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25 // 25 //
>> 26 // $Id: G4PAIModel.cc 106217 2017-09-21 00:03:23Z gcosmo $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class 30 // GEANT4 Class
30 // File name: G4PAIModel.cc 31 // File name: G4PAIModel.cc
31 // 32 //
32 // Author: Vladimir.Grichine@cern.ch on base o 33 // Author: Vladimir.Grichine@cern.ch on base of V.Ivanchenko model interface
33 // 34 //
34 // Creation date: 05.10.2003 35 // Creation date: 05.10.2003
35 // 36 //
36 // Modifications: 37 // Modifications:
37 // 38 //
38 // 17.08.04 V.Grichine, bug fixed for Tkin<=0 39 // 17.08.04 V.Grichine, bug fixed for Tkin<=0 in SampleSecondary
39 // 16.08.04 V.Grichine, bug fixed in massRatio 40 // 16.08.04 V.Grichine, bug fixed in massRatio for DEDX, CrossSection,
40 // SampleSecondary 41 // SampleSecondary
41 // 08.04.05 Major optimisation of internal int 42 // 08.04.05 Major optimisation of internal interfaces (V.Ivantchenko)
42 // 26.07.09 Fixed logic to work with several m 43 // 26.07.09 Fixed logic to work with several materials (V.Ivantchenko)
43 // 21.11.10 V. Grichine verbose flag for proto 44 // 21.11.10 V. Grichine verbose flag for protons and G4PAYySection to
44 // check sandia table 45 // check sandia table
45 // 12.06.13 V. Grichine Bug fixed in SampleSec 46 // 12.06.13 V. Grichine Bug fixed in SampleSecondaries for scaled Tkin
46 // (fMass -> proton_mass_c2) 47 // (fMass -> proton_mass_c2)
47 // 19.08.13 V.Ivanchenko extract data handling 48 // 19.08.13 V.Ivanchenko extract data handling to G4PAIModelData class
48 // added sharing of internal data bet 49 // added sharing of internal data between threads (MT migration)
49 // 50 //
50 51
51 #include "G4PAIModel.hh" 52 #include "G4PAIModel.hh"
52 53
53 #include "G4SystemOfUnits.hh" 54 #include "G4SystemOfUnits.hh"
54 #include "G4PhysicalConstants.hh" 55 #include "G4PhysicalConstants.hh"
55 #include "G4Region.hh" 56 #include "G4Region.hh"
56 #include "G4MaterialCutsCouple.hh" 57 #include "G4MaterialCutsCouple.hh"
57 #include "G4MaterialTable.hh" 58 #include "G4MaterialTable.hh"
58 #include "G4RegionStore.hh" 59 #include "G4RegionStore.hh"
59 60
60 #include "Randomize.hh" 61 #include "Randomize.hh"
61 #include "G4Electron.hh" 62 #include "G4Electron.hh"
62 #include "G4Positron.hh" 63 #include "G4Positron.hh"
63 #include "G4Poisson.hh" 64 #include "G4Poisson.hh"
64 #include "G4Step.hh" 65 #include "G4Step.hh"
65 #include "G4Material.hh" 66 #include "G4Material.hh"
66 #include "G4DynamicParticle.hh" 67 #include "G4DynamicParticle.hh"
67 #include "G4ParticleDefinition.hh" 68 #include "G4ParticleDefinition.hh"
68 #include "G4ParticleChangeForLoss.hh" 69 #include "G4ParticleChangeForLoss.hh"
69 #include "G4PAIModelData.hh" 70 #include "G4PAIModelData.hh"
70 #include "G4DeltaAngle.hh" 71 #include "G4DeltaAngle.hh"
71 72
72 ////////////////////////////////////////////// 73 ////////////////////////////////////////////////////////////////////////
73 74
74 using namespace std; 75 using namespace std;
75 76
76 G4PAIModel::G4PAIModel(const G4ParticleDefinit 77 G4PAIModel::G4PAIModel(const G4ParticleDefinition* p, const G4String& nam)
