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25 // 25 //
26 // 26 //
27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class file 29 // GEANT4 Class file
30 // 30 //
31 // 31 //
32 // File name: G4MuPairProductionModel 32 // File name: G4MuPairProductionModel
33 // 33 //
34 // Author: Vladimir Ivanchenko on base 34 // Author: Vladimir Ivanchenko on base of Laszlo Urban code
35 // 35 //
36 // Creation date: 24.06.2002 36 // Creation date: 24.06.2002
37 // 37 //
38 // Modifications: 38 // Modifications:
39 // 39 //
40 // 04-12-02 Change G4DynamicParticle construct 40 // 04-12-02 Change G4DynamicParticle constructor in PostStep (V.Ivanchenko)
41 // 23-12-02 Change interface in order to move 41 // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
42 // 24-01-03 Fix for compounds (V.Ivanchenko) 42 // 24-01-03 Fix for compounds (V.Ivanchenko)
43 // 27-01-03 Make models region aware (V.Ivanch 43 // 27-01-03 Make models region aware (V.Ivanchenko)
44 // 13-02-03 Add model (V.Ivanchenko) 44 // 13-02-03 Add model (V.Ivanchenko)
45 // 06-06-03 Fix in cross section calculation f 45 // 06-06-03 Fix in cross section calculation for high energy (V.Ivanchenko)
46 // 20-10-03 2*xi in ComputeDDMicroscopicCrossS 46 // 20-10-03 2*xi in ComputeDDMicroscopicCrossSection (R.Kokoulin)
47 // 8 integration points in ComputeDMi 47 // 8 integration points in ComputeDMicroscopicCrossSection
48 // 12-01-04 Take min cut of e- and e+ not its 48 // 12-01-04 Take min cut of e- and e+ not its sum (V.Ivanchenko)
49 // 10-02-04 Update parameterisation using R.Ko 49 // 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko)
50 // 28-04-04 For complex materials repeat calcu 50 // 28-04-04 For complex materials repeat calculation of max energy for each
51 // material (V.Ivanchenko) 51 // material (V.Ivanchenko)
52 // 01-11-04 Fix bug inside ComputeDMicroscopic 52 // 01-11-04 Fix bug inside ComputeDMicroscopicCrossSection (R.Kokoulin)
53 // 08-04-05 Major optimisation of internal int 53 // 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
54 // 03-08-05 Add SetParticle method (V.Ivantche 54 // 03-08-05 Add SetParticle method (V.Ivantchenko)
55 // 23-10-05 Add protection in sampling of e+e- 55 // 23-10-05 Add protection in sampling of e+e- pair energy needed for
56 // low cuts (V.Ivantchenko) 56 // low cuts (V.Ivantchenko)
57 // 13-02-06 Add ComputeCrossSectionPerAtom (mm 57 // 13-02-06 Add ComputeCrossSectionPerAtom (mma)
58 // 24-04-07 Add protection in SelectRandomAtom 58 // 24-04-07 Add protection in SelectRandomAtom method (V.Ivantchenko)
59 // 12-05-06 Updated sampling (use cut) in Sele 59 // 12-05-06 Updated sampling (use cut) in SelectRandomAtom (A.Bogdanov)
60 // 11-10-07 Add ignoreCut flag (V.Ivanchenko) 60 // 11-10-07 Add ignoreCut flag (V.Ivanchenko)
61 61
62 // 62 //
63 // Class Description: 63 // Class Description:
64 // 64 //
65 // 65 //
66 // ------------------------------------------- 66 // -------------------------------------------------------------------
67 // 67 //
68 //....oooOO0OOooo........oooOO0OOooo........oo 68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
70 70
71 #include "G4MuPairProductionModel.hh" 71 #include "G4MuPairProductionModel.hh"
72 #include "G4PhysicalConstants.hh" 72 #include "G4PhysicalConstants.hh"
73 #include "G4SystemOfUnits.hh" 73 #include "G4SystemOfUnits.hh"
74 #include "G4EmParameters.hh" 74 #include "G4EmParameters.hh"
75 #include "G4Electron.hh" 75 #include "G4Electron.hh"
76 #include "G4Positron.hh" 76 #include "G4Positron.hh"
77 #include "G4MuonMinus.hh" 77 #include "G4MuonMinus.hh"
78 #include "G4MuonPlus.hh" 78 #include "G4MuonPlus.hh"
79 #include "Randomize.hh" 79 #include "Randomize.hh"
80 #include "G4Material.hh" 80 #include "G4Material.hh"
81 #include "G4Element.hh" 81 #include "G4Element.hh"
82 #include "G4ElementVector.hh" 82 #include "G4ElementVector.hh"
83 #include "G4ElementDataRegistry.hh" <<
84 #include "G4ProductionCutsTable.hh" 83 #include "G4ProductionCutsTable.hh"
85 #include "G4ParticleChangeForLoss.hh" 84 #include "G4ParticleChangeForLoss.hh"
86 #include "G4ModifiedMephi.hh" 85 #include "G4ModifiedMephi.hh"
87 #include "G4Log.hh" 86 #include "G4Log.hh"
88 #include "G4Exp.hh" 87 #include "G4Exp.hh"
89 #include "G4AutoLock.hh" <<
90 <<
91 #include <iostream> 88 #include <iostream>
92 #include <fstream> 89 #include <fstream>
93 90
94 //....oooOO0OOooo........oooOO0OOooo........oo 91 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
95 92
96 const G4int G4MuPairProductionModel::ZDATPAIR[ << 93 // static members
97 << 94 //
98 const G4double G4MuPairProductionModel::xgi[] << 95 static const G4double ak1 = 6.9;
99 0.0198550717512320, 0.1016667612931865, 0. << 96 static const G4double ak2 = 1.0;
100 0.5917173212478250, 0.7627662049581645, 0. << 97 static const G4int nzdat = 5;
101 }; << 98 static const G4int zdat[5] = {1, 4, 13, 29, 92};
102 99
103 const G4double G4MuPairProductionModel::wgi[] << 100 static const G4double xgi[] =
104 0.0506142681451880, 0.1111905172266870, 0. << 101 { 0.0198550717512320, 0.1016667612931865, 0.2372337950418355, 0.4082826787521750,
105 0.1813418916891810, 0.1568533229389435, 0. << 102 0.5917173212478250, 0.7627662049581645, 0.8983332387068135, 0.9801449282487680 };
