| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. *
17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. *
24 // ******************************************* 24 // ********************************************************************
25 // 25 //
>> 26 // $Id: G4WentzelOKandVIxSection.cc 105734 2017-08-16 12:58:28Z 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 << 64 #ifdef G4MULTITHREADED
66 { << 65 G4Mutex G4WentzelOKandVIxSection::WentzelOKandVIxSectionMutex = G4MUTEX_INITIALIZER;
67 G4Mutex theWOKVIMutex = G4MUTEX_INITIALIZER; << 66 #endif
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 67
75 using namespace std; 68 using namespace std;
76 69
77 G4WentzelOKandVIxSection::G4WentzelOKandVIxSec 70 G4WentzelOKandVIxSection::G4WentzelOKandVIxSection(G4bool comb) :
78 temp(0.,0.,0.), 71 temp(0.,0.,0.),
79 isCombined(comb) << 72 numlimit(0.1),
>> 73 nwarnings(0),
>> 74 nwarnlimit(50),
>> 75 isCombined(comb),
>> 76 cosThetaMax(-1.0),
>> 77 alpha2(fine_structure_const*fine_structure_const)
80 { 78 {
81 fNistManager = G4NistManager::Instance(); 79 fNistManager = G4NistManager::Instance();
82 fG4pow = G4Pow::GetInstance(); 80 fG4pow = G4Pow::GetInstance();
83 <<
84 theElectron = G4Electron::Electron(); 81 theElectron = G4Electron::Electron();
85 thePositron = G4Positron::Positron(); 82 thePositron = G4Positron::Positron();
86 theProton = G4Proton::Proton(); 83 theProton = G4Proton::Proton();
>> 84 lowEnergyLimit = 1.0*eV;
>> 85 G4double p0 = electron_mass_c2*classic_electr_radius;
>> 86 coeff = twopi*p0*p0;
>> 87 particle = nullptr;
>> 88
>> 89 fNucFormfactor = fExponentialNF;
>> 90
>> 91 currentMaterial = nullptr;
>> 92 factB = factD = formfactA = screenZ = 0.0;
>> 93 cosTetMaxElec = cosTetMaxNuc = invbeta2 = kinFactor = gam0pcmp = pcmp2 = 1.0;
>> 94
>> 95 factB1= 0.5*CLHEP::pi*fine_structure_const;
87 96
88 G4double p0 = CLHEP::electron_mass_c2*CLHEP: << 97 tkin = mom2 = momCM2 = factorA2 = mass = spin = chargeSquare = charge3 = 0.0;
89 coeff = CLHEP::twopi*p0*p0; << 98 ecut = etag = DBL_MAX;
>> 99 targetZ = 0;
90 targetMass = CLHEP::proton_mass_c2; 100 targetMass = CLHEP::proton_mass_c2;
91 } 101 }
92 102
93 //....oooOO0OOooo........oooOO0OOooo........oo 103 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
94 104
95 G4WentzelOKandVIxSection::~G4WentzelOKandVIxSe 105 G4WentzelOKandVIxSection::~G4WentzelOKandVIxSection()
96 { << 106 {}
97 delete fMottXSection; <<
98 } <<
99 107
100 //....oooOO0OOooo........oooOO0OOooo........oo 108 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
101 109
102 void G4WentzelOKandVIxSection::Initialise(cons 110 void G4WentzelOKandVIxSection::Initialise(const G4ParticleDefinition* p,
103 G4do 111 G4double cosThetaLim)
104 { 112 {
105 SetupParticle(p); 113 SetupParticle(p);
106 tkin = mom2 = momCM2 = 0.0; 114 tkin = mom2 = momCM2 = 0.0;
107 ecut = etag = DBL_MAX; 115 ecut = etag = DBL_MAX;
108 targetZ = 0; 116 targetZ = 0;
109 117
110 // cosThetaMax is below 1.0 only when MSC is 118 // cosThetaMax is below 1.0 only when MSC is combined with SS
