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>> 26 // $Id: G4WentzelOKandVIxSection.cc 98737 2016-08-09 12:51:38Z gcosmo $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class file 30 // GEANT4 Class file
30 // 31 //
31 // 32 //
32 // File name: G4WentzelOKandVIxSection 33 // File name: G4WentzelOKandVIxSection
33 // 34 //
34 // Author: V.Ivanchenko 35 // Author: V.Ivanchenko
35 // 36 //
36 // Creation date: 09.04.2008 from G4MuMscModel 37 // Creation date: 09.04.2008 from G4MuMscModel
37 // 38 //
38 // Modifications: 39 // Modifications:
39 // 40 //
40 // ------------------------------------------- 41 // -------------------------------------------------------------------
41 // 42 //
42 43
43 //....oooOO0OOooo........oooOO0OOooo........oo 44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
44 //....oooOO0OOooo........oooOO0OOooo........oo 45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
45 46
46 #include "G4WentzelOKandVIxSection.hh" 47 #include "G4WentzelOKandVIxSection.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" <<
58 57
59 //....oooOO0OOooo........oooOO0OOooo........oo 58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
60 59
61 G4double G4WentzelOKandVIxSection::ScreenRSqua 60 G4double G4WentzelOKandVIxSection::ScreenRSquareElec[] = {0.0};
62 G4double G4WentzelOKandVIxSection::ScreenRSqua 61 G4double G4WentzelOKandVIxSection::ScreenRSquare[] = {0.0};
63 G4double G4WentzelOKandVIxSection::FormFactor[ 62 G4double G4WentzelOKandVIxSection::FormFactor[] = {0.0};
64 63
65 namespace <<
66 { <<
67 G4Mutex theWOKVIMutex = G4MUTEX_INITIALIZER; <<
68 } <<
69 <<
70 const G4double alpha2 = CLHEP::fine_structure_ <<
71 const G4double factB1= 0.5*CLHEP::pi*CLHEP::fi <<
72 const G4double numlimit = 0.1; <<
73 const G4int nwarnlimit = 50; <<
74 <<
75 using namespace std; 64 using namespace std;
76 65
77 G4WentzelOKandVIxSection::G4WentzelOKandVIxSec << 66 G4WentzelOKandVIxSection::G4WentzelOKandVIxSection(G4bool combined) :
78 temp(0.,0.,0.), 67 temp(0.,0.,0.),
79 isCombined(comb) << 68 numlimit(0.1),
>> 69 nwarnings(0),
>> 70 nwarnlimit(50),
>> 71 isCombined(combined),
>> 72 cosThetaMax(-1.0),
>> 73 alpha2(fine_structure_const*fine_structure_const)
80 { 74 {
81 fNistManager = G4NistManager::Instance(); 75 fNistManager = G4NistManager::Instance();
82 fG4pow = G4Pow::GetInstance(); 76 fG4pow = G4Pow::GetInstance();
83 <<
84 theElectron = G4Electron::Electron(); 77 theElectron = G4Electron::Electron();
85 thePositron = G4Positron::Positron(); 78 thePositron = G4Positron::Positron();
86 theProton = G4Proton::Proton(); 79 theProton = G4Proton::Proton();
>> 80 lowEnergyLimit = 1.0*eV;
>> 81 G4double p0 = electron_mass_c2*classic_electr_radius;
>> 82 coeff = twopi*p0*p0;
>> 83 particle = nullptr;
>> 84