106 }; <<
107 103
108 namespace << 104 static const G4double wgi[] =
109 { << 105 { 0.0506142681451880, 0.1111905172266870, 0.1568533229389435, 0.1813418916891810,
110 G4Mutex theMuPairMutex = G4MUTEX_INITIALIZER << 106 0.1813418916891810, 0.1568533229389435, 0.1111905172266870, 0.0506142681451880 };
111 <<
112 const G4double ak1 = 6.9; <<
113 const G4double ak2 = 1.0; <<
114 } <<
115 107
116 //....oooOO0OOooo........oooOO0OOooo........oo 108 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
117 109
>> 110 using namespace std;
>> 111
118 G4MuPairProductionModel::G4MuPairProductionMod 112 G4MuPairProductionModel::G4MuPairProductionModel(const G4ParticleDefinition* p,
119 113 const G4String& nam)
120 : G4VEmModel(nam), 114 : G4VEmModel(nam),
121 factorForCross(CLHEP::fine_structure_const*C << 115 particle(nullptr),
122 CLHEP::classic_electr_radius*CLHEP::class << 116 factorForCross(4.*fine_structure_const*fine_structure_const
123 4./(3.*CLHEP::pi)), << 117 *classic_electr_radius*classic_electr_radius/(3.*pi)),
124 sqrte(std::sqrt(G4Exp(1.))), << 118 sqrte(sqrt(G4Exp(1.))),
125 minPairEnergy(4.*CLHEP::electron_mass_c2), << 119 currentZ(0),
126 lowestKinEnergy(0.85*CLHEP::GeV) << 120 fParticleChange(nullptr),
>> 121 minPairEnergy(4.*electron_mass_c2),
>> 122 lowestKinEnergy(1.0*GeV),
>> 123 nYBinPerDecade(4),
>> 124 nbiny(1000),
>> 125 nbine(0),
>> 126 ymin(-5.),
>> 127 dy(0.005),
>> 128 fTableToFile(false)
127 { 129 {
128 nist = G4NistManager::Instance(); 130 nist = G4NistManager::Instance();
129 131
130 theElectron = G4Electron::Electron(); 132 theElectron = G4Electron::Electron();
131 thePositron = G4Positron::Positron(); 133 thePositron = G4Positron::Positron();
132 134
133 if(nullptr != p) { << 135 particleMass = lnZ = z13 = z23 = 0.;
>> 136
>> 137 // setup lowest limit dependent on particle mass
>> 138 if(p) {
134 SetParticle(p); 139 SetParticle(p);
135 lowestKinEnergy = std::max(lowestKinEnergy << 140 lowestKinEnergy = std::max(lowestKinEnergy,p->GetPDGMass()*8.0);
136 } 141 }
137 emin = lowestKinEnergy; 142 emin = lowestKinEnergy;
138 emax = emin*10000.; << 143 emax = 10.*TeV;
139 SetAngularDistribution(new G4ModifiedMephi() 144 SetAngularDistribution(new G4ModifiedMephi());
140 } 145 }
141 146
142 //....oooOO0OOooo........oooOO0OOooo........oo 147 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
143 148
>> 149 G4MuPairProductionModel::~G4MuPairProductionModel()
>> 150 {}
>> 151
>> 152 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 153
144 G4double G4MuPairProductionModel::MinPrimaryEn 154 G4double G4MuPairProductionModel::MinPrimaryEnergy(const G4Material*,
145 155 const G4ParticleDefinition*,
146 156 G4double cut)
147 { 157 {
148 return std::max(lowestKinEnergy, cut); << 158 return std::max(lowestKinEnergy,cut);
149 } 159 }
150 160
151 //....oooOO0OOooo........oooOO0OOooo........oo 161 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
152 162
153 void G4MuPairProductionModel::Initialise(const 163 void G4MuPairProductionModel::Initialise(const G4ParticleDefinition* p,
154 const 164 const G4DataVector& cuts)
155 { 165 {
156 SetParticle(p); 166 SetParticle(p);
157 << 167 if(!fParticleChange) { fParticleChange = GetParticleChangeForLoss(); }
158 if (nullptr == fParticleChange) { <<
159 fParticleChange = GetParticleChangeForLoss <<
160 <<
161 // define scale of internal table for each <<
162 if (0 == nbine) { <<
163 emin = std::max(lowestKinEnergy, LowEner <<
164 emax = std::max(HighEnergyLimit(), emin* <<
165 nbine = std::size_t(nYBinPerDecade*std:: <<
166 if(nbine < 3) { nbine = 3; } <<
167 <<
168 ymin = G4Log(minPairEnergy/emin); <<
169 dy = -ymin/G4double(nbiny); <<
170 } <<
171 if (p == particle) { <<
172 G4int pdg = std::abs(p->GetPDGEncoding() <<
173 if (pdg == 2212) { <<
174 dataName = "pEEPairProd"; <<
175 } else if (pdg == 321) { <<
176 dataName = "kaonEEPairProd"; <<
177 } else if (pdg == 211) { <<
178 dataName = "pionEEPairProd"; <<
179 } else if (pdg == 11) { <<
180 dataName = "eEEPairProd"; <<
181 } else if (pdg == 13) { <<
182 if (GetName() == "muToMuonPairProd") { <<
183 dataName = "muMuMuPairProd"; <<
184 } else { <<
185 dataName = "muEEPairProd"; <<
186 } <<
187 } <<
188 } <<
189 } <<
190 168
191 // for low-energy application this process s 169 // for low-energy application this process should not work
192 if(lowestKinEnergy >= HighEnergyLimit()) { r 170 if(lowestKinEnergy >= HighEnergyLimit()) { return; }
193 171
194 if (p == particle) { << 172 // define scale of internal table for each thread only once
195 fElementData = << 173 if(0 == nbine) {
196 G4ElementDataRegistry::Instance()->GetEl << 174 emin = std::max(lowestKinEnergy, LowEnergyLimit());
197 if (nullptr == fElementData) { << 175 emax = std::max(HighEnergyLimit(), emin*2);
198 G4AutoLock l(&theMuPairMutex); << 176 nbine = size_t(nYBinPerDecade*std::log10(emax/emin));
199 fElementData = << 177 if(nbine < 3) { nbine = 3; }
200 G4ElementDataRegistry::Instance()->GetElemen << 178
201 if (nullptr == fElementData) { << 179 ymin = G4Log(minPairEnergy/emin);
202 fElementData = new G4ElementData(NZDATPAIR); << 180 dy = -ymin/G4double(nbiny);
