)
80 { 80 {
81 fNistManager = G4NistManager::Instance(); 81 fNistManager = G4NistManager::Instance();
82 fG4pow = G4Pow::GetInstance(); 82 fG4pow = G4Pow::GetInstance();
83 83
84 theElectron = G4Electron::Electron(); 84 theElectron = G4Electron::Electron();
85 thePositron = G4Positron::Positron(); 85 thePositron = G4Positron::Positron();
86 theProton = G4Proton::Proton(); 86 theProton = G4Proton::Proton();
87 87
88 G4double p0 = CLHEP::electron_mass_c2*CLHEP: 88 G4double p0 = CLHEP::electron_mass_c2*CLHEP::classic_electr_radius;
89 coeff = CLHEP::twopi*p0*p0; 89 coeff = CLHEP::twopi*p0*p0;
90 targetMass = CLHEP::proton_mass_c2; 90 targetMass = CLHEP::proton_mass_c2;
91 } 91 }
92 92
93 //....oooOO0OOooo........oooOO0OOooo........oo 93 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
94 94
95 G4WentzelOKandVIxSection::~G4WentzelOKandVIxSe 95 G4WentzelOKandVIxSection::~G4WentzelOKandVIxSection()
96 { 96 {
97 delete fMottXSection; 97 delete fMottXSection;
98 } 98 }
99 99
100 //....oooOO0OOooo........oooOO0OOooo........oo 100 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
101 101
102 void G4WentzelOKandVIxSection::Initialise(cons 102 void G4WentzelOKandVIxSection::Initialise(const G4ParticleDefinition* p,
103 G4do 103 G4double cosThetaLim)
104 { 104 {
105 SetupParticle(p); 105 SetupParticle(p);
106 tkin = mom2 = momCM2 = 0.0; 106 tkin = mom2 = momCM2 = 0.0;
107 ecut = etag = DBL_MAX; 107 ecut = etag = DBL_MAX;
108 targetZ = 0; 108 targetZ = 0;
109 109
110 // cosThetaMax is below 1.0 only when MSC is 110 // cosThetaMax is below 1.0 only when MSC is combined with SS
111 if(isCombined) { cosThetaMax = cosThetaLim; 111 if(isCombined) { cosThetaMax = cosThetaLim; }
112 G4EmParameters* param = G4EmParameters::Inst 112 G4EmParameters* param = G4EmParameters::Instance();
113 G4double a = param->FactorForAngleLimit()*CL 113 G4double a = param->FactorForAngleLimit()*CLHEP::hbarc/CLHEP::fermi;
114 factorA2 = 0.5*a*a; 114 factorA2 = 0.5*a*a;
115 currentMaterial = nullptr; 115 currentMaterial = nullptr;
116 116
117 fNucFormfactor = param->NuclearFormfactorTyp 117 fNucFormfactor = param->NuclearFormfactorType();
118 if(0.0 == ScreenRSquare[0]) { InitialiseA(); 118 if(0.0 == ScreenRSquare[0]) { InitialiseA(); }
119 119
120 // Mott corrections always added 120 // Mott corrections always added
121 if((p == theElectron || p == thePositron) && 121 if((p == theElectron || p == thePositron) && !fMottXSection) {
122 fMottXSection = new G4ScreeningMottCrossSe 122 fMottXSection = new G4ScreeningMottCrossSection();
123 fMottXSection->Initialise(p, 1.0); 123 fMottXSection->Initialise(p, 1.0);
124 } 124 }
125 /* 125 /*
126 G4cout << "G4WentzelOKandVIxSection::Initial 126 G4cout << "G4WentzelOKandVIxSection::Initialise for "
127 << p->GetParticleName() << " cosThetaMax= " 127 << p->GetParticleName() << " cosThetaMax= " << cosThetaMax
128 << " " << ScreenRSquare[0] << " coeff= " < 128 << " " << ScreenRSquare[0] << " coeff= " << coeff << G4endl;
129 */ 129 */
130 } 130 }
131 131
132 //....oooOO0OOooo........oooOO0OOooo........oo 132 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
133 133
134 void G4WentzelOKandVIxSection::InitialiseA() 134 void G4WentzelOKandVIxSection::InitialiseA()
135 { 135 {
