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25 // 25 //
>> 26 // $Id: G4MuPairProductionModel.cc 91743 2015-08-04 11:49:58Z gcosmo $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class file 30 // GEANT4 Class file
30 // 31 //
31 // 32 //
32 // File name: G4MuPairProductionModel 33 // File name: G4MuPairProductionModel
33 // 34 //
34 // Author: Vladimir Ivanchenko on base 35 // Author: Vladimir Ivanchenko on base of Laszlo Urban code
35 // 36 //
36 // Creation date: 24.06.2002 37 // Creation date: 24.06.2002
37 // 38 //
38 // Modifications: 39 // Modifications:
39 // 40 //
40 // 04-12-02 Change G4DynamicParticle construct 41 // 04-12-02 Change G4DynamicParticle constructor in PostStep (V.Ivanchenko)
41 // 23-12-02 Change interface in order to move 42 // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
42 // 24-01-03 Fix for compounds (V.Ivanchenko) 43 // 24-01-03 Fix for compounds (V.Ivanchenko)
43 // 27-01-03 Make models region aware (V.Ivanch 44 // 27-01-03 Make models region aware (V.Ivanchenko)
44 // 13-02-03 Add model (V.Ivanchenko) 45 // 13-02-03 Add model (V.Ivanchenko)
45 // 06-06-03 Fix in cross section calculation f 46 // 06-06-03 Fix in cross section calculation for high energy (V.Ivanchenko)
46 // 20-10-03 2*xi in ComputeDDMicroscopicCrossS 47 // 20-10-03 2*xi in ComputeDDMicroscopicCrossSection (R.Kokoulin)
47 // 8 integration points in ComputeDMi 48 // 8 integration points in ComputeDMicroscopicCrossSection
48 // 12-01-04 Take min cut of e- and e+ not its 49 // 12-01-04 Take min cut of e- and e+ not its sum (V.Ivanchenko)
49 // 10-02-04 Update parameterisation using R.Ko 50 // 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko)
50 // 28-04-04 For complex materials repeat calcu 51 // 28-04-04 For complex materials repeat calculation of max energy for each
51 // material (V.Ivanchenko) 52 // material (V.Ivanchenko)
52 // 01-11-04 Fix bug inside ComputeDMicroscopic 53 // 01-11-04 Fix bug inside ComputeDMicroscopicCrossSection (R.Kokoulin)
53 // 08-04-05 Major optimisation of internal int 54 // 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
54 // 03-08-05 Add SetParticle method (V.Ivantche 55 // 03-08-05 Add SetParticle method (V.Ivantchenko)
55 // 23-10-05 Add protection in sampling of e+e- 56 // 23-10-05 Add protection in sampling of e+e- pair energy needed for
56 // low cuts (V.Ivantchenko) 57 // low cuts (V.Ivantchenko)
57 // 13-02-06 Add ComputeCrossSectionPerAtom (mm 58 // 13-02-06 Add ComputeCrossSectionPerAtom (mma)
58 // 24-04-07 Add protection in SelectRandomAtom 59 // 24-04-07 Add protection in SelectRandomAtom method (V.Ivantchenko)
59 // 12-05-06 Updated sampling (use cut) in Sele 60 // 12-05-06 Updated sampling (use cut) in SelectRandomAtom (A.Bogdanov)
60 // 11-10-07 Add ignoreCut flag (V.Ivanchenko) 61 // 11-10-07 Add ignoreCut flag (V.Ivanchenko)
61 62
62 // 63 //
63 // Class Description: 64 // Class Description:
64 // 65 //
65 // 66 //
66 // ------------------------------------------- 67 // -------------------------------------------------------------------
67 // 68 //
68 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69 //....oooOO0OOooo........oooOO0OOooo........oo 70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
70 71
71 #include "G4MuPairProductionModel.hh" 72 #include "G4MuPairProductionModel.hh"
72 #include "G4PhysicalConstants.hh" 73 #include "G4PhysicalConstants.hh"
73 #include "G4SystemOfUnits.hh" 74 #include "G4SystemOfUnits.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 "G4ParticleChangeForGamma.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> <<