>> 85 fNucFormfactor = fExponentialNF;
>> 86
>> 87 // Thomas-Fermi screening radii
>> 88 // Formfactors from A.V. Butkevich et al., NIM A 488 (2002) 282
>> 89
>> 90 if(0.0 == ScreenRSquare[0]) {
>> 91 G4double a0 = electron_mass_c2/0.88534;
>> 92 G4double constn = 6.937e-6/(MeV*MeV);
87 93
88 G4double p0 = CLHEP::electron_mass_c2*CLHEP: << 94 ScreenRSquare[0] = alpha2*a0*a0;
89 coeff = CLHEP::twopi*p0*p0; << 95 ScreenRSquareElec[0] = ScreenRSquare[0];
90 targetMass = CLHEP::proton_mass_c2; << 96 for(G4int j=1; j<100; ++j) {
>> 97 G4double x = a0*fG4pow->Z13(j);
>> 98 if(1 == j) { ScreenRSquare[j] = 0.5*alpha2*a0*a0; }
>> 99 else {
>> 100 ScreenRSquare[j] = 0.5*(1 + G4Exp(-j*j*0.001))*alpha2*x*x;
>> 101 ScreenRSquareElec[j] = 0.5*alpha2*x*x;
>> 102 }
>> 103 x = fNistManager->GetA27(j);
>> 104 FormFactor[j] = constn*x*x;
>> 105 }
>> 106 }
>> 107 currentMaterial = 0;
>> 108 factB = factD = formfactA = screenZ = 0.0;
>> 109 cosTetMaxElec = cosTetMaxNuc = invbeta2 = kinFactor = gam0pcmp = pcmp2 = 1.0;
>> 110
>> 111 factB1= 0.5*CLHEP::pi*fine_structure_const;
>> 112
>> 113 tkin = mom2 = momCM2 = factorA2 = mass = spin = chargeSquare = charge3 = 0.0;
>> 114 ecut = etag = DBL_MAX;
>> 115 targetZ = 0;
>> 116 targetMass = proton_mass_c2;
>> 117 particle = nullptr;
91 } 118 }
92 119
93 //....oooOO0OOooo........oooOO0OOooo........oo 120 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
94 121
95 G4WentzelOKandVIxSection::~G4WentzelOKandVIxSe 122 G4WentzelOKandVIxSection::~G4WentzelOKandVIxSection()
96 { << 123 {}
97 delete fMottXSection; <<
98 } <<
99 124
100 //....oooOO0OOooo........oooOO0OOooo........oo 125 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
101 126
102 void G4WentzelOKandVIxSection::Initialise(cons 127 void G4WentzelOKandVIxSection::Initialise(const G4ParticleDefinition* p,
103 G4do 128 G4double cosThetaLim)
104 { 129 {
105 SetupParticle(p); 130 SetupParticle(p);
106 tkin = mom2 = momCM2 = 0.0; 131 tkin = mom2 = momCM2 = 0.0;
107 ecut = etag = DBL_MAX; 132 ecut = etag = DBL_MAX;
108 targetZ = 0; 133 targetZ = 0;
109 134
110 // cosThetaMax is below 1.0 only when MSC is 135 // cosThetaMax is below 1.0 only when MSC is combined with SS
111 if(isCombined) { cosThetaMax = cosThetaLim; << 136 if(isCombined) { cosThetaMax = cosThetaLim; }
112 G4EmParameters* param = G4EmParameters::Inst << 137
113 G4double a = param->FactorForAngleLimit()*CL << 138 G4double a = G4EmParameters::Instance()->FactorForAngleLimit()
>> 139 *CLHEP::hbarc/CLHEP::fermi;
114 factorA2 = 0.5*a*a; 140 factorA2 = 0.5*a*a;
115 currentMaterial = nullptr; 141 currentMaterial = nullptr;
116 142
117 fNucFormfactor = param->NuclearFormfactorTyp << 143 fNucFormfactor = G4EmParameters::Instance()->NuclearFormfactorType();
118 if(0.0 == ScreenRSquare[0]) { InitialiseA(); << 144
