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25 // 25 //
>> 26 // $Id: G4eCoulombScatteringModel.cc,v 1.78.2.1 2010/04/06 09:14:44 gcosmo Exp $
>> 27 // GEANT4 tag $Name: geant4-09-03-patch-01 $
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 //
>> 42 // 01.08.06 V.Ivanchenko extend upper limit of table to TeV and review the
>> 43 // logic of building - only elements from G4ElementTable
>> 44 // 08.08.06 V.Ivanchenko build internal table in ekin scale, introduce faclim
>> 45 // 19.08.06 V.Ivanchenko add inline function ScreeningParameter
>> 46 // 09.10.07 V.Ivanchenko reorganized methods, add cut dependence in scattering off e-
>> 47 // 09.06.08 V.Ivanchenko add SelectIsotope and sampling of the recoil ion
>> 48 // 16.06.09 C.Consolandi fixed computation of effective mass
40 // 49 //
41 // 50 //
42 // Class Description: 51 // Class Description:
43 // 52 //
44 // ------------------------------------------- 53 // -------------------------------------------------------------------
45 // 54 //
46 //....oooOO0OOooo........oooOO0OOooo........oo 55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47 //....oooOO0OOooo........oooOO0OOooo........oo 56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
48 57
49 #include "G4eCoulombScatteringModel.hh" 58 #include "G4eCoulombScatteringModel.hh"
50 #include "G4PhysicalConstants.hh" <<
51 #include "G4SystemOfUnits.hh" <<
52 #include "Randomize.hh" 59 #include "Randomize.hh"
53 #include "G4DataVector.hh" 60 #include "G4DataVector.hh"
54 #include "G4ElementTable.hh" 61 #include "G4ElementTable.hh"
>> 62 #include "G4PhysicsLogVector.hh"
55 #include "G4ParticleChangeForGamma.hh" 63 #include "G4ParticleChangeForGamma.hh"
>> 64 #include "G4Electron.hh"
>> 65 #include "G4Positron.hh"
56 #include "G4Proton.hh" 66 #include "G4Proton.hh"
57 #include "G4ParticleTable.hh" 67 #include "G4ParticleTable.hh"
58 #include "G4IonTable.hh" <<
59 #include "G4ProductionCutsTable.hh" 68 #include "G4ProductionCutsTable.hh"
60 #include "G4NucleiProperties.hh" 69 #include "G4NucleiProperties.hh"
61 #include "G4Pow.hh" <<
62 #include "G4NistManager.hh" <<
63 70
64 //....oooOO0OOooo........oooOO0OOooo........oo 71 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
65 72
>> 73 G4double G4eCoulombScatteringModel::ScreenRSquare[] = {0.0};
>> 74 G4double G4eCoulombScatteringModel::FormFactor[] = {0.0};
>> 75
66 using namespace std; 76 using namespace std;
67 77
68 G4eCoulombScatteringModel::G4eCoulombScatterin << 78 G4eCoulombScatteringModel::G4eCoulombScatteringModel(const G4String& nam)
69 : G4VEmModel("eCoulombScattering"), isCombin << 79 : G4VEmModel(nam),
>> 80 cosThetaMin(1.0),
>> 81 cosThetaMax(-1.0),
>> 82 q2Limit(TeV*TeV),
>> 83 alpha2(fine_structure_const*fine_structure_const),
>> 84 faclim(100.0),
>> 85 isInitialised(false)
70 { 86 {
71 fNistManager = G4NistManager::Instance(); 87 fNistManager = G4NistManager::Instance();
72 theIonTable = G4ParticleTable::GetParticleT << 88 theParticleTable = G4ParticleTable::GetParticleTable();
73 theProton = G4Proton::Proton(); << 89 theElectron = G4Electron::Electron();
74 << 90 thePositron = G4Positron::Positron();