92 #include <fstream> <<
93 88
94 //....oooOO0OOooo........oooOO0OOooo........oo 89 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
95 90
96 const G4int G4MuPairProductionModel::ZDATPAIR[ << 91 // static members
97 << 92 //
98 const G4double G4MuPairProductionModel::xgi[] << 93 const G4int G4MuPairProductionModel::zdat[]={1, 4, 13, 29, 92};
99 0.0198550717512320, 0.1016667612931865, 0. << 94 const G4double G4MuPairProductionModel::adat[]={1.01, 9.01,26.98, 63.55, 238.03};
100 0.5917173212478250, 0.7627662049581645, 0. << 95 const G4double G4MuPairProductionModel::xgi[]={ 0.0199, 0.1017, 0.2372, 0.4083,
101 }; << 96 0.5917, 0.7628, 0.8983, 0.9801 };
102 << 97 const G4double G4MuPairProductionModel::wgi[]={ 0.0506, 0.1112, 0.1569, 0.1813,
103 const G4double G4MuPairProductionModel::wgi[] << 98 0.1813, 0.1569, 0.1112, 0.0506 };
104 0.0506142681451880, 0.1111905172266870, 0. <<
105 0.1813418916891810, 0.1568533229389435, 0. <<
106 }; <<
107 <<
108 namespace <<
109 { <<
110 G4Mutex theMuPairMutex = G4MUTEX_INITIALIZER <<
111 <<
112 const G4double ak1 = 6.9; <<
113 const G4double ak2 = 1.0; <<
114 } <<
115 99
116 //....oooOO0OOooo........oooOO0OOooo........oo 100 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
117 101
>> 102 using namespace std;
>> 103
118 G4MuPairProductionModel::G4MuPairProductionMod 104 G4MuPairProductionModel::G4MuPairProductionModel(const G4ParticleDefinition* p,
119 105 const G4String& nam)
120 : G4VEmModel(nam), 106 : G4VEmModel(nam),
121 factorForCross(CLHEP::fine_structure_const*C << 107 particle(0),
122 CLHEP::classic_electr_radius*CLHEP::class << 108 factorForCross(4.*fine_structure_const*fine_structure_const
123 4./(3.*CLHEP::pi)), << 109 *classic_electr_radius*classic_electr_radius/(3.*pi)),
124 sqrte(std::sqrt(G4Exp(1.))), << 110 sqrte(sqrt(G4Exp(1.))),
125 minPairEnergy(4.*CLHEP::electron_mass_c2), << 111 currentZ(0),
126 lowestKinEnergy(0.85*CLHEP::GeV) << 112 fParticleChange(0),
>> 113 minPairEnergy(4.*electron_mass_c2),
>> 114 lowestKinEnergy(1.0*GeV),
>> 115 nzdat(5),
>> 116 nYBinPerDecade(4),
>> 117 nbiny(1000),
>> 118 nbine(0),
>> 119 ymin(-5.),
>> 120 dy(0.005)
127 { 121 {
128 nist = G4NistManager::Instance(); 122 nist = G4NistManager::Instance();
129 123
130 theElectron = G4Electron::Electron(); 124 theElectron = G4Electron::Electron();
131 thePositron = G4Positron::Positron(); 125 thePositron = G4Positron::Positron();
132 126
133 if(nullptr != p) { << 127 particleMass = lnZ = z13 = z23 = 0;
>> 128
>> 129 // setup lowest limit dependent on particle mass
>> 130 if(p) {
134 SetParticle(p); 131 SetParticle(p);
135 lowestKinEnergy = std::max(lowestKinEnergy << 132 G4double limit = p->GetPDGMass()*8;
>> 133 if(limit > lowestKinEnergy) { lowestKinEnergy = limit; }
136 } 134 }
137 emin = lowestKinEnergy; 135 emin = lowestKinEnergy;
138 emax = emin*10000.; << 136 emax = 10*TeV;
139 SetAngularDistribution(new G4ModifiedMephi() <<
140 } 137 }
141 138
142 //....oooOO0OOooo........oooOO0OOooo........oo 139 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
143 140
>> 141 G4MuPairProductionModel::~G4MuPairProductionModel()
>> 142 {}
>> 143
>> 144 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 145
144 G4double G4MuPairProductionModel::MinPrimaryEn 146 G4double G4MuPairProductionModel::MinPrimaryEnergy(const G4Material*,
145 147 const G4ParticleDefinition*,
146 148 G4double cut)
147 { 149 {
148 return std::max(lowestKinEnergy, cut); << 150 return std::max(lowestKinEnergy,cut);
149 } 151 }
150 152