203 fElementData->SetName(dataName); << 181 }
204 } << 182
205 G4bool useDataFile = G4EmParameters::Ins << 183 if(IsMaster() && p == particle) {
206 if (useDataFile) { useDataFile = Retrie << 184 if(!fElementData) {
207 if (!useDataFile) { MakeSamplingTables() << 185 fElementData = new G4ElementData();
208 if (fTableToFile) { StoreTables(); } << 186 G4bool dataFile = G4EmParameters::Instance()->RetrieveMuDataFromFile();
209 l.unlock(); << 187 if(dataFile) { dataFile = RetrieveTables(); }
210 } << 188 if(!dataFile) { MakeSamplingTables(); }
211 if (IsMaster()) { << 189 if(fTableToFile) { StoreTables(); }
212 InitialiseElementSelectors(p, cuts); << 190 }
213 } << 191 InitialiseElementSelectors(p, cuts);
214 } 192 }
215 } 193 }
216 194
217 //....oooOO0OOooo........oooOO0OOooo........oo 195 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
218 196
219 void G4MuPairProductionModel::InitialiseLocal( 197 void G4MuPairProductionModel::InitialiseLocal(const G4ParticleDefinition* p,
220 198 G4VEmModel* masterModel)
221 { 199 {
222 if(p == particle && lowestKinEnergy < HighEn 200 if(p == particle && lowestKinEnergy < HighEnergyLimit()) {
223 SetElementSelectors(masterModel->GetElemen 201 SetElementSelectors(masterModel->GetElementSelectors());
>> 202 fElementData = masterModel->GetElementData();
224 } 203 }
225 } 204 }
226 205
227 //....oooOO0OOooo........oooOO0OOooo........oo 206 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
228 207
229 G4double G4MuPairProductionModel::ComputeDEDXP 208 G4double G4MuPairProductionModel::ComputeDEDXPerVolume(
230 209 const G4Material* material,
231 210 const G4ParticleDefinition*,
232 211 G4double kineticEnergy,
233 212 G4double cutEnergy)
234 { 213 {
235 G4double dedx = 0.0; 214 G4double dedx = 0.0;
236 if (cutEnergy <= minPairEnergy || kineticEne 215 if (cutEnergy <= minPairEnergy || kineticEnergy <= lowestKinEnergy)
237 { return dedx; } 216 { return dedx; }
238 217
239 const G4ElementVector* theElementVector = ma 218 const G4ElementVector* theElementVector = material->GetElementVector();
240 const G4double* theAtomicNumDensityVector = 219 const G4double* theAtomicNumDensityVector =
241 material->G 220 material->GetAtomicNumDensityVector();
242 221
243 // loop for elements in the material 222 // loop for elements in the material
244 for (std::size_t i=0; i<material->GetNumberO << 223 for (size_t i=0; i<material->GetNumberOfElements(); ++i) {
245 G4double Z = (*theElementVector)[i]->GetZ 224 G4double Z = (*theElementVector)[i]->GetZ();
246 G4double tmax = MaxSecondaryEnergyForElem 225 G4double tmax = MaxSecondaryEnergyForElement(kineticEnergy, Z);
247 G4double loss = ComputMuPairLoss(Z, kinet 226 G4double loss = ComputMuPairLoss(Z, kineticEnergy, cutEnergy, tmax);
248 dedx += loss*theAtomicNumDensityVector[i] 227 dedx += loss*theAtomicNumDensityVector[i];
249 } 228 }
250 dedx = std::max(dedx, 0.0); 229 dedx = std::max(dedx, 0.0);
251 return dedx; 230 return dedx;
252 } 231 }
253 232
254 //....oooOO0OOooo........oooOO0OOooo........oo 233 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
255 234
256 G4double G4MuPairProductionModel::ComputMuPair 235 G4double G4MuPairProductionModel::ComputMuPairLoss(G4double Z,
257 236 G4double tkin,
258 237 G4double cutEnergy,
259 238 G4double tmax)
260 { 239 {
261 G4double loss = 0.0; 240 G4double loss = 0.0;
262 241
263 G4double cut = std::min(cutEnergy, tmax); << 242 G4double cut = std::min(cutEnergy,tmax);
264 if(cut <= minPairEnergy) { return loss; } 243 if(cut <= minPairEnergy) { return loss; }
265 244
266 // calculate the rectricted loss 245 // calculate the rectricted loss
267 // numerical integration in log(PairEnergy) 246 // numerical integration in log(PairEnergy)
268 G4double aaa = G4Log(minPairEnergy); 247 G4double aaa = G4Log(minPairEnergy);
269 G4double bbb = G4Log(cut); 248 G4double bbb = G4Log(cut);
270 249
271 G4int kkk = std::min(std::max(G4lrint((bbb-a << 250 G4int kkk = (G4int)((bbb-aaa)/ak1+ak2);
272 G4double hhh = (bbb-aaa)/kkk; << 251 if (kkk > 8) { kkk = 8; }
>> 252 else if (kkk < 1) { kkk = 1; }
>> 253
>> 254 G4double hhh = (bbb-aaa)/(G4double)kkk;
273 G4double x = aaa; 255 G4double x = aaa;
274 256
275 for (G4int l=0 ; l<kkk; ++l) { 257 for (G4int l=0 ; l<kkk; ++l) {
276 for (G4int ll=0; ll<NINTPAIR; ++ll) { << 258 for (G4int ll=0; ll<8; ++ll)
>> 259 {
277 G4double ep = G4Exp(x+xgi[ll]*hhh); 260 G4double ep = G4Exp(x+xgi[ll]*hhh);
278 loss += wgi[ll]*ep*ep*ComputeDMicroscopi 261 loss += wgi[ll]*ep*ep*ComputeDMicroscopicCrossSection(tkin, Z, ep);
279 } 262 }
280 x += hhh; 263 x += hhh;
281 } 264 }
282 loss *= hhh; 265 loss *= hhh;
283 loss = std::max(loss, 0.0); 266 loss = std::max(loss, 0.0);
284 return loss; 267 return loss;
285 } 268 }
286 269
287 //....oooOO0OOooo........oooOO0OOooo........oo 270 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
288 271
289 G4double G4MuPairProductionModel::ComputeMicro 272 G4double G4MuPairProductionModel::ComputeMicroscopicCrossSection(
290 G4d 273 G4double tkin,
291 G4d 274 G4double Z,
292 G4d 275 G4double cutEnergy)
293 { 276 {
294 G4double cross = 0.; 277 G4double cross = 0.;
295 G4double tmax = MaxSecondaryEnergyForElement 278 G4double tmax = MaxSecondaryEnergyForElement(tkin, Z);