136 // Thomas-Fermi screening radii 136 // Thomas-Fermi screening radii
137 // Formfactors from A.V. Butkevich et al., N 137 // Formfactors from A.V. Butkevich et al., NIM A 488 (2002) 282
138 if(0.0 != ScreenRSquare[0]) { return; } 138 if(0.0 != ScreenRSquare[0]) { return; }
139 G4AutoLock l(&theWOKVIMutex); 139 G4AutoLock l(&theWOKVIMutex);
140 if(0.0 == ScreenRSquare[0]) { 140 if(0.0 == ScreenRSquare[0]) {
141 const G4double invmev2 = 1./(CLHEP::MeV*CL 141 const G4double invmev2 = 1./(CLHEP::MeV*CLHEP::MeV);
142 G4double a0 = CLHEP::electron_mass_c2/0.88 142 G4double a0 = CLHEP::electron_mass_c2/0.88534;
143 G4double constn = 6.937e-6*invmev2; 143 G4double constn = 6.937e-6*invmev2;
144 G4double fct = G4EmParameters::Instance()- 144 G4double fct = G4EmParameters::Instance()->ScreeningFactor();
145 145
146 G4double afact = 0.5*fct*alpha2*a0*a0; 146 G4double afact = 0.5*fct*alpha2*a0*a0;
147 ScreenRSquare[0] = afact; 147 ScreenRSquare[0] = afact;
148 ScreenRSquare[1] = afact; 148 ScreenRSquare[1] = afact;
149 ScreenRSquareElec[1] = afact; 149 ScreenRSquareElec[1] = afact;
150 FormFactor[1] = 3.097e-6*invmev2; 150 FormFactor[1] = 3.097e-6*invmev2;
151 151
152 for(G4int j=2; j<100; ++j) { 152 for(G4int j=2; j<100; ++j) {
153 G4double x = fG4pow->Z13(j); 153 G4double x = fG4pow->Z13(j);
154 ScreenRSquare[j] = afact*(1 + G4Exp(-j*j 154 ScreenRSquare[j] = afact*(1 + G4Exp(-j*j*0.001))*x*x;
155 ScreenRSquareElec[j] = afact*x*x; 155 ScreenRSquareElec[j] = afact*x*x;
156 x = fNistManager->GetA27(j); 156 x = fNistManager->GetA27(j);
157 FormFactor[j] = constn*x*x; 157 FormFactor[j] = constn*x*x;
158 } 158 }
159 } 159 }
160 l.unlock(); 160 l.unlock();
161 } 161 }
162 162
163 //....oooOO0OOooo........oooOO0OOooo........oo 163 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
164 164
165 void G4WentzelOKandVIxSection::SetupParticle(c 165 void G4WentzelOKandVIxSection::SetupParticle(const G4ParticleDefinition* p)
166 { 166 {
167 particle = p; 167 particle = p;
168 mass = particle->GetPDGMass(); 168 mass = particle->GetPDGMass();
169 spin = particle->GetPDGSpin(); 169 spin = particle->GetPDGSpin();
170 if(0.0 != spin) { spin = 0.5; } 170 if(0.0 != spin) { spin = 0.5; }
171 G4double q = std::abs(particle->GetPDGCharge 171 G4double q = std::abs(particle->GetPDGCharge()/eplus);
172 chargeSquare = q*q; 172 chargeSquare = q*q;
173 charge3 = chargeSquare*q; 173 charge3 = chargeSquare*q;
174 tkin = 0.0; 174 tkin = 0.0;
175 currentMaterial = nullptr; 175 currentMaterial = nullptr;
176 targetZ = 0; 176 targetZ = 0;
177 } 177 }
178 178
179 //....oooOO0OOooo........oooOO0OOooo........oo 179 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
180 180
181 G4double 181 G4double
182 G4WentzelOKandVIxSection::SetupKinematic(G4dou 182 G4WentzelOKandVIxSection::SetupKinematic(G4double ekin, const G4Material* mat)
183 { 183 {
184 if(ekin != tkin || mat != currentMaterial) { 184 if(ekin != tkin || mat != currentMaterial) {
185 currentMaterial = mat; 185 currentMaterial = mat;
186 tkin = ekin; 186 tkin = ekin;
187 mom2 = tkin*(tkin + 2.0*mass); 187 mom2 = tkin*(tkin + 2.0*mass);
188 invbeta2 = 1.0 + mass*mass/mom2; 188 invbeta2 = 1.0 + mass*mass/mom2;
189 factB = spin/invbeta2; 189 factB = spin/invbeta2;
190 cosTetMaxNuc = isCombined ? 190 cosTetMaxNuc = isCombined ?
