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>> 26 // $Id: G4eCoulombScatteringModel.cc,v 1.59 2008/10/22 18:39:29 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-02-patch-04 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class file 31 // GEANT4 Class file
30 // 32 //
31 // 33 //
32 // File name: G4eCoulombScatteringModel 34 // File name: G4eCoulombScatteringModel
33 // 35 //
34 // Author: Vladimir Ivanchenko 36 // Author: Vladimir Ivanchenko
35 // 37 //
36 // Creation date: 22.08.2005 38 // Creation date: 22.08.2005
37 // 39 //
38 // Modifications: V.Ivanchenko << 40 // Modifications:
39 // << 41 // 01.08.06 V.Ivanchenko extend upper limit of table to TeV and review the
40 // << 42 // logic of building - only elements from G4ElementTable
>> 43 // 08.08.06 V.Ivanchenko build internal table in ekin scale, introduce faclim
>> 44 // 19.08.06 V.Ivanchenko add inline function ScreeningParameter
>> 45 // 09.10.07 V.Ivanchenko reorganized methods, add cut dependence in scattering off e-
>> 46 // 09.06.08 V.Ivanchenko add SelectIsotope and sampling of the recoil ion
41 // 47 //
42 // Class Description: 48 // Class Description:
43 // 49 //
44 // ------------------------------------------- 50 // -------------------------------------------------------------------
45 // 51 //
46 //....oooOO0OOooo........oooOO0OOooo........oo 52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47 //....oooOO0OOooo........oooOO0OOooo........oo 53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
48 54
49 #include "G4eCoulombScatteringModel.hh" 55 #include "G4eCoulombScatteringModel.hh"
50 #include "G4PhysicalConstants.hh" <<
51 #include "G4SystemOfUnits.hh" <<
52 #include "Randomize.hh" 56 #include "Randomize.hh"
53 #include "G4DataVector.hh" 57 #include "G4DataVector.hh"
54 #include "G4ElementTable.hh" 58 #include "G4ElementTable.hh"
>> 59 #include "G4PhysicsLogVector.hh"
55 #include "G4ParticleChangeForGamma.hh" 60 #include "G4ParticleChangeForGamma.hh"
>> 61 #include "G4Electron.hh"
>> 62 #include "G4Positron.hh"
56 #include "G4Proton.hh" 63 #include "G4Proton.hh"
57 #include "G4ParticleTable.hh" 64 #include "G4ParticleTable.hh"
58 #include "G4IonTable.hh" <<
59 #include "G4ProductionCutsTable.hh" <<
60 #include "G4NucleiProperties.hh" <<
61 #include "G4Pow.hh" <<
62 #include "G4NistManager.hh" <<
63 65
64 //....oooOO0OOooo........oooOO0OOooo........oo 66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
65 67
66 using namespace std; 68 using namespace std;
67 69
68 G4eCoulombScatteringModel::G4eCoulombScatterin << 70 G4eCoulombScatteringModel::G4eCoulombScatteringModel(const G4String& nam)
69 : G4VEmModel("eCoulombScattering"), isCombin << 71 : G4VEmModel(nam),
>> 72 cosThetaMin(1.0),
>> 73 cosThetaMax(-1.0),
>> 74 q2Limit(TeV*TeV),
>> 75 alpha2(fine_structure_const*fine_structure_const),
>> 76 faclim(100.0),
>> 77 isInitialised(false)
70 { 78 {
71 fNistManager = G4NistManager::Instance(); 79 fNistManager = G4NistManager::Instance();
72 theIonTable = G4ParticleTable::GetParticleT << 80 theParticleTable = G4ParticleTable::GetParticleTable();
73 theProton = G4Proton::Proton(); << 81 theElectron = G4Electron::Electron();
