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Geant4/processes/electromagnetic/standard/src/G4eCoulombScatteringModel.cc

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Differences between /processes/electromagnetic/standard/src/G4eCoulombScatteringModel.cc (Version 11.3.0) and /processes/electromagnetic/standard/src/G4eCoulombScatteringModel.cc (Version 9.1.p3)


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                                                   >>  26 // $Id: G4eCoulombScatteringModel.cc,v 1.40 2008/01/07 08:32:01 vnivanch Exp $
                                                   >>  27 // GEANT4 tag $Name: geant4-09-01-patch-03 $
 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- 
 41 //                                                 46 //
 42 // Class Description:                              47 // Class Description:
 43 //                                                 48 //
 44 // -------------------------------------------     49 // -------------------------------------------------------------------
 45 //                                                 50 //
 46 //....oooOO0OOooo........oooOO0OOooo........oo     51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 47 //....oooOO0OOooo........oooOO0OOooo........oo     52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 48                                                    53 
 49 #include "G4eCoulombScatteringModel.hh"            54 #include "G4eCoulombScatteringModel.hh"
 50 #include "G4PhysicalConstants.hh"              << 
 51 #include "G4SystemOfUnits.hh"                  << 
 52 #include "Randomize.hh"                            55 #include "Randomize.hh"
 53 #include "G4DataVector.hh"                         56 #include "G4DataVector.hh"
 54 #include "G4ElementTable.hh"                       57 #include "G4ElementTable.hh"
                                                   >>  58 #include "G4PhysicsLogVector.hh"
 55 #include "G4ParticleChangeForGamma.hh"             59 #include "G4ParticleChangeForGamma.hh"
                                                   >>  60 #include "G4Electron.hh"
                                                   >>  61 #include "G4Positron.hh"
 56 #include "G4Proton.hh"                             62 #include "G4Proton.hh"
 57 #include "G4ParticleTable.hh"                  << 
 58 #include "G4IonTable.hh"                       << 
 59 #include "G4ProductionCutsTable.hh"            << 
 60 #include "G4NucleiProperties.hh"               << 
 61 #include "G4Pow.hh"                            << 
 62 #include "G4NistManager.hh"                    << 
 63                                                    63 
 64 //....oooOO0OOooo........oooOO0OOooo........oo     64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 65                                                    65 
 66 using namespace std;                               66 using namespace std;
 67                                                    67 
 68 G4eCoulombScatteringModel::G4eCoulombScatterin <<  68 G4eCoulombScatteringModel::G4eCoulombScatteringModel(
 69   : G4VEmModel("eCoulombScattering"), isCombin <<  69   G4double thetaMin, G4double thetaMax, G4bool build, 
                                                   >>  70   G4double tlim, const G4String& nam)
                                                   >>  71   : G4VEmModel(nam),
                                                   >>  72     cosThetaMin(cos(thetaMin)),
                                                   >>  73     cosThetaMax(cos(thetaMax)),
                                                   >>  74     q2Limit(tlim),
                                                   >>  75     theCrossSectionTable(0),
                                                   >>  76     lowKEnergy(keV),
                                                   >>  77     highKEnergy(TeV),
                                                   >>  78     alpha2(fine_structure_const*fine_structure_const),
                                                   >>  79     faclim(100.0),
                                                   >>  80     nbins(12),
                                                   >>  81     nmax(100),
                                                   >>  82     buildTable(build),
                                                   >>  83     isInitialised(false)
 70 {                                                  84 {
 71   fNistManager = G4NistManager::Instance();        85   fNistManager = G4NistManager::Instance();
 72   theIonTable  = G4ParticleTable::GetParticleT <<  86   theElectron = G4Electron::Electron();
 73   theProton    = G4Proton::Proton();           <<  87   thePositron = G4Positron::Positron();
 74                                                <<  88   theProton   = G4Proton::Proton();
 75   wokvi = new G4WentzelOKandVIxSection(isCombi <<  89   a0 = alpha2*electron_mass_c2*electron_mass_c2/(0.885*0.885);
 76                                                <<  90   G4double p0 = electron_mass_c2*classic_electr_radius;
 77   mass = CLHEP::proton_mass_c2;                <<  91   coeff  = twopi*p0*p0;
                                                   >>  92   constn = 6.937e-6/(MeV*MeV);