296 G4double cut = std::max(cutEnergy, minPairE 279 G4double cut = std::max(cutEnergy, minPairEnergy);
297 if (tmax <= cut) { return cross; } 280 if (tmax <= cut) { return cross; }
298 281
>> 282 // G4double ak1=6.9 ;
>> 283 // G4double ak2=1.0 ;
299 G4double aaa = G4Log(cut); 284 G4double aaa = G4Log(cut);
300 G4double bbb = G4Log(tmax); 285 G4double bbb = G4Log(tmax);
301 G4int kkk = std::min(std::max(G4lrint((bbb-a << 286 G4int kkk = (G4int)((bbb-aaa)/ak1 + ak2);
>> 287 if(kkk > 8) { kkk = 8; }
>> 288 else if (kkk < 1) { kkk = 1; }
302 289
303 G4double hhh = (bbb-aaa)/(kkk); << 290 G4double hhh = (bbb-aaa)/G4double(kkk);
304 G4double x = aaa; 291 G4double x = aaa;
305 292
306 for (G4int l=0; l<kkk; ++l) { << 293 for(G4int l=0; l<kkk; ++l)
307 for (G4int i=0; i<NINTPAIR; ++i) { << 294 {
>> 295 for(G4int i=0; i<8; ++i)
>> 296 {
308 G4double ep = G4Exp(x + xgi[i]*hhh); 297 G4double ep = G4Exp(x + xgi[i]*hhh);
309 cross += ep*wgi[i]*ComputeDMicroscopicCr 298 cross += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
310 } 299 }
311 x += hhh; 300 x += hhh;
312 } 301 }
313 302
314 cross *= hhh; 303 cross *= hhh;
315 cross = std::max(cross, 0.0); 304 cross = std::max(cross, 0.0);
316 return cross; 305 return cross;
317 } 306 }
318 307
319 //....oooOO0OOooo........oooOO0OOooo........oo 308 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
320 309
321 G4double G4MuPairProductionModel::ComputeDMicr 310 G4double G4MuPairProductionModel::ComputeDMicroscopicCrossSection(
322 G4d 311 G4double tkin,
323 G4d 312 G4double Z,
324 G4d 313 G4double pairEnergy)
325 // Calculates the differential (D) microscopi 314 // Calculates the differential (D) microscopic cross section
326 // using the cross section formula of R.P. Kok 315 // using the cross section formula of R.P. Kokoulin (18/01/98)
327 // Code modified by R.P. Kokoulin, V.N. Ivanch 316 // Code modified by R.P. Kokoulin, V.N. Ivanchenko (27/01/04)
328 { 317 {
329 static const G4double bbbtf= 183. ; 318 static const G4double bbbtf= 183. ;
330 static const G4double bbbh = 202.4 ; 319 static const G4double bbbh = 202.4 ;
331 static const G4double g1tf = 1.95e-5 ; 320 static const G4double g1tf = 1.95e-5 ;
332 static const G4double g2tf = 5.3e-5 ; 321 static const G4double g2tf = 5.3e-5 ;
333 static const G4double g1h = 4.4e-5 ; 322 static const G4double g1h = 4.4e-5 ;
334 static const G4double g2h = 4.8e-5 ; 323 static const G4double g2h = 4.8e-5 ;
335 324
336 if (pairEnergy <= minPairEnergy) << 325 if (pairEnergy <= 4.0 * electron_mass_c2)
337 return 0.0; 326 return 0.0;
338 327
339 G4double totalEnergy = tkin + particleMass; 328 G4double totalEnergy = tkin + particleMass;
340 G4double residEnergy = totalEnergy - pairEn 329 G4double residEnergy = totalEnergy - pairEnergy;
341 330
342 if (residEnergy <= 0.75*sqrte*z13*particleMa 331 if (residEnergy <= 0.75*sqrte*z13*particleMass)
343 return 0.0; 332 return 0.0;
344 333
345 G4double a0 = 1.0 / (totalEnergy * residEner 334 G4double a0 = 1.0 / (totalEnergy * residEnergy);
346 G4double alf = 4.0 * electron_mass_c2 / pair 335 G4double alf = 4.0 * electron_mass_c2 / pairEnergy;
347 G4double rt = std::sqrt(1.0 - alf); << 336 G4double rt = sqrt(1.0 - alf);
348 G4double delta = 6.0 * particleMass * partic 337 G4double delta = 6.0 * particleMass * particleMass * a0;
349 G4double tmnexp = alf/(1.0 + rt) + delta*rt; 338 G4double tmnexp = alf/(1.0 + rt) + delta*rt;
350 339
351 if(tmnexp >= 1.0) { return 0.0; } 340 if(tmnexp >= 1.0) { return 0.0; }
352 341
353 G4double tmn = G4Log(tmnexp); 342 G4double tmn = G4Log(tmnexp);
354 343
355 G4double massratio = particleMass/CLHEP::ele << 344 G4double massratio = particleMass/electron_mass_c2;
356 G4double massratio2 = massratio*massratio; << 345 G4double massratio2 = massratio*massratio;
357 G4double inv_massratio2 = 1.0 / massratio2; 346 G4double inv_massratio2 = 1.0 / massratio2;
358 347
359 // zeta calculation 348 // zeta calculation
360 G4double bbb,g1,g2; 349 G4double bbb,g1,g2;
361 if( Z < 1.5 ) { bbb = bbbh ; g1 = g1h ; g2 = 350 if( Z < 1.5 ) { bbb = bbbh ; g1 = g1h ; g2 = g2h ; }
362 else { bbb = bbbtf; g1 = g1tf; g2 = 351 else { bbb = bbbtf; g1 = g1tf; g2 = g2tf; }
363 352
364 G4double zeta = 0.0; 353 G4double zeta = 0.0;
365 G4double z1exp = totalEnergy / (particleMass 354 G4double z1exp = totalEnergy / (particleMass + g1*z23*totalEnergy);
366 355
367 // 35.221047195922 is the root of zeta1(x) = 356 // 35.221047195922 is the root of zeta1(x) = 0.073 * log(x) - 0.26, so the
368 // condition below is the same as zeta1 > 0. 357 // condition below is the same as zeta1 > 0.0, but without calling log(x)
369 if (z1exp > 35.221047195922) 358 if (z1exp > 35.221047195922)
370 { 359 {
371 G4double z2exp = totalEnergy / (particleMa 360 G4double z2exp = totalEnergy / (particleMass + g2*z13*totalEnergy);
372 zeta = (0.073 * G4Log(z1exp) - 0.26) / (0. 361 zeta = (0.073 * G4Log(z1exp) - 0.26) / (0.058 * G4Log(z2exp) - 0.14);
373 } 362 }
374 363
375 G4double z2 = Z*(Z+zeta); 364 G4double z2 = Z*(Z+zeta);
376 G4double screen0 = 2.*electron_mass_c2*sqrte 365 G4double screen0 = 2.*electron_mass_c2*sqrte*bbb/(z13*pairEnergy);
377 G4double beta = 0.5*pairEnergy*pairEnergy*a0 366 G4double beta = 0.5*pairEnergy*pairEnergy*a0;