119 << 145 //G4cout << "G4WentzelOKandVIxSection::Initialise mass= " << mass
120 // Mott corrections always added << 146 // << " " << p->GetParticleName()
121 if((p == theElectron || p == thePositron) && << 147 // << " cosThetaMax= " << cosThetaMax << G4endl;
122 fMottXSection = new G4ScreeningMottCrossSe << 148
123 fMottXSection->Initialise(p, 1.0); <<
124 } <<
125 /* <<
126 G4cout << "G4WentzelOKandVIxSection::Initial <<
127 << p->GetParticleName() << " cosThetaMax= " <<
128 << " " << ScreenRSquare[0] << " coeff= " < <<
129 */ <<
130 } <<
131 <<
132 //....oooOO0OOooo........oooOO0OOooo........oo <<
133 <<
134 void G4WentzelOKandVIxSection::InitialiseA() <<
135 { <<
136 // Thomas-Fermi screening radii <<
137 // Formfactors from A.V. Butkevich et al., N <<
138 if(0.0 != ScreenRSquare[0]) { return; } <<
139 G4AutoLock l(&theWOKVIMutex); <<
140 if(0.0 == ScreenRSquare[0]) { <<
141 const G4double invmev2 = 1./(CLHEP::MeV*CL <<
142 G4double a0 = CLHEP::electron_mass_c2/0.88 <<
143 G4double constn = 6.937e-6*invmev2; <<
144 G4double fct = G4EmParameters::Instance()- <<
145 <<
146 G4double afact = 0.5*fct*alpha2*a0*a0; <<
147 ScreenRSquare[0] = afact; <<
148 ScreenRSquare[1] = afact; <<
149 ScreenRSquareElec[1] = afact; <<
150 FormFactor[1] = 3.097e-6*invmev2; <<
151 <<
152 for(G4int j=2; j<100; ++j) { <<
153 G4double x = fG4pow->Z13(j); <<
154 ScreenRSquare[j] = afact*(1 + G4Exp(-j*j <<
155 ScreenRSquareElec[j] = afact*x*x; <<
156 x = fNistManager->GetA27(j); <<
157 FormFactor[j] = constn*x*x; <<
158 } <<
159 } <<
160 l.unlock(); <<
161 } 149 }
162 150
163 //....oooOO0OOooo........oooOO0OOooo........oo 151 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
164 152
165 void G4WentzelOKandVIxSection::SetupParticle(c 153 void G4WentzelOKandVIxSection::SetupParticle(const G4ParticleDefinition* p)
166 { 154 {
167 particle = p; 155 particle = p;
168 mass = particle->GetPDGMass(); 156 mass = particle->GetPDGMass();
169 spin = particle->GetPDGSpin(); 157 spin = particle->GetPDGSpin();
170 if(0.0 != spin) { spin = 0.5; } 158 if(0.0 != spin) { spin = 0.5; }
171 G4double q = std::abs(particle->GetPDGCharge << 159 G4double q = std::fabs(particle->GetPDGCharge()/eplus);
172 chargeSquare = q*q; 160 chargeSquare = q*q;
173 charge3 = chargeSquare*q; 161 charge3 = chargeSquare*q;
174 tkin = 0.0; 162 tkin = 0.0;
175 currentMaterial = nullptr; << 163 currentMaterial = 0;
176 targetZ = 0; 164 targetZ = 0;
177 } 165 }
178 166
179 //....oooOO0OOooo........oooOO0OOooo........oo 167 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
180 <<
181 G4double <<
182 G4WentzelOKandVIxSection::SetupKinematic(G4dou <<
183 { <<
184 if(ekin != tkin || mat != currentMaterial) { <<
185 currentMaterial = mat; <<
186 tkin = ekin; <<
187 mom2 = tkin*(tkin + 2.0*mass); <<