191 std::max(cosThetaMax, 1.-factorA2*mat->G 191 std::max(cosThetaMax, 1.-factorA2*mat->GetIonisation()->GetInvA23()/mom2)
192 : cosThetaMax; 192 : cosThetaMax;
193 } 193 }
194 return cosTetMaxNuc; 194 return cosTetMaxNuc;
195 } 195 }
196 196
197 //....oooOO0OOooo........oooOO0OOooo........oo 197 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
198 198
199 G4double 199 G4double
200 G4WentzelOKandVIxSection::SetupTarget(G4int Z, 200 G4WentzelOKandVIxSection::SetupTarget(G4int Z, G4double cut)
201 { 201 {
202 G4double cosTetMaxNuc2 = cosTetMaxNuc; 202 G4double cosTetMaxNuc2 = cosTetMaxNuc;
203 if(Z != targetZ || tkin != etag) { 203 if(Z != targetZ || tkin != etag) {
204 etag = tkin; 204 etag = tkin;
205 targetZ = std::min(Z, 99); 205 targetZ = std::min(Z, 99);
206 G4double massT = (1 == Z) ? CLHEP::proton_ 206 G4double massT = (1 == Z) ? CLHEP::proton_mass_c2 :
207 fNistManager->GetAtomicMassAmu(Z)*CLHEP: 207 fNistManager->GetAtomicMassAmu(Z)*CLHEP::amu_c2;
208 SetTargetMass(massT); 208 SetTargetMass(massT);
209 209
210 kinFactor = coeff*Z*chargeSquare*invbeta2/ 210 kinFactor = coeff*Z*chargeSquare*invbeta2/mom2;
211 if(particle == theElectron && fMottXSectio 211 if(particle == theElectron && fMottXSection) {
212 fMottFactor = (1.0 + 2.0e-4*Z*Z); 212 fMottFactor = (1.0 + 2.0e-4*Z*Z);
213 } 213 }
214 214
215 if(1 == Z) { 215 if(1 == Z) {
216 screenZ = ScreenRSquare[targetZ]/mom2; 216 screenZ = ScreenRSquare[targetZ]/mom2;
217 } else if(mass > MeV) { 217 } else if(mass > MeV) {
218 screenZ = std::min(Z*1.13,1.13 +3.76*Z*Z 218 screenZ = std::min(Z*1.13,1.13 +3.76*Z*Z*invbeta2*alpha2*chargeSquare)*
219 ScreenRSquare[targetZ]/mom2; 219 ScreenRSquare[targetZ]/mom2;
220 } else { 220 } else {
221 G4double tau = tkin/mass; 221 G4double tau = tkin/mass;
222 screenZ = std::min(Z*1.13,(1.13 +3.76*Z* 222 screenZ = std::min(Z*1.13,(1.13 +3.76*Z*Z
223 *invbeta2*alpha2*std::sqrt(tau/(tau 223 *invbeta2*alpha2*std::sqrt(tau/(tau + fG4pow->Z23(targetZ)))))*
224 ScreenRSquareElec[targetZ]/mom2; 224 ScreenRSquareElec[targetZ]/mom2;
225 } 225 }
226 if(targetZ == 1 && particle == theProton & 226 if(targetZ == 1 && particle == theProton && cosTetMaxNuc2 < 0.0) {
227 cosTetMaxNuc2 = 0.0; 227 cosTetMaxNuc2 = 0.0;
228 } 228 }
229 formfactA = FormFactor[targetZ]*mom2; 229 formfactA = FormFactor[targetZ]*mom2;
230 230
231 cosTetMaxElec = 1.0; 231 cosTetMaxElec = 1.0;
232 ComputeMaxElectronScattering(cut); 232 ComputeMaxElectronScattering(cut);
233 } 233 }
234 //G4cout << "SetupTarget: Z= " << targetZ < 234 //G4cout << "SetupTarget: Z= " << targetZ << " kinFactor= " << kinFactor
235 // << " fMottFactor= " << fMottFactor << " 235 // << " fMottFactor= " << fMottFactor << " screenZ= " << screenZ <<G4endl;
236 return cosTetMaxNuc2; 236 return cosTetMaxNuc2;
237 } 237 }
238 238