74 << 82 thePositron = G4Positron::Positron();
75 wokvi = new G4WentzelOKandVIxSection(isCombi << 83 theProton = G4Proton::Proton();
76 << 84 currentMaterial = 0;
77 mass = CLHEP::proton_mass_c2; << 85 currentElement = 0;
>> 86 a0 = alpha2*electron_mass_c2*electron_mass_c2/(0.885*0.885);
>> 87 G4double p0 = electron_mass_c2*classic_electr_radius;
>> 88 coeff = twopi*p0*p0;
>> 89 constn = 6.937e-6/(MeV*MeV);
>> 90 tkin = targetZ = mom2 = DBL_MIN;
>> 91 elecXSection = nucXSection = 0.0;
>> 92 recoilThreshold = DBL_MAX;
>> 93 ecut = DBL_MAX;
>> 94 particle = 0;
>> 95 currentCouple = 0;
>> 96 for(size_t j=0; j<100; j++) {
>> 97 FF[j] = 0.0;
>> 98 }
78 } 99 }
79 100
80 //....oooOO0OOooo........oooOO0OOooo........oo 101 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
81 102
82 G4eCoulombScatteringModel::~G4eCoulombScatteri 103 G4eCoulombScatteringModel::~G4eCoulombScatteringModel()
83 { << 104 {}
84 delete wokvi; <<
85 } <<
86 105
87 //....oooOO0OOooo........oooOO0OOooo........oo 106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
88 107
89 void G4eCoulombScatteringModel::Initialise(con << 108 void G4eCoulombScatteringModel::Initialise(const G4ParticleDefinition* p,
90 const G4DataVector& cuts) 109 const G4DataVector& cuts)
91 { 110 {
92 SetupParticle(part); << 111 SetupParticle(p);
93 currentCouple = nullptr; << 112 currentCouple = 0;
94 << 113 elecXSection = nucXSection = 0.0;
95 G4double tet = PolarAngleLimit(); << 114 tkin = targetZ = mom2 = DBL_MIN;
96 << 115 ecut = etag = DBL_MAX;
97 // defined theta limit between single and mu << 116 cosThetaMin = cos(PolarAngleLimit());
98 if(isCombined) { << 117 currentCuts = &cuts;
99 if(tet >= CLHEP::pi) { cosThetaMin = -1.0; << 118 //G4cout << "!!! G4eCoulombScatteringModel::Initialise for "
100 else if(tet > 0.0) { cosThetaMin = std::co << 119 // << p->GetParticleName() << " cos(TetMin)= " << cosThetaMin
101 << 120 // << " cos(TetMax)= " << cosThetaMax <<G4endl;
102 // single scattering without multiple << 121 if(!isInitialised) {
103 } else if(tet > 0.0) { << 122 isInitialised = true;
104 cosThetaMin = std::cos(std::min(tet, CLHEP << 123
105 } << 124 if(pParticleChange)
106 << 125 fParticleChange =
107 wokvi->Initialise(part, cosThetaMin); << 126 reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
108 pCuts = &cuts; << 127 else
109 /* << 128 fParticleChange = new G4ParticleChangeForGamma();
110 G4cout << "G4eCoulombScatteringModel::Initia <<
111 << part->GetParticleName() << " 1-cos(Tet <<
112 << " 1-cos(TetMax)= " << 1. - cosThetaMax <<
113 G4cout << "cut[0]= " << (*pCuts)[0] << G4end <<
114 */ <<
115 if(nullptr == fParticleChange) { <<
116 fParticleChange = GetParticleChangeForGamm <<
117 } 129 }
118 if(IsMaster() && mass < GeV && part->GetPart << 130 if(mass < GeV && particle->GetParticleType() != "nucleus") {
119 InitialiseElementSelectors(part, cuts); << 131 InitialiseElementSelectors(p,cuts);
120 } 132 }
121 } 133 }
122 134
123 //....oooOO0OOooo........oooOO0OOooo........oo 135 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
124 136
125 void G4eCoulombScatteringModel::InitialiseLoca << 137 void G4eCoulombScatteringModel::ComputeMaxElectronScattering(G4double cutEnergy)