188 invbeta2 = 1.0 + mass*mass/mom2; <<
189 factB = spin/invbeta2; <<
190 cosTetMaxNuc = isCombined ? <<
191 std::max(cosThetaMax, 1.-factorA2*mat->G <<
192 : cosThetaMax; <<
193 } <<
194 return cosTetMaxNuc; <<
195 } <<
196 <<
197 //....oooOO0OOooo........oooOO0OOooo........oo <<
198 168
199 G4double 169 G4double
200 G4WentzelOKandVIxSection::SetupTarget(G4int Z, 170 G4WentzelOKandVIxSection::SetupTarget(G4int Z, G4double cut)
201 { 171 {
202 G4double cosTetMaxNuc2 = cosTetMaxNuc; 172 G4double cosTetMaxNuc2 = cosTetMaxNuc;
203 if(Z != targetZ || tkin != etag) { 173 if(Z != targetZ || tkin != etag) {
204 etag = tkin; 174 etag = tkin;
205 targetZ = std::min(Z, 99); << 175 targetZ = Z;
206 G4double massT = (1 == Z) ? CLHEP::proton_ << 176 if(targetZ > 99) { targetZ = 99; }
207 fNistManager->GetAtomicMassAmu(Z)*CLHEP: << 177 G4double massT = proton_mass_c2;
>> 178 if(targetZ > 1) {
>> 179 massT = fNistManager->GetAtomicMassAmu(targetZ)*CLHEP::amu_c2;
>> 180 }
208 SetTargetMass(massT); 181 SetTargetMass(massT);
209 182
210 kinFactor = coeff*Z*chargeSquare*invbeta2/ 183 kinFactor = coeff*Z*chargeSquare*invbeta2/mom2;
211 if(particle == theElectron && fMottXSectio <<
212 fMottFactor = (1.0 + 2.0e-4*Z*Z); <<
213 } <<
214 184
215 if(1 == Z) { 185 if(1 == Z) {
216 screenZ = ScreenRSquare[targetZ]/mom2; 186 screenZ = ScreenRSquare[targetZ]/mom2;
217 } else if(mass > MeV) { 187 } else if(mass > MeV) {
218 screenZ = std::min(Z*1.13,1.13 +3.76*Z*Z 188 screenZ = std::min(Z*1.13,1.13 +3.76*Z*Z*invbeta2*alpha2*chargeSquare)*
219 ScreenRSquare[targetZ]/mom2; 189 ScreenRSquare[targetZ]/mom2;
220 } else { 190 } else {
221 G4double tau = tkin/mass; 191 G4double tau = tkin/mass;
222 screenZ = std::min(Z*1.13,(1.13 +3.76*Z* 192 screenZ = std::min(Z*1.13,(1.13 +3.76*Z*Z
223 *invbeta2*alpha2*std::sqrt(tau/(tau 193 *invbeta2*alpha2*std::sqrt(tau/(tau + fG4pow->Z23(targetZ)))))*
224 ScreenRSquareElec[targetZ]/mom2; 194 ScreenRSquareElec[targetZ]/mom2;
225 } 195 }
226 if(targetZ == 1 && particle == theProton & << 196 if(targetZ == 1 && cosTetMaxNuc2 < 0.0 && particle == theProton) {
227 cosTetMaxNuc2 = 0.0; 197 cosTetMaxNuc2 = 0.0;
228 } 198 }
229 formfactA = FormFactor[targetZ]*mom2; 199 formfactA = FormFactor[targetZ]*mom2;
230 200
231 cosTetMaxElec = 1.0; 201 cosTetMaxElec = 1.0;
232 ComputeMaxElectronScattering(cut); 202 ComputeMaxElectronScattering(cut);
233 } 203 }
234 //G4cout << "SetupTarget: Z= " << targetZ < <<
235 // << " fMottFactor= " << fMottFactor << " <<
236 return cosTetMaxNuc2; 204 return cosTetMaxNuc2;
237 } 205 }
238 206
239 //....oooOO0OOooo........oooOO0OOooo........oo 207 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
240 208
241 G4double 209 G4double