77 : G4VEmModel(nam),G4VEmFluctuationModel(nam) 78 : G4VEmModel(nam),G4VEmFluctuationModel(nam),
78 fVerbose(0), 79 fVerbose(0),
79 fModelData(nullptr), 80 fModelData(nullptr),
80 fParticle(nullptr) 81 fParticle(nullptr)
81 { 82 {
82 fElectron = G4Electron::Electron(); 83 fElectron = G4Electron::Electron();
83 fPositron = G4Positron::Positron(); 84 fPositron = G4Positron::Positron();
84 85
85 fParticleChange = nullptr; 86 fParticleChange = nullptr;
86 87
87 if(p) { SetParticle(p); } 88 if(p) { SetParticle(p); }
88 else { SetParticle(fElectron); } 89 else { SetParticle(fElectron); }
89 90
90 // default generator 91 // default generator
91 SetAngularDistribution(new G4DeltaAngle()); 92 SetAngularDistribution(new G4DeltaAngle());
92 fLowestTcut = 12.5*CLHEP::eV; 93 fLowestTcut = 12.5*CLHEP::eV;
93 } 94 }
94 95
95 ////////////////////////////////////////////// 96 ////////////////////////////////////////////////////////////////////////////
96 97
97 G4PAIModel::~G4PAIModel() 98 G4PAIModel::~G4PAIModel()
98 { 99 {
99 if(IsMaster()) { delete fModelData; } 100 if(IsMaster()) { delete fModelData; }
100 } 101 }
101 102
102 ////////////////////////////////////////////// 103 ////////////////////////////////////////////////////////////////////////////
103 104
104 void G4PAIModel::Initialise(const G4ParticleDe 105 void G4PAIModel::Initialise(const G4ParticleDefinition* p,
105 const G4DataVector& cuts) 106 const G4DataVector& cuts)
106 { 107 {
107 if(fVerbose > 1) { << 108 if(fVerbose > 0) {
108 G4cout<<"G4PAIModel::Initialise for "<<p-> 109 G4cout<<"G4PAIModel::Initialise for "<<p->GetParticleName()<<G4endl;
109 } 110 }
110 SetParticle(p); 111 SetParticle(p);
111 fParticleChange = GetParticleChangeForLoss() 112 fParticleChange = GetParticleChangeForLoss();
112 113
113 if(IsMaster()) { 114 if(IsMaster()) {
114 115
115 delete fModelData; 116 delete fModelData;
116 fMaterialCutsCoupleVector.clear(); 117 fMaterialCutsCoupleVector.clear();
117 if(fVerbose > 1) { << 118 if(fVerbose > 0) {
118 G4cout << "G4PAIModel instantiates data 119 G4cout << "G4PAIModel instantiates data for " << p->GetParticleName()
119 << G4endl; 120 << G4endl;
120 } 121 }
121 G4double tmin = LowEnergyLimit()*fRatio; 122 G4double tmin = LowEnergyLimit()*fRatio;
122 G4double tmax = HighEnergyLimit()*fRatio; 123 G4double tmax = HighEnergyLimit()*fRatio;
123 fModelData = new G4PAIModelData(tmin, tmax 124 fModelData = new G4PAIModelData(tmin, tmax, fVerbose);
124 125
125 // Prepare initialization 126 // Prepare initialization
126 const G4MaterialTable* theMaterialTable = 127 const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
127 std::size_t numOfMat = G4Material::GetNu << 128 size_t numOfMat = G4Material::GetNumberOfMaterials();
128 std::size_t numRegions = fPAIRegionVector. << 129 size_t numRegions = fPAIRegionVector.size();
129 130
130 // protect for unit tests 131 // protect for unit tests
131 if(0 == numRegions) { 132 if(0 == numRegions) {
132 G4Exception("G4PAIModel::Initialise()"," 133 G4Exception("G4PAIModel::Initialise()","em0106",JustWarning,
133 "no G4Regions are registered 134 "no G4Regions are registered for the PAI model - World is used");
