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25 // 22 //
>> 23 // $Id: G4MuPairProductionModel.cc,v 1.21 2004/12/02 08:20:38 vnivanch Exp $
>> 24 // GEANT4 tag $Name: geant4-07-00-cand-03 $
26 // 25 //
27 // ------------------------------------------- 26 // -------------------------------------------------------------------
28 // 27 //
29 // GEANT4 Class file 28 // GEANT4 Class file
30 // 29 //
31 // 30 //
32 // File name: G4MuPairProductionModel 31 // File name: G4MuPairProductionModel
33 // 32 //
34 // Author: Vladimir Ivanchenko on base 33 // Author: Vladimir Ivanchenko on base of Laszlo Urban code
35 // 34 //
36 // Creation date: 24.06.2002 35 // Creation date: 24.06.2002
37 // 36 //
38 // Modifications: 37 // Modifications:
39 // 38 //
40 // 04-12-02 Change G4DynamicParticle construct 39 // 04-12-02 Change G4DynamicParticle constructor in PostStep (V.Ivanchenko)
41 // 23-12-02 Change interface in order to move 40 // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
42 // 24-01-03 Fix for compounds (V.Ivanchenko) 41 // 24-01-03 Fix for compounds (V.Ivanchenko)
43 // 27-01-03 Make models region aware (V.Ivanch 42 // 27-01-03 Make models region aware (V.Ivanchenko)
44 // 13-02-03 Add model (V.Ivanchenko) 43 // 13-02-03 Add model (V.Ivanchenko)
45 // 06-06-03 Fix in cross section calculation f 44 // 06-06-03 Fix in cross section calculation for high energy (V.Ivanchenko)
46 // 20-10-03 2*xi in ComputeDDMicroscopicCrossS 45 // 20-10-03 2*xi in ComputeDDMicroscopicCrossSection (R.Kokoulin)
47 // 8 integration points in ComputeDMi 46 // 8 integration points in ComputeDMicroscopicCrossSection
48 // 12-01-04 Take min cut of e- and e+ not its 47 // 12-01-04 Take min cut of e- and e+ not its sum (V.Ivanchenko)
49 // 10-02-04 Update parameterisation using R.Ko 48 // 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko)
50 // 28-04-04 For complex materials repeat calcu 49 // 28-04-04 For complex materials repeat calculation of max energy for each
51 // material (V.Ivanchenko) 50 // material (V.Ivanchenko)
52 // 01-11-04 Fix bug inside ComputeDMicroscopic << 51 // 01-11-04 Fix bug in expression inside ComputeDMicroscopicCrossSection (R.Kokoulin)
53 // 08-04-05 Major optimisation of internal int <<
54 // 03-08-05 Add SetParticle method (V.Ivantche <<
55 // 23-10-05 Add protection in sampling of e+e- <<
56 // low cuts (V.Ivantchenko) <<
57 // 13-02-06 Add ComputeCrossSectionPerAtom (mm <<
58 // 24-04-07 Add protection in SelectRandomAtom <<
59 // 12-05-06 Updated sampling (use cut) in Sele <<
60 // 11-10-07 Add ignoreCut flag (V.Ivanchenko) <<
61 52
62 // 53 //
63 // Class Description: 54 // Class Description:
64 // 55 //
65 // 56 //
66 // ------------------------------------------- 57 // -------------------------------------------------------------------
67 // 58 //
68 //....oooOO0OOooo........oooOO0OOooo........oo 59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69 //....oooOO0OOooo........oooOO0OOooo........oo 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
70 61
71 #include "G4MuPairProductionModel.hh" 62 #include "G4MuPairProductionModel.hh"
72 #include "G4PhysicalConstants.hh" <<
73 #include "G4SystemOfUnits.hh" <<
74 #include "G4EmParameters.hh" <<
75 #include "G4Electron.hh" 63 #include "G4Electron.hh"
76 #include "G4Positron.hh" 64 #include "G4Positron.hh"
77 #include "G4MuonMinus.hh" 65 #include "G4MuonMinus.hh"
78 #include "G4MuonPlus.hh" 66 #include "G4MuonPlus.hh"
79 #include "Randomize.hh" 67 #include "Randomize.hh"
80 #include "G4Material.hh" 68 #include "G4Material.hh"
81 #include "G4Element.hh" 69 #include "G4Element.hh"
82 #include "G4ElementVector.hh" 70 #include "G4ElementVector.hh"
83 #include "G4ElementDataRegistry.hh" <<
84 #include "G4ProductionCutsTable.hh" 71 #include "G4ProductionCutsTable.hh"
85 #include "G4ParticleChangeForLoss.hh" <<
86 #include "G4ModifiedMephi.hh" <<
87 #include "G4Log.hh" <<
88 #include "G4Exp.hh" <<
89 #include "G4AutoLock.hh" <<
90 <<
91 #include <iostream> <<
92 #include <fstream> <<
93 72
94 //....oooOO0OOooo........oooOO0OOooo........oo 73 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
95 74
96 const G4int G4MuPairProductionModel::ZDATPAIR[ << 75 // static members
>> 76 //
>> 77 G4double G4MuPairProductionModel::zdat[]={1.,4.,13.,29.,92.};
>> 78 G4double G4MuPairProductionModel::adat[]={1.01,9.01,26.98,63.55,238.03};
>> 79 G4double G4MuPairProductionModel::tdat[]={1.e3,1.e4,1.e5,1.e6,1.e7,1.e8,1.e9,1.e10};
>> 80 G4double G4MuPairProductionModel::xgi[]={ 0.0199,0.1017,0.2372,0.4083,0.5917,0.7628,0.8983,0.9801 };
>> 81 G4double G4MuPairProductionModel::wgi[]={ 0.0506,0.1112,0.1569,0.1813,0.1813,0.1569,0.1112,0.0506 };
>> 82
>> 83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
97 84
98 const G4double G4MuPairProductionModel::xgi[] << 85 using namespace std;
99 0.0198550717512320, 0.1016667612931865, 0. <<
100 0.5917173212478250, 0.7627662049581645, 0. <<
101 }; <<
102 86
103 const G4double G4MuPairProductionModel::wgi[] << 87 G4MuPairProductionModel::G4MuPairProductionModel(const G4ParticleDefinition*,