111 if(isCombined) { cosThetaMax = cosThetaLim; 119 if(isCombined) { cosThetaMax = cosThetaLim; }
112 G4EmParameters* param = G4EmParameters::Inst << 120
113 G4double a = param->FactorForAngleLimit()*CL << 121 G4double a = G4EmParameters::Instance()->FactorForAngleLimit()
>> 122 *CLHEP::hbarc/CLHEP::fermi;
114 factorA2 = 0.5*a*a; 123 factorA2 = 0.5*a*a;
115 currentMaterial = nullptr; 124 currentMaterial = nullptr;
116 125
117 fNucFormfactor = param->NuclearFormfactorTyp << 126 fNucFormfactor = G4EmParameters::Instance()->NuclearFormfactorType();
118 if(0.0 == ScreenRSquare[0]) { InitialiseA(); 127 if(0.0 == ScreenRSquare[0]) { InitialiseA(); }
119 <<
120 // Mott corrections always added <<
121 if((p == theElectron || p == thePositron) && <<
122 fMottXSection = new G4ScreeningMottCrossSe <<
123 fMottXSection->Initialise(p, 1.0); <<
124 } <<
125 /* <<
126 G4cout << "G4WentzelOKandVIxSection::Initial <<
127 << p->GetParticleName() << " cosThetaMax= " <<
128 << " " << ScreenRSquare[0] << " coeff= " < <<
129 */ <<
130 } 128 }
131 129
132 //....oooOO0OOooo........oooOO0OOooo........oo 130 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
133 131
134 void G4WentzelOKandVIxSection::InitialiseA() 132 void G4WentzelOKandVIxSection::InitialiseA()
135 { 133 {
136 // Thomas-Fermi screening radii 134 // Thomas-Fermi screening radii
137 // Formfactors from A.V. Butkevich et al., N 135 // Formfactors from A.V. Butkevich et al., NIM A 488 (2002) 282
138 if(0.0 != ScreenRSquare[0]) { return; } << 136 #ifdef G4MULTITHREADED
139 G4AutoLock l(&theWOKVIMutex); << 137 G4MUTEXLOCK(&G4WentzelOKandVIxSection::WentzelOKandVIxSectionMutex);
>> 138 #endif
140 if(0.0 == ScreenRSquare[0]) { 139 if(0.0 == ScreenRSquare[0]) {
141 const G4double invmev2 = 1./(CLHEP::MeV*CL << 140 G4double a0 = electron_mass_c2/0.88534;
142 G4double a0 = CLHEP::electron_mass_c2/0.88 << 141 G4double constn = 6.937e-6/(MeV*MeV);
143 G4double constn = 6.937e-6*invmev2; <<
144 G4double fct = G4EmParameters::Instance()- 142 G4double fct = G4EmParameters::Instance()->ScreeningFactor();
145 143
146 G4double afact = 0.5*fct*alpha2*a0*a0; << 144 G4double afact = fct*0.5*alpha2*a0*a0;
147 ScreenRSquare[0] = afact; 145 ScreenRSquare[0] = afact;
148 ScreenRSquare[1] = afact; 146 ScreenRSquare[1] = afact;
149 ScreenRSquareElec[1] = afact; 147 ScreenRSquareElec[1] = afact;
150 FormFactor[1] = 3.097e-6*invmev2; << 148 FormFactor[1] = constn;
151 149
152 for(G4int j=2; j<100; ++j) { 150 for(G4int j=2; j<100; ++j) {
153 G4double x = fG4pow->Z13(j); 151 G4double x = fG4pow->Z13(j);
154 ScreenRSquare[j] = afact*(1 + G4Exp(-j*j 152 ScreenRSquare[j] = afact*(1 + G4Exp(-j*j*0.001))*x*x;
155 ScreenRSquareElec[j] = afact*x*x; 153 ScreenRSquareElec[j] = afact*x*x;
156 x = fNistManager->GetA27(j); 154 x = fNistManager->GetA27(j);
157 FormFactor[j] = constn*x*x; 155 FormFactor[j] = constn*x*x;
158 } 156 }
159 } << 157 }
160 l.unlock(); << 158 #ifdef G4MULTITHREADED
>> 159 G4MUTEXUNLOCK(&G4WentzelOKandVIxSection::WentzelOKandVIxSectionMutex);
>> 160 #endif