134 fPAIRegionVector.push_back(G4RegionStore 135 fPAIRegionVector.push_back(G4RegionStore::GetInstance()
135 ->GetRegion("DefaultRegionForTheWorld 136 ->GetRegion("DefaultRegionForTheWorld", false));
136 numRegions = 1; 137 numRegions = 1;
137 } 138 }
138 139
139 if(fVerbose > 1) { << 140 if(fVerbose > 0) {
140 G4cout << "G4PAIModel is defined for " < 141 G4cout << "G4PAIModel is defined for " << numRegions << " regions "
141 << "; number of materials " << numOfMat << 142 << G4endl;
>> 143 G4cout << " total number of materials " << numOfMat << G4endl;
142 } 144 }
143 for(std::size_t iReg = 0; iReg<numRegions; << 145 for(size_t iReg = 0; iReg<numRegions; ++iReg) {
144 const G4Region* curReg = fPAIRegionVecto 146 const G4Region* curReg = fPAIRegionVector[iReg];
145 G4Region* reg = const_cast<G4Region*>(cu 147 G4Region* reg = const_cast<G4Region*>(curReg);
146 148
147 for(std::size_t jMat = 0; jMat<numOfMat; << 149 for(size_t jMat = 0; jMat<numOfMat; ++jMat) {
148 G4Material* mat = (*theMaterialTable)[jMat]; 150 G4Material* mat = (*theMaterialTable)[jMat];
149 const G4MaterialCutsCouple* cutCouple = reg- 151 const G4MaterialCutsCouple* cutCouple = reg->FindCouple(mat);
150 std::size_t n = fMaterialCutsCoupleVector.si << 152 size_t n = fMaterialCutsCoupleVector.size();
151 if(nullptr != cutCouple) { << 153 /*
152 if(fVerbose > 1) { << 154 G4cout << "Region: " << reg->GetName() << " " << reg
>> 155 << " Couple " << cutCouple
>> 156 << " PAI defined for " << n << " couples"
>> 157 << " jMat= " << jMat << " " << mat->GetName()
>> 158 << G4endl;
>> 159 */
>> 160 if(cutCouple) {
>> 161 if(fVerbose > 0) {
153 G4cout << "Region <" << curReg->GetName( 162 G4cout << "Region <" << curReg->GetName() << "> mat <"
154 << mat->GetName() << "> CoupleIndex= " 163 << mat->GetName() << "> CoupleIndex= "
155 << cutCouple->GetIndex() 164 << cutCouple->GetIndex()
156 << " " << p->GetParticleName() 165 << " " << p->GetParticleName()
157 << " cutsize= " << cuts.size() << G4end 166 << " cutsize= " << cuts.size() << G4endl;
158 } 167 }
159 // check if this couple is not already ini 168 // check if this couple is not already initialized
160 G4bool isnew = true; 169 G4bool isnew = true;
161 if(0 < n) { 170 if(0 < n) {
162 for(std::size_t i=0; i<n; ++i) { << 171 for(size_t i=0; i<n; ++i) {
163 G4cout << i << G4endl; <<
164 if(cutCouple == fMaterialCutsCoupleVec 172 if(cutCouple == fMaterialCutsCoupleVector[i]) {
165 isnew = false; 173 isnew = false;
166 break; 174 break;
167 } 175 }
168 } 176 }
169 } 177 }
170 // initialise data banks 178 // initialise data banks
171 // G4cout << " isNew: " << isnew << " " << 179 //G4cout << " isNew: " << isnew << " " << cutCouple << G4endl;
172 if(isnew) { 180 if(isnew) {
173 fMaterialCutsCoupleVector.push_back(cutC 181 fMaterialCutsCoupleVector.push_back(cutCouple);
174 fModelData->Initialise(cutCouple, this); 182 fModelData->Initialise(cutCouple, this);
175 } 183 }
176 } 184 }
177 } 185 }
178 } 186 }
179 InitialiseElementSelectors(p, cuts); 187 InitialiseElementSelectors(p, cuts);
180 } 188 }
181 } 189 }
182 190