126 G4VEmModel* masterModel) <<
127 { 138 {
128 SetElementSelectors(masterModel->GetElementS << 139 ecut = cutEnergy;
129 } << 140 G4double tmax = tkin;
130 << 141 cosTetMaxElec = 1.0;
131 //....oooOO0OOooo........oooOO0OOooo........oo << 142 if(mass > MeV) {
132 << 143 G4double ratio = electron_mass_c2/mass;
133 G4double << 144 G4double tau = tkin/mass;
134 G4eCoulombScatteringModel::MinPrimaryEnergy(co << 145 tmax = 2.0*electron_mass_c2*tau*(tau + 2.)/
135 const G4ParticleDefinition* part << 146 (1.0 + 2.0*ratio*(tau + 1.0) + ratio*ratio);
136 G4double) << 147 cosTetMaxElec = 1.0 - std::min(cutEnergy, tmax)*electron_mass_c2/mom2;
137 { << 148 } else {
138 SetupParticle(part); <<
139 149
140 // define cut using cuts for proton << 150 if(particle == theElectron) tmax *= 0.5;
141 G4double cut = << 151 G4double t = std::min(cutEnergy, tmax);
142 std::max(recoilThreshold, (*pCuts)[Current << 152 G4double mom21 = t*(t + 2.0*electron_mass_c2);
143 << 153 G4double t1 = tkin - t;
144 // find out lightest element << 154 //G4cout << "tkin= " << tkin << " t= " << t << " t1= " << t1 << G4endl;
145 const G4ElementVector* theElementVector = ma << 155 if(t1 > 0.0) {
146 std::size_t nelm = material->GetNumberOfElem << 156 G4double mom22 = t1*(t1 + 2.0*mass);
147 << 157 G4double ctm = (mom2 + mom22 - mom21)*0.5/sqrt(mom2*mom22);
148 // select lightest element << 158 //G4cout << "ctm= " << ctm << G4endl;
149 G4int Z = 300; << 159 if(ctm < 1.0) cosTetMaxElec = ctm;
150 for (std::size_t j=0; j<nelm; ++j) { << 160 }
151 Z = std::min(Z,(*theElementVector)[j]->Get <<
152 } 161 }
153 G4int A = G4lrint(fNistManager->GetAtomicMas <<
154 G4double targetMass = G4NucleiProperties::Ge <<
155 G4double t = std::max(cut, 0.5*(cut + sqrt(2 <<
156 <<
157 return t; <<
158 } 162 }
159 163
160 //....oooOO0OOooo........oooOO0OOooo........oo 164 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
161 165
162 G4double G4eCoulombScatteringModel::ComputeCro 166 G4double G4eCoulombScatteringModel::ComputeCrossSectionPerAtom(
163 const G4ParticleDefinition* p, 167 const G4ParticleDefinition* p,
164 G4double kinEnergy, 168 G4double kinEnergy,
165 G4double Z, G4double, 169 G4double Z, G4double,
166 G4double cutEnergy, G4double) 170 G4double cutEnergy, G4double)
167 { 171 {
168 /* << 172 //G4cout << "### G4eCoulombScatteringModel::ComputeCrossSectionPerAtom for "
169 G4cout << "### G4eCoulombScatteringModel::Co << 173 // << p->GetParticleName()<<" Z= "<<Z<<" e(MeV)= "<< kinEnergy/MeV << G4endl;
170 << p->GetParticleName()<<" Z= "<<Z<<" e(MeV << 174 G4double xsec = 0.0;
171 << G4endl; << 175 SetupParticle(p);
>> 176 G4double ekin = std::max(lowEnergyLimit, kinEnergy);
>> 177 SetupKinematic(ekin, cutEnergy);
>> 178 if(cosTetMaxNuc < cosTetMinNuc) {
>> 179 SetupTarget(Z, ekin);
>> 180 xsec = CrossSectionPerAtom();
>> 181 }
>> 182 /*
>> 183 G4cout << "e(MeV)= " << ekin/MeV << "cosTetMinNuc= " << cosTetMinNuc
>> 184 << " cosTetMaxNuc= " << cosTetMaxNuc
>> 185 << " cosTetMaxElec= " << cosTetMaxElec
>> 186 << " screenZ= " << screenZ
>> 187 << " formfactA= " << formfactA
>> 188 << " cosTetMaxHad= " << cosTetMaxHad << G4endl;
172 */ 189 */
173 G4double cross = 0.0; << 190 return xsec;