239 //....oooOO0OOooo........oooOO0OOooo........oo 239 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
240 240
241 G4double 241 G4double
242 G4WentzelOKandVIxSection::ComputeTransportCros 242 G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom(G4double cosTMax)
243 { 243 {
244 G4double xSection = 0.0; 244 G4double xSection = 0.0;
245 if(cosTMax >= 1.0) { return xSection; } 245 if(cosTMax >= 1.0) { return xSection; }
246 246
247 G4double costm = std::max(cosTMax,cosTetMaxE 247 G4double costm = std::max(cosTMax,cosTetMaxElec);
248 G4double fb = screenZ*factB; 248 G4double fb = screenZ*factB;
249 249
250 // scattering off electrons 250 // scattering off electrons
251 if(costm < 1.0) { 251 if(costm < 1.0) {
252 G4double x = (1.0 - costm)/screenZ; 252 G4double x = (1.0 - costm)/screenZ;
253 if(x < numlimit) { 253 if(x < numlimit) {
254 G4double x2 = 0.5*x*x; 254 G4double x2 = 0.5*x*x;
255 xSection = x2*((1.0 - 1.3333333*x + 3*x2 255 xSection = x2*((1.0 - 1.3333333*x + 3*x2) - fb*x*(0.6666667 - x));
256 } else { 256 } else {
257 G4double x1= x/(1 + x); 257 G4double x1= x/(1 + x);
258 G4double xlog = G4Log(1.0 + x); 258 G4double xlog = G4Log(1.0 + x);
259 xSection = xlog - x1 - fb*(x + x1 - 2*xl 259 xSection = xlog - x1 - fb*(x + x1 - 2*xlog);
260 } 260 }
261 261
262 if(xSection < 0.0) { 262 if(xSection < 0.0) {
263 ++nwarnings; 263 ++nwarnings;
264 if(nwarnings < nwarnlimit) { 264 if(nwarnings < nwarnlimit) {
265 G4cout << "G4WentzelOKandVIxSection::C 265 G4cout << "G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom"
266 << " scattering on e- <0" 266 << " scattering on e- <0"
267 << G4endl; 267 << G4endl;
268 G4cout << "cross= " << xSection 268 G4cout << "cross= " << xSection
269 << " e(MeV)= " << tkin << " p(M 269 << " e(MeV)= " << tkin << " p(MeV/c)= " << sqrt(mom2)
270 << " Z= " << targetZ << " " 270 << " Z= " << targetZ << " "
271 << particle->GetParticleName() 271 << particle->GetParticleName() << G4endl;
272 G4cout << " 1-costm= " << 1.0-costm << 272 G4cout << " 1-costm= " << 1.0-costm << " screenZ= " << screenZ
273 << " x= " << x << G4endl; 273 << " x= " << x << G4endl;
274 } 274 }
275 xSection = 0.0; 275 xSection = 0.0;
276 } 276 }
277 } 277 }
278 /* 278 /*
279 G4cout << "G4WentzelOKandVIxSection::Com 279 G4cout << "G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom: \n"
280 << " Z= " << targetZ 280 << " Z= " << targetZ
281 << " e(MeV)= " << tkin/MeV << " XSel= " 281 << " e(MeV)= " << tkin/MeV << " XSel= " << xSection
282 << " zmaxE= " << (1.0 - cosTetMaxElec)/s 282 << " zmaxE= " << (1.0 - cosTetMaxElec)/screenZ
283 << " zmaxN= " << (1.0 - cosThetaMax)/scr 283 << " zmaxN= " << (1.0 - cosThetaMax)/screenZ
284 << " 1-costm= " << 1.0 - cosThetaMax << 284 << " 1-costm= " << 1.0 - cosThetaMax << G4endl;
285 */ 285 */
286 // scattering off nucleus 286 // scattering off nucleus