104 0.0506142681451880, 0.1111905172266870, 0. << 88 const G4String& nam)
105 0.1813418916891810, 0.1568533229389435, 0. << 89 : G4VEmModel(nam),
106 }; << 90 minPairEnergy(4.*electron_mass_c2),
>> 91 highKinEnergy(1000000.*TeV),
>> 92 lowKinEnergy(minPairEnergy),
>> 93 lowestKinEnergy(1.*GeV),
>> 94 factorForCross(4.*fine_structure_const*fine_structure_const
>> 95 *classic_electr_radius*classic_electr_radius/(3.*pi)),
>> 96 sqrte(sqrt(exp(1.))),
>> 97 particleMass(G4MuonPlus::MuonPlus()->GetPDGMass()),
>> 98 currentZ(0),
>> 99 particle(G4MuonPlus::MuonPlus()),
>> 100 nzdat(5),
>> 101 ntdat(8),
>> 102 nbiny(1000),
>> 103 nmaxElements(0),
>> 104 ymin(-5.),
>> 105 ymax(0.),
>> 106 dy((ymax-ymin)/nbiny),
>> 107 samplingTablesAreFilled(false)
>> 108 {}
107 109
108 namespace << 110 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
109 { <<
110 G4Mutex theMuPairMutex = G4MUTEX_INITIALIZER <<
111 111
112 const G4double ak1 = 6.9; << 112 G4MuPairProductionModel::~G4MuPairProductionModel()
113 const G4double ak2 = 1.0; << 113 {}
114 } <<
115 114
116 //....oooOO0OOooo........oooOO0OOooo........oo 115 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
117 116
118 G4MuPairProductionModel::G4MuPairProductionMod << 117 G4double G4MuPairProductionModel::HighEnergyLimit(const G4ParticleDefinition*)
119 <<
120 : G4VEmModel(nam), <<
121 factorForCross(CLHEP::fine_structure_const*C <<
122 CLHEP::classic_electr_radius*CLHEP::class <<
123 4./(3.*CLHEP::pi)), <<
124 sqrte(std::sqrt(G4Exp(1.))), <<
125 minPairEnergy(4.*CLHEP::electron_mass_c2), <<
126 lowestKinEnergy(0.85*CLHEP::GeV) <<
127 { 118 {
128 nist = G4NistManager::Instance(); << 119 return highKinEnergy;
129 <<
130 theElectron = G4Electron::Electron(); <<
131 thePositron = G4Positron::Positron(); <<
132 <<
133 if(nullptr != p) { <<
134 SetParticle(p); <<
135 lowestKinEnergy = std::max(lowestKinEnergy <<
136 } <<
137 emin = lowestKinEnergy; <<
138 emax = emin*10000.; <<
139 SetAngularDistribution(new G4ModifiedMephi() <<
140 } 120 }
141 121
142 //....oooOO0OOooo........oooOO0OOooo........oo 122 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
143 123
144 G4double G4MuPairProductionModel::MinPrimaryEn << 124 G4double G4MuPairProductionModel::LowEnergyLimit(const G4ParticleDefinition*)
145 <<
146 <<
147 { 125 {
148 return std::max(lowestKinEnergy, cut); << 126 return lowKinEnergy;
149 } 127 }
150 128
151 //....oooOO0OOooo........oooOO0OOooo........oo 129 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
152 130
153 void G4MuPairProductionModel::Initialise(const << 131 G4double G4MuPairProductionModel::MinEnergyCut(const G4ParticleDefinition*,
154 const << 132 const G4MaterialCutsCouple* )
155 { << 133 {
156 SetParticle(p); << 134 return minPairEnergy;
157 << 135 }
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 } <<
190 136
191 // for low-energy application this process s << 137 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
192 if(lowestKinEnergy >= HighEnergyLimit()) { r <<
193 138
194 if (p == particle) { << 139 G4bool G4MuPairProductionModel::IsInCharge(const G4ParticleDefinition* p)
195 fElementData = << 140 {
196 G4ElementDataRegistry::Instance()->GetEl << 141 return (p == G4MuonMinus::MuonMinus() || p == G4MuonPlus::MuonPlus());
197 if (nullptr == fElementData) { <<
198 G4AutoLock l(&theMuPairMutex); <<
199 fElementData = <<
200 G4ElementDataRegistry::Instance()->GetElemen <<
201 if (nullptr == fElementData) { <<
202 fElementData = new G4ElementData(NZDATPAIR); <<
203 fElementData->SetName(dataName); <<
204 } <<
205 G4bool useDataFile = G4EmParameters::Ins <<
206 if (useDataFile) { useDataFile = Retrie <<
207 if (!useDataFile) { MakeSamplingTables() <<
208 if (fTableToFile) { StoreTables(); } <<
209 l.unlock(); <<
210 } <<
211 if (IsMaster()) { <<
212 InitialiseElementSelectors(p, cuts); <<
213 } <<
214 } <<
215 } 142 }
216 143
217 //....oooOO0OOooo........oooOO0OOooo........oo << 144 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
218 145
219 void G4MuPairProductionModel::InitialiseLocal( << 146 void G4MuPairProductionModel::Initialise(const G4ParticleDefinition*,
220 << 147 const G4DataVector&)
221 { << 148 {
222 if(p == particle && lowestKinEnergy < HighEn << 149 if (!samplingTablesAreFilled) MakeSamplingTables();
223 SetElementSelectors(masterModel->GetElemen <<
224 } <<
225 } 150 }
226 151
227 //....oooOO0OOooo........oooOO0OOooo........oo 152 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
228 153
229 G4double G4MuPairProductionModel::ComputeDEDXP << 154 G4double G4MuPairProductionModel::ComputeDEDX(const G4MaterialCutsCouple* couple,
230 <<
231 155 const G4ParticleDefinition*,
232 156 G4double kineticEnergy,
233 157 G4double cutEnergy)
234 { 158 {
235 G4double dedx = 0.0; 159 G4double dedx = 0.0;
236 if (cutEnergy <= minPairEnergy || kineticEne << 160 if (cutEnergy <= minPairEnergy || kineticEnergy <= lowestKinEnergy) return dedx;
237 { return dedx; } <<
238 161