                                                   >>  93   tkin = targetZ = targetA = mom2 = DBL_MIN;
                                                   >>  94   elecXSection = nucXSection = 0.0;
                                                   >>  95   ecut = DBL_MAX;
                                                   >>  96   particle = 0;
                                                   >>  97   for(size_t j=0; j<100; j++) {index[j] = -1;} 
 78 }                                                  98 }
 79                                                    99 
 80 //....oooOO0OOooo........oooOO0OOooo........oo    100 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 81                                                   101 
 82 G4eCoulombScatteringModel::~G4eCoulombScatteri    102 G4eCoulombScatteringModel::~G4eCoulombScatteringModel()
 83 {                                                 103 {
 84   delete wokvi;                                << 104   if(theCrossSectionTable) {
                                                   >> 105     theCrossSectionTable->clearAndDestroy();
                                                   >> 106     delete theCrossSectionTable;
                                                   >> 107   }
 85 }                                                 108 }
 86                                                   109 
 87 //....oooOO0OOooo........oooOO0OOooo........oo    110 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 88                                                   111 
 89 void G4eCoulombScatteringModel::Initialise(con << 112 void G4eCoulombScatteringModel::Initialise(const G4ParticleDefinition* p,
 90              const G4DataVector& cuts)         << 113              const G4DataVector&)
 91 {                                                 114 {
 92   SetupParticle(part);                         << 115   //  G4cout << "!!! G4eCoulombScatteringModel::Initialise for " 
 93   currentCouple = nullptr;                     << 116   // << p->GetParticleName() << "  cos(TetMin)= " << cosThetaMin 
 94                                                << 117   // << "  cos(TetMax)= " << cosThetaMax <<G4endl;
 95   G4double tet = PolarAngleLimit();            << 118   if(!isInitialised) {
 96                                                << 119     isInitialised = true;
 97   // defined theta limit between single and mu << 120 
 98   if(isCombined) {                             << 121     if(pParticleChange)
 99     if(tet >= CLHEP::pi) { cosThetaMin = -1.0; << 122       fParticleChange = 
100     else if(tet > 0.0) { cosThetaMin = std::co << 123   reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
101                                                << 124     else
102     // single scattering without multiple      << 125       fParticleChange = new G4ParticleChangeForGamma();
103   } else if(tet > 0.0) {                       << 126   } else {
104     cosThetaMin = std::cos(std::min(tet, CLHEP << 127     return;
105   }                                               128   }
106                                                   129 
107   wokvi->Initialise(part, cosThetaMin);        << 130   if(p->GetParticleType() == "nucleus") buildTable = false;
108   pCuts = &cuts;                               << 131   if(!buildTable) return;
109   /*                                           << 132 
110   G4cout << "G4eCoulombScatteringModel::Initia << 133   // Compute log cross section table per atom
111      << part->GetParticleName() << " 1-cos(Tet << 134   if(!theCrossSectionTable) theCrossSectionTable = new G4PhysicsTable();
112      << " 1-cos(TetMax)= " << 1. - cosThetaMax << 135   
113   G4cout << "cut[0]= " << (*pCuts)[0] << G4end << 136   nbins = 2*G4int(log10(highKEnergy/lowKEnergy));
114   */                                           << 
115   if(nullptr == fParticleChange) {             << 
116     fParticleChange = GetParticleChangeForGamm << 
117   }                                            << 
118   if(IsMaster() && mass < GeV && part->GetPart << 
119     InitialiseElementSelectors(part, cuts);    << 
120   }                                            << 
121 }                                                 137 }
122                                                   138 
123 //....oooOO0OOooo........oooOO0OOooo........oo    139 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
124                                                   140 
125 void G4eCoulombScatteringModel::InitialiseLoca << 141 G4double G4eCoulombScatteringModel::ComputeCrossSectionPerAtom(
126             G4VEmModel* masterModel)           << 142                 const G4ParticleDefinition* p,
                                                   >> 143     G4double kinEnergy,
                                                   >> 144     G4double Z, G4double A,
                                                   >> 145     G4double cutEnergy, G4double)
127 {                                                 146 {
128   SetElementSelectors(masterModel->GetElementS << 147   if(p == particle && kinEnergy == tkin && Z == targetZ &&