174 elecRatio = 0.0; << 191 }
175 if(p != particle) { SetupParticle(p); } << 192
176 << 193 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
177 // cross section is set to zero to avoid pro << 194
178 if(kinEnergy <= 0.0) { return cross; } << 195 G4double G4eCoulombScatteringModel::CrossSectionPerAtom()
179 DefineMaterial(CurrentCouple()); << 196 {
180 G4double costmin = wokvi->SetupKinematic(kin << 197 // This method needs initialisation before be called
181 << 198
182 //G4cout << "cosThetaMax= "<<cosThetaMax<<" << 199 G4double fac = coeff*targetZ*chargeSquare*invbeta2/mom2;
183 << 200 elecXSection = 0.0;
184 if(cosThetaMax < costmin) { << 201 nucXSection = 0.0;
185 G4int iz = G4lrint(Z); << 202
186 G4double cut = (0.0 < fixedCut) ? fixedCut << 203 G4double x = 1.0 - cosTetMinNuc;
187 costmin = wokvi->SetupTarget(iz, cut); << 204 G4double x1 = x + screenZ;
188 //G4cout << "SetupTarget: Z= " << iz << " << 205
189 // << costmin << G4endl; << 206 if(cosTetMaxElec2 < cosTetMinNuc) {
190 G4double costmax = (1 == iz && particle == << 207 elecXSection = fac*(cosTetMinNuc - cosTetMaxElec2)/
191 ? 0.0 : cosThetaMax; << 208 (x1*(1.0 - cosTetMaxElec2 + screenZ));
192 if(costmin > costmax) { << 209 nucXSection = elecXSection;
193 cross = wokvi->ComputeNuclearCrossSectio << 210 }
194 + wokvi->ComputeElectronCrossSection(c << 211
>> 212 //G4cout << "XS tkin(MeV)= " << tkin<<" xs= " <<nucXSection
>> 213 // << " costmax= " << cosTetMaxNuc2
>> 214 // << " costmin= " << cosTetMinNuc << " Z= " << targetZ <<G4endl;
>> 215 if(cosTetMaxNuc2 < cosTetMinNuc) {
>> 216 G4double s = screenZ*formfactA;
>> 217 G4double z1 = 1.0 - cosTetMaxNuc2 + screenZ;
>> 218 G4double d = (1.0 - s)/formfactA;
>> 219 //G4cout <<"x1= "<<x1<<" z1= " <<z1<<" s= "<<s << " d= " <<d <<G4endl;
>> 220 if(d < 0.2*x1) {
>> 221 G4double x2 = x1*x1;
>> 222 G4double z2 = z1*z1;
>> 223 x = (1.0/(x1*x2) - 1.0/(z1*z2) - d*1.5*(1.0/(x2*x2) - 1.0/(z2*z2)))/
>> 224 (3.0*formfactA*formfactA);
>> 225 } else {
>> 226 G4double x2 = x1 + d;
>> 227 G4double z2 = z1 + d;
>> 228 x = (1.0 + 2.0*s)*((cosTetMinNuc - cosTetMaxNuc2)*(1.0/(x1*z1) + 1.0/(x2*z2)) -
>> 229 2.0*log(z1*x2/(z2*x1))/d);
195 } 230 }
196 /* << 231 nucXSection += fac*targetZ*x;
197 if(p->GetParticleName() == "e-") <<
198 G4cout << "Z= " << Z << " e(MeV)= " << kin <<
199 << " cross(b)= " << cross/barn << " 1-cos <<
200 << " 1-costmax= " << 1-costmax <<
201 << " 1-cosThetaMax= " << 1-cosThetaMax <<
202 << " " << currentMaterial->GetName() <<
203 << G4endl; <<
204 */ <<
205 } 232 }
206 //G4cout << "====== cross= " << cross << G4e << 233
207 return cross; << 234 //G4cout<<" cross(bn)= "<<nucXSection/barn<<" xsElec(bn)= "<<elecXSection/barn
>> 235 // << " Asc= " << screenZ << G4endl;
>> 236
>> 237 return nucXSection;
208 } 238 }
209 239
210 //....oooOO0OOooo........oooOO0OOooo........oo 240 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
211 241
212 void G4eCoulombScatteringModel::SampleSecondar 242 void G4eCoulombScatteringModel::SampleSecondaries(
213 std::vector<G4DynamicParticle* 243 std::vector<G4DynamicParticle*>* fvect,
214 const G4MaterialCutsCouple* couple, 244 const G4MaterialCutsCouple* couple,