>> 162 const G4Material* material = couple->GetMaterial();
239 const G4ElementVector* theElementVector = ma 163 const G4ElementVector* theElementVector = material->GetElementVector();
240 const G4double* theAtomicNumDensityVector = 164 const G4double* theAtomicNumDensityVector =
241 material->G 165 material->GetAtomicNumDensityVector();
242 166
243 // loop for elements in the material 167 // loop for elements in the material
244 for (std::size_t i=0; i<material->GetNumberO << 168 for (size_t i=0; i<material->GetNumberOfElements(); i++) {
245 G4double Z = (*theElementVector)[i]->GetZ 169 G4double Z = (*theElementVector)[i]->GetZ();
246 G4double tmax = MaxSecondaryEnergyForElem << 170 SetCurrentElement(Z);
247 G4double loss = ComputMuPairLoss(Z, kinet << 171 G4double tmax = MaxSecondaryEnergy(particle, kineticEnergy);
>> 172 G4double cut = min(cutEnergy,tmax);
>> 173 G4double loss = ComputMuPairLoss(Z, kineticEnergy, cut, tmax);
248 dedx += loss*theAtomicNumDensityVector[i] 174 dedx += loss*theAtomicNumDensityVector[i];
249 } 175 }
250 dedx = std::max(dedx, 0.0); << 176 if (dedx < 0.) dedx = 0.;
251 return dedx; 177 return dedx;
252 } 178 }
253 179
254 //....oooOO0OOooo........oooOO0OOooo........oo 180 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
255 181
256 G4double G4MuPairProductionModel::ComputMuPair << 182 G4double G4MuPairProductionModel::ComputMuPairLoss(G4double Z,
257 << 183 G4double tkin, G4double cutEnergy,
258 << 184 G4double tmax)
259 <<
260 { 185 {
>> 186 SetCurrentElement(Z);
261 G4double loss = 0.0; 187 G4double loss = 0.0;
262 188
263 G4double cut = std::min(cutEnergy, tmax); << 189 G4double cut = cutEnergy;
264 if(cut <= minPairEnergy) { return loss; } << 190 if(tmax <= cutEnergy || cut <= minPairEnergy) return loss;
265 191
266 // calculate the rectricted loss 192 // calculate the rectricted loss
267 // numerical integration in log(PairEnergy) 193 // numerical integration in log(PairEnergy)
268 G4double aaa = G4Log(minPairEnergy); << 194 G4double ak1=6.9;
269 G4double bbb = G4Log(cut); << 195 G4double ak2=1.0;
270 << 196 G4double aaa = log(minPairEnergy);
271 G4int kkk = std::min(std::max(G4lrint((bbb-a << 197 G4double bbb = log(cut);
272 G4double hhh = (bbb-aaa)/kkk; << 198 G4int kkk = (G4int)((bbb-aaa)/ak1+ak2);
>> 199 if (kkk > 8) kkk = 8;
>> 200 G4double hhh = (bbb-aaa)/(G4double)kkk;
273 G4double x = aaa; 201 G4double x = aaa;
274 202
275 for (G4int l=0 ; l<kkk; ++l) { << 203 for (G4int l=0 ; l<kkk; l++)
276 for (G4int ll=0; ll<NINTPAIR; ++ll) { << 204 {
277 G4double ep = G4Exp(x+xgi[ll]*hhh); << 205
>> 206 for (G4int ll=0; ll<8; ll++)
>> 207 {
>> 208 G4double ep = exp(x+xgi[ll]*hhh);
278 loss += wgi[ll]*ep*ep*ComputeDMicroscopi 209 loss += wgi[ll]*ep*ep*ComputeDMicroscopicCrossSection(tkin, Z, ep);
279 } 210 }
280 x += hhh; 211 x += hhh;
281 } 212 }
282 loss *= hhh; 213 loss *= hhh;
283 loss = std::max(loss, 0.0); << 214 if (loss < 0.) loss = 0.;
284 return loss; 215 return loss;
285 } 216 }
286 217
287 //....oooOO0OOooo........oooOO0OOooo........oo 218 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
288 219
289 G4double G4MuPairProductionModel::ComputeMicro 220 G4double G4MuPairProductionModel::ComputeMicroscopicCrossSection(
290 G4d 221 G4double tkin,
291 G4d 222 G4double Z,
292 G4d << 223 G4double cut)
>> 224
293 { 225 {
294 G4double cross = 0.; << 226 G4double cross = 0. ;
295 G4double tmax = MaxSecondaryEnergyForElement << 227
296 G4double cut = std::max(cutEnergy, minPairE << 228 SetCurrentElement(Z);
297 if (tmax <= cut) { return cross; } << 229 G4double tmax = MaxSecondaryEnergy(particle, tkin);
298 <<
299 G4double aaa = G4Log(cut); <<
300 G4double bbb = G4Log(tmax); <<
301 G4int kkk = std::min(std::max(G4lrint((bbb-a <<
302 230
303 G4double hhh = (bbb-aaa)/(kkk); << 231 if (tmax <= cut) return cross;
>> 232
>> 233 G4double ak1=6.9 ;
>> 234 G4double ak2=1.0 ;
>> 235 G4double aaa = log(cut);
>> 236 G4double bbb = log(tmax);
>> 237 G4int kkk = (G4int)((bbb-aaa)/ak1 + ak2);
>> 238 if(kkk > 8) kkk = 8;
>> 239 G4double hhh = (bbb-aaa)/float(kkk);
304 G4double x = aaa; 240 G4double x = aaa;
305 241
306 for (G4int l=0; l<kkk; ++l) { << 242 for(G4int l=0; l<kkk; l++)
307 for (G4int i=0; i<NINTPAIR; ++i) { << 243 {
308 G4double ep = G4Exp(x + xgi[i]*hhh); << 244 for(G4int i=0; i<8; i++)
>> 245 {
>> 246 G4double ep = exp(x + xgi[i]*hhh);
309 cross += ep*wgi[i]*ComputeDMicroscopicCr 247 cross += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
310 } 248 }
311 x += hhh; 249 x += hhh;
312 } 250 }
313 251
314 cross *= hhh; << 252 cross *=hhh;
315 cross = std::max(cross, 0.0); << 253 if(cross < 0.0) cross = 0.0;
316 return cross; 254 return cross;
317 } 255 }
318 256
319 //....oooOO0OOooo........oooOO0OOooo........oo <<
320 <<
321 G4double G4MuPairProductionModel::ComputeDMicr 257 G4double G4MuPairProductionModel::ComputeDMicroscopicCrossSection(
322 G4d 258 G4double tkin,
323 G4d 259 G4double Z,
324 G4d 260 G4double pairEnergy)
325 // Calculates the differential (D) microscopi << 261 // Calculates the differential (D) microscopic cross section