                                                   >> 148      A == targetA && cutEnergy == ecut) return nucXSection;
                                                   >> 149 
                                                   >> 150   //G4cout << "### G4eCoulombScatteringModel::ComputeCrossSectionPerAtom  for " 
                                                   >> 151   //   << p->GetParticleName() << " Z= " << Z << " A= " << A 
                                                   >> 152   //   << " e= " << kinEnergy << G4endl; 
                                                   >> 153 
                                                   >> 154   nucXSection = ComputeElectronXSectionPerAtom(p,kinEnergy,Z,A,cutEnergy);
                                                   >> 155 
                                                   >> 156   // nuclear cross section
                                                   >> 157   if(theCrossSectionTable) {
                                                   >> 158     G4bool b;
                                                   >> 159     G4int iz  = G4int(Z);
                                                   >> 160     G4int idx = index[iz];
                                                   >> 161 
                                                   >> 162     // compute table for given Z
                                                   >> 163     if(-1 == idx) {
                                                   >> 164       idx = theCrossSectionTable->size();
                                                   >> 165       index[iz] = idx;
                                                   >> 166       G4PhysicsLogVector* ptrVector
                                                   >> 167   = new G4PhysicsLogVector(lowKEnergy, highKEnergy, nbins);
                                                   >> 168       //  G4cout << "New vector Z= " << iz << " A= " << A << " idx= " << idx << G4endl; 
                                                   >> 169       G4double e, value;
                                                   >> 170       for(G4int i=0; i<=nbins; i++) {
                                                   >> 171   e     = ptrVector->GetLowEdgeEnergy( i ) ;
                                                   >> 172   value = CalculateCrossSectionPerAtom(p, e, Z, A);  
                                                   >> 173   ptrVector->PutValue( i, log(value) );
                                                   >> 174       }
                                                   >> 175       theCrossSectionTable->push_back(ptrVector);
                                                   >> 176     }
                                                   >> 177 
                                                   >> 178       // take value from the table
                                                   >> 179     nucXSection += 
                                                   >> 180       std::exp((((*theCrossSectionTable)[idx]))->GetValue(kinEnergy, b));
                                                   >> 181 
                                                   >> 182     // compute value from scratch
                                                   >> 183   } else nucXSection += CalculateCrossSectionPerAtom(p, kinEnergy, Z, A);
                                                   >> 184   
                                                   >> 185   //  G4cout << " cross(bn)= " << nucXSection/barn << G4endl; 
                                                   >> 186   
                                                   >> 187   if(nucXSection < 0.0) nucXSection = 0.0;
                                                   >> 188   return nucXSection;
129 }                                                 189 }
130                                                   190 
131 //....oooOO0OOooo........oooOO0OOooo........oo << 191 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
132                                                   192 
133 G4double                                       << 193 G4double G4eCoulombScatteringModel::ComputeElectronXSectionPerAtom(
134 G4eCoulombScatteringModel::MinPrimaryEnergy(co << 194                 const G4ParticleDefinition* p,
135               const G4ParticleDefinition* part << 195     G4double kinEnergy,
136               G4double)                        << 196     G4double Z,
                                                   >> 197     G4double A,
                                                   >> 198     G4double cutEnergy)
137 {                                                 199 {
138   SetupParticle(part);                         << 200   if(p == particle && kinEnergy == tkin && Z == targetZ &&
                                                   >> 201      cutEnergy == ecut) return elecXSection;
                                                   >> 202   ecut = cutEnergy;
                                                   >> 203   elecXSection = 0.0;
                                                   >> 204   SetupParticle(p);
                                                   >> 205   G4double ekin = std::max(keV, kinEnergy);
                                                   >> 206   //G4double ekin = kinEnergy;