378 G4double xi0 = 0.5*massratio2*beta; 367 G4double xi0 = 0.5*massratio2*beta;
379 368
380 // Gaussian integration in ln(1-ro) ( with 8 369 // Gaussian integration in ln(1-ro) ( with 8 points)
381 G4double rho[NINTPAIR]; << 370 G4double rho[8];
382 G4double rho2[NINTPAIR]; << 371 G4double rho2[8];
383 G4double xi[NINTPAIR]; << 372 G4double xi[8];
384 G4double xi1[NINTPAIR]; << 373 G4double xi1[8];
385 G4double xii[NINTPAIR]; << 374 G4double xii[8];
386 375
387 for (G4int i = 0; i < NINTPAIR; ++i) << 376 for (G4int i = 0; i < 8; ++i)
388 { 377 {
389 rho[i] = G4Exp(tmn*xgi[i]) - 1.0; // rho = 378 rho[i] = G4Exp(tmn*xgi[i]) - 1.0; // rho = -asymmetry
390 rho2[i] = rho[i] * rho[i]; 379 rho2[i] = rho[i] * rho[i];
391 xi[i] = xi0*(1.0-rho2[i]); 380 xi[i] = xi0*(1.0-rho2[i]);
392 xi1[i] = 1.0 + xi[i]; 381 xi1[i] = 1.0 + xi[i];
393 xii[i] = 1.0 / xi[i]; 382 xii[i] = 1.0 / xi[i];
394 } 383 }
395 384
396 G4double ye1[NINTPAIR]; << 385 G4double ye1[8];
397 G4double ym1[NINTPAIR]; << 386 G4double ym1[8];
398 387
399 G4double b40 = 4.0 * beta; 388 G4double b40 = 4.0 * beta;
400 G4double b62 = 6.0 * beta + 2.0; 389 G4double b62 = 6.0 * beta + 2.0;
401 390
402 for (G4int i = 0; i < NINTPAIR; ++i) << 391 for (G4int i = 0; i < 8; ++i)
403 { 392 {
404 G4double yeu = (b40 + 5.0) + (b40 - 1.0) * 393 G4double yeu = (b40 + 5.0) + (b40 - 1.0) * rho2[i];
405 G4double yed = b62*G4Log(3.0 + xii[i]) + ( << 394 G4double yed = b62 * G4Log(3.0 + xii[i]) + (2.0 * beta - 1.0) * rho2[i] - b40;
406 395
407 G4double ymu = b62 * (1.0 + rho2[i]) + 6.0 396 G4double ymu = b62 * (1.0 + rho2[i]) + 6.0;
408 G4double ymd = (b40 + 3.0)*(1.0 + rho2[i]) << 397 G4double ymd = (b40 + 3.0) * (1.0 + rho2[i]) * G4Log(3.0 + xi[i]) + 2.0 - 3.0 * rho2[i];
409 + 2.0 - 3.0 * rho2[i]; <<
410 398
411 ye1[i] = 1.0 + yeu / yed; 399 ye1[i] = 1.0 + yeu / yed;
412 ym1[i] = 1.0 + ymu / ymd; 400 ym1[i] = 1.0 + ymu / ymd;
413 } 401 }
414 402
415 G4double be[NINTPAIR]; << 403 G4double be[8];
416 G4double bm[NINTPAIR]; << 404 G4double bm[8];
417 405
418 for(G4int i = 0; i < NINTPAIR; ++i) { << 406 for(G4int i = 0; i < 8; ++i)
>> 407 {
419 if(xi[i] <= 1000.0) { 408 if(xi[i] <= 1000.0) {
420 be[i] = ((2.0 + rho2[i])*(1.0 + beta) + << 409 be[i] = ((2.0 + rho2[i]) * (1.0 + beta) + xi[i] * (3.0 + rho2[i])) *
421 xi[i]*(3.0 + rho2[i]))*G4Log(1.0 + xi << 410 G4Log(1.0 + xii[i]) + (1.0 - rho2[i] - beta) / xi1[i] - (3.0 + rho2[i]);
422 (1.0 - rho2[i] - beta)/xi1[i] - (3.0 + rho2[ <<
423 } else { 411 } else {
424 be[i] = 0.5*(3.0 - rho2[i] + 2.0*beta*(1 << 412 be[i] = 0.5 * (3.0 - rho2[i] + 2.0 * beta * (1.0 + rho2[i])) * xii[i];
425 } 413 }
426 414
427 if(xi[i] >= 0.001) { 415 if(xi[i] >= 0.001) {
428 G4double a10 = (1.0 + 2.0 * beta) * (1.0 416 G4double a10 = (1.0 + 2.0 * beta) * (1.0 - rho2[i]);
429 bm[i] = ((1.0 + rho2[i])*(1.0 + 1.5 * be << 417 bm[i] = ((1.0 + rho2[i]) * (1.0 + 1.5 * beta) - a10 * xii[i]) * G4Log(xi1[i]) +
430 xi[i] * (1.0 - rho2[i] - beta) << 418 xi[i] * (1.0 - rho2[i] - beta) / xi1[i] + a10;
431 } else { 419 } else {
432 bm[i] = 0.5*(5.0 - rho2[i] + beta * (3.0 << 420 bm[i] = 0.5 * (5.0 - rho2[i] + beta * (3.0 + rho2[i])) * xi[i];
433 } 421 }
434 } 422 }
435 423
436 G4double sum = 0.0; 424 G4double sum = 0.0;
437 425
438 for (G4int i = 0; i < NINTPAIR; ++i) { << 426 for (G4int i = 0; i < 8; ++i)
439 G4double screen = screen0*xi1[i]/(1.0 - rh << 427 {
440 G4double ale = G4Log(bbb/z13*std::sqrt(xi1 << 428 G4double screen = screen0*xi1[i]/(1.0-rho2[i]) ;
441 G4double cre = 0.5*G4Log(1. + 2.25*z23*xi1 << 429 G4double ale = G4Log(bbb/z13*sqrt(xi1[i]*ye1[i])/(1.+screen*ye1[i])) ;
>> 430 G4double cre = 0.5*G4Log(1.+2.25*z23*xi1[i]*ye1[i]*inv_massratio2) ;
442 431
443 G4double fe = (ale-cre)*be[i]; 432 G4double fe = (ale-cre)*be[i];
444 fe = std::max(fe, 0.0); << 433 fe *= (fe > 0.0);
445 434
446 G4double alm_crm = G4Log(bbb*massratio/(1. << 435 G4double alm_crm = G4Log(bbb*massratio/(1.5*z23*(1.+screen*ym1[i])));
447 G4double fm = std::max(alm_crm*bm[i], 0.0) << 436 G4double fm = alm_crm*bm[i];
>> 437 fm *= (fm > 0.0) * inv_massratio2;
448 438
449 sum += wgi[i]*(1.0 + rho[i])*(fe + fm); << 439 sum += wgi[i]*(1.0 + rho[i])*(fe+fm);
450 } 440 }
451 441
452 return -tmn*sum*factorForCross*z2*residEnerg 442 return -tmn*sum*factorForCross*z2*residEnergy/(totalEnergy*pairEnergy);
453 } 443 }
454 444
455 //....oooOO0OOooo........oooOO0OOooo........oo 445 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
456 446
457 G4double G4MuPairProductionModel::ComputeCross 447 G4double G4MuPairProductionModel::ComputeCrossSectionPerAtom(
458 con 448 const G4ParticleDefinition*,
459 449 G4double kineticEnergy,
460 450 G4double Z, G4double,
461 451 G4double cutEnergy,
462 452 G4double maxEnergy)
463 { 453 {
464 G4double cross = 0.0; 454 G4double cross = 0.0;
465 if (kineticEnergy <= lowestKinEnergy) { retu 455 if (kineticEnergy <= lowestKinEnergy) { return cross; }
466 456
467 G4double maxPairEnergy = MaxSecondaryEnergyF 457 G4double maxPairEnergy = MaxSecondaryEnergyForElement(kineticEnergy, Z);
468 G4double tmax = std::min(maxEnergy, maxPairE 458 G4double tmax = std::min(maxEnergy, maxPairEnergy);