183 ////////////////////////////////////////////// 191 /////////////////////////////////////////////////////////////////////////
184 192
185 void G4PAIModel::InitialiseLocal(const G4Parti << 193 void G4PAIModel::InitialiseLocal(const G4ParticleDefinition* p,
186 G4VEmModel* masterModel) 194 G4VEmModel* masterModel)
187 { 195 {
>> 196 SetParticle(p);
188 fModelData = static_cast<G4PAIModel*>(master 197 fModelData = static_cast<G4PAIModel*>(masterModel)->GetPAIModelData();
189 fMaterialCutsCoupleVector = 198 fMaterialCutsCoupleVector =
190 static_cast<G4PAIModel*>(masterModel)->Get 199 static_cast<G4PAIModel*>(masterModel)->GetVectorOfCouples();
191 SetElementSelectors(masterModel->GetElementS 200 SetElementSelectors(masterModel->GetElementSelectors());
192 } 201 }
193 202
194 ////////////////////////////////////////////// 203 //////////////////////////////////////////////////////////////////////////////
195 204
196 G4double G4PAIModel::MinEnergyCut(const G4Part 205 G4double G4PAIModel::MinEnergyCut(const G4ParticleDefinition*,
197 const G4MaterialCutsCouple*) 206 const G4MaterialCutsCouple*)
198 { 207 {
199 return fLowestTcut; 208 return fLowestTcut;
200 } 209 }
201 210
202 ////////////////////////////////////////////// 211 //////////////////////////////////////////////////////////////////////////////
203 212
204 G4double G4PAIModel::ComputeDEDXPerVolume(cons 213 G4double G4PAIModel::ComputeDEDXPerVolume(const G4Material*,
205 const G4ParticleDefinition* p, 214 const G4ParticleDefinition* p,
206 G4double kineticEnergy, 215 G4double kineticEnergy,
207 G4double cutEnergy) 216 G4double cutEnergy)
208 { 217 {
>> 218 //G4cout << "===1=== " << CurrentCouple()
>> 219 // << " idx= " << CurrentCouple()->GetIndex()
>> 220 // << " " << fMaterialCutsCoupleVector[0]
>> 221 // << G4endl;
209 G4int coupleIndex = FindCoupleIndex(CurrentC 222 G4int coupleIndex = FindCoupleIndex(CurrentCouple());
>> 223 //G4cout << "===2=== " << coupleIndex << G4endl;
210 if(0 > coupleIndex) { return 0.0; } 224 if(0 > coupleIndex) { return 0.0; }
211 225
212 G4double cut = std::min(MaxSecondaryEnergy(p 226 G4double cut = std::min(MaxSecondaryEnergy(p, kineticEnergy), cutEnergy);
>> 227
213 G4double scaledTkin = kineticEnergy*fRatio; 228 G4double scaledTkin = kineticEnergy*fRatio;
214 G4double dedx = fChargeSquare*fModelData->DE << 229
215 return dedx; << 230 return fChargeSquare*fModelData->DEDXPerVolume(coupleIndex, scaledTkin,
>> 231 cut);
216 } 232 }
217 233
218 ////////////////////////////////////////////// 234 /////////////////////////////////////////////////////////////////////////
219 235
220 G4double G4PAIModel::CrossSectionPerVolume( co 236 G4double G4PAIModel::CrossSectionPerVolume( const G4Material*,
221 const G4ParticleDefinition* p, 237 const G4ParticleDefinition* p,
222 G4double kineticEnergy, 238 G4double kineticEnergy,
223 G4double cutEnergy, 239 G4double cutEnergy,
224 G4double maxEnergy ) 240 G4double maxEnergy )
225 { 241 {
>> 242 //G4cout << "===3=== " << CurrentCouple()
>> 243 // << " idx= " << CurrentCouple()->GetIndex()
>> 244 // << " " << fMaterialCutsCoupleVector[0]
>> 245 // << G4endl;