                                                   >> 207   SetupTarget(Z, A, ekin);
                                                   >> 208 
                                                   >> 209   G4double tmax = tkin;
                                                   >> 210   if(p == theElectron) tmax *= 0.5;
                                                   >> 211   else if(p != thePositron) {
                                                   >> 212     G4double ratio = electron_mass_c2/mass;
                                                   >> 213     G4double tau = tkin/mass;
                                                   >> 214     tmax = 2.0*electron_mass_c2*tau*(tau + 2.)/
                                                   >> 215       (1.0 + 2.0*ratio*(tau + 1.0) + ratio*ratio); 
                                                   >> 216   }
139                                                   217 
140   // define cut using cuts for proton          << 218   cosTetMaxElec = cosTetMaxNuc;
141   G4double cut =                               << 219   G4double t = std::min(cutEnergy, tmax);
142     std::max(recoilThreshold, (*pCuts)[Current << 220   G4double mom21 = t*(t + 2.0*electron_mass_c2);
143                                                << 221   G4double t1 = tkin - t;
144   // find out lightest element                 << 222   if(t1 > 0.0) {
145   const G4ElementVector* theElementVector = ma << 223     G4double mom22 = t1*(t1 + 2.0*mass);
146   std::size_t nelm = material->GetNumberOfElem << 224     G4double ctm = (mom2 + mom22 - mom21)*0.5/sqrt(mom2*mom22);
147                                                << 225     if(ctm > cosTetMaxElec && ctm <= 1.0) cosTetMaxElec = ctm;
148   // select lightest element                   << 
149   G4int Z = 300;                               << 
150   for (std::size_t j=0; j<nelm; ++j) {         << 
151     Z = std::min(Z,(*theElementVector)[j]->Get << 
152   }                                               226   }
153   G4int A = G4lrint(fNistManager->GetAtomicMas << 
154   G4double targetMass = G4NucleiProperties::Ge << 
155   G4double t = std::max(cut, 0.5*(cut + sqrt(2 << 
156                                                   227 
157   return t;                                    << 228   if(cosTetMaxElec < cosThetaMin) {
                                                   >> 229     G4double x1 = 1.0 - cosThetaMin  + screenZ;
                                                   >> 230     G4double x2 = 1.0 - cosTetMaxElec + screenZ;
                                                   >> 231     elecXSection = coeff*Z*chargeSquare*invbeta2*
                                                   >> 232       (cosThetaMin - cosTetMaxElec)/(x1*x2*mom2);
                                                   >> 233   }
                                                   >> 234   //  G4cout << "cut= " << ecut << " e= " << tkin 
                                                   >> 235   // << " croosE(barn)= " << elecXSection/barn 
                                                   >> 236   // << " cosEl= " << cosTetMaxElec << " costmin= " << cosThetaMin << G4endl;
                                                   >> 237   return elecXSection;
158 }                                                 238 }
159                                                   239 
160 //....oooOO0OOooo........oooOO0OOooo........oo << 240 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
161                                                   241 
162 G4double G4eCoulombScatteringModel::ComputeCro << 242 G4double G4eCoulombScatteringModel::CalculateCrossSectionPerAtom(
163                 const G4ParticleDefinition* p, << 243                  const G4ParticleDefinition* p,
164     G4double kinEnergy,                        << 244            G4double kinEnergy, 
165     G4double Z, G4double,                      << 245            G4double Z, G4double A)
166     G4double cutEnergy, G4double)              << 
167 {                                                 246 {
168   /*                                           << 
169   G4cout << "### G4eCoulombScatteringModel::Co << 
170    << p->GetParticleName()<<" Z= "<<Z<<" e(MeV << 
171    << G4endl;                                  << 
172   */                                           << 
173   G4double cross = 0.0;                           247   G4double cross = 0.0;
174   elecRatio = 0.0;                             << 248   SetupParticle(p);
175   if(p != particle) { SetupParticle(p); }      << 249   G4double ekin = std::max(keV, kinEnergy);
176                                                << 250   //G4double ekin = kinEnergy;
177   // cross section is set to zero to avoid pro << 251   SetupTarget(Z, A, ekin);
178   if(kinEnergy <= 0.0) { return cross; }       << 252 
179   DefineMaterial(CurrentCouple());             << 253   if(cosTetMaxNuc < cosThetaMin) {
180   G4double costmin = wokvi->SetupKinematic(kin << 254     G4double x1 = 1.0 - cosThetaMin;
181                                                << 255     G4double x2 = 1.0 - cosTetMaxNuc;
182   //G4cout << "cosThetaMax= "<<cosThetaMax<<"  << 256     G4double x3 = cosThetaMin - cosTetMaxNuc;