469 G4double cut = std::max(cutEnergy, minPairE 459 G4double cut = std::max(cutEnergy, minPairEnergy);
470 if (cut >= tmax) { return cross; } 460 if (cut >= tmax) { return cross; }
471 461
472 cross = ComputeMicroscopicCrossSection(kinet 462 cross = ComputeMicroscopicCrossSection(kineticEnergy, Z, cut);
473 if(tmax < kineticEnergy) { 463 if(tmax < kineticEnergy) {
474 cross -= ComputeMicroscopicCrossSection(ki 464 cross -= ComputeMicroscopicCrossSection(kineticEnergy, Z, tmax);
475 } 465 }
476 return cross; 466 return cross;
477 } 467 }
478 468
479 //....oooOO0OOooo........oooOO0OOooo........oo 469 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
480 470
481 void G4MuPairProductionModel::MakeSamplingTabl 471 void G4MuPairProductionModel::MakeSamplingTables()
482 { 472 {
483 G4double factore = G4Exp(G4Log(emax/emin)/G4 473 G4double factore = G4Exp(G4Log(emax/emin)/G4double(nbine));
484 474
485 for (G4int iz=0; iz<NZDATPAIR; ++iz) { << 475 for (G4int iz=0; iz<nzdat; ++iz) {
486 476
487 G4double Z = ZDATPAIR[iz]; << 477 G4double Z = zdat[iz];
488 G4Physics2DVector* pv = new G4Physics2DVec 478 G4Physics2DVector* pv = new G4Physics2DVector(nbiny+1,nbine+1);
489 G4double kinEnergy = emin; 479 G4double kinEnergy = emin;
490 480
491 for (std::size_t it=0; it<=nbine; ++it) { << 481 for (size_t it=0; it<=nbine; ++it) {
492 482
493 pv->PutY(it, G4Log(kinEnergy/CLHEP::MeV) << 483 pv->PutY(it, G4Log(kinEnergy/MeV));
494 G4double maxPairEnergy = MaxSecondaryEne 484 G4double maxPairEnergy = MaxSecondaryEnergyForElement(kinEnergy, Z);
495 /* 485 /*
496 G4cout << "it= " << it << " E= " << kinE 486 G4cout << "it= " << it << " E= " << kinEnergy
497 << " " << particle->GetParticleN 487 << " " << particle->GetParticleName()
498 << " maxE= " << maxPairEnergy << 488 << " maxE= " << maxPairEnergy << " minE= " << minPairEnergy
499 << " ymin= " << ymin << G4endl; 489 << " ymin= " << ymin << G4endl;
500 */ 490 */
501 G4double coef = G4Log(minPairEnergy/kinE 491 G4double coef = G4Log(minPairEnergy/kinEnergy)/ymin;
502 G4double ymax = G4Log(maxPairEnergy/kinE 492 G4double ymax = G4Log(maxPairEnergy/kinEnergy)/coef;
503 G4double fac = (ymax - ymin)/dy; 493 G4double fac = (ymax - ymin)/dy;
504 std::size_t imax = (std::size_t)fac; << 494 size_t imax = (size_t)fac;
505 fac -= (G4double)imax; 495 fac -= (G4double)imax;
506 496
507 G4double xSec = 0.0; 497 G4double xSec = 0.0;
508 G4double x = ymin; 498 G4double x = ymin;
509 /* 499 /*
510 G4cout << "Z= " << currentZ << " z13= " 500 G4cout << "Z= " << currentZ << " z13= " << z13
511 << " mE= " << maxPairEnergy << " 501 << " mE= " << maxPairEnergy << " ymin= " << ymin
512 << " dy= " << dy << " c= " << co 502 << " dy= " << dy << " c= " << coef << G4endl;
513 */ 503 */
514 // start from zero 504 // start from zero
515 pv->PutValue(0, it, 0.0); 505 pv->PutValue(0, it, 0.0);
516 if(0 == it) { pv->PutX(nbiny, 0.0); } 506 if(0 == it) { pv->PutX(nbiny, 0.0); }
517 507
518 for (std::size_t i=0; i<nbiny; ++i) { << 508 for (size_t i=0; i<nbiny; ++i) {
519 509
520 if(0 == it) { pv->PutX(i, x); } 510 if(0 == it) { pv->PutX(i, x); }
521 511
522 if(i < imax) { 512 if(i < imax) {
523 G4double ep = kinEnergy*G4Exp(coef*( 513 G4double ep = kinEnergy*G4Exp(coef*(x + dy*0.5));
524 514
525 // not multiplied by interval, becau 515 // not multiplied by interval, because table
526 // will be used only for sampling 516 // will be used only for sampling
527 //G4cout << "i= " << i << " x= " << 517 //G4cout << "i= " << i << " x= " << x << "E= " << kinEnergy
528 // << " Egamma= " << ep << G 518 // << " Egamma= " << ep << G4endl;
529 xSec += ep*ComputeDMicroscopicCrossS 519 xSec += ep*ComputeDMicroscopicCrossSection(kinEnergy, Z, ep);
530 520
531 // last bin before the kinematic lim 521 // last bin before the kinematic limit
532 } else if(i == imax) { 522 } else if(i == imax) {
533 G4double ep = kinEnergy*G4Exp(coef*( 523 G4double ep = kinEnergy*G4Exp(coef*(x + fac*dy*0.5));
534 xSec += ep*fac*ComputeDMicroscopicCr 524 xSec += ep*fac*ComputeDMicroscopicCrossSection(kinEnergy, Z, ep);
535 } 525 }
536 pv->PutValue(i + 1, it, xSec); 526 pv->PutValue(i + 1, it, xSec);
537 x += dy; 527 x += dy;
538 } 528 }
539 kinEnergy *= factore; 529 kinEnergy *= factore;
540 530
541 // to avoid precision lost 531 // to avoid precision lost
542 if(it+1 == nbine) { kinEnergy = emax; } 532 if(it+1 == nbine) { kinEnergy = emax; }
543 } 533 }
544 fElementData->InitialiseForElement(iz, pv) << 534 fElementData->InitialiseForElement(zdat[iz], pv);
545 } 535 }
546 } 536 }
547 537
548 //....oooOO0OOooo........oooOO0OOooo........oo 538 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
549 539
550 void G4MuPairProductionModel::SampleSecondarie 540 void G4MuPairProductionModel::SampleSecondaries(
551 std::vector<G4Dy 541 std::vector<G4DynamicParticle*>* vdp,
552 const G4Material 542 const G4MaterialCutsCouple* couple,
553 const G4DynamicP 543 const G4DynamicParticle* aDynamicParticle,
554 G4double tmin, 544 G4double tmin,
555 G4double tmax) 545 G4double tmax)
556 { 546 {
557 G4double kinEnergy = aDynamicParticle->GetKi 547 G4double kinEnergy = aDynamicParticle->GetKineticEnergy();
558 //G4cout << "------- G4MuPairProductionModel 548 //G4cout << "------- G4MuPairProductionModel::SampleSecondaries E(MeV)= "