75 wokvi = new G4WentzelOKandVIxSection(isCombi << 91 theProton = G4Proton::Proton();
76 << 92 currentMaterial = 0;
77 mass = CLHEP::proton_mass_c2; << 93 currentElement = 0;
>> 94 lowEnergyLimit = 100*eV;
>> 95 G4double p0 = electron_mass_c2*classic_electr_radius;
>> 96 coeff = twopi*p0*p0;
>> 97 tkin = targetZ = mom2 = etag = 0.0;
>> 98 elecXSection = nucXSection = 0.0;
>> 99 recoilThreshold = 0.*keV;
>> 100 ecut = DBL_MAX;
>> 101 particle = 0;
>> 102 currentCouple = 0;
>> 103
>> 104 // Thomas-Fermi screening radii
>> 105 // Formfactors from A.V. Butkevich et al., NIM A 488 (2002) 282
>> 106
>> 107 if(0.0 == ScreenRSquare[0]) {
>> 108 G4double a0 = electron_mass_c2/0.88534;
>> 109 G4double constn = 6.937e-6/(MeV*MeV);
>> 110
>> 111 ScreenRSquare[0] = alpha2*a0*a0;
>> 112 for(G4int j=1; j<100; ++j) {
>> 113 G4double x = a0*fNistManager->GetZ13(j);
>> 114 ScreenRSquare[j] = alpha2*x*x;
>> 115 x = fNistManager->GetA27(j);
>> 116 FormFactor[j] = constn*x*x;
>> 117 }
>> 118 }
78 } 119 }
79 120
80 //....oooOO0OOooo........oooOO0OOooo........oo 121 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
81 122
82 G4eCoulombScatteringModel::~G4eCoulombScatteri 123 G4eCoulombScatteringModel::~G4eCoulombScatteringModel()
83 { << 124 {}
84 delete wokvi; <<
85 } <<
86 125
87 //....oooOO0OOooo........oooOO0OOooo........oo 126 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
88 127
89 void G4eCoulombScatteringModel::Initialise(con << 128 void G4eCoulombScatteringModel::Initialise(const G4ParticleDefinition* p,
90 const G4DataVector& cuts) 129 const G4DataVector& cuts)
91 { 130 {
92 SetupParticle(part); << 131 SetupParticle(p);
93 currentCouple = nullptr; << 132 currentCouple = 0;
94 << 133 elecXSection = nucXSection = 0.0;
95 G4double tet = PolarAngleLimit(); << 134 tkin = targetZ = mom2 = DBL_MIN;
96 << 135 ecut = etag = DBL_MAX;
97 // defined theta limit between single and mu << 136 cosThetaMin = cos(PolarAngleLimit());
98 if(isCombined) { << 137 pCuts = G4ProductionCutsTable::GetProductionCutsTable()->GetEnergyCutsVector(3);
99 if(tet >= CLHEP::pi) { cosThetaMin = -1.0; << 138 //G4cout << "!!! G4eCoulombScatteringModel::Initialise for "
100 else if(tet > 0.0) { cosThetaMin = std::co << 139 // << p->GetParticleName() << " cos(TetMin)= " << cosThetaMin
101 << 140 // << " cos(TetMax)= " << cosThetaMax <<G4endl;
102 // single scattering without multiple << 141 // G4cout << "cut0= " << cuts[0] << " cut1= " << cuts[1] << G4endl;
103 } else if(tet > 0.0) { << 142 if(!isInitialised) {
104 cosThetaMin = std::cos(std::min(tet, CLHEP << 143 isInitialised = true;
105 } <<
106 <<
107 wokvi->Initialise(part, cosThetaMin); <<
108 pCuts = &cuts; <<
109 /* <<
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 144 fParticleChange = GetParticleChangeForGamma();
117 } 145 }
118 if(IsMaster() && mass < GeV && part->GetPart << 146 if(mass < GeV && particle->GetParticleType() != "nucleus") {
119 InitialiseElementSelectors(part, cuts); << 147 InitialiseElementSelectors(p,cuts);
120 } 148 }
121 } 149 }
122 150
123 //....oooOO0OOooo........oooOO0OOooo........oo 151 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
124 152