183                                                << 257     G4double z1 = x1 + screenZ;
184   if(cosThetaMax < costmin) {                  << 258     G4double z2 = x2 + screenZ;
185     G4int iz = G4lrint(Z);                     << 259     G4double d  = 1.0/formfactA - screenZ;
186     G4double cut = (0.0 < fixedCut) ? fixedCut << 260     G4double d1 = 1.0 - formfactA*screenZ;
187     costmin = wokvi->SetupTarget(iz, cut);     << 261     G4double zn1= x1 + d;
188     //G4cout << "SetupTarget: Z= " << iz << "  << 262     G4double zn2= x2 + d;
189     //     << costmin << G4endl;               << 263     cross = coeff*Z*Z*chargeSquare*invbeta2
190     G4double costmax = (1 == iz && particle == << 264       *(x3/(z1*z2) + x3/(zn1*zn2) + 
191       ? 0.0 : cosThetaMax;                     << 265   2.0*std::log(z1*zn2/(z2*zn1))/d) / (mom2*d1*d1);
192     if(costmin > costmax) {                    << 
193       cross = wokvi->ComputeNuclearCrossSectio << 
194         + wokvi->ComputeElectronCrossSection(c << 
195     }                                          << 
196     /*                                         << 
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   }                                               266   }
206   //G4cout << "====== cross= " << cross << G4e << 267   
207   return cross;                                << 268   //  G4cout << "CalculateCrossSectionPerAtom: e(MeV)= " << tkin 
                                                   >> 269   // << " cross(b)= " << cross/barn << " ctmin= " << cosThetaMin
                                                   >> 270   // << " ctmax= " << cosTetMaxNuc << G4endl;
                                                   >> 271   
                                                   >> 272   return cross;
208 }                                                 273 }
209                                                   274 
210 //....oooOO0OOooo........oooOO0OOooo........oo    275 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
211                                                   276 
212 void G4eCoulombScatteringModel::SampleSecondar    277 void G4eCoulombScatteringModel::SampleSecondaries(
213                 std::vector<G4DynamicParticle* << 278                 std::vector<G4DynamicParticle*>*,
214     const G4MaterialCutsCouple* couple,           279     const G4MaterialCutsCouple* couple,
215     const G4DynamicParticle* dp,                  280     const G4DynamicParticle* dp,
216     G4double cutEnergy,                           281     G4double cutEnergy,
217     G4double)                                  << 282     G4double maxEnergy)
218 {                                                 283 {
                                                   >> 284   const G4Material* aMaterial = couple->GetMaterial();
                                                   >> 285   const G4ParticleDefinition* p = dp->GetDefinition();
219   G4double kinEnergy = dp->GetKineticEnergy();    286   G4double kinEnergy = dp->GetKineticEnergy();
220   SetupParticle(dp->GetDefinition());          << 287 
221   DefineMaterial(couple);                      << 288   // Select atom and setup
                                                   >> 289   SetupParticle(p);
                                                   >> 290   const G4Element* elm = 
                                                   >> 291     SelectRandomAtom(aMaterial,p,kinEnergy,cutEnergy,maxEnergy);
                                                   >> 292   G4double Z  = elm->GetZ();
                                                   >> 293   G4double A  = elm->GetN();
                                                   >> 294 
                                                   >> 295   G4double cross = 
                                                   >> 296     ComputeCrossSectionPerAtom(p,kinEnergy,Z,A,cutEnergy,maxEnergy);
                                                   >> 297 
                                                   >> 298   G4double costm = cosTetMaxNuc;
                                                   >> 299   G4double formf = formfactA;
                                                   >> 300   if(G4UniformRand()*cross < elecXSection) {
                                                   >> 301     costm = cosTetMaxElec;
                                                   >> 302     formf = 0.0;
                                                   >> 303   }
222   /*                                              304   /*
223   G4cout << "G4eCoulombScatteringModel::Sample << 305   G4cout << "G4eCoul...SampleSecondaries: e(MeV)= " << tkin 
224      << kinEnergy << "  " << particle->GetPart << 306      << " ctmin= " << cosThetaMin
225      << " cut= " << cutEnergy<< G4endl;        << 307      << " ctmaxN= " << cosTetMaxNuc
                                                   >> 308      << " ctmax= " << costm
                                                   >> 309      << " Z= " << Z << " A= " << A
                                                   >> 310      << " cross= " << cross/barn << " crossE= " << elecXSection/barn
                                                   >> 311      << G4endl;