226 G4int coupleIndex = FindCoupleIndex(CurrentC 246 G4int coupleIndex = FindCoupleIndex(CurrentCouple());
>> 247 //G4cout << "===4=== " << coupleIndex << G4endl;
227 if(0 > coupleIndex) { return 0.0; } 248 if(0 > coupleIndex) { return 0.0; }
228 249
229 G4double tmax = std::min(MaxSecondaryEnergy( 250 G4double tmax = std::min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy);
230 if(tmax <= cutEnergy) { return 0.0; } 251 if(tmax <= cutEnergy) { return 0.0; }
231 252
232 G4double scaledTkin = kineticEnergy*fRatio; 253 G4double scaledTkin = kineticEnergy*fRatio;
233 G4double xs = fChargeSquare*fModelData->Cros << 254
234 scal << 255 return fChargeSquare*fModelData->CrossSectionPerVolume(coupleIndex,
235 return xs; << 256 scaledTkin,
>> 257 cutEnergy,
>> 258 tmax);
236 } 259 }
237 260
238 ////////////////////////////////////////////// 261 ///////////////////////////////////////////////////////////////////////////
239 // 262 //
240 // It is analog of PostStepDoIt in terms of se 263 // It is analog of PostStepDoIt in terms of secondary electron.
241 // 264 //
242 265
243 void G4PAIModel::SampleSecondaries(std::vector 266 void G4PAIModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
244 const G4MaterialCutsCouple* matCC, 267 const G4MaterialCutsCouple* matCC,
245 const G4DynamicParticle* dp, 268 const G4DynamicParticle* dp,
246 G4double tmin, 269 G4double tmin,
247 G4double maxEnergy) 270 G4double maxEnergy)
248 { 271 {
249 G4int coupleIndex = FindCoupleIndex(matCC); 272 G4int coupleIndex = FindCoupleIndex(matCC);
250 273
251 //G4cout << "G4PAIModel::SampleSecondaries: 274 //G4cout << "G4PAIModel::SampleSecondaries: coupleIndex= "<<coupleIndex<<G4endl;
252 if(0 > coupleIndex) { return; } 275 if(0 > coupleIndex) { return; }
253 276
254 SetParticle(dp->GetDefinition()); 277 SetParticle(dp->GetDefinition());
255 G4double kineticEnergy = dp->GetKineticEnerg 278 G4double kineticEnergy = dp->GetKineticEnergy();
256 279
257 G4double tmax = MaxSecondaryEnergy(fParticle 280 G4double tmax = MaxSecondaryEnergy(fParticle, kineticEnergy);
258 if(maxEnergy < tmax) { tmax = maxEnergy; } 281 if(maxEnergy < tmax) { tmax = maxEnergy; }
259 if(tmin >= tmax) { return; } 282 if(tmin >= tmax) { return; }
260 283
261 G4ThreeVector direction= dp->GetMomentumDire 284 G4ThreeVector direction= dp->GetMomentumDirection();
262 G4double scaledTkin = kineticEnergy*fRati 285 G4double scaledTkin = kineticEnergy*fRatio;
263 G4double totalEnergy = kineticEnergy + fMa 286 G4double totalEnergy = kineticEnergy + fMass;
264 G4double totalMomentum = sqrt(kineticEnergy* 287 G4double totalMomentum = sqrt(kineticEnergy*(totalEnergy+fMass));
265 288
266 G4double deltaTkin = 289 G4double deltaTkin =
267 fModelData->SamplePostStepTransfer(coupleI 290 fModelData->SamplePostStepTransfer(coupleIndex, scaledTkin, tmin, tmax);
268 291
269 //G4cout<<"G4PAIModel::SampleSecondaries; de 292 //G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV
270 // <<" keV "<< " Escaled(MeV)= " << scaledT 293 // <<" keV "<< " Escaled(MeV)= " << scaledTkin << G4endl;
271 294
272 if( !(deltaTkin <= 0.) && !(deltaTkin > 0)) 295 if( !(deltaTkin <= 0.) && !(deltaTkin > 0)) {