125 void G4eCoulombScatteringModel::InitialiseLoca << 153 void G4eCoulombScatteringModel::ComputeMaxElectronScattering(G4double cutEnergy)
126 G4VEmModel* masterModel) <<
127 { 154 {
128 SetElementSelectors(masterModel->GetElementS << 155 ecut = cutEnergy;
129 } << 156 G4double tmax = tkin;
130 << 157 cosTetMaxElec = 1.0;
131 //....oooOO0OOooo........oooOO0OOooo........oo << 158 if(mass > MeV) {
132 << 159 G4double ratio = electron_mass_c2/mass;
133 G4double << 160 G4double tau = tkin/mass;
134 G4eCoulombScatteringModel::MinPrimaryEnergy(co << 161 tmax = 2.0*electron_mass_c2*tau*(tau + 2.)/
135 const G4ParticleDefinition* part << 162 (1.0 + 2.0*ratio*(tau + 1.0) + ratio*ratio);
136 G4double) << 163 cosTetMaxElec = 1.0 - std::min(cutEnergy, tmax)*electron_mass_c2/mom2;
137 { << 164 } else {
138 SetupParticle(part); <<
139 165
140 // define cut using cuts for proton << 166 if(particle == theElectron) tmax *= 0.5;
141 G4double cut = << 167 G4double t = std::min(cutEnergy, tmax);
142 std::max(recoilThreshold, (*pCuts)[Current << 168 G4double mom21 = t*(t + 2.0*electron_mass_c2);
143 << 169 G4double t1 = tkin - t;
144 // find out lightest element << 170 //G4cout << "tkin= " << tkin << " t= " << t << " t1= " << t1 << G4endl;
145 const G4ElementVector* theElementVector = ma << 171 if(t1 > 0.0) {
146 std::size_t nelm = material->GetNumberOfElem << 172 G4double mom22 = t1*(t1 + 2.0*mass);
147 << 173 G4double ctm = (mom2 + mom22 - mom21)*0.5/sqrt(mom2*mom22);
148 // select lightest element << 174 //G4cout << "ctm= " << ctm << G4endl;
149 G4int Z = 300; << 175 if(ctm < 1.0) cosTetMaxElec = ctm;
150 for (std::size_t j=0; j<nelm; ++j) { << 176 if(ctm < -1.0) cosTetMaxElec = -1.0;
151 Z = std::min(Z,(*theElementVector)[j]->Get << 177 }
152 } 178 }
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 } 179 }
159 180
160 //....oooOO0OOooo........oooOO0OOooo........oo 181 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
161 182
162 G4double G4eCoulombScatteringModel::ComputeCro 183 G4double G4eCoulombScatteringModel::ComputeCrossSectionPerAtom(
163 const G4ParticleDefinition* p, 184 const G4ParticleDefinition* p,
164 G4double kinEnergy, 185 G4double kinEnergy,
165 G4double Z, G4double, 186 G4double Z, G4double,
166 G4double cutEnergy, G4double) 187 G4double cutEnergy, G4double)
167 { 188 {
168 /* << 189 //G4cout << "### G4eCoulombScatteringModel::ComputeCrossSectionPerAtom for "
169 G4cout << "### G4eCoulombScatteringModel::Co << 190 // << p->GetParticleName()<<" Z= "<<Z<<" e(MeV)= "<< kinEnergy/MeV << G4endl;
170 << p->GetParticleName()<<" Z= "<<Z<<" e(MeV << 191 G4double xsec = 0.0;
171 << G4endl; << 192 SetupParticle(p);
172 */ <<
173 G4double cross = 0.0; <<
174 elecRatio = 0.0; <<
175 if(p != particle) { SetupParticle(p); } <<
176 193
177 // cross section is set to zero to avoid pro 194 // cross section is set to zero to avoid problems in sample secondary
178 if(kinEnergy <= 0.0) { return cross; } << 195 if(kinEnergy < lowEnergyLimit) { return xsec; }
179 DefineMaterial(CurrentCouple()); 196 DefineMaterial(CurrentCouple());
180 G4double costmin = wokvi->SetupKinematic(kin << 197 SetupKinematic(kinEnergy, cutEnergy);
>> 198 if(cosTetMaxNuc < cosTetMinNuc) {