242 G4WentzelOKandVIxSection::ComputeTransportCros 210 G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom(G4double cosTMax)
243 { 211 {
244 G4double xSection = 0.0; 212 G4double xSection = 0.0;
245 if(cosTMax >= 1.0) { return xSection; } 213 if(cosTMax >= 1.0) { return xSection; }
>> 214
>> 215 G4double x = 0;
>> 216 G4double y = 0;
>> 217 G4double x1= 0;
>> 218 G4double x2= 0;
>> 219 G4double xlog = 0.0;
246 220
247 G4double costm = std::max(cosTMax,cosTetMaxE 221 G4double costm = std::max(cosTMax,cosTetMaxElec);
248 G4double fb = screenZ*factB; 222 G4double fb = screenZ*factB;
249 223
250 // scattering off electrons 224 // scattering off electrons
251 if(costm < 1.0) { 225 if(costm < 1.0) {
252 G4double x = (1.0 - costm)/screenZ; << 226 x = (1.0 - costm)/screenZ;
253 if(x < numlimit) { 227 if(x < numlimit) {
254 G4double x2 = 0.5*x*x; << 228 x2 = 0.5*x*x;
255 xSection = x2*((1.0 - 1.3333333*x + 3*x2 << 229 y = x2*(1.0 - 1.3333333*x + 3*x2);
>> 230 if(0.0 < factB) { y -= fb*x2*x*(0.6666667 - x); }
256 } else { 231 } else {
257 G4double x1= x/(1 + x); << 232 x1= x/(1 + x);
258 G4double xlog = G4Log(1.0 + x); << 233 xlog = G4Log(1.0 + x);
259 xSection = xlog - x1 - fb*(x + x1 - 2*xl << 234 y = xlog - x1;
>> 235 if(0.0 < factB) { y -= fb*(x + x1 - 2*xlog); }
260 } 236 }
261 237
262 if(xSection < 0.0) { << 238 if(y < 0.0) {
263 ++nwarnings; 239 ++nwarnings;
264 if(nwarnings < nwarnlimit) { 240 if(nwarnings < nwarnlimit) {
265 G4cout << "G4WentzelOKandVIxSection::C 241 G4cout << "G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom"
266 << " scattering on e- <0" 242 << " scattering on e- <0"
267 << G4endl; 243 << G4endl;
268 G4cout << "cross= " << xSection << 244 G4cout << "y= " << y
269 << " e(MeV)= " << tkin << " p(M 245 << " e(MeV)= " << tkin << " p(MeV/c)= " << sqrt(mom2)
270 << " Z= " << targetZ << " " 246 << " Z= " << targetZ << " "
271 << particle->GetParticleName() 247 << particle->GetParticleName() << G4endl;
272 G4cout << " 1-costm= " << 1.0-costm << 248 G4cout << " 1-costm= " << 1.0-costm << " screenZ= " << screenZ
273 << " x= " << x << G4endl; 249 << " x= " << x << G4endl;
274 } 250 }
275 xSection = 0.0; << 251 y = 0.0;
276 } 252 }
>> 253 xSection = y;
277 } 254 }
278 /* << 255 /*
279 G4cout << "G4WentzelOKandVIxSection::Com << 256 G4cout << "G4WentzelVI:XS per A " << " Z= " << targetZ
280 << " Z= " << targetZ << 257 << " e(MeV)= " << tkin/MeV << " XSel= " << xSection
281 << " e(MeV)= " << tkin/MeV << " XSel= " << 258 << " cut(MeV)= " << ecut/MeV
282 << " zmaxE= " << (1.0 - cosTetMaxElec)/s << 259 << " zmaxE= " << (1.0 - cosTetMaxElec)/screenZ
283 << " zmaxN= " << (1.0 - cosThetaMax)/scr << 260 << " zmaxN= " << (1.0 - cosThetaMax)/screenZ
284 << " 1-costm= " << 1.0 - cosThetaMax << << 261 << " 1-costm= " << 1.0 - cosThetaMax << G4endl;
285 */ 262 */