>> 161
>> 162 //G4cout << "G4WentzelOKandVIxSection::Initialise mass= " << mass
>> 163 // << " " << p->GetParticleName()
>> 164 // << " cosThetaMax= " << cosThetaMax << G4endl;
>> 165
161 } 166 }
162 167
163 //....oooOO0OOooo........oooOO0OOooo........oo 168 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
164 169
165 void G4WentzelOKandVIxSection::SetupParticle(c 170 void G4WentzelOKandVIxSection::SetupParticle(const G4ParticleDefinition* p)
166 { 171 {
>> 172 /*
>> 173 G4cout << "G4WentzelOKandVIxSection::SetupParticle " << p
>> 174 << " " << particle << " " << this << G4endl;
>> 175 G4cout << this << " " << p->GetParticleName() << G4endl;
>> 176 */
167 particle = p; 177 particle = p;
168 mass = particle->GetPDGMass(); 178 mass = particle->GetPDGMass();
169 spin = particle->GetPDGSpin(); 179 spin = particle->GetPDGSpin();
170 if(0.0 != spin) { spin = 0.5; } 180 if(0.0 != spin) { spin = 0.5; }
171 G4double q = std::abs(particle->GetPDGCharge 181 G4double q = std::abs(particle->GetPDGCharge()/eplus);
172 chargeSquare = q*q; 182 chargeSquare = q*q;
173 charge3 = chargeSquare*q; 183 charge3 = chargeSquare*q;
174 tkin = 0.0; 184 tkin = 0.0;
175 currentMaterial = nullptr; 185 currentMaterial = nullptr;
176 targetZ = 0; 186 targetZ = 0;
177 } 187 }
178 188
179 //....oooOO0OOooo........oooOO0OOooo........oo 189 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
180 190
181 G4double 191 G4double
182 G4WentzelOKandVIxSection::SetupKinematic(G4dou 192 G4WentzelOKandVIxSection::SetupKinematic(G4double ekin, const G4Material* mat)
183 { 193 {
184 if(ekin != tkin || mat != currentMaterial) { 194 if(ekin != tkin || mat != currentMaterial) {
185 currentMaterial = mat; 195 currentMaterial = mat;
186 tkin = ekin; 196 tkin = ekin;
187 mom2 = tkin*(tkin + 2.0*mass); 197 mom2 = tkin*(tkin + 2.0*mass);
188 invbeta2 = 1.0 + mass*mass/mom2; 198 invbeta2 = 1.0 + mass*mass/mom2;
189 factB = spin/invbeta2; 199 factB = spin/invbeta2;
190 cosTetMaxNuc = isCombined ? 200 cosTetMaxNuc = isCombined ?
191 std::max(cosThetaMax, 1.-factorA2*mat->G 201 std::max(cosThetaMax, 1.-factorA2*mat->GetIonisation()->GetInvA23()/mom2)
192 : cosThetaMax; 202 : cosThetaMax;
193 } 203 }
194 return cosTetMaxNuc; 204 return cosTetMaxNuc;
195 } 205 }
196 206
197 //....oooOO0OOooo........oooOO0OOooo........oo 207 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
198 208
199 G4double 209 G4double
200 G4WentzelOKandVIxSection::SetupTarget(G4int Z, 210 G4WentzelOKandVIxSection::SetupTarget(G4int Z, G4double cut)
201 { 211 {
202 G4double cosTetMaxNuc2 = cosTetMaxNuc; 212 G4double cosTetMaxNuc2 = cosTetMaxNuc;
203 if(Z != targetZ || tkin != etag) { 213 if(Z != targetZ || tkin != etag) {
204 etag = tkin; 214 etag = tkin;
205 targetZ = std::min(Z, 99); 215 targetZ = std::min(Z, 99);
206 G4double massT = (1 == Z) ? CLHEP::proton_ 216 G4double massT = (1 == Z) ? CLHEP::proton_mass_c2 :
207 fNistManager->GetAtomicMassAmu(Z)*CLHEP: 217 fNistManager->GetAtomicMassAmu(Z)*CLHEP::amu_c2;
208 SetTargetMass(massT); 218 SetTargetMass(massT);