151 //....oooOO0OOooo........oooOO0OOooo........oo 153 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
152 154
153 void G4MuPairProductionModel::Initialise(const 155 void G4MuPairProductionModel::Initialise(const G4ParticleDefinition* p,
154 const 156 const G4DataVector& cuts)
155 { 157 {
156 SetParticle(p); 158 SetParticle(p);
>> 159 if(!fParticleChange) { fParticleChange = GetParticleChangeForLoss(); }
157 160
158 if (nullptr == fParticleChange) { << 161 // for low-energy application this process should not work
159 fParticleChange = GetParticleChangeForLoss << 162 if(lowestKinEnergy >= HighEnergyLimit()) { return; }
160 163
161 // define scale of internal table for each << 164 // define scale of internal table for each thread only once
162 if (0 == nbine) { << 165 if(0 == nbine) {
163 emin = std::max(lowestKinEnergy, LowEner << 166 emin = std::max(lowestKinEnergy, LowEnergyLimit());
164 emax = std::max(HighEnergyLimit(), emin* << 167 emax = std::max(HighEnergyLimit(), emin*2);
165 nbine = std::size_t(nYBinPerDecade*std:: << 168 nbine = size_t(nYBinPerDecade*std::log10(emax/emin));
166 if(nbine < 3) { nbine = 3; } << 169 if(nbine < 3) { nbine = 3; }
167 170
168 ymin = G4Log(minPairEnergy/emin); << 171 ymin = G4Log(minPairEnergy/emin);
169 dy = -ymin/G4double(nbiny); << 172 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 } 173 }
190 174
191 // for low-energy application this process s << 175 if(IsMaster() && p == particle) {
192 if(lowestKinEnergy >= HighEnergyLimit()) { r << 176
193 << 177 if(!fElementData) {
194 if (p == particle) { << 178 fElementData = new G4ElementData();
195 fElementData = << 179 MakeSamplingTables();
196 G4ElementDataRegistry::Instance()->GetEl << 180 }
197 if (nullptr == fElementData) { << 181 InitialiseElementSelectors(p, cuts);
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 } 182 }
215 } 183 }
216 184
217 //....oooOO0OOooo........oooOO0OOooo........oo 185 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
218 186
219 void G4MuPairProductionModel::InitialiseLocal( 187 void G4MuPairProductionModel::InitialiseLocal(const G4ParticleDefinition* p,
220 188 G4VEmModel* masterModel)
221 { 189 {
222 if(p == particle && lowestKinEnergy < HighEn 190 if(p == particle && lowestKinEnergy < HighEnergyLimit()) {
223 SetElementSelectors(masterModel->GetElemen 191 SetElementSelectors(masterModel->GetElementSelectors());
>> 192 fElementData = masterModel->GetElementData();
224 } 193 }
225 } 194 }
226 195
227 //....oooOO0OOooo........oooOO0OOooo........oo 196 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
228 197
229 G4double G4MuPairProductionModel::ComputeDEDXP 198 G4double G4MuPairProductionModel::ComputeDEDXPerVolume(
230 199 const G4Material* material,
231 200 const G4ParticleDefinition*,
232 201 G4double kineticEnergy,
233 202 G4double cutEnergy)
234 { 203 {
235 G4double dedx = 0.0; 204 G4double dedx = 0.0;
236 if (cutEnergy <= minPairEnergy || kineticEne 205 if (cutEnergy <= minPairEnergy || kineticEnergy <= lowestKinEnergy)
237 { return dedx; } 206 { return dedx; }
238 207
239 const G4ElementVector* theElementVector = ma 208 const G4ElementVector* theElementVector = material->GetElementVector();
240 const G4double* theAtomicNumDensityVector = 209 const G4double* theAtomicNumDensityVector =
241 material->G 210 material->GetAtomicNumDensityVector();
242 211
243 // loop for elements in the material 212 // loop for elements in the material
244 for (std::size_t i=0; i<material->GetNumberO << 213 for (size_t i=0; i<material->GetNumberOfElements(); ++i) {