287 if(cosTMax < 1.0) { 287 if(cosTMax < 1.0) {
288 G4double x = (1.0 - cosTMax)/screenZ; 288 G4double x = (1.0 - cosTMax)/screenZ;
289 G4double y; 289 G4double y;
290 if(x < numlimit) { 290 if(x < numlimit) {
291 G4double x2 = 0.5*x*x; 291 G4double x2 = 0.5*x*x;
292 y = x2*((1.0 - 1.3333333*x + 3*x2) - fb* 292 y = x2*((1.0 - 1.3333333*x + 3*x2) - fb*x*(0.6666667 - x));
293 } else { 293 } else {
294 G4double x1= x/(1 + x); 294 G4double x1= x/(1 + x);
295 G4double xlog = G4Log(1.0 + x); 295 G4double xlog = G4Log(1.0 + x);
296 y = xlog - x1 - fb*(x + x1 - 2*xlog); 296 y = xlog - x1 - fb*(x + x1 - 2*xlog);
297 } 297 }
298 298
299 if(y < 0.0) { 299 if(y < 0.0) {
300 ++nwarnings; 300 ++nwarnings;
301 if(nwarnings < nwarnlimit) { 301 if(nwarnings < nwarnlimit) {
302 G4cout << "G4WentzelOKandVIxSection::C 302 G4cout << "G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom"
303 << " scattering on nucleus <0" 303 << " scattering on nucleus <0"
304 << G4endl; 304 << G4endl;
305 G4cout << "y= " << y 305 G4cout << "y= " << y
306 << " e(MeV)= " << tkin << " Z= 306 << " e(MeV)= " << tkin << " Z= " << targetZ << " "
307 << particle->GetParticleName() 307 << particle->GetParticleName() << G4endl;
308 G4cout << " formfactA= " << formfactA 308 G4cout << " formfactA= " << formfactA << " screenZ= " << screenZ
309 << " x= " << x <<G4endl; 309 << " x= " << x <<G4endl;
310 } 310 }
311 y = 0.0; 311 y = 0.0;
312 } 312 }
313 xSection += y*targetZ; 313 xSection += y*targetZ;
314 } 314 }
315 xSection *= kinFactor; 315 xSection *= kinFactor;
316 316
317 /* 317 /*
318 G4cout << "Z= " << targetZ << " XStot= " << 318 G4cout << "Z= " << targetZ << " XStot= " << xSection/barn
319 << " screenZ= " << screenZ << " formF 319 << " screenZ= " << screenZ << " formF= " << formfactA
320 << " for " << particle->GetParticleNa 320 << " for " << particle->GetParticleName()
321 << " m= " << mass << " 1/v= " << sqrt(invbe 321 << " m= " << mass << " 1/v= " << sqrt(invbeta2)
322 << " p= " << sqrt(mom2) 322 << " p= " << sqrt(mom2)
323 << " x= " << x << G4endl; 323 << " x= " << x << G4endl;
324 */ 324 */
325 return xSection; 325 return xSection;
326 } 326 }
327 327
328 //....oooOO0OOooo........oooOO0OOooo........oo 328 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
329 329
330 G4ThreeVector& 330 G4ThreeVector&
331 G4WentzelOKandVIxSection::SampleSingleScatteri 331 G4WentzelOKandVIxSection::SampleSingleScattering(G4double cosTMin,
332 332 G4double cosTMax,
333 333 G4double elecRatio)
334 { 334 {
335 temp.set(0.0,0.0,1.0); 335 temp.set(0.0,0.0,1.0);
336 CLHEP::HepRandomEngine* rndmEngineMod = G4Ra 336 CLHEP::HepRandomEngine* rndmEngineMod = G4Random::getTheEngine();
337 337
338 G4double formf = formfactA; 338 G4double formf = formfactA;
339 G4double cost1 = cosTMin; 339 G4double cost1 = cosTMin;