286 // scattering off nucleus 263 // scattering off nucleus
287 if(cosTMax < 1.0) { 264 if(cosTMax < 1.0) {
288 G4double x = (1.0 - cosTMax)/screenZ; << 265 x = (1.0 - cosTMax)/screenZ;
289 G4double y; <<
290 if(x < numlimit) { 266 if(x < numlimit) {
291 G4double x2 = 0.5*x*x; << 267 x2 = 0.5*x*x;
292 y = x2*((1.0 - 1.3333333*x + 3*x2) - fb* << 268 y = x2*(1.0 - 1.3333333*x + 3*x2);
>> 269 if(0.0 < factB) { y -= fb*x2*x*(0.6666667 - x); }
293 } else { 270 } else {
294 G4double x1= x/(1 + x); << 271 x1= x/(1 + x);
295 G4double xlog = G4Log(1.0 + x); << 272 xlog = G4Log(1.0 + x);
296 y = xlog - x1 - fb*(x + x1 - 2*xlog); << 273 y = xlog - x1;
>> 274 if(0.0 < factB) { y -= fb*(x + x1 - 2*xlog); }
297 } 275 }
298 276
299 if(y < 0.0) { 277 if(y < 0.0) {
300 ++nwarnings; 278 ++nwarnings;
301 if(nwarnings < nwarnlimit) { 279 if(nwarnings < nwarnlimit) {
302 G4cout << "G4WentzelOKandVIxSection::C 280 G4cout << "G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom"
303 << " scattering on nucleus <0" 281 << " scattering on nucleus <0"
304 << G4endl; 282 << G4endl;
305 G4cout << "y= " << y 283 G4cout << "y= " << y
306 << " e(MeV)= " << tkin << " Z= 284 << " e(MeV)= " << tkin << " Z= " << targetZ << " "
307 << particle->GetParticleName() 285 << particle->GetParticleName() << G4endl;
308 G4cout << " formfactA= " << formfactA 286 G4cout << " formfactA= " << formfactA << " screenZ= " << screenZ
309 << " x= " << x <<G4endl; << 287 << " x= " << " x1= " << x1 <<G4endl;
310 } 288 }
311 y = 0.0; 289 y = 0.0;
312 } 290 }
313 xSection += y*targetZ; 291 xSection += y*targetZ;
314 } 292 }
315 xSection *= kinFactor; 293 xSection *= kinFactor;
316 294
317 /* << 295 /*
318 G4cout << "Z= " << targetZ << " XStot= " << 296 G4cout << "Z= " << targetZ << " XStot= " << xSection/barn
319 << " screenZ= " << screenZ << " formF 297 << " screenZ= " << screenZ << " formF= " << formfactA
320 << " for " << particle->GetParticleNa 298 << " for " << particle->GetParticleName()
321 << " m= " << mass << " 1/v= " << sqrt(invbe << 299 << " m= " << mass << " 1/v= " << sqrt(invbeta2) << " p= " << sqrt(mom2)
322 << " p= " << sqrt(mom2) << 300 << " x= " << x
323 << " x= " << x << G4endl; << 301 << G4endl;
324 */ 302 */
325 return xSection; 303 return xSection;
326 } 304 }
327 305
328 //....oooOO0OOooo........oooOO0OOooo........oo 306 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
329 307
330 G4ThreeVector& 308 G4ThreeVector&
331 G4WentzelOKandVIxSection::SampleSingleScatteri 309 G4WentzelOKandVIxSection::SampleSingleScattering(G4double cosTMin,
332 310 G4double cosTMax,
333 311 G4double elecRatio)
334 { 312 {
335 temp.set(0.0,0.0,1.0); 313 temp.set(0.0,0.0,1.0);
336 CLHEP::HepRandomEngine* rndmEngineMod = G4Ra 314 CLHEP::HepRandomEngine* rndmEngineMod = G4Random::getTheEngine();
337 315