245 G4double Z = (*theElementVector)[i]->GetZ 214 G4double Z = (*theElementVector)[i]->GetZ();
246 G4double tmax = MaxSecondaryEnergyForElem 215 G4double tmax = MaxSecondaryEnergyForElement(kineticEnergy, Z);
247 G4double loss = ComputMuPairLoss(Z, kinet 216 G4double loss = ComputMuPairLoss(Z, kineticEnergy, cutEnergy, tmax);
248 dedx += loss*theAtomicNumDensityVector[i] 217 dedx += loss*theAtomicNumDensityVector[i];
249 } 218 }
250 dedx = std::max(dedx, 0.0); << 219 if (dedx < 0.) { dedx = 0.; }
251 return dedx; 220 return dedx;
252 } 221 }
253 222
254 //....oooOO0OOooo........oooOO0OOooo........oo 223 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
255 224
256 G4double G4MuPairProductionModel::ComputMuPair 225 G4double G4MuPairProductionModel::ComputMuPairLoss(G4double Z,
257 226 G4double tkin,
258 227 G4double cutEnergy,
259 228 G4double tmax)
260 { 229 {
261 G4double loss = 0.0; 230 G4double loss = 0.0;
262 231
263 G4double cut = std::min(cutEnergy, tmax); << 232 G4double cut = std::min(cutEnergy,tmax);
264 if(cut <= minPairEnergy) { return loss; } 233 if(cut <= minPairEnergy) { return loss; }
265 234
266 // calculate the rectricted loss 235 // calculate the rectricted loss
267 // numerical integration in log(PairEnergy) 236 // numerical integration in log(PairEnergy)
>> 237 G4double ak1=6.9;
>> 238 G4double ak2=1.0;
268 G4double aaa = G4Log(minPairEnergy); 239 G4double aaa = G4Log(minPairEnergy);
269 G4double bbb = G4Log(cut); 240 G4double bbb = G4Log(cut);
270 241
271 G4int kkk = std::min(std::max(G4lrint((bbb-a << 242 G4int kkk = (G4int)((bbb-aaa)/ak1+ak2);
272 G4double hhh = (bbb-aaa)/kkk; << 243 if (kkk > 8) { kkk = 8; }
>> 244 else if (kkk < 1) { kkk = 1; }
>> 245
>> 246 G4double hhh = (bbb-aaa)/(G4double)kkk;
273 G4double x = aaa; 247 G4double x = aaa;
274 248
275 for (G4int l=0 ; l<kkk; ++l) { << 249 for (G4int l=0 ; l<kkk; l++)
276 for (G4int ll=0; ll<NINTPAIR; ++ll) { << 250 {
>> 251
>> 252 for (G4int ll=0; ll<8; ll++)
>> 253 {
277 G4double ep = G4Exp(x+xgi[ll]*hhh); 254 G4double ep = G4Exp(x+xgi[ll]*hhh);
278 loss += wgi[ll]*ep*ep*ComputeDMicroscopi 255 loss += wgi[ll]*ep*ep*ComputeDMicroscopicCrossSection(tkin, Z, ep);
279 } 256 }
280 x += hhh; 257 x += hhh;
281 } 258 }
282 loss *= hhh; 259 loss *= hhh;
283 loss = std::max(loss, 0.0); << 260 if (loss < 0.) loss = 0.;
284 return loss; 261 return loss;
285 } 262 }
286 263
287 //....oooOO0OOooo........oooOO0OOooo........oo 264 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
288 265
289 G4double G4MuPairProductionModel::ComputeMicro 266 G4double G4MuPairProductionModel::ComputeMicroscopicCrossSection(
290 G4d 267 G4double tkin,
291 G4d 268 G4double Z,
292 G4d 269 G4double cutEnergy)
293 { 270 {
294 G4double cross = 0.; 271 G4double cross = 0.;
295 G4double tmax = MaxSecondaryEnergyForElement 272 G4double tmax = MaxSecondaryEnergyForElement(tkin, Z);
296 G4double cut = std::max(cutEnergy, minPairE 273 G4double cut = std::max(cutEnergy, minPairEnergy);
297 if (tmax <= cut) { return cross; } 274 if (tmax <= cut) { return cross; }
298 275
>> 276 G4double ak1=6.9 ;
>> 277 G4double ak2=1.0 ;
299 G4double aaa = G4Log(cut); 278 G4double aaa = G4Log(cut);
300 G4double bbb = G4Log(tmax); 279 G4double bbb = G4Log(tmax);
301 G4int kkk = std::min(std::max(G4lrint((bbb-a << 280 G4int kkk = (G4int)((bbb-aaa)/ak1 + ak2);
>> 281 if(kkk > 8) { kkk = 8; }
>> 282 else if (kkk < 1) { kkk = 1; }
302 283
303 G4double hhh = (bbb-aaa)/(kkk); << 284 G4double hhh = (bbb-aaa)/G4double(kkk);
304 G4double x = aaa; 285 G4double x = aaa;
305 286
306 for (G4int l=0; l<kkk; ++l) { << 287 for(G4int l=0; l<kkk; ++l)