>> 199 SetupTarget(Z, kinEnergy);
>> 200 xsec = CrossSectionPerAtom();
>> 201 }
>> 202 /*
>> 203 G4cout << "e(MeV)= " << kinEnergy/MeV << " xsec(b)= " << xsec/barn
>> 204 << "cosTetMinNuc= " << cosTetMinNuc
>> 205 << " cosTetMaxNuc= " << cosTetMaxNuc
>> 206 << " cosTetMaxElec= " << cosTetMaxElec
>> 207 << " screenZ= " << screenZ
>> 208 << " formfactA= " << formfactA << G4endl;
>> 209 */
>> 210 return xsec;
>> 211 }
>> 212
>> 213 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
181 214
182 //G4cout << "cosThetaMax= "<<cosThetaMax<<" << 215 G4double G4eCoulombScatteringModel::CrossSectionPerAtom()
>> 216 {
>> 217 // This method needs initialisation before be called
>> 218 //G4double fac = coeff*targetZ*chargeSquare*invbeta2/mom2;
183 219
184 if(cosThetaMax < costmin) { << 220 G4double meff = targetMass/(mass+targetMass);
185 G4int iz = G4lrint(Z); << 221 G4double fac = coeff*targetZ*chargeSquare*invbeta2/(mom2*meff*meff);
186 G4double cut = (0.0 < fixedCut) ? fixedCut << 222
187 costmin = wokvi->SetupTarget(iz, cut); << 223 elecXSection = 0.0;
188 //G4cout << "SetupTarget: Z= " << iz << " << 224 nucXSection = 0.0;
189 // << costmin << G4endl; << 225
190 G4double costmax = (1 == iz && particle == << 226 G4double x = 1.0 - cosTetMinNuc;
191 ? 0.0 : cosThetaMax; << 227 G4double x1 = x + screenZ;
192 if(costmin > costmax) { << 228
193 cross = wokvi->ComputeNuclearCrossSectio << 229 if(cosTetMaxElec2 < cosTetMinNuc) {
194 + wokvi->ComputeElectronCrossSection(c << 230 elecXSection = fac*(cosTetMinNuc - cosTetMaxElec2)/
>> 231 (x1*(1.0 - cosTetMaxElec2 + screenZ));
>> 232 nucXSection = elecXSection;
>> 233 }
>> 234
>> 235 //G4cout << "XS tkin(MeV)= " << tkin<<" xs= " <<nucXSection
>> 236 // << " costmax= " << cosTetMaxNuc2
>> 237 // << " costmin= " << cosTetMinNuc << " Z= " << targetZ <<G4endl;
>> 238 if(cosTetMaxNuc2 < cosTetMinNuc) {
>> 239 G4double s = screenZ*formfactA;
>> 240 G4double z1 = 1.0 - cosTetMaxNuc2 + screenZ;
>> 241 G4double s1 = 1.0 - s;
>> 242 G4double d = s1/formfactA;
>> 243 //G4cout <<"x1= "<<x1<<" z1= " <<z1<<" s= "<<s << " d= " <<d <<G4endl;
>> 244 if(d < 0.2*x1) {
>> 245 G4double x2 = x1*x1;
>> 246 G4double z2 = z1*z1;
>> 247 x = (1.0/(x1*x2) - 1.0/(z1*z2) - d*1.5*(1.0/(x2*x2) - 1.0/(z2*z2)))/
>> 248 (3.0*formfactA*formfactA);
>> 249 } else {
>> 250 G4double x2 = x1 + d;
>> 251 G4double z2 = z1 + d;
>> 252 x = (1.0/x1 - 1.0/z1 + 1.0/x2 - 1.0/z2 - 2.0*log(z1*x2/(z2*x1))/d)/(s1*s1);
195 } 253 }
196 /* << 254 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 } 255 }
206 //G4cout << "====== cross= " << cross << G4e << 256 //G4cout<<" cross(bn)= "<<nucXSection/barn<<" xsElec(bn)= "<<elecXSection/barn
207 return cross; << 257 // << " Asc= " << screenZ << G4endl;
>> 258
>> 259 return nucXSection;
208 } 260 }
209 261
210 //....oooOO0OOooo........oooOO0OOooo........oo 262 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
211 263
212 void G4eCoulombScatteringModel::SampleSecondar 264 void G4eCoulombScatteringModel::SampleSecondaries(
213 std::vector<G4DynamicParticle* 265 std::vector<G4DynamicParticle*>* fvect,
214 const G4MaterialCutsCouple* couple, 266 const G4MaterialCutsCouple* couple,