340 G4double cost2 = cosTMax; 340 G4double cost2 = cosTMax;
341 if(elecRatio > 0.0) { 341 if(elecRatio > 0.0) {
342 if(rndmEngineMod->flat() <= elecRatio) { 342 if(rndmEngineMod->flat() <= elecRatio) {
343 formf = 0.0; 343 formf = 0.0;
344 cost1 = std::max(cost1,cosTetMaxElec); 344 cost1 = std::max(cost1,cosTetMaxElec);
345 cost2 = std::max(cost2,cosTetMaxElec); 345 cost2 = std::max(cost2,cosTetMaxElec);
346 } 346 }
347 } 347 }
348 if(cost1 > cost2) { 348 if(cost1 > cost2) {
349 G4double w1 = 1. - cost1; <<
350 G4double w2 = 1. - cost2; <<
351 G4double w3 = rndmEngineMod->flat()*(w2 - <<
352 G4double z1 = ((w2 - w3)*screenZ + w1*w2)/ <<
353 G4double fm = 1.0; <<
354 349
>> 350 G4double w1 = 1. - cost1 + screenZ;
>> 351 G4double w2 = 1. - cost2 + screenZ;
>> 352 G4double z1 = w1*w2/(w1 + rndmEngineMod->flat()*(w2 - w1)) - screenZ;
>> 353
>> 354 G4double fm = 1.0;
355 if(fNucFormfactor == fExponentialNF) { 355 if(fNucFormfactor == fExponentialNF) {
356 fm += formf*z1; 356 fm += formf*z1;
357 fm = 1.0/(fm*fm); 357 fm = 1.0/(fm*fm);
358 } else if(fNucFormfactor == fGaussianNF) { 358 } else if(fNucFormfactor == fGaussianNF) {
359 fm = G4Exp(-2*formf*z1); 359 fm = G4Exp(-2*formf*z1);
360 } else if(fNucFormfactor == fFlatNF) { 360 } else if(fNucFormfactor == fFlatNF) {
361 static const G4double ccoef = 0.00508/CL << 361 static const G4double ccoef = 0.00508/MeV;
362 G4double x = std::sqrt(2.*mom2*z1)*ccoef 362 G4double x = std::sqrt(2.*mom2*z1)*ccoef*2.;
363 fm = FlatFormfactor(x); 363 fm = FlatFormfactor(x);
364 fm *= FlatFormfactor(x*0.6*fG4pow->A13(f << 364 fm *= FlatFormfactor(x*0.6
>> 365 *fG4pow->A13(fNistManager->GetAtomicMassAmu(targetZ)));
365 } 366 }
366 // G4cout << " fm=" << fm << " " << fMott <<
367 G4double grej; 367 G4double grej;
368 if(nullptr != fMottXSection) { << 368 if(fMottXSection) {
369 fMottXSection->SetupKinematic(tkin, targ 369 fMottXSection->SetupKinematic(tkin, targetZ);
370 grej = fMottXSection->RatioMottRutherfor << 370 grej = fMottXSection->RatioMottRutherfordCosT(std::sqrt(z1))*fm*fm;
371 } else { 371 } else {
372 grej = (1. - z1*factB + factB1*targetZ*s 372 grej = (1. - z1*factB + factB1*targetZ*sqrt(z1*factB)*(2. - z1))
373 *fm/(1.0 + z1*factD); << 373 *fm*fm/(1.0 + z1*factD);
374 } 374 }
>> 375 // G4cout << "SampleSingleScattering: E= " << tkin << " z1= "
>> 376 // << z1 << " grej= "<< grej << " mottFact= "<< fMottFactor<< G4endl;
375 if(fMottFactor*rndmEngineMod->flat() <= gr 377 if(fMottFactor*rndmEngineMod->flat() <= grej ) {
376 // exclude "false" scattering due to for 378 // exclude "false" scattering due to formfactor and spin effect
377 G4double cost = 1.0 - z1; 379 G4double cost = 1.0 - z1;
378 if(cost > 1.0) { cost = 1.0; } 380 if(cost > 1.0) { cost = 1.0; }
379 else if(cost < -1.0) { cost =-1.0; } 381 else if(cost < -1.0) { cost =-1.0; }