209 219
210 kinFactor = coeff*Z*chargeSquare*invbeta2/ 220 kinFactor = coeff*Z*chargeSquare*invbeta2/mom2;
211 if(particle == theElectron && fMottXSectio <<
212 fMottFactor = (1.0 + 2.0e-4*Z*Z); <<
213 } <<
214 221
215 if(1 == Z) { 222 if(1 == Z) {
216 screenZ = ScreenRSquare[targetZ]/mom2; 223 screenZ = ScreenRSquare[targetZ]/mom2;
217 } else if(mass > MeV) { 224 } else if(mass > MeV) {
218 screenZ = std::min(Z*1.13,1.13 +3.76*Z*Z 225 screenZ = std::min(Z*1.13,1.13 +3.76*Z*Z*invbeta2*alpha2*chargeSquare)*
219 ScreenRSquare[targetZ]/mom2; 226 ScreenRSquare[targetZ]/mom2;
220 } else { 227 } else {
221 G4double tau = tkin/mass; 228 G4double tau = tkin/mass;
222 screenZ = std::min(Z*1.13,(1.13 +3.76*Z* 229 screenZ = std::min(Z*1.13,(1.13 +3.76*Z*Z
223 *invbeta2*alpha2*std::sqrt(tau/(tau 230 *invbeta2*alpha2*std::sqrt(tau/(tau + fG4pow->Z23(targetZ)))))*
224 ScreenRSquareElec[targetZ]/mom2; 231 ScreenRSquareElec[targetZ]/mom2;
225 } 232 }
226 if(targetZ == 1 && particle == theProton & 233 if(targetZ == 1 && particle == theProton && cosTetMaxNuc2 < 0.0) {
227 cosTetMaxNuc2 = 0.0; 234 cosTetMaxNuc2 = 0.0;
228 } 235 }
229 formfactA = FormFactor[targetZ]*mom2; 236 formfactA = FormFactor[targetZ]*mom2;
230 237
231 cosTetMaxElec = 1.0; 238 cosTetMaxElec = 1.0;
232 ComputeMaxElectronScattering(cut); 239 ComputeMaxElectronScattering(cut);
233 } 240 }
234 //G4cout << "SetupTarget: Z= " << targetZ < <<
235 // << " fMottFactor= " << fMottFactor << " <<
236 return cosTetMaxNuc2; 241 return cosTetMaxNuc2;
237 } 242 }
238 243
239 //....oooOO0OOooo........oooOO0OOooo........oo 244 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
240 245
241 G4double 246 G4double
242 G4WentzelOKandVIxSection::ComputeTransportCros 247 G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom(G4double cosTMax)
243 { 248 {
244 G4double xSection = 0.0; 249 G4double xSection = 0.0;
245 if(cosTMax >= 1.0) { return xSection; } 250 if(cosTMax >= 1.0) { return xSection; }
246 251
247 G4double costm = std::max(cosTMax,cosTetMaxE 252 G4double costm = std::max(cosTMax,cosTetMaxElec);
248 G4double fb = screenZ*factB; 253 G4double fb = screenZ*factB;
249 254
250 // scattering off electrons 255 // scattering off electrons
251 if(costm < 1.0) { 256 if(costm < 1.0) {
252 G4double x = (1.0 - costm)/screenZ; 257 G4double x = (1.0 - costm)/screenZ;
253 if(x < numlimit) { 258 if(x < numlimit) {
254 G4double x2 = 0.5*x*x; 259 G4double x2 = 0.5*x*x;
255 xSection = x2*((1.0 - 1.3333333*x + 3*x2 260 xSection = x2*((1.0 - 1.3333333*x + 3*x2) - fb*x*(0.6666667 - x));
256 } else { 261 } else {
257 G4double x1= x/(1 + x); 262 G4double x1= x/(1 + x);
258 G4double xlog = G4Log(1.0 + x); 263 G4double xlog = G4Log(1.0 + x);
259 xSection = xlog - x1 - fb*(x + x1 - 2*xl 264 xSection = xlog - x1 - fb*(x + x1 - 2*xlog);
260 } 265 }
261 266
262 if(xSection < 0.0) { 267 if(xSection < 0.0) {
263 ++nwarnings; 268 ++nwarnings;
264 if(nwarnings < nwarnlimit) { 269 if(nwarnings < nwarnlimit) {
265 G4cout << "G4WentzelOKandVIxSection::C 270 G4cout << "G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom"