215 const G4DynamicParticle* dp, 267 const G4DynamicParticle* dp,
216 G4double cutEnergy, 268 G4double cutEnergy,
217 G4double) 269 G4double)
218 { 270 {
219 G4double kinEnergy = dp->GetKineticEnergy(); 271 G4double kinEnergy = dp->GetKineticEnergy();
220 SetupParticle(dp->GetDefinition()); << 272 if(kinEnergy < lowEnergyLimit) { return; }
221 DefineMaterial(couple); 273 DefineMaterial(couple);
222 /* << 274 SetupParticle(dp->GetDefinition());
223 G4cout << "G4eCoulombScatteringModel::Sample <<
224 << kinEnergy << " " << particle->GetPart <<
225 << " cut= " << cutEnergy<< G4endl; <<
226 */ <<
227 // Choose nucleus <<
228 G4double cut = (0.0 < fixedCut) ? fixedCut : <<
229 275
230 wokvi->SetupKinematic(kinEnergy, currentMate << 276 SetupKinematic(kinEnergy, cutEnergy);
>> 277 //G4cout << "G4eCoulombScatteringModel::SampleSecondaries e(MeV)= "
>> 278 // << kinEnergy << " " << particle->GetParticleName()
>> 279 // << " cut= " << cutEnergy<< G4endl;
>> 280
>> 281 // Choose nucleus
>> 282 currentElement = SelectRandomAtom(couple,particle,
>> 283 kinEnergy,cutEnergy,kinEnergy);
231 284
232 const G4Element* currentElement = SelectTarg << 285 SetupTarget(currentElement->GetZ(),kinEnergy);
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); <<
244 286
245 G4int ia = SelectIsotopeNumber(currentElemen 287 G4int ia = SelectIsotopeNumber(currentElement);
246 G4double targetMass = G4NucleiProperties::Ge << 288 targetMass = G4NucleiProperties::GetNuclearMass(ia, iz);
247 wokvi->SetTargetMass(targetMass); << 289
>> 290 G4double z1 = SampleCosineTheta();
>> 291 if(z1 <= 0.0) { return; }
>> 292 G4double cost = 1.0 - z1;
>> 293
>> 294 G4double sint = sqrt(z1*(1.0 + cost));
>> 295
>> 296 //G4cout<<"## Sampled sint= " << sint << " Z= " << targetZ << " A= " << ia
>> 297 // << " screenZ= " << screenZ << " cn= " << formfactA << G4endl;
>> 298
>> 299 G4double phi = twopi * G4UniformRand();
248 300
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 301 G4ThreeVector direction = dp->GetMomentumDirection();
>> 302 G4ThreeVector newDirection(cos(phi)*sint,sin(phi)*sint,cost);
261 newDirection.rotateUz(direction); 303 newDirection.rotateUz(direction);
262 304
263 fParticleChange->ProposeMomentumDirection(ne 305 fParticleChange->ProposeMomentumDirection(newDirection);
264 306
265 // recoil sampling assuming a small recoil 307 // recoil sampling assuming a small recoil
266 // and first order correction to primary 4-m 308 // and first order correction to primary 4-momentum
267 G4double mom2 = wokvi->GetMomentumSquare(); << 309 G4double q2 = 2*z1*mom2;
268 G4double trec = mom2*(1.0 - cost) << 310 G4double trec = q2/(sqrt(targetMass*targetMass + q2) + targetMass);
269 /(targetMass + (mass + kinEnergy)*(1.0 - c <<
270 <<
271 // the check likely not needed <<
272 trec = std::min(trec, kinEnergy); <<
273 G4double finalT = kinEnergy - trec; 311 G4double finalT = kinEnergy - trec;
274 G4double edep = 0.0; << 312 //G4cout<<"G4eCoulombScatteringModel: finalT= "<<finalT<<" Trec= "<<trec<<G4endl;
275 /* << 313 if(finalT <= lowEnergyLimit) {
276 G4cout<<"G4eCoulombScatteringModel: finalT << 314 trec = kinEnergy;