338 G4double formf = formfactA; 316 G4double formf = formfactA;
339 G4double cost1 = cosTMin; 317 G4double cost1 = cosTMin;
340 G4double cost2 = cosTMax; 318 G4double cost2 = cosTMax;
341 if(elecRatio > 0.0) { 319 if(elecRatio > 0.0) {
342 if(rndmEngineMod->flat() <= elecRatio) { 320 if(rndmEngineMod->flat() <= elecRatio) {
343 formf = 0.0; 321 formf = 0.0;
344 cost1 = std::max(cost1,cosTetMaxElec); 322 cost1 = std::max(cost1,cosTetMaxElec);
345 cost2 = std::max(cost2,cosTetMaxElec); 323 cost2 = std::max(cost2,cosTetMaxElec);
346 } 324 }
347 } 325 }
348 if(cost1 > cost2) { 326 if(cost1 > cost2) {
349 G4double w1 = 1. - cost1; << 327 G4double w1 = 1. - cost1 + screenZ;
350 G4double w2 = 1. - cost2; << 328 G4double w2 = 1. - cost2 + screenZ;
351 G4double w3 = rndmEngineMod->flat()*(w2 - << 329 G4double z1 = w1*w2/(w1 + rndmEngineMod->flat()*(w2 - w1)) - screenZ;
352 G4double z1 = ((w2 - w3)*screenZ + w1*w2)/ <<
353 G4double fm = 1.0; <<
354 330
>> 331 G4double fm = 1.0;
355 if(fNucFormfactor == fExponentialNF) { 332 if(fNucFormfactor == fExponentialNF) {
356 fm += formf*z1; 333 fm += formf*z1;
357 fm = 1.0/(fm*fm); 334 fm = 1.0/(fm*fm);
358 } else if(fNucFormfactor == fGaussianNF) { 335 } else if(fNucFormfactor == fGaussianNF) {
359 fm = G4Exp(-2*formf*z1); 336 fm = G4Exp(-2*formf*z1);
360 } else if(fNucFormfactor == fFlatNF) { 337 } else if(fNucFormfactor == fFlatNF) {
361 static const G4double ccoef = 0.00508/CL << 338 static const G4double ccoef = 0.00508/MeV;
362 G4double x = std::sqrt(2.*mom2*z1)*ccoef 339 G4double x = std::sqrt(2.*mom2*z1)*ccoef*2.;
363 fm = FlatFormfactor(x); 340 fm = FlatFormfactor(x);
364 fm *= FlatFormfactor(x*0.6*fG4pow->A13(f << 341 fm *= FlatFormfactor(x*0.6
>> 342 *fG4pow->A13(fNistManager->GetAtomicMassAmu(targetZ) ) );
365 } 343 }
366 // G4cout << " fm=" << fm << " " << fMott << 344
367 G4double grej; << 345 G4double grej = (1. - z1*factB + factB1*targetZ*sqrt(z1*factB)*(2. - z1))
368 if(nullptr != fMottXSection) { << 346 *fm*fm/(1.0 + z1*factD);
369 fMottXSection->SetupKinematic(tkin, targ << 347
370 grej = fMottXSection->RatioMottRutherfor << 348 if(rndmEngineMod->flat() <= grej) {
371 } else { <<
372 grej = (1. - z1*factB + factB1*targetZ*s <<
373 *fm/(1.0 + z1*factD); <<
374 } <<
375 if(fMottFactor*rndmEngineMod->flat() <= gr <<
376 // exclude "false" scattering due to for 349 // exclude "false" scattering due to formfactor and spin effect
377 G4double cost = 1.0 - z1; 350 G4double cost = 1.0 - z1;
378 if(cost > 1.0) { cost = 1.0; } 351 if(cost > 1.0) { cost = 1.0; }
379 else if(cost < -1.0) { cost =-1.0; } 352 else if(cost < -1.0) { cost =-1.0; }
380 G4double sint = sqrt((1.0 - cost)*(1.0 + 353 G4double sint = sqrt((1.0 - cost)*(1.0 + cost));
381 //G4cout << "sint= " << sint << G4endl; 354 //G4cout << "sint= " << sint << G4endl;