559 // << kinEnergy << " " 549 // << kinEnergy << " "
560 // << aDynamicParticle->GetDefinitio 550 // << aDynamicParticle->GetDefinition()->GetParticleName() << G4endl;
561 G4double totalEnergy = kinEnergy + particl 551 G4double totalEnergy = kinEnergy + particleMass;
562 G4double totalMomentum = 552 G4double totalMomentum =
563 std::sqrt(kinEnergy*(kinEnergy + 2.0*parti << 553 sqrt(kinEnergy*(kinEnergy + 2.0*particleMass));
564 554
565 G4ThreeVector partDirection = aDynamicPartic 555 G4ThreeVector partDirection = aDynamicParticle->GetMomentumDirection();
566 556
567 // select randomly one element constituing t 557 // select randomly one element constituing the material
568 const G4Element* anElement = SelectRandomAto 558 const G4Element* anElement = SelectRandomAtom(couple,particle,kinEnergy);
569 559
570 // define interval of energy transfer 560 // define interval of energy transfer
571 G4double maxPairEnergy = MaxSecondaryEnergyF 561 G4double maxPairEnergy = MaxSecondaryEnergyForElement(kinEnergy,
572 562 anElement->GetZ());
573 G4double maxEnergy = std::min(tmax, maxPairE << 563 G4double maxEnergy = std::min(tmax, maxPairEnergy);
574 G4double minEnergy = std::max(tmin, minPairE << 564 G4double minEnergy = std::max(tmin, minPairEnergy);
575 565
576 if (minEnergy >= maxEnergy) { return; } << 566 if(minEnergy >= maxEnergy) { return; }
577 //G4cout << "emin= " << minEnergy << " emax= 567 //G4cout << "emin= " << minEnergy << " emax= " << maxEnergy
578 // << " minPair= " << minPairEnergy << " max 568 // << " minPair= " << minPairEnergy << " maxpair= " << maxPairEnergy
579 // << " ymin= " << ymin << " dy= " << dy 569 // << " ymin= " << ymin << " dy= " << dy << G4endl;
580 570
581 G4double coeff = G4Log(minPairEnergy/kinEner 571 G4double coeff = G4Log(minPairEnergy/kinEnergy)/ymin;
582 572
583 // compute limits 573 // compute limits
584 G4double yymin = G4Log(minEnergy/kinEnergy)/ 574 G4double yymin = G4Log(minEnergy/kinEnergy)/coeff;
585 G4double yymax = G4Log(maxEnergy/kinEnergy)/ 575 G4double yymax = G4Log(maxEnergy/kinEnergy)/coeff;
586 576
587 //G4cout << "yymin= " << yymin << " yymax= 577 //G4cout << "yymin= " << yymin << " yymax= " << yymax << G4endl;
588 578
589 // units should not be used, bacause table w 579 // units should not be used, bacause table was built without
590 G4double logTkin = G4Log(kinEnergy/CLHEP::Me << 580 G4double logTkin = G4Log(kinEnergy/MeV);
591 581
592 // sample e-e+ energy, pair energy first 582 // sample e-e+ energy, pair energy first
593 583
594 // select sample table via Z 584 // select sample table via Z
595 G4int iz1(0), iz2(0); 585 G4int iz1(0), iz2(0);
596 for (G4int iz=0; iz<NZDATPAIR; ++iz) { << 586 for(G4int iz=0; iz<nzdat; ++iz) {
597 if(currentZ == ZDATPAIR[iz]) { << 587 if(currentZ == zdat[iz]) {
598 iz1 = iz2 = iz; << 588 iz1 = iz2 = currentZ;
599 break; 589 break;
600 } else if(currentZ < ZDATPAIR[iz]) { << 590 } else if(currentZ < zdat[iz]) {
601 iz2 = iz; << 591 iz2 = zdat[iz];
602 if(iz > 0) { iz1 = iz-1; } << 592 if(iz > 0) { iz1 = zdat[iz-1]; }
603 else { iz1 = iz2; } 593 else { iz1 = iz2; }
604 break; 594 break;
605 } 595 }
606 } 596 }
607 if (0 == iz1) { iz1 = iz2 = NZDATPAIR-1; } << 597 if(0 == iz1) { iz1 = iz2 = zdat[nzdat-1]; }
608 598
609 G4double pairEnergy = 0.0; 599 G4double pairEnergy = 0.0;
610 G4int count = 0; 600 G4int count = 0;
611 //G4cout << "start loop Z1= " << iz1 << " Z2 601 //G4cout << "start loop Z1= " << iz1 << " Z2= " << iz2 << G4endl;
612 do { 602 do {
613 ++count; 603 ++count;
614 // sampling using only one random number 604 // sampling using only one random number
615 G4double rand = G4UniformRand(); 605 G4double rand = G4UniformRand();
616 606
617 G4double x = FindScaledEnergy(iz1, rand, l 607 G4double x = FindScaledEnergy(iz1, rand, logTkin, yymin, yymax);
618 if(iz1 != iz2) { 608 if(iz1 != iz2) {
619 G4double x2 = FindScaledEnergy(iz2, rand 609 G4double x2 = FindScaledEnergy(iz2, rand, logTkin, yymin, yymax);
620 G4double lz1= nist->GetLOGZ(ZDATPAIR[iz1 << 610 G4double lz1= nist->GetLOGZ(iz1);
621 G4double lz2= nist->GetLOGZ(ZDATPAIR[iz2 << 611 G4double lz2= nist->GetLOGZ(iz2);
622 //G4cout << count << ". x= " << x << " 612 //G4cout << count << ". x= " << x << " x2= " << x2
623 // << " Z1= " << iz1 << " Z2 613 // << " Z1= " << iz1 << " Z2= " << iz2 << G4endl;
624 x += (x2 - x)*(lnZ - lz1)/(lz2 - lz1); 614 x += (x2 - x)*(lnZ - lz1)/(lz2 - lz1);
625 } 615 }
626 //G4cout << "x= " << x << " coeff= " << c 616 //G4cout << "x= " << x << " coeff= " << coeff << G4endl;
627 pairEnergy = kinEnergy*G4Exp(x*coeff); 617 pairEnergy = kinEnergy*G4Exp(x*coeff);
628 618
629 // Loop checking, 03-Aug-2015, Vladimir Iv 619 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
630 } while((pairEnergy < minEnergy || pairEnerg 620 } while((pairEnergy < minEnergy || pairEnergy > maxEnergy) && 10 > count);
631 621
632 //G4cout << "## pairEnergy(GeV)= " << pairEn 622 //G4cout << "## pairEnergy(GeV)= " << pairEnergy/GeV
633 // << " Etot(GeV)= " << totalEnergy/ 623 // << " Etot(GeV)= " << totalEnergy/GeV << G4endl;
634 624
635 // sample r=(E+-E-)/pairEnergy ( uniformly 625 // sample r=(E+-E-)/pairEnergy ( uniformly .....)