226   */                                              312   */
227   // Choose nucleus                            << 313   if(costm >= cosThetaMin) return; 
228   G4double cut = (0.0 < fixedCut) ? fixedCut : << 
229                                                   314 
230   wokvi->SetupKinematic(kinEnergy, currentMate << 315   G4double x1 = 1. - cosThetaMin + screenZ;
                                                   >> 316   G4double x2 = 1. - costm;
                                                   >> 317   G4double x3 = cosThetaMin - costm;
                                                   >> 318   G4double grej,  z, z1; 
                                                   >> 319   do {
                                                   >> 320     z  = G4UniformRand()*x3;
                                                   >> 321     z1 = (x1*x2 - screenZ*z)/(x1 + z);
                                                   >> 322     if(z1 < 0.0) z1 = 0.0;
                                                   >> 323     else if(z1 > 2.0) z1 = 2.0;
                                                   >> 324     grej = 1.0/(1.0 + formf*z1);
                                                   >> 325   } while ( G4UniformRand() > grej*grej );  
                                                   >> 326   
                                                   >> 327   G4double cost = 1.0 - z1;
                                                   >> 328   G4double sint= sqrt(z1*(2.0 - z1));
                                                   >> 329   /*
                                                   >> 330   if(sint > 0.1) 
                                                   >> 331     G4cout<<"## SampleSecondaries: e(MeV)= " << kinEnergy
                                                   >> 332     << " sint= " << sint << "  Z= " << Z << "  screenZ= " << screenZ 
                                                   >> 333     << " cn= " << formf
                                                   >> 334     << G4endl;
                                                   >> 335   */
                                                   >> 336   G4double phi  = twopi * G4UniformRand();
231                                                   337 
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    338   G4ThreeVector direction = dp->GetMomentumDirection(); 
                                                   >> 339   G4ThreeVector newDirection(cos(phi)*sint,sin(phi)*sint,cost);
261   newDirection.rotateUz(direction);               340   newDirection.rotateUz(direction);   
262                                                   341 
263   fParticleChange->ProposeMomentumDirection(ne    342   fParticleChange->ProposeMomentumDirection(newDirection);   
264                                                << 343  
265   // recoil sampling assuming a small recoil   << 344   return;
266   // and first order correction to primary 4-m << 
267   G4double mom2 = wokvi->GetMomentumSquare();  << 
268   G4double trec = mom2*(1.0 - cost)            << 
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;          << 
274   G4double edep = 0.0;                         << 
275     /*                                         << 
276     G4cout<<"G4eCoulombScatteringModel: finalT << 
277     <<trec << " Z= " << iz << " A= " << ia     << 
278     << " tcut(keV)= " << (*pCuts)[currentMater << 
279     */                                         << 
280   G4double tcut = recoilThreshold;             << 
281   if(pCuts) { tcut= std::max(tcut,(*pCuts)[cur << 
282                                                << 
283   if(trec > tcut) {                            << 
284     G4ParticleDefinition* ion = theIonTable->G << 
285     G4ThreeVector dir = (direction*sqrt(mom2)  << 
286        newDirection*sqrt(finalT*(2*mass + fina << 
287     auto newdp = new G4DynamicParticle(ion, di << 
288     fvect->push_back(newdp);                   << 
289   } else {                                     << 
290     edep = trec;                               << 
291     fParticleChange->ProposeNonIonizingEnergyD << 
292   }                                            << 
293                                                << 
294     // finelize primary energy and energy bala << 
295     // this threshold may be applied only beca << 
296     // e+e- msc model is applied               << 
297   if(finalT < 0.0) {                           << 
298     edep += finalT;                            << 
299     finalT = 0.0;                              << 
300   }                                            << 
301   edep = std::max(edep, 0.0);                  << 
302   fParticleChange->SetProposedKineticEnergy(fi << 
303   fParticleChange->ProposeLocalEnergyDeposit(e << 
304 }                                                 345 }
305                                                   346 
306 //....oooOO0OOooo........oooOO0OOooo........oo    347 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
                                                   >> 348 
                                                   >> 349 
307                                                   350