382 G4double phi = twopi*rndmEngineMod->fla 355 G4double phi = twopi*rndmEngineMod->flat();
383 temp.set(sint*cos(phi),sint*sin(phi),cos 356 temp.set(sint*cos(phi),sint*sin(phi),cost);
384 } 357 }
385 } 358 }
386 return temp; 359 return temp;
387 } 360 }
388 361
389 //....oooOO0OOooo........oooOO0OOooo........oo 362 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
390 363
391 void 364 void
392 G4WentzelOKandVIxSection::ComputeMaxElectronSc 365 G4WentzelOKandVIxSection::ComputeMaxElectronScattering(G4double cutEnergy)
393 { 366 {
394 if(mass > MeV) { 367 if(mass > MeV) {
395 G4double ratio = electron_mass_c2/mass; 368 G4double ratio = electron_mass_c2/mass;
396 G4double tau = tkin/mass; 369 G4double tau = tkin/mass;
397 G4double tmax = 2.0*electron_mass_c2*tau*( 370 G4double tmax = 2.0*electron_mass_c2*tau*(tau + 2.)/
398 (1.0 + 2.0*ratio*(tau + 1.0) + ratio*rat 371 (1.0 + 2.0*ratio*(tau + 1.0) + ratio*ratio);
>> 372 //tmax = std::min(tmax, targetZ*targetZ*10*eV);
399 cosTetMaxElec = 1.0 - std::min(cutEnergy, 373 cosTetMaxElec = 1.0 - std::min(cutEnergy, tmax)*electron_mass_c2/mom2;
400 } else { 374 } else {
401 375
402 G4double tmax = (particle == theElectron) << 376 G4double tmax = tkin;
>> 377 if(particle == theElectron) { tmax *= 0.5; }
>> 378 //tmax = std::min(tmax, targetZ*targetZ*10*eV);
403 G4double t = std::min(cutEnergy, tmax); 379 G4double t = std::min(cutEnergy, tmax);
404 G4double mom21 = t*(t + 2.0*electron_mass_ 380 G4double mom21 = t*(t + 2.0*electron_mass_c2);
405 G4double t1 = tkin - t; 381 G4double t1 = tkin - t;
406 //G4cout <<"tkin=" <<tkin<<" tmax= "<<tmax 382 //G4cout <<"tkin=" <<tkin<<" tmax= "<<tmax<<" t= "
407 //<<t<< " t1= "<<t1<<" cut= "<<ecut<<G4end 383 //<<t<< " t1= "<<t1<<" cut= "<<ecut<<G4endl;
408 if(t1 > 0.0) { 384 if(t1 > 0.0) {
409 G4double mom22 = t1*(t1 + 2.0*mass); 385 G4double mom22 = t1*(t1 + 2.0*mass);
410 G4double ctm = (mom2 + mom22 - mom21)*0. 386 G4double ctm = (mom2 + mom22 - mom21)*0.5/sqrt(mom2*mom22);
411 if(ctm < 1.0) { cosTetMaxElec = ctm; } 387 if(ctm < 1.0) { cosTetMaxElec = ctm; }
412 if(particle == theElectron && cosTetMaxE 388 if(particle == theElectron && cosTetMaxElec < 0.0) {
413 cosTetMaxElec = 0.0; 389 cosTetMaxElec = 0.0;
414 } 390 }
415 } 391 }
416 } 392 }
417 } 393 }
418 394
419 //....oooOO0OOooo........oooOO0OOooo........oo 395 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
420 396
421 G4double 397 G4double
422 G4WentzelOKandVIxSection::ComputeSecondTranspo 398 G4WentzelOKandVIxSection::ComputeSecondTransportMoment(G4double /*CosThetaMax*/)
423 { 399 {
424 return 0.0; 400 return 0.0;
425 } 401 }
426 402
427 //....oooOO0OOooo........oooOO0OOooo........oo 403 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
428 404