326 // using the cross section formula of R.P. Kok << 262 // using the cross section formula of R.P. Kokoulin (18/01/98)
327 // Code modified by R.P. Kokoulin, V.N. Ivanch << 263 // Code modified by R.P. Kokoulin, V.N. Ivanchenko (27/01/04)
328 { << 264 {
329 static const G4double bbbtf= 183. ; << 265 G4double bbbtf= 183. ;
330 static const G4double bbbh = 202.4 ; << 266 G4double bbbh = 202.4 ;
331 static const G4double g1tf = 1.95e-5 ; << 267 G4double g1tf = 1.95e-5 ;
332 static const G4double g2tf = 5.3e-5 ; << 268 G4double g2tf = 5.3e-5 ;
333 static const G4double g1h = 4.4e-5 ; << 269 G4double g1h = 4.4e-5 ;
334 static const G4double g2h = 4.8e-5 ; << 270 G4double g2h = 4.8e-5 ;
335 <<
336 if (pairEnergy <= minPairEnergy) <<
337 return 0.0; <<
338 271
339 G4double totalEnergy = tkin + particleMass; 272 G4double totalEnergy = tkin + particleMass;
340 G4double residEnergy = totalEnergy - pairEn 273 G4double residEnergy = totalEnergy - pairEnergy;
>> 274 G4double massratio = particleMass/electron_mass_c2 ;
>> 275 G4double massratio2 = massratio*massratio ;
>> 276 G4double cross = 0.;
341 277
342 if (residEnergy <= 0.75*sqrte*z13*particleMa << 278 SetCurrentElement(Z);
343 return 0.0; <<
344 279
345 G4double a0 = 1.0 / (totalEnergy * residEner << 280 G4double c3 = 0.75*sqrte*particleMass;
346 G4double alf = 4.0 * electron_mass_c2 / pair << 281 if (residEnergy <= c3*z13) return cross;
347 G4double rt = std::sqrt(1.0 - alf); << 282
348 G4double delta = 6.0 * particleMass * partic << 283 G4double c7 = 4.*electron_mass_c2;
349 G4double tmnexp = alf/(1.0 + rt) + delta*rt; << 284 G4double c8 = 6.*particleMass*particleMass;
350 << 285 G4double alf = c7/pairEnergy;
351 if(tmnexp >= 1.0) { return 0.0; } << 286 G4double a3 = 1. - alf;
352 << 287 if (a3 <= 0.) return cross;
353 G4double tmn = G4Log(tmnexp); <<
354 <<
355 G4double massratio = particleMass/CLHEP::ele <<
356 G4double massratio2 = massratio*massratio; <<
357 G4double inv_massratio2 = 1.0 / massratio2; <<
358 288
359 // zeta calculation 289 // zeta calculation
360 G4double bbb,g1,g2; 290 G4double bbb,g1,g2;
361 if( Z < 1.5 ) { bbb = bbbh ; g1 = g1h ; g2 = 291 if( Z < 1.5 ) { bbb = bbbh ; g1 = g1h ; g2 = g2h ; }
362 else { bbb = bbbtf; g1 = g1tf; g2 = 292 else { bbb = bbbtf; g1 = g1tf; g2 = g2tf; }
363 293
364 G4double zeta = 0.0; << 294 G4double zeta = 0;
365 G4double z1exp = totalEnergy / (particleMass << 295 G4double zeta1 = 0.073 * log(totalEnergy/(particleMass+g1*z23*totalEnergy))-0.26 ;
366 << 296 if ( zeta1 > 0.)
367 // 35.221047195922 is the root of zeta1(x) = <<
368 // condition below is the same as zeta1 > 0. <<
369 if (z1exp > 35.221047195922) <<
370 { 297 {
371 G4double z2exp = totalEnergy / (particleMa << 298 G4double zeta2 = 0.058*log(totalEnergy/(particleMass+g2*z13*totalEnergy))-0.14 ;
372 zeta = (0.073 * G4Log(z1exp) - 0.26) / (0. << 299 zeta = zeta1/zeta2 ;
373 } 300 }
374 301
375 G4double z2 = Z*(Z+zeta); 302 G4double z2 = Z*(Z+zeta);
376 G4double screen0 = 2.*electron_mass_c2*sqrte 303 G4double screen0 = 2.*electron_mass_c2*sqrte*bbb/(z13*pairEnergy);
377 G4double beta = 0.5*pairEnergy*pairEnergy*a0 << 304 G4double a0 = totalEnergy*residEnergy;
378 G4double xi0 = 0.5*massratio2*beta; << 305 G4double a1 = pairEnergy*pairEnergy/a0;
>> 306 G4double bet = 0.5*a1;
>> 307 G4double xi0 = 0.25*massratio2*a1;
>> 308 G4double del = c8/a0;
>> 309
>> 310 G4double rta3 = sqrt(a3);
>> 311 G4double tmnexp = alf/(1. + rta3) + del*rta3;
>> 312 if(tmnexp >= 1.0) return cross;
379 313
380 // Gaussian integration in ln(1-ro) ( with 8 << 314 G4double tmn = log(tmnexp);
381 G4double rho[NINTPAIR]; << 315 G4double sum = 0.;
382 G4double rho2[NINTPAIR]; <<
383 G4double xi[NINTPAIR]; <<
384 G4double xi1[NINTPAIR]; <<
385 G4double xii[NINTPAIR]; <<
386 316
387 for (G4int i = 0; i < NINTPAIR; ++i) << 317 // Gaussian integration in ln(1-ro) ( with 8 points)
>> 318 for (G4int i=0; i<8; i++)
388 { 319 {
389 rho[i] = G4Exp(tmn*xgi[i]) - 1.0; // rho = << 320 G4double a4 = exp(tmn*xgi[i]); // a4 = (1.-asymmetry)
390 rho2[i] = rho[i] * rho[i]; << 321 G4double a5 = a4*(2.-a4) ;
391 xi[i] = xi0*(1.0-rho2[i]); << 322 G4double a6 = 1.-a5 ;
392 xi1[i] = 1.0 + xi[i]; << 323 G4double a7 = 1.+a6 ;
393 xii[i] = 1.0 / xi[i]; << 324 G4double a9 = 3.+a6 ;
>> 325 G4double xi = xi0*a5 ;
>> 326 G4double xii = 1./xi ;
>> 327 G4double xi1 = 1.+xi ;
>> 328 G4double screen = screen0*xi1/a5 ;
>> 329 G4double yeu = 5.-a6+4.*bet*a7 ;
>> 330 G4double yed = 2.*(1.+3.*bet)*log(3.+xii)-a6-a1*(2.-a6) ;
>> 331 G4double ye1 = 1.+yeu/yed ;
>> 332 G4double ale=log(bbb/z13*sqrt(xi1*ye1)/(1.+screen*ye1)) ;
>> 333 G4double cre = 0.5*log(1.+2.25*z23*xi1*ye1/massratio2) ;
>> 334 G4double be;
>> 335
>> 336 if (xi <= 1.e3) be = ((2.+a6)*(1.+bet)+xi*a9)*log(1.+xii)+(a5-bet)/xi1-a9;
>> 337 else be = (3.-a6+a1*a7)/(2.*xi);
>> 338
>> 339 G4double fe = (ale-cre)*be;
>> 340 if ( fe < 0.) fe = 0. ;
>> 341
>> 342 G4double ymu = 4.+a6 +3.*bet*a7 ;
>> 343 G4double ymd = a7*(1.5+a1)*log(3.+xi)+1.-1.5*a6 ;