273 G4cout<<"G4PAIModel::SampleSecondaries; de 296 G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV
274 <<" keV "<< " Escaled(MeV)= " << scaledTki 297 <<" keV "<< " Escaled(MeV)= " << scaledTkin << G4endl;
275 return; 298 return;
276 } 299 }
277 if( deltaTkin <= 0.) { return; } 300 if( deltaTkin <= 0.) { return; }
278 301
279 if( deltaTkin > tmax) { deltaTkin = tmax; } 302 if( deltaTkin > tmax) { deltaTkin = tmax; }
280 303
281 const G4Element* anElement = SelectTargetAto << 304 const G4Element* anElement = SelectRandomAtom(matCC,fParticle,kineticEnergy);
282 << 305 G4int Z = G4lrint(anElement->GetZ());
283 <<
284 G4int Z = anElement->GetZasInt(); <<
285 306
286 auto deltaRay = new G4DynamicParticle(fElect << 307 G4DynamicParticle* deltaRay = new G4DynamicParticle(fElectron,
287 GetAngularDistribution()->SampleDirectio 308 GetAngularDistribution()->SampleDirection(dp, deltaTkin,
288 Z, matCC->GetMaterial()), 309 Z, matCC->GetMaterial()),
289 deltaTkin); 310 deltaTkin);
290 311
291 // primary change 312 // primary change
292 kineticEnergy -= deltaTkin; 313 kineticEnergy -= deltaTkin;
293 G4ThreeVector dir = totalMomentum*direction 314 G4ThreeVector dir = totalMomentum*direction - deltaRay->GetMomentum();
294 direction = dir.unit(); 315 direction = dir.unit();
295 fParticleChange->SetProposedKineticEnergy(ki 316 fParticleChange->SetProposedKineticEnergy(kineticEnergy);
296 fParticleChange->SetProposedMomentumDirectio 317 fParticleChange->SetProposedMomentumDirection(direction);
297 318
298 vdp->push_back(deltaRay); 319 vdp->push_back(deltaRay);
299 } 320 }
300 321
301 ////////////////////////////////////////////// 322 ///////////////////////////////////////////////////////////////////////
302 323
303 G4double G4PAIModel::SampleFluctuations(const << 324 G4double G4PAIModel::SampleFluctuations( const G4MaterialCutsCouple* matCC,
304 const << 325 const G4DynamicParticle* aParticle,
305 const << 326 G4double tmax, G4double step,
306 const G4double, << 327 G4double eloss)
307 const <<
308 const G4double eloss) <<
309 { 328 {
310 G4int coupleIndex = FindCoupleIndex(matCC); 329 G4int coupleIndex = FindCoupleIndex(matCC);
311 if(0 > coupleIndex) { return eloss; } 330 if(0 > coupleIndex) { return eloss; }
312 331
313 SetParticle(aParticle->GetDefinition()); 332 SetParticle(aParticle->GetDefinition());
314 333
315 /* 334 /*
316 G4cout << "G4PAIModel::SampleFluctuations st 335 G4cout << "G4PAIModel::SampleFluctuations step(mm)= "<< step/mm
317 << " Eloss(keV)= " << eloss/keV << " in " 336 << " Eloss(keV)= " << eloss/keV << " in "
318 << matCC->Getmaterial()->GetName() << G4end 337 << matCC->Getmaterial()->GetName() << G4endl;
319 */ 338 */
320 339
321 G4double Tkin = aParticle->GetKineticE 340 G4double Tkin = aParticle->GetKineticEnergy();
322 G4double scaledTkin = Tkin*fRatio; 341 G4double scaledTkin = Tkin*fRatio;
323 342
324 G4double loss = fModelData->SampleAlongStepT 343 G4double loss = fModelData->SampleAlongStepTransfer(coupleIndex, Tkin,
325 scaledTkin, tcut, << 344 scaledTkin, tmax,
326 step*fChargeSquare); 345 step*fChargeSquare);
327 346