266 << " scattering on e- <0" 271 << " scattering on e- <0"
267 << G4endl; 272 << G4endl;
268 G4cout << "cross= " << xSection 273 G4cout << "cross= " << xSection
269 << " e(MeV)= " << tkin << " p(M 274 << " e(MeV)= " << tkin << " p(MeV/c)= " << sqrt(mom2)
270 << " Z= " << targetZ << " " 275 << " Z= " << targetZ << " "
271 << particle->GetParticleName() 276 << particle->GetParticleName() << G4endl;
272 G4cout << " 1-costm= " << 1.0-costm << 277 G4cout << " 1-costm= " << 1.0-costm << " screenZ= " << screenZ
273 << " x= " << x << G4endl; 278 << " x= " << x << G4endl;
274 } 279 }
275 xSection = 0.0; 280 xSection = 0.0;
276 } 281 }
277 } 282 }
278 /* 283 /*
279 G4cout << "G4WentzelOKandVIxSection::Com 284 G4cout << "G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom: \n"
280 << " Z= " << targetZ 285 << " Z= " << targetZ
281 << " e(MeV)= " << tkin/MeV << " XSel= " 286 << " e(MeV)= " << tkin/MeV << " XSel= " << xSection
282 << " zmaxE= " << (1.0 - cosTetMaxElec)/s 287 << " zmaxE= " << (1.0 - cosTetMaxElec)/screenZ
283 << " zmaxN= " << (1.0 - cosThetaMax)/scr 288 << " zmaxN= " << (1.0 - cosThetaMax)/screenZ
284 << " 1-costm= " << 1.0 - cosThetaMax << 289 << " 1-costm= " << 1.0 - cosThetaMax << G4endl;
285 */ 290 */
286 // scattering off nucleus 291 // scattering off nucleus
287 if(cosTMax < 1.0) { 292 if(cosTMax < 1.0) {
288 G4double x = (1.0 - cosTMax)/screenZ; 293 G4double x = (1.0 - cosTMax)/screenZ;
289 G4double y; 294 G4double y;
290 if(x < numlimit) { 295 if(x < numlimit) {
291 G4double x2 = 0.5*x*x; 296 G4double x2 = 0.5*x*x;
292 y = x2*((1.0 - 1.3333333*x + 3*x2) - fb* 297 y = x2*((1.0 - 1.3333333*x + 3*x2) - fb*x*(0.6666667 - x));
293 } else { 298 } else {
294 G4double x1= x/(1 + x); 299 G4double x1= x/(1 + x);
295 G4double xlog = G4Log(1.0 + x); 300 G4double xlog = G4Log(1.0 + x);
296 y = xlog - x1 - fb*(x + x1 - 2*xlog); 301 y = xlog - x1 - fb*(x + x1 - 2*xlog);
297 } 302 }
298 303
299 if(y < 0.0) { 304 if(y < 0.0) {
300 ++nwarnings; 305 ++nwarnings;
301 if(nwarnings < nwarnlimit) { 306 if(nwarnings < nwarnlimit) {
302 G4cout << "G4WentzelOKandVIxSection::C 307 G4cout << "G4WentzelOKandVIxSection::ComputeTransportCrossSectionPerAtom"
303 << " scattering on nucleus <0" 308 << " scattering on nucleus <0"
304 << G4endl; 309 << G4endl;
305 G4cout << "y= " << y 310 G4cout << "y= " << y
306 << " e(MeV)= " << tkin << " Z= 311 << " e(MeV)= " << tkin << " Z= " << targetZ << " "
307 << particle->GetParticleName() 312 << particle->GetParticleName() << G4endl;
308 G4cout << " formfactA= " << formfactA 313 G4cout << " formfactA= " << formfactA << " screenZ= " << screenZ
309 << " x= " << x <<G4endl; 314 << " x= " << x <<G4endl;
310 } 315 }
311 y = 0.0; 316 y = 0.0;
312 } 317 }
313 xSection += y*targetZ; 318 xSection += y*targetZ;
314 } 319 }
315 xSection *= kinFactor; 320 xSection *= kinFactor;
316 321
317 /* 322 /*
318 G4cout << "Z= " << targetZ << " XStot= " << 323 G4cout << "Z= " << targetZ << " XStot= " << xSection/barn