>> 344 G4double ym1 = 1.+ymu/ymd ;
>> 345 G4double alm_crm = log(bbb*massratio/(1.5*z23*(1.+screen*ym1)));
>> 346 G4double a10,bm;
>> 347 if ( xi >= 1.e-3)
>> 348 {
>> 349 a10 = (1.+a1)*a5 ;
>> 350 bm = (a7*(1.+1.5*bet)-a10*xii)*log(xi1)+xi*(a5-bet)/xi1+a10;
>> 351 } else {
>> 352 bm = (5.-a6+bet*a9)*(xi/2.);
>> 353 }
>> 354
>> 355 G4double fm = alm_crm*bm;
>> 356 if ( fm < 0.) fm = 0. ;
>> 357
>> 358 sum += wgi[i]*a4*(fe+fm/massratio2);
394 } 359 }
395 360
396 G4double ye1[NINTPAIR]; << 361 cross = -tmn*sum*factorForCross*z2*residEnergy/(totalEnergy*pairEnergy);
397 G4double ym1[NINTPAIR]; <<
398 362
399 G4double b40 = 4.0 * beta; << 363 return cross;
400 G4double b62 = 6.0 * beta + 2.0; << 364 }
401 365
402 for (G4int i = 0; i < NINTPAIR; ++i) << 366 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
403 { <<
404 G4double yeu = (b40 + 5.0) + (b40 - 1.0) * <<
405 G4double yed = b62*G4Log(3.0 + xii[i]) + ( <<
406 367
407 G4double ymu = b62 * (1.0 + rho2[i]) + 6.0 << 368 G4double G4MuPairProductionModel::CrossSection(const G4MaterialCutsCouple* couple,
408 G4double ymd = (b40 + 3.0)*(1.0 + rho2[i]) << 369 const G4ParticleDefinition*,
409 + 2.0 - 3.0 * rho2[i]; << 370 G4double kineticEnergy,
>> 371 G4double cutEnergy,
>> 372 G4double maxEnergy)
>> 373 {
>> 374 G4double cross = 0.0;
>> 375 if (kineticEnergy <= lowestKinEnergy) return cross;
410 376
411 ye1[i] = 1.0 + yeu / yed; << 377 maxEnergy += particleMass;
412 ym1[i] = 1.0 + ymu / ymd; <<
413 } <<
414 378
415 G4double be[NINTPAIR]; << 379 const G4Material* material = couple->GetMaterial();
416 G4double bm[NINTPAIR]; << 380 const G4ElementVector* theElementVector = material->GetElementVector();
>> 381 const G4double* theAtomNumDensityVector=material->GetAtomicNumDensityVector();
417 382
418 for(G4int i = 0; i < NINTPAIR; ++i) { << 383 for (size_t i=0; i<material->GetNumberOfElements(); i++) {
419 if(xi[i] <= 1000.0) { << 384 G4double Z = (*theElementVector)[i]->GetZ();
420 be[i] = ((2.0 + rho2[i])*(1.0 + beta) + << 385 SetCurrentElement(Z);
421 xi[i]*(3.0 + rho2[i]))*G4Log(1.0 + xi << 386 G4double tmax = min(maxEnergy,MaxSecondaryEnergy(particle, kineticEnergy));
422 (1.0 - rho2[i] - beta)/xi1[i] - (3.0 + rho2[ << 387 G4double cut = max(minPairEnergy,cutEnergy);
423 } else { << 388 if(cut < tmax) {
424 be[i] = 0.5*(3.0 - rho2[i] + 2.0*beta*(1 << 389 G4double cr = ComputeMicroscopicCrossSection(kineticEnergy, Z, cut)
425 } << 390 - ComputeMicroscopicCrossSection(kineticEnergy, Z, tmax);
426 391
427 if(xi[i] >= 0.001) { << 392 cross += theAtomNumDensityVector[i] * cr;
428 G4double a10 = (1.0 + 2.0 * beta) * (1.0 <<
429 bm[i] = ((1.0 + rho2[i])*(1.0 + 1.5 * be <<
430 xi[i] * (1.0 - rho2[i] - beta) <<
431 } else { <<
432 bm[i] = 0.5*(5.0 - rho2[i] + beta * (3.0 <<
433 } 393 }
434 } 394 }
>> 395 return cross;
>> 396 }
435 397
436 G4double sum = 0.0; << 398 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 399
>> 400 void G4MuPairProductionModel::MakeSamplingTables()
>> 401 {
>> 402 for (G4int iz=0; iz<nzdat; iz++)
>> 403 {
>> 404 G4double Z = zdat[iz];
>> 405 SetCurrentElement(Z);
437 406
438 for (G4int i = 0; i < NINTPAIR; ++i) { << 407 for (G4int it=0; it<ntdat; it++)
439 G4double screen = screen0*xi1[i]/(1.0 - rh << 408 {
440 G4double ale = G4Log(bbb/z13*std::sqrt(xi1 << 409 G4double kineticEnergy = tdat[it];
441 G4double cre = 0.5*G4Log(1. + 2.25*z23*xi1 << 410 G4double maxPairEnergy = MaxSecondaryEnergy(particle,kineticEnergy);
>> 411
>> 412 G4double CrossSection = 0.0 ;
>> 413
>> 414 G4double y = ymin - 0.5*dy ;
>> 415 G4double yy = ymin - dy ;
>> 416 G4double x = exp(y);
>> 417 G4double fac = exp(dy);
>> 418 G4double dx = exp(yy)*(fac - 1.0);
>> 419
>> 420 G4double c = log(maxPairEnergy/minPairEnergy);
>> 421
>> 422 for (G4int i=0 ; i<nbiny; i++)
>> 423 {
>> 424 y += dy ;
>> 425 if(c > 0.0) {
>> 426 x *= fac;
>> 427 dx*= fac;
>> 428 G4double ep = minPairEnergy*exp(c*x) ;
>> 429 CrossSection += ep*dx*ComputeDMicroscopicCrossSection(
>> 430 kineticEnergy, Z, ep);
>> 431 }
>> 432 ya[i] = y;
>> 433 proba[iz][it][i] = CrossSection;
>> 434 }
442 435
443 G4double fe = (ale-cre)*be[i]; << 436 ya[nbiny]=ymax;
444 fe = std::max(fe, 0.0); <<
445 437
446 G4double alm_crm = G4Log(bbb*massratio/(1. << 438 proba[iz][it][nbiny] = CrossSection;
447 G4double fm = std::max(alm_crm*bm[i], 0.0) <<
448 439
449 sum += wgi[i]*(1.0 + rho[i])*(fe + fm); << 440 }
450 } 441 }
451 << 442 samplingTablesAreFilled = true;
452 return -tmn*sum*factorForCross*z2*residEnerg <<
453 } 443 }
454 444
455 //....oooOO0OOooo........oooOO0OOooo........oo 445 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
456 446
457 G4double G4MuPairProductionModel::ComputeCross << 447 G4DynamicParticle* G4MuPairProductionModel::SampleSecondary(
458 con << 448 const G4MaterialCutsCouple*,
459 << 449 const G4DynamicParticle*,
460 << 450 G4double,
461 << 451 G4double)
462 <<
463 { 452 {
464 G4double cross = 0.0; << 453 return 0;
465 if (kineticEnergy <= lowestKinEnergy) { retu <<
466 <<
467 G4double maxPairEnergy = MaxSecondaryEnergyF <<