215 const G4DynamicParticle* dp, 245 const G4DynamicParticle* dp,
216 G4double cutEnergy, 246 G4double cutEnergy,
217 G4double) 247 G4double)
218 { 248 {
219 G4double kinEnergy = dp->GetKineticEnergy(); 249 G4double kinEnergy = dp->GetKineticEnergy();
220 SetupParticle(dp->GetDefinition()); << 250 if(kinEnergy <= DBL_MIN) return;
221 DefineMaterial(couple); 251 DefineMaterial(couple);
222 /* << 252 SetupParticle(dp->GetDefinition());
223 G4cout << "G4eCoulombScatteringModel::Sample << 253 G4double ekin = std::max(lowEnergyLimit, kinEnergy);
224 << kinEnergy << " " << particle->GetPart << 254 SetupKinematic(ekin, cutEnergy);
225 << " cut= " << cutEnergy<< G4endl; << 255 //G4cout << "G4eCoulombScatteringModel::SampleSecondaries e(MeV)= "
226 */ << 256 // << kinEnergy << " " << particle->GetParticleName() << G4endl;
>> 257
227 // Choose nucleus 258 // Choose nucleus
228 G4double cut = (0.0 < fixedCut) ? fixedCut : << 259 currentElement = SelectRandomAtom(couple,particle,ekin,cutEnergy,ekin);
229 260
230 wokvi->SetupKinematic(kinEnergy, currentMate << 261 SetupTarget(currentElement->GetZ(),ekin);
>> 262
>> 263 G4double cost = SampleCosineTheta();
>> 264 G4double z1 = 1.0 - cost;
>> 265 if(z1 < 0.0) return;
>> 266
>> 267 G4double sint = sqrt(z1*(1.0 + cost));
>> 268
>> 269 //G4cout<<"## Sampled sint= " << sint << " Z= " << targetZ
>> 270 // << " screenZ= " << screenZ << " cn= " << formfactA << G4endl;
>> 271
>> 272 G4double phi = twopi * G4UniformRand();
231 273
232 const G4Element* currentElement = SelectTarg <<
233 dp->Get <<
234 G4int iz = currentElement->GetZasInt(); <<
235 <<
236 G4double costmin = wokvi->SetupTarget(iz, cu <<
237 G4double costmax = (1 == iz && particle == t <<
238 ? 0.0 : cosThetaMax; <<
239 if(costmin <= costmax) { return; } <<
240 <<
241 G4double cross = wokvi->ComputeNuclearCrossS <<
242 G4double ecross = wokvi->ComputeElectronCros <<
243 G4double ratio = ecross/(cross + ecross); <<
244 <<
245 G4int ia = SelectIsotopeNumber(currentElemen <<
246 G4double targetMass = G4NucleiProperties::Ge <<
247 wokvi->SetTargetMass(targetMass); <<
248 <<
249 G4ThreeVector newDirection = <<
250 wokvi->SampleSingleScattering(costmin, cos <<
251 G4double cost = newDirection.z(); <<
252 /* <<
253 G4cout << "SampleSec: e(MeV)= " << kinEn <<
254 << " 1-costmin= " << 1-costmin <<
255 << " 1-costmax= " << 1-costmax <<
256 << " 1-cost= " << 1-cost <<
257 << " ratio= " << ratio <<
258 << G4endl; <<
259 */ <<
260 G4ThreeVector direction = dp->GetMomentumDir 274 G4ThreeVector direction = dp->GetMomentumDirection();
>> 275 G4ThreeVector newDirection(cos(phi)*sint,sin(phi)*sint,cost);
261 newDirection.rotateUz(direction); 276 newDirection.rotateUz(direction);
262 277
263 fParticleChange->ProposeMomentumDirection(ne 278 fParticleChange->ProposeMomentumDirection(newDirection);
264 279
265 // recoil sampling assuming a small recoil 280 // recoil sampling assuming a small recoil
266 // and first order correction to primary 4-m 281 // and first order correction to primary 4-momentum
267 G4double mom2 = wokvi->GetMomentumSquare(); << 282 if(lowEnergyLimit < kinEnergy) {
268 G4double trec = mom2*(1.0 - cost) << 283 G4int ia = SelectIsotopeNumber(currentElement);