277 <<trec << " Z= " << iz << " A= " << ia << 315 finalT = 0.0;
278 << " tcut(keV)= " << (*pCuts)[currentMater << 316 }
279 */ << 317
>> 318 fParticleChange->SetProposedKineticEnergy(finalT);
280 G4double tcut = recoilThreshold; 319 G4double tcut = recoilThreshold;
281 if(pCuts) { tcut= std::max(tcut,(*pCuts)[cur 320 if(pCuts) { tcut= std::max(tcut,(*pCuts)[currentMaterialIndex]); }
282 321
283 if(trec > tcut) { 322 if(trec > tcut) {
284 G4ParticleDefinition* ion = theIonTable->G << 323 G4ParticleDefinition* ion = theParticleTable->FindIon(iz, ia, 0, iz);
285 G4ThreeVector dir = (direction*sqrt(mom2) 324 G4ThreeVector dir = (direction*sqrt(mom2) -
286 newDirection*sqrt(finalT*(2*mass + fina 325 newDirection*sqrt(finalT*(2*mass + finalT))).unit();
287 auto newdp = new G4DynamicParticle(ion, di << 326 G4DynamicParticle* newdp = new G4DynamicParticle(ion, dir, trec);
288 fvect->push_back(newdp); 327 fvect->push_back(newdp);
289 } else { 328 } else {
290 edep = trec; << 329 fParticleChange->ProposeLocalEnergyDeposit(trec);
291 fParticleChange->ProposeNonIonizingEnergyD << 330 fParticleChange->ProposeNonIonizingEnergyDeposit(trec);
292 } 331 }
>> 332
>> 333 return;
>> 334 }
293 335
294 // finelize primary energy and energy bala << 336 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
295 // this threshold may be applied only beca << 337
296 // e+e- msc model is applied << 338 G4double G4eCoulombScatteringModel::SampleCosineTheta()
297 if(finalT < 0.0) { << 339 {
298 edep += finalT; << 340 G4double costm = cosTetMaxNuc2;
299 finalT = 0.0; << 341 G4double formf = formfactA;
300 } << 342 G4double prob = 0.0;
301 edep = std::max(edep, 0.0); << 343 G4double xs = CrossSectionPerAtom();
302 fParticleChange->SetProposedKineticEnergy(fi << 344 if(xs > 0.0) prob = elecXSection/xs;
303 fParticleChange->ProposeLocalEnergyDeposit(e << 345
>> 346 // scattering off e or A?
>> 347 if(G4UniformRand() < prob) {
>> 348 costm = cosTetMaxElec2;
>> 349 formf = 0.0;
>> 350 }
>> 351
>> 352 /*
>> 353 G4cout << "SampleCost: e(MeV)= " << tkin
>> 354 << " 1-ctmaxN= " << 1. - cosTetMinNuc
>> 355 << " 1-ctmax= " << 1. - costm
>> 356 << " Z= " << targetZ
>> 357 << " screenZ= " << screenZ
>> 358 << " formf= " << formf
>> 359 << G4endl;
>> 360 */
>> 361
>> 362 if(costm >= cosTetMinNuc) return 0.0;
>> 363
>> 364 G4double x1 = 1. - cosTetMinNuc + screenZ;
>> 365 G4double x2 = 1. - costm + screenZ;
>> 366 G4double x3 = cosTetMinNuc - costm;
>> 367 G4double grej, z1;
>> 368 do {
>> 369 z1 = x1*x2/(x1 + G4UniformRand()*x3) - screenZ;
>> 370 grej = 1.0/(1.0 + formf*z1);
>> 371 //G4cout << "z1= " << z1 << " grej= " << grej << " x1= " << x1
>> 372 // <<" x2= " << x2 <<" x3= " << x3 << G4endl;
>> 373 } while ( G4UniformRand() > grej*grej );
>> 374
>> 375 if(mass > MeV) {
>> 376 if(G4UniformRand() > (1. - z1*0.5)/(1.0 + z1*sqrt(mom2)/targetMass)) {
>> 377 return 0.0;
>> 378 }
>> 379 }
>> 380
>> 381 // G4cout << "z1= " << z1 << " cross= " << nucXSection/barn
>> 382 // << " crossE= " << elecXSection/barn << G4endl;
>> 383
>> 384 return z1;
304 } 385 }
305 386
306 //....oooOO0OOooo........oooOO0OOooo........oo 387 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 388
>> 389
307 390