328 // G4cout<<"PAIModel AlongStepLoss = "<<loss 347 // G4cout<<"PAIModel AlongStepLoss = "<<loss/keV<<" keV, on step = "
329 //<<step/mm<<" mm"<<G4endl; 348 //<<step/mm<<" mm"<<G4endl;
330 return loss; 349 return loss;
331 350
332 } 351 }
333 352
334 ////////////////////////////////////////////// 353 //////////////////////////////////////////////////////////////////////
335 // 354 //
336 // Returns the statistical estimation of the e 355 // Returns the statistical estimation of the energy loss distribution variance
337 // 356 //
338 357
339 358
340 G4double G4PAIModel::Dispersion( const G4Mater 359 G4double G4PAIModel::Dispersion( const G4Material* material,
341 const G4Dynam 360 const G4DynamicParticle* aParticle,
342 const G4double tcut, << 361 G4double tmax,
343 const G4double tmax, << 362 G4double step )
344 const G4double step ) <<
345 { 363 {
346 G4double particleMass = aParticle->GetMass( 364 G4double particleMass = aParticle->GetMass();
347 G4double electronDensity = material->GetElec 365 G4double electronDensity = material->GetElectronDensity();
348 G4double kineticEnergy = aParticle->GetKinet 366 G4double kineticEnergy = aParticle->GetKineticEnergy();
349 G4double q = aParticle->GetCharge()/eplus; 367 G4double q = aParticle->GetCharge()/eplus;
350 G4double etot = kineticEnergy + particleMass 368 G4double etot = kineticEnergy + particleMass;
351 G4double beta2 = kineticEnergy*(kineticEnerg 369 G4double beta2 = kineticEnergy*(kineticEnergy + 2.0*particleMass)/(etot*etot);
352 G4double siga = (tmax/beta2 - 0.5*tcut) * t << 370 G4double siga = (1.0/beta2 - 0.5) * twopi_mc2_rcl2 * tmax * step
353 * electronDensity * q * q; 371 * electronDensity * q * q;
354 372
355 return siga; 373 return siga;
356 } 374 }
357 375
358 ////////////////////////////////////////////// 376 /////////////////////////////////////////////////////////////////////
359 377
360 G4double G4PAIModel::MaxSecondaryEnergy( const 378 G4double G4PAIModel::MaxSecondaryEnergy( const G4ParticleDefinition* p,
361 G4double kinEnergy) 379 G4double kinEnergy)
362 { 380 {
363 SetParticle(p); 381 SetParticle(p);
364 G4double tmax = kinEnergy; 382 G4double tmax = kinEnergy;
365 if(p == fElectron) { tmax *= 0.5; } 383 if(p == fElectron) { tmax *= 0.5; }
366 else if(p != fPositron) { 384 else if(p != fPositron) {
367 G4double ratio= electron_mass_c2/fMass; 385 G4double ratio= electron_mass_c2/fMass;
368 G4double gamma= kinEnergy/fMass + 1.0; 386 G4double gamma= kinEnergy/fMass + 1.0;
369 tmax = 2.0*electron_mass_c2*(gamma*gamma - 387 tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
370 (1. + 2.0*gamma*ratio + rati 388 (1. + 2.0*gamma*ratio + ratio*ratio);
371 } 389 }
372 return tmax; 390 return tmax;
373 } 391 }
374 392
375 ////////////////////////////////////////////// 393 ///////////////////////////////////////////////////////////////
376 394
377 void G4PAIModel::DefineForRegion(const G4Regio 395 void G4PAIModel::DefineForRegion(const G4Region* r)
378 { 396 {
379 fPAIRegionVector.push_back(r); 397 fPAIRegionVector.push_back(r);
380 } 398 }
381 399
382 ////////////////////////////////////////////// 400 ///////////////////////////////////////////////////////////////
383 401
384 402