380 G4double sint = sqrt((1.0 - cost)*(1.0 + 382 G4double sint = sqrt((1.0 - cost)*(1.0 + cost));
381 //G4cout << "sint= " << sint << G4endl; 383 //G4cout << "sint= " << sint << G4endl;
382 G4double phi = twopi*rndmEngineMod->fla 384 G4double phi = twopi*rndmEngineMod->flat();
383 temp.set(sint*cos(phi),sint*sin(phi),cos 385 temp.set(sint*cos(phi),sint*sin(phi),cost);
384 } 386 }
385 } 387 }
386 return temp; 388 return temp;
387 } 389 }
388 390
389 //....oooOO0OOooo........oooOO0OOooo........oo 391 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
390 392
391 void 393 void
392 G4WentzelOKandVIxSection::ComputeMaxElectronSc 394 G4WentzelOKandVIxSection::ComputeMaxElectronScattering(G4double cutEnergy)
393 { 395 {
394 if(mass > MeV) { 396 if(mass > MeV) {
395 G4double ratio = electron_mass_c2/mass; 397 G4double ratio = electron_mass_c2/mass;
396 G4double tau = tkin/mass; 398 G4double tau = tkin/mass;
397 G4double tmax = 2.0*electron_mass_c2*tau*( 399 G4double tmax = 2.0*electron_mass_c2*tau*(tau + 2.)/
398 (1.0 + 2.0*ratio*(tau + 1.0) + ratio*rat 400 (1.0 + 2.0*ratio*(tau + 1.0) + ratio*ratio);
399 cosTetMaxElec = 1.0 - std::min(cutEnergy, 401 cosTetMaxElec = 1.0 - std::min(cutEnergy, tmax)*electron_mass_c2/mom2;
400 } else { 402 } else {
401 403
402 G4double tmax = (particle == theElectron) 404 G4double tmax = (particle == theElectron) ? 0.5*tkin : tkin;
403 G4double t = std::min(cutEnergy, tmax); 405 G4double t = std::min(cutEnergy, tmax);
404 G4double mom21 = t*(t + 2.0*electron_mass_ 406 G4double mom21 = t*(t + 2.0*electron_mass_c2);
405 G4double t1 = tkin - t; 407 G4double t1 = tkin - t;
406 //G4cout <<"tkin=" <<tkin<<" tmax= "<<tmax 408 //G4cout <<"tkin=" <<tkin<<" tmax= "<<tmax<<" t= "
407 //<<t<< " t1= "<<t1<<" cut= "<<ecut<<G4end 409 //<<t<< " t1= "<<t1<<" cut= "<<ecut<<G4endl;
408 if(t1 > 0.0) { 410 if(t1 > 0.0) {
409 G4double mom22 = t1*(t1 + 2.0*mass); 411 G4double mom22 = t1*(t1 + 2.0*mass);
410 G4double ctm = (mom2 + mom22 - mom21)*0. 412 G4double ctm = (mom2 + mom22 - mom21)*0.5/sqrt(mom2*mom22);
411 if(ctm < 1.0) { cosTetMaxElec = ctm; } 413 if(ctm < 1.0) { cosTetMaxElec = ctm; }
412 if(particle == theElectron && cosTetMaxE 414 if(particle == theElectron && cosTetMaxElec < 0.0) {
413 cosTetMaxElec = 0.0; 415 cosTetMaxElec = 0.0;
414 } 416 }
415 } 417 }
416 } 418 }
417 } 419 }
418 420
419 //....oooOO0OOooo........oooOO0OOooo........oo 421 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
420 422
421 G4double 423 G4double
422 G4WentzelOKandVIxSection::ComputeSecondTranspo 424 G4WentzelOKandVIxSection::ComputeSecondTransportMoment(G4double /*CosThetaMax*/)
423 { 425 {
424 return 0.0; 426 return 0.0;
425 } 427 }
426 428
427 //....oooOO0OOooo........oooOO0OOooo........oo 429 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
428 430