636 G4double rmax = 626 G4double rmax =
637 (1.-6.*particleMass*particleMass/(totalEne 627 (1.-6.*particleMass*particleMass/(totalEnergy*(totalEnergy-pairEnergy)))
638 *std::sqrt(1.-minPairEnergy/pairEnergy); << 628 *sqrt(1.-minPairEnergy/pairEnergy);
639 G4double r = rmax * (-1.+2.*G4UniformRand()) 629 G4double r = rmax * (-1.+2.*G4UniformRand()) ;
640 630
641 // compute energies from pairEnergy,r 631 // compute energies from pairEnergy,r
642 G4double eEnergy = (1.-r)*pairEnergy*0.5; 632 G4double eEnergy = (1.-r)*pairEnergy*0.5;
643 G4double pEnergy = pairEnergy - eEnergy; 633 G4double pEnergy = pairEnergy - eEnergy;
644 634
645 // Sample angles 635 // Sample angles
646 G4ThreeVector eDirection, pDirection; 636 G4ThreeVector eDirection, pDirection;
647 // 637 //
648 GetAngularDistribution()->SamplePairDirectio 638 GetAngularDistribution()->SamplePairDirections(aDynamicParticle,
649 639 eEnergy, pEnergy,
650 640 eDirection, pDirection);
651 // create G4DynamicParticle object for e+e- 641 // create G4DynamicParticle object for e+e-
652 eEnergy = std::max(eEnergy - CLHEP::electron 642 eEnergy = std::max(eEnergy - CLHEP::electron_mass_c2, 0.0);
653 pEnergy = std::max(pEnergy - CLHEP::electron 643 pEnergy = std::max(pEnergy - CLHEP::electron_mass_c2, 0.0);
654 auto aParticle1 = new G4DynamicParticle(theE << 644 G4DynamicParticle* aParticle1 =
655 auto aParticle2 = new G4DynamicParticle(theP << 645 new G4DynamicParticle(theElectron,eDirection,eEnergy);
>> 646 G4DynamicParticle* aParticle2 =
>> 647 new G4DynamicParticle(thePositron,pDirection,pEnergy);
656 // Fill output vector 648 // Fill output vector
657 vdp->push_back(aParticle1); 649 vdp->push_back(aParticle1);
658 vdp->push_back(aParticle2); 650 vdp->push_back(aParticle2);
659 651
660 // primary change 652 // primary change
661 kinEnergy -= pairEnergy; 653 kinEnergy -= pairEnergy;
662 partDirection *= totalMomentum; 654 partDirection *= totalMomentum;
663 partDirection -= (aParticle1->GetMomentum() 655 partDirection -= (aParticle1->GetMomentum() + aParticle2->GetMomentum());
664 partDirection = partDirection.unit(); 656 partDirection = partDirection.unit();
665 657
666 // if energy transfer is higher than thresho 658 // if energy transfer is higher than threshold (very high by default)
667 // then stop tracking the primary particle a 659 // then stop tracking the primary particle and create a new secondary
668 if (pairEnergy > SecondaryThreshold()) { 660 if (pairEnergy > SecondaryThreshold()) {
669 fParticleChange->ProposeTrackStatus(fStopA 661 fParticleChange->ProposeTrackStatus(fStopAndKill);
670 fParticleChange->SetProposedKineticEnergy( 662 fParticleChange->SetProposedKineticEnergy(0.0);
671 auto newdp = new G4DynamicParticle(particl << 663 G4DynamicParticle* newdp =
>> 664 new G4DynamicParticle(particle, partDirection, kinEnergy);
672 vdp->push_back(newdp); 665 vdp->push_back(newdp);
673 } else { // continue tracking the primary e- 666 } else { // continue tracking the primary e-/e+ otherwise
674 fParticleChange->SetProposedMomentumDirect 667 fParticleChange->SetProposedMomentumDirection(partDirection);
675 fParticleChange->SetProposedKineticEnergy( 668 fParticleChange->SetProposedKineticEnergy(kinEnergy);
676 } 669 }
677 //G4cout << "-- G4MuPairProductionModel::Sam 670 //G4cout << "-- G4MuPairProductionModel::SampleSecondaries done" << G4endl;
678 } 671 }
679 672
680 //....oooOO0OOooo........oooOO0OOooo........oo 673 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
681 674
682 G4double <<
683 G4MuPairProductionModel::FindScaledEnergy(G4in <<
684 G4double logTkin, <<
685 G4double yymin, G4double yymax) <<
686 { <<
687 G4double res = yymin; <<
688 G4Physics2DVector* pv = fElementData->GetEle <<
689 if (nullptr != pv) { <<
690 G4double pmin = pv->Value(yymin, logTkin); <<
691 G4double pmax = pv->Value(yymax, logTkin); <<
692 G4double p0 = pv->Value(0.0, logTkin); <<
693 if(p0 <= 0.0) { DataCorrupted(ZDATPAIR[iz] <<
694 else { res = pv->FindLinearX((pmin + rand* <<
695 } else { <<
696 DataCorrupted(ZDATPAIR[iz], logTkin); <<
697 } <<
698 return res; <<
699 } <<
700 <<
701 //....oooOO0OOooo........oooOO0OOooo........oo <<
702 <<
703 void G4MuPairProductionModel::DataCorrupted(G4 675 void G4MuPairProductionModel::DataCorrupted(G4int Z, G4double logTkin) const
704 { 676 {
705 G4ExceptionDescription ed; 677 G4ExceptionDescription ed;
706 ed << "G4ElementData is not properly initial 678 ed << "G4ElementData is not properly initialized Z= " << Z
707 << " Ekin(MeV)= " << G4Exp(logTkin) 679 << " Ekin(MeV)= " << G4Exp(logTkin)
708 << " IsMasterThread= " << IsMaster() 680 << " IsMasterThread= " << IsMaster()
709 << " Model " << GetName(); 681 << " Model " << GetName();
710 G4Exception("G4MuPairProductionModel::()", " << 682 G4Exception("G4MuPairProductionModel::()","em0033",FatalException,
>> 683 ed,"");
711 } 684 }
712 685
713 //....oooOO0OOooo........oooOO0OOooo........oo 686 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
714 687
715 void G4MuPairProductionModel::StoreTables() co 688 void G4MuPairProductionModel::StoreTables() const
716 { 689 {
717 for (G4int iz=0; iz<NZDATPAIR; ++iz) { << 690 for (G4int iz=0; iz<nzdat; ++iz) {
718 G4int Z = ZDATPAIR[iz]; << 691 G4int Z = zdat[iz];
719 G4Physics2DVector* pv = fElementData->GetE 692 G4Physics2DVector* pv = fElementData->GetElement2DData(Z);
720 if(nullptr == pv) { << 693 if(!pv) {
721 DataCorrupted(Z, 1.0); 694 DataCorrupted(Z, 1.0);
722 return; 695 return;
723 } 696 }
724 std::ostringstream ss; 697 std::ostringstream ss;
725 ss << "mupair/" << particle->GetParticleNa 698 ss << "mupair/" << particle->GetParticleName() << Z << ".dat";
726 std::ofstream outfile(ss.str()); 699 std::ofstream outfile(ss.str());
727 pv->Store(outfile); 700 pv->Store(outfile);
728 } 701 }
729 } 702 }
730 703
731 //....oooOO0OOooo........oooOO0OOooo........oo 704 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
732 705
733 G4bool G4MuPairProductionModel::RetrieveTables 706 G4bool G4MuPairProductionModel::RetrieveTables()
734 { 707 {
735 for (G4int iz=0; iz<NZDATPAIR; ++iz) { << 708 char* path = std::getenv("G4LEDATA");
736 G4double Z = ZDATPAIR[iz]; << 709 G4String dir("");
>> 710 if (path) {
>> 711 std::ostringstream ost;
>> 712 ost << path << "/mupair/";
>> 713 dir = ost.str();
>> 714 } else {
>> 715 dir = "./mupair/";
>> 716 }
>> 717
>> 718 for (G4int iz=0; iz<nzdat; ++iz) {
>> 719 G4double Z = zdat[iz];
737 G4Physics2DVector* pv = new G4Physics2DVec 720 G4Physics2DVector* pv = new G4Physics2DVector(nbiny+1,nbine+1);
738 std::ostringstream ss; 721 std::ostringstream ss;
739 ss << G4EmParameters::Instance()->GetDirLE << 722 ss << dir << particle->GetParticleName() << Z << ".dat";
740 << particle->GetParticleName() << Z << <<
741 std::ifstream infile(ss.str(), std::ios::i 723 std::ifstream infile(ss.str(), std::ios::in);
742 if(!pv->Retrieve(infile)) { 724 if(!pv->Retrieve(infile)) {
743 delete pv; 725 delete pv;
744 return false; 726 return false;
745 } 727 }
746 fElementData->InitialiseForElement(iz, pv) << 728 fElementData->InitialiseForElement(Z, pv);
747 } 729 }
748 return true; 730 return true;
749 } 731 }
750 732
751 //....oooOO0OOooo........oooOO0OOooo........oo 733 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 734
>> 735
752 736