319 << " screenZ= " << screenZ << " formF 324 << " screenZ= " << screenZ << " formF= " << formfactA
320 << " for " << particle->GetParticleNa 325 << " for " << particle->GetParticleName()
321 << " m= " << mass << " 1/v= " << sqrt(invbe 326 << " m= " << mass << " 1/v= " << sqrt(invbeta2)
322 << " p= " << sqrt(mom2) 327 << " p= " << sqrt(mom2)
323 << " x= " << x << G4endl; 328 << " x= " << x << G4endl;
324 */ 329 */
325 return xSection; 330 return xSection;
326 } 331 }
327 332
328 //....oooOO0OOooo........oooOO0OOooo........oo 333 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
329 334
330 G4ThreeVector& 335 G4ThreeVector&
331 G4WentzelOKandVIxSection::SampleSingleScatteri 336 G4WentzelOKandVIxSection::SampleSingleScattering(G4double cosTMin,
332 337 G4double cosTMax,
333 338 G4double elecRatio)
334 { 339 {
335 temp.set(0.0,0.0,1.0); 340 temp.set(0.0,0.0,1.0);
336 CLHEP::HepRandomEngine* rndmEngineMod = G4Ra 341 CLHEP::HepRandomEngine* rndmEngineMod = G4Random::getTheEngine();
337 342
338 G4double formf = formfactA; 343 G4double formf = formfactA;
339 G4double cost1 = cosTMin; 344 G4double cost1 = cosTMin;
340 G4double cost2 = cosTMax; 345 G4double cost2 = cosTMax;
341 if(elecRatio > 0.0) { 346 if(elecRatio > 0.0) {
342 if(rndmEngineMod->flat() <= elecRatio) { 347 if(rndmEngineMod->flat() <= elecRatio) {
343 formf = 0.0; 348 formf = 0.0;
344 cost1 = std::max(cost1,cosTetMaxElec); 349 cost1 = std::max(cost1,cosTetMaxElec);
345 cost2 = std::max(cost2,cosTetMaxElec); 350 cost2 = std::max(cost2,cosTetMaxElec);
346 } 351 }
347 } 352 }
348 if(cost1 > cost2) { 353 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; <<
354 354
>> 355 G4double w1 = 1. - cost1 + screenZ;
>> 356 G4double w2 = 1. - cost2 + screenZ;
>> 357 G4double z1 = w1*w2/(w1 + rndmEngineMod->flat()*(w2 - w1)) - screenZ;
>> 358
>> 359 G4double fm = 1.0;
355 if(fNucFormfactor == fExponentialNF) { 360 if(fNucFormfactor == fExponentialNF) {
356 fm += formf*z1; 361 fm += formf*z1;
357 fm = 1.0/(fm*fm); 362 fm = 1.0/(fm*fm);
358 } else if(fNucFormfactor == fGaussianNF) { 363 } else if(fNucFormfactor == fGaussianNF) {
359 fm = G4Exp(-2*formf*z1); 364 fm = G4Exp(-2*formf*z1);
360 } else if(fNucFormfactor == fFlatNF) { 365 } else if(fNucFormfactor == fFlatNF) {
361 static const G4double ccoef = 0.00508/CL << 366 static const G4double ccoef = 0.00508/MeV;
362 G4double x = std::sqrt(2.*mom2*z1)*ccoef 367 G4double x = std::sqrt(2.*mom2*z1)*ccoef*2.;
363 fm = FlatFormfactor(x); 368 fm = FlatFormfactor(x);
364 fm *= FlatFormfactor(x*0.6*fG4pow->A13(f << 369 fm *= FlatFormfactor(x*0.6
>> 370 *fG4pow->A13(fNistManager->GetAtomicMassAmu(targetZ)));
365 } 371 }
366 // G4cout << " fm=" << fm << " " << fMott << 372
367 G4double grej; << 373 G4double grej = (1. - z1*factB + factB1*targetZ*sqrt(z1*factB)*(2. - z1))
368 if(nullptr != fMottXSection) { << 374 *fm*fm/(1.0 + z1*factD);
369 fMottXSection->SetupKinematic(tkin, targ << 375
370 grej = fMottXSection->RatioMottRutherfor << 376 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 377 // exclude "false" scattering due to formfactor and spin effect