468 G4double tmax = std::min(maxEnergy, maxPairE <<
469 G4double cut = std::max(cutEnergy, minPairE <<
470 if (cut >= tmax) { return cross; } <<
471 <<
472 cross = ComputeMicroscopicCrossSection(kinet <<
473 if(tmax < kineticEnergy) { <<
474 cross -= ComputeMicroscopicCrossSection(ki <<
475 } <<
476 return cross; <<
477 } 454 }
478 455
479 //....oooOO0OOooo........oooOO0OOooo........oo 456 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
480 457
481 void G4MuPairProductionModel::MakeSamplingTabl << 458 vector<G4DynamicParticle*>* G4MuPairProductionModel::SampleSecondaries(
>> 459 const G4MaterialCutsCouple* couple,
>> 460 const G4DynamicParticle* aDynamicParticle,
>> 461 G4double cut,
>> 462 G4double tmax)
482 { 463 {
483 G4double factore = G4Exp(G4Log(emax/emin)/G4 << 464 G4double kineticEnergy = aDynamicParticle->GetKineticEnergy();
>> 465 G4double totalEnergy = kineticEnergy + particleMass ;
>> 466 G4ParticleMomentum ParticleDirection = aDynamicParticle->GetMomentumDirection();
484 467
485 for (G4int iz=0; iz<NZDATPAIR; ++iz) { << 468 G4int it;
>> 469 for(it=1; it<ntdat; it++) {if(kineticEnergy <= tdat[it]) break;}
>> 470 if(it == ntdat) it--;
>> 471 G4double dt = log(kineticEnergy/tdat[it-1])/log(tdat[it]/tdat[it-1]);
486 472
487 G4double Z = ZDATPAIR[iz]; << 473 // select randomly one element constituing the material
488 G4Physics2DVector* pv = new G4Physics2DVec << 474 G4int iymin = 0;
489 G4double kinEnergy = emin; << 475 G4int iymax = nbiny-1;
490 << 476 const G4Element* anElement = SelectRandomAtom(kineticEnergy, dt, it, couple);
491 for (std::size_t it=0; it<=nbine; ++it) { << 477 SetCurrentElement(anElement->GetZ());
492 << 478
493 pv->PutY(it, G4Log(kinEnergy/CLHEP::MeV) << 479 G4double maxPairEnergy = MaxSecondaryEnergy(particle,kineticEnergy);
494 G4double maxPairEnergy = MaxSecondaryEne << 480 G4double maxEnergy = min(tmax, maxPairEnergy);
495 /* << 481 G4double minEnergy = min(maxEnergy, cut);
496 G4cout << "it= " << it << " E= " << kinE <<
497 << " " << particle->GetParticleN <<
498 << " maxE= " << maxPairEnergy << <<
499 << " ymin= " << ymin << G4endl; <<
500 */ <<
501 G4double coef = G4Log(minPairEnergy/kinE <<
502 G4double ymax = G4Log(maxPairEnergy/kinE <<
503 G4double fac = (ymax - ymin)/dy; <<
504 std::size_t imax = (std::size_t)fac; <<
505 fac -= (G4double)imax; <<
506 <<
507 G4double xSec = 0.0; <<
508 G4double x = ymin; <<
509 /* <<
510 G4cout << "Z= " << currentZ << " z13= " <<
511 << " mE= " << maxPairEnergy << " <<
512 << " dy= " << dy << " c= " << co <<
513 */ <<
514 // start from zero <<
515 pv->PutValue(0, it, 0.0); <<
516 if(0 == it) { pv->PutX(nbiny, 0.0); } <<
517 <<
518 for (std::size_t i=0; i<nbiny; ++i) { <<
519 <<
520 if(0 == it) { pv->PutX(i, x); } <<
521 <<
522 if(i < imax) { <<
523 G4double ep = kinEnergy*G4Exp(coef*( <<
524 <<
525 // not multiplied by interval, becau <<
526 // will be used only for sampling <<
527 //G4cout << "i= " << i << " x= " << <<
528 // << " Egamma= " << ep << G <<
529 xSec += ep*ComputeDMicroscopicCrossS <<
530 <<
531 // last bin before the kinematic lim <<
532 } else if(i == imax) { <<
533 G4double ep = kinEnergy*G4Exp(coef*( <<
534 xSec += ep*fac*ComputeDMicroscopicCr <<
535 } <<
536 pv->PutValue(i + 1, it, xSec); <<
537 x += dy; <<
538 } <<
539 kinEnergy *= factore; <<
540 482
541 // to avoid precision lost << 483 if( minEnergy > minPairEnergy)
542 if(it+1 == nbine) { kinEnergy = emax; } << 484 {
543 } << 485 G4double xc = log(minEnergy/minPairEnergy)/log(maxPairEnergy/minPairEnergy);
544 fElementData->InitialiseForElement(iz, pv) << 486 iymin = (G4int)((log(xc) - ymin)/dy);
>> 487 if(iymin >= nbiny) iymin = nbiny-1;
>> 488 xc = log(maxEnergy/minPairEnergy)/log(maxPairEnergy/minPairEnergy);
>> 489 iymax = (G4int)((log(xc) - ymin)/dy) + 1;
>> 490 if(iymax >= nbiny) iymax = nbiny-1;
545 } 491 }
546 } <<
547 492
548 //....oooOO0OOooo........oooOO0OOooo........oo << 493 // sample e-e+ energy, pair energy first
>> 494 G4int iz, iy;
549 495
550 void G4MuPairProductionModel::SampleSecondarie << 496 for(iz=1; iz<nzdat; iz++) {if(currentZ <= zdat[iz]) break;}
551 std::vector<G4Dy << 497 if(iz == nzdat) iz--;
552 const G4Material <<
553 const G4DynamicP <<
554 G4double tmin, <<
555 G4double tmax) <<
556 { <<
557 G4double kinEnergy = aDynamicParticle->GetKi <<
558 //G4cout << "------- G4MuPairProductionModel <<
559 // << kinEnergy << " " <<
560 // << aDynamicParticle->GetDefinitio <<
561 G4double totalEnergy = kinEnergy + particl <<
562 G4double totalMomentum = <<
563 std::sqrt(kinEnergy*(kinEnergy + 2.0*parti <<
564 498
565 G4ThreeVector partDirection = aDynamicPartic << 499 G4double dz = log(currentZ/zdat[iz-1])/log(zdat[iz]/zdat[iz-1]);
566 500
567 // select randomly one element constituing t << 501 G4double pmin = InterpolatedIntegralCrossSection(dt, dz, iz, it, iymin, currentZ);
568 const G4Element* anElement = SelectRandomAto << 502 G4double pmax = InterpolatedIntegralCrossSection(dt, dz, iz, it, iymax, currentZ);
569 503