269 /(targetMass + (mass + kinEnergy)*(1.0 - c << 284 G4double Trec = z1*mom2/(amu_c2*G4double(ia));
270 << 285 G4double th =
271 // the check likely not needed << 286 std::min(recoilThreshold,
272 trec = std::min(trec, kinEnergy); << 287 targetZ*currentElement->GetIonisation()->GetMeanExcitationEnergy());
273 G4double finalT = kinEnergy - trec; << 288
274 G4double edep = 0.0; << 289 if(Trec > th) {
275 /* << 290 G4int iz = G4int(targetZ);
276 G4cout<<"G4eCoulombScatteringModel: finalT << 291 G4ParticleDefinition* ion = theParticleTable->FindIon(iz, ia, 0, iz);
277 <<trec << " Z= " << iz << " A= " << ia << 292 Trec = z1*mom2/ion->GetPDGMass();
278 << " tcut(keV)= " << (*pCuts)[currentMater << 293 if(Trec < kinEnergy) {
279 */ << 294 G4ThreeVector dir = (direction - newDirection).unit();
280 G4double tcut = recoilThreshold; << 295 G4DynamicParticle* newdp = new G4DynamicParticle(ion, dir, Trec);
281 if(pCuts) { tcut= std::max(tcut,(*pCuts)[cur << 296 fvect->push_back(newdp);
282 << 297 fParticleChange->SetProposedKineticEnergy(kinEnergy - Trec);
283 if(trec > tcut) { << 298 }
284 G4ParticleDefinition* ion = theIonTable->G << 299 }
285 G4ThreeVector dir = (direction*sqrt(mom2) << 300 }
286 newDirection*sqrt(finalT*(2*mass + fina << 301
287 auto newdp = new G4DynamicParticle(ion, di << 302 return;
288 fvect->push_back(newdp); << 303 }
289 } else { << 304
290 edep = trec; << 305 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
291 fParticleChange->ProposeNonIonizingEnergyD << 306
>> 307 G4double G4eCoulombScatteringModel::SampleCosineTheta()
>> 308 {
>> 309 G4double costm = cosTetMaxNuc2;
>> 310 G4double formf = formfactA;
>> 311 G4double prob = 0.0;
>> 312 G4double xs = CrossSectionPerAtom();
>> 313 if(xs > 0.0) prob = elecXSection/xs;
>> 314
>> 315 // scattering off e or A?
>> 316 if(G4UniformRand() < prob) {
>> 317 costm = cosTetMaxElec2;
>> 318 formf = 0.0;
292 } 319 }
293 320
294 // finelize primary energy and energy bala << 321 /*
295 // this threshold may be applied only beca << 322 G4cout << "SampleCost: e(MeV)= " << tkin
296 // e+e- msc model is applied << 323 << " ctmin= " << cosThetaMin
297 if(finalT < 0.0) { << 324 << " ctmaxN= " << cosTetMaxNuc
298 edep += finalT; << 325 << " ctmax= " << costm
299 finalT = 0.0; << 326 << " Z= " << targetZ << " A= " << targetA
300 } << 327 << G4endl;
301 edep = std::max(edep, 0.0); << 328 */
302 fParticleChange->SetProposedKineticEnergy(fi << 329 if(costm >= cosTetMinNuc) return 2.0;
303 fParticleChange->ProposeLocalEnergyDeposit(e << 330
>> 331 G4double x1 = 1. - cosTetMinNuc + screenZ;
>> 332 G4double x2 = 1. - costm + screenZ;
>> 333 G4double x3 = cosTetMinNuc - costm;
>> 334 G4double grej, z1;
>> 335 do {
>> 336 z1 = x1*x2/(x1 + G4UniformRand()*x3) - screenZ;
>> 337 grej = 1.0/(1.0 + formf*z1);
>> 338 } while ( G4UniformRand() > grej*grej );
>> 339
>> 340 //G4cout << "z= " << z1 << " cross= " << nucXSection/barn
>> 341 // << " crossE= " << elecXSection/barn << G4endl;
>> 342
>> 343 return 1.0 - z1;
304 } 344 }
305 345
306 //....oooOO0OOooo........oooOO0OOooo........oo 346 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 347
>> 348
307 349