377 G4double cost = 1.0 - z1; 378 G4double cost = 1.0 - z1;
378 if(cost > 1.0) { cost = 1.0; } 379 if(cost > 1.0) { cost = 1.0; }
379 else if(cost < -1.0) { cost =-1.0; } 380 else if(cost < -1.0) { cost =-1.0; }
380 G4double sint = sqrt((1.0 - cost)*(1.0 + 381 G4double sint = sqrt((1.0 - cost)*(1.0 + cost));
381 //G4cout << "sint= " << sint << G4endl; 382 //G4cout << "sint= " << sint << G4endl;
382 G4double phi = twopi*rndmEngineMod->fla 383 G4double phi = twopi*rndmEngineMod->flat();
383 temp.set(sint*cos(phi),sint*sin(phi),cos 384 temp.set(sint*cos(phi),sint*sin(phi),cost);
384 } 385 }
385 } 386 }
386 return temp; 387 return temp;
387 } 388 }
388 389
389 //....oooOO0OOooo........oooOO0OOooo........oo 390 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
390 391
391 void 392 void
392 G4WentzelOKandVIxSection::ComputeMaxElectronSc 393 G4WentzelOKandVIxSection::ComputeMaxElectronScattering(G4double cutEnergy)
393 { 394 {
394 if(mass > MeV) { 395 if(mass > MeV) {
395 G4double ratio = electron_mass_c2/mass; 396 G4double ratio = electron_mass_c2/mass;
396 G4double tau = tkin/mass; 397 G4double tau = tkin/mass;
397 G4double tmax = 2.0*electron_mass_c2*tau*( 398 G4double tmax = 2.0*electron_mass_c2*tau*(tau + 2.)/
398 (1.0 + 2.0*ratio*(tau + 1.0) + ratio*rat 399 (1.0 + 2.0*ratio*(tau + 1.0) + ratio*ratio);
399 cosTetMaxElec = 1.0 - std::min(cutEnergy, 400 cosTetMaxElec = 1.0 - std::min(cutEnergy, tmax)*electron_mass_c2/mom2;
400 } else { 401 } else {
401 402
402 G4double tmax = (particle == theElectron) 403 G4double tmax = (particle == theElectron) ? 0.5*tkin : tkin;
403 G4double t = std::min(cutEnergy, tmax); 404 G4double t = std::min(cutEnergy, tmax);
404 G4double mom21 = t*(t + 2.0*electron_mass_ 405 G4double mom21 = t*(t + 2.0*electron_mass_c2);
405 G4double t1 = tkin - t; 406 G4double t1 = tkin - t;
406 //G4cout <<"tkin=" <<tkin<<" tmax= "<<tmax 407 //G4cout <<"tkin=" <<tkin<<" tmax= "<<tmax<<" t= "
407 //<<t<< " t1= "<<t1<<" cut= "<<ecut<<G4end 408 //<<t<< " t1= "<<t1<<" cut= "<<ecut<<G4endl;
408 if(t1 > 0.0) { 409 if(t1 > 0.0) {
409 G4double mom22 = t1*(t1 + 2.0*mass); 410 G4double mom22 = t1*(t1 + 2.0*mass);
410 G4double ctm = (mom2 + mom22 - mom21)*0. 411 G4double ctm = (mom2 + mom22 - mom21)*0.5/sqrt(mom2*mom22);
411 if(ctm < 1.0) { cosTetMaxElec = ctm; } 412 if(ctm < 1.0) { cosTetMaxElec = ctm; }
412 if(particle == theElectron && cosTetMaxE 413 if(particle == theElectron && cosTetMaxElec < 0.0) {
413 cosTetMaxElec = 0.0; 414 cosTetMaxElec = 0.0;
414 } 415 }
415 } 416 }
416 } 417 }
417 } 418 }
418 419
419 //....oooOO0OOooo........oooOO0OOooo........oo 420 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
420 421
421 G4double 422 G4double
422 G4WentzelOKandVIxSection::ComputeSecondTranspo 423 G4WentzelOKandVIxSection::ComputeSecondTransportMoment(G4double /*CosThetaMax*/)
423 { 424 {
424 return 0.0; 425 return 0.0;
425 } 426 }
426 427
427 //....oooOO0OOooo........oooOO0OOooo........oo 428 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
428 429