570 // define interval of energy transfer << 504 G4double p = pmin+G4UniformRand()*(pmax - pmin);
571 G4double maxPairEnergy = MaxSecondaryEnergyF <<
572 <<
573 G4double maxEnergy = std::min(tmax, maxPairE <<
574 G4double minEnergy = std::max(tmin, minPairE <<
575 <<
576 if (minEnergy >= maxEnergy) { return; } <<
577 //G4cout << "emin= " << minEnergy << " emax= <<
578 // << " minPair= " << minPairEnergy << " max <<
579 // << " ymin= " << ymin << " dy= " << dy <<
580 <<
581 G4double coeff = G4Log(minPairEnergy/kinEner <<
582 <<
583 // compute limits <<
584 G4double yymin = G4Log(minEnergy/kinEnergy)/ <<
585 G4double yymax = G4Log(maxEnergy/kinEnergy)/ <<
586 <<
587 //G4cout << "yymin= " << yymin << " yymax= <<
588 505
589 // units should not be used, bacause table w << 506 // interpolate sampling vector;
590 G4double logTkin = G4Log(kinEnergy/CLHEP::Me << 507 G4double p1 = pmin;
>> 508 G4double p2 = pmin;
>> 509 for(iy=iymin+1; iy<=iymax; iy++) {
>> 510 p1 = p2;
>> 511 p2 = InterpolatedIntegralCrossSection(dt, dz, iz, it, iy, currentZ);
>> 512 if(p <= p2) break;
>> 513 }
>> 514 G4double y = ya[iy-1] + dy*(p - p1)/(p2 - p1);
591 515
592 // sample e-e+ energy, pair energy first << 516 G4double PairEnergy = minPairEnergy*exp(exp(y)*log(maxPairEnergy/minPairEnergy));
>> 517 if(PairEnergy < minEnergy) PairEnergy = minEnergy;
>> 518 if(PairEnergy > maxEnergy) PairEnergy = maxEnergy;
593 519
594 // select sample table via Z << 520 // sample r=(E+-E-)/PairEnergy ( uniformly .....)
595 G4int iz1(0), iz2(0); << 521 G4double rmax =
596 for (G4int iz=0; iz<NZDATPAIR; ++iz) { << 522 (1.-6.*particleMass*particleMass/(totalEnergy*(totalEnergy-PairEnergy)))
597 if(currentZ == ZDATPAIR[iz]) { << 523 *sqrt(1.-minPairEnergy/PairEnergy);
598 iz1 = iz2 = iz; <<
599 break; <<
600 } else if(currentZ < ZDATPAIR[iz]) { <<
601 iz2 = iz; <<
602 if(iz > 0) { iz1 = iz-1; } <<
603 else { iz1 = iz2; } <<
604 break; <<
605 } <<
606 } <<
607 if (0 == iz1) { iz1 = iz2 = NZDATPAIR-1; } <<
608 <<
609 G4double pairEnergy = 0.0; <<
610 G4int count = 0; <<
611 //G4cout << "start loop Z1= " << iz1 << " Z2 <<
612 do { <<
613 ++count; <<
614 // sampling using only one random number <<
615 G4double rand = G4UniformRand(); <<
616 <<
617 G4double x = FindScaledEnergy(iz1, rand, l <<
618 if(iz1 != iz2) { <<
619 G4double x2 = FindScaledEnergy(iz2, rand <<
620 G4double lz1= nist->GetLOGZ(ZDATPAIR[iz1 <<
621 G4double lz2= nist->GetLOGZ(ZDATPAIR[iz2 <<
622 //G4cout << count << ". x= " << x << " <<
623 // << " Z1= " << iz1 << " Z2 <<
624 x += (x2 - x)*(lnZ - lz1)/(lz2 - lz1); <<
625 } <<
626 //G4cout << "x= " << x << " coeff= " << c <<
627 pairEnergy = kinEnergy*G4Exp(x*coeff); <<
628 <<
629 // Loop checking, 03-Aug-2015, Vladimir Iv <<
630 } while((pairEnergy < minEnergy || pairEnerg <<
631 <<
632 //G4cout << "## pairEnergy(GeV)= " << pairEn <<
633 // << " Etot(GeV)= " << totalEnergy/ <<
634 <<
635 // sample r=(E+-E-)/pairEnergy ( uniformly <<
636 G4double rmax = <<
637 (1.-6.*particleMass*particleMass/(totalEne <<
638 *std::sqrt(1.-minPairEnergy/pairEnergy); <<
639 G4double r = rmax * (-1.+2.*G4UniformRand()) 524 G4double r = rmax * (-1.+2.*G4UniformRand()) ;
640 525
641 // compute energies from pairEnergy,r << 526 // compute energies from PairEnergy,r
642 G4double eEnergy = (1.-r)*pairEnergy*0.5; << 527 G4double ElectronEnergy = (1.-r)*PairEnergy*0.5;
643 G4double pEnergy = pairEnergy - eEnergy; << 528 G4double PositronEnergy = PairEnergy - ElectronEnergy;
644 << 529
645 // Sample angles << 530 // angles of the emitted particles ( Z - axis along the parent particle)
646 G4ThreeVector eDirection, pDirection; << 531 // (mean theta for the moment)
647 // << 532 G4double Teta = electron_mass_c2/totalEnergy ;
648 GetAngularDistribution()->SamplePairDirectio << 533
649 << 534 G4double Phi = twopi * G4UniformRand() ;
650 << 535 G4double dirx = sin(Teta)*cos(Phi);
651 // create G4DynamicParticle object for e+e- << 536 G4double diry = sin(Teta)*sin(Phi);
652 eEnergy = std::max(eEnergy - CLHEP::electron << 537 G4double dirz = cos(Teta) ;
653 pEnergy = std::max(pEnergy - CLHEP::electron << 538
654 auto aParticle1 = new G4DynamicParticle(theE << 539 //G4double finalPx,finalPy,finalPz ;
655 auto aParticle2 = new G4DynamicParticle(theP << 540 G4double ElectKineEnergy = ElectronEnergy - electron_mass_c2 ;
656 // Fill output vector << 541
>> 542 G4ThreeVector ElectDirection ( dirx, diry, dirz );
>> 543 ElectDirection.rotateUz(ParticleDirection);
>> 544
>> 545 // create G4DynamicParticle object for the particle1
>> 546 G4DynamicParticle* aParticle1= new G4DynamicParticle(G4Electron::Electron(),
>> 547 ElectDirection,
>> 548 ElectKineEnergy);
>> 549
>> 550 G4double PositKineEnergy = PositronEnergy - electron_mass_c2 ;
>> 551
>> 552 G4ThreeVector PositDirection ( -dirx, -diry, dirz );
>> 553 PositDirection.rotateUz(ParticleDirection);
>> 554
>> 555 // create G4DynamicParticle object for the particle2
>> 556 G4DynamicParticle* aParticle2= new G4DynamicParticle(G4Positron::Positron(),
>> 557 PositDirection,
>> 558 PositKineEnergy);
>> 559
>> 560
>> 561 vector<G4DynamicParticle*>* vdp = new vector<G4DynamicParticle*>;
657 vdp->push_back(aParticle1); 562 vdp->push_back(aParticle1);
658 vdp->push_back(aParticle2); 563 vdp->push_back(aParticle2);
659 564
660 // primary change << 565 return vdp;
661 kinEnergy -= pairEnergy; <<
662 partDirection *= totalMomentum; <<
663 partDirection -= (aParticle1->GetMomentum() <<
664 partDirection = partDirection.unit(); <<
665 <<
666 // if energy transfer is higher than thresho <<
667 // then stop tracking the primary particle a <<
668 if (pairEnergy > SecondaryThreshold()) { <<
669 fParticleChange->ProposeTrackStatus(fStopA <<
670 fParticleChange->SetProposedKineticEnergy( <<
671 auto newdp = new G4DynamicParticle(particl <<
672 vdp->push_back(newdp); <<
673 } else { // continue tracking the primary e- <<
674 fParticleChange->SetProposedMomentumDirect <<
675 fParticleChange->SetProposedKineticEnergy( <<
676 } <<
677 //G4cout << "-- G4MuPairProductionModel::Sam <<
678 } 566 }
679 567
680 //....oooOO0OOooo........oooOO0OOooo........oo 568 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
681 569
682 G4double << 570 const G4Element* G4MuPairProductionModel::SelectRandomAtom(
683 G4MuPairProductionModel::FindScaledEnergy(G4in << 571 G4double kinEnergy, G4double dt, G4int it,
684 G4double logTkin, << 572 const G4MaterialCutsCouple* couple)
685 G4double yymin, G4double yymax) <<
686 { 573 {
687 G4double res = yymin; << 574 // select randomly 1 element within the material
688 G4Physics2DVector* pv = fElementData->GetEle << 575
689 if (nullptr != pv) { << 576 const G4Material* material = couple->GetMaterial();
690 G4double pmin = pv->Value(yymin, logTkin); << 577 size_t nElements = material->GetNumberOfElements();
691 G4double pmax = pv->Value(yymax, logTkin); << 578 const G4ElementVector* theElementVector = material->GetElementVector();
692 G4double p0 = pv->Value(0.0, logTkin); << 579 if (nElements == 1) return (*theElementVector)[0];
693 if(p0 <= 0.0) { DataCorrupted(ZDATPAIR[iz] << 580
694 else { res = pv->FindLinearX((pmin + rand* << 581 if(nElements > nmaxElements) {
695 } else { << 582 nmaxElements = nElements;
696 DataCorrupted(ZDATPAIR[iz], logTkin); << 583 partialSum.resize(nmaxElements);
697 } 584 }
698 return res; <<
699 } <<
700 585
701 //....oooOO0OOooo........oooOO0OOooo........oo << 586 const G4double* theAtomNumDensityVector=material->GetAtomicNumDensityVector();
702 587
703 void G4MuPairProductionModel::DataCorrupted(G4 << 588 G4double sum = 0.0;
704 { <<
705 G4ExceptionDescription ed; <<
706 ed << "G4ElementData is not properly initial <<
707 << " Ekin(MeV)= " << G4Exp(logTkin) <<
708 << " IsMasterThread= " << IsMaster() <<
709 << " Model " << GetName(); <<
710 G4Exception("G4MuPairProductionModel::()", " <<
711 } <<
712 589
713 //....oooOO0OOooo........oooOO0OOooo........oo << 590 size_t i;
>> 591 for (i=0; i<nElements; i++) {
>> 592 G4double Z = ((*theElementVector)[i])->GetZ();
>> 593 SetCurrentElement(Z);
>> 594 G4double maxPairEnergy = MaxSecondaryEnergy(particle,kinEnergy);
>> 595
>> 596 G4int iz;
>> 597 for(iz=1; iz<nzdat; iz++) {if(Z <= zdat[iz]) break;}
>> 598 if(iz == nzdat) iz--;
>> 599 G4double dz = log(Z/zdat[iz-1])/log(zdat[iz]/zdat[iz-1]);
>> 600
>> 601 G4double xc = log(kinEnergy/minPairEnergy)/log(maxPairEnergy/minPairEnergy);
>> 602 G4int iy = (G4int)((log(xc) - ymin)/dy);
>> 603 if(iy >= nbiny) iy = nbiny-1;
>> 604
>> 605 G4double sigtot = InterpolatedIntegralCrossSection(dt, dz, iz, it, nbiny, Z);
>> 606 G4double sigcut = InterpolatedIntegralCrossSection(dt, dz, iz, it, iy, Z);
>> 607 sum += (sigtot - sigcut)*theAtomNumDensityVector[i];
>> 608 partialSum[i] = sum;
>> 609 }
>> 610
>> 611 G4double rval = G4UniformRand()*sum;
>> 612 for (i=0; i<nElements; i++) {if(rval<=partialSum[i]) break;}
>> 613 return (*theElementVector)[i];
714 614
715 void G4MuPairProductionModel::StoreTables() co <<
716 { <<
717 for (G4int iz=0; iz<NZDATPAIR; ++iz) { <<
718 G4int Z = ZDATPAIR[iz]; <<
719 G4Physics2DVector* pv = fElementData->GetE <<
720 if(nullptr == pv) { <<
721 DataCorrupted(Z, 1.0); <<
722 return; <<
723 } <<
724 std::ostringstream ss; <<
725 ss << "mupair/" << particle->GetParticleNa <<
726 std::ofstream outfile(ss.str()); <<
727 pv->Store(outfile); <<
728 } <<
729 } 615 }
730 616
731 //....oooOO0OOooo........oooOO0OOooo........oo 617 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
732 618
733 G4bool G4MuPairProductionModel::RetrieveTables <<
734 { <<
735 for (G4int iz=0; iz<NZDATPAIR; ++iz) { <<
736 G4double Z = ZDATPAIR[iz]; <<
737 G4Physics2DVector* pv = new G4Physics2DVec <<
738 std::ostringstream ss; <<
739 ss << G4EmParameters::Instance()->GetDirLE <<
740 << particle->GetParticleName() << Z << <<
741 std::ifstream infile(ss.str(), std::ios::i <<
742 if(!pv->Retrieve(infile)) { <<
743 delete pv; <<
744 return false; <<
745 } <<
746 fElementData->InitialiseForElement(iz, pv) <<
747 } <<
748 return true; <<
749 } <<
750 619
751 //....oooOO0OOooo........oooOO0OOooo........oo <<
752 620