307 for (G4int i=0; i<NINTPAIR; ++i) { << 288 {
>> 289 for(G4int i=0; i<8; ++i)
>> 290 {
308 G4double ep = G4Exp(x + xgi[i]*hhh); 291 G4double ep = G4Exp(x + xgi[i]*hhh);
309 cross += ep*wgi[i]*ComputeDMicroscopicCr 292 cross += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
310 } 293 }
311 x += hhh; 294 x += hhh;
312 } 295 }
313 296
314 cross *= hhh; 297 cross *= hhh;
315 cross = std::max(cross, 0.0); << 298 if(cross < 0.0) { cross = 0.0; }
316 return cross; 299 return cross;
317 } 300 }
318 301
319 //....oooOO0OOooo........oooOO0OOooo........oo 302 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
320 303
321 G4double G4MuPairProductionModel::ComputeDMicr 304 G4double G4MuPairProductionModel::ComputeDMicroscopicCrossSection(
322 G4d 305 G4double tkin,
323 G4d 306 G4double Z,
324 G4d 307 G4double pairEnergy)
325 // Calculates the differential (D) microscopi << 308 // Calculates the differential (D) microscopic cross section
326 // using the cross section formula of R.P. Kok << 309 // using the cross section formula of R.P. Kokoulin (18/01/98)
327 // Code modified by R.P. Kokoulin, V.N. Ivanch << 310 // Code modified by R.P. Kokoulin, V.N. Ivanchenko (27/01/04)
328 { 311 {
329 static const G4double bbbtf= 183. ; 312 static const G4double bbbtf= 183. ;
330 static const G4double bbbh = 202.4 ; 313 static const G4double bbbh = 202.4 ;
331 static const G4double g1tf = 1.95e-5 ; 314 static const G4double g1tf = 1.95e-5 ;
332 static const G4double g2tf = 5.3e-5 ; 315 static const G4double g2tf = 5.3e-5 ;
333 static const G4double g1h = 4.4e-5 ; 316 static const G4double g1h = 4.4e-5 ;
334 static const G4double g2h = 4.8e-5 ; 317 static const G4double g2h = 4.8e-5 ;
335 318
336 if (pairEnergy <= minPairEnergy) <<
337 return 0.0; <<
338 <<
339 G4double totalEnergy = tkin + particleMass; 319 G4double totalEnergy = tkin + particleMass;
340 G4double residEnergy = totalEnergy - pairEn 320 G4double residEnergy = totalEnergy - pairEnergy;
>> 321 G4double massratio = particleMass/electron_mass_c2 ;
>> 322 G4double massratio2 = massratio*massratio ;
>> 323 G4double cross = 0.;
341 324
342 if (residEnergy <= 0.75*sqrte*z13*particleMa << 325 G4double c3 = 0.75*sqrte*particleMass;
343 return 0.0; << 326 if (residEnergy <= c3*z13) { return cross; }
344 <<
345 G4double a0 = 1.0 / (totalEnergy * residEner <<
346 G4double alf = 4.0 * electron_mass_c2 / pair <<
347 G4double rt = std::sqrt(1.0 - alf); <<
348 G4double delta = 6.0 * particleMass * partic <<
349 G4double tmnexp = alf/(1.0 + rt) + delta*rt; <<
350 <<
351 if(tmnexp >= 1.0) { return 0.0; } <<
352 <<
353 G4double tmn = G4Log(tmnexp); <<
354 327
355 G4double massratio = particleMass/CLHEP::ele << 328 G4double c7 = 4.*CLHEP::electron_mass_c2;
356 G4double massratio2 = massratio*massratio; << 329 G4double c8 = 6.*particleMass*particleMass;
357 G4double inv_massratio2 = 1.0 / massratio2; << 330 G4double alf = c7/pairEnergy;
>> 331 G4double a3 = 1. - alf;
>> 332 if (a3 <= 0.) { return cross; }
358 333
359 // zeta calculation 334 // zeta calculation
360 G4double bbb,g1,g2; 335 G4double bbb,g1,g2;
361 if( Z < 1.5 ) { bbb = bbbh ; g1 = g1h ; g2 = 336 if( Z < 1.5 ) { bbb = bbbh ; g1 = g1h ; g2 = g2h ; }
362 else { bbb = bbbtf; g1 = g1tf; g2 = 337 else { bbb = bbbtf; g1 = g1tf; g2 = g2tf; }
363 338
364 G4double zeta = 0.0; << 339 G4double zeta = 0;
365 G4double z1exp = totalEnergy / (particleMass << 340 G4double zeta1 =
366 << 341 0.073*G4Log(totalEnergy/(particleMass+g1*z23*totalEnergy))-0.26;
367 // 35.221047195922 is the root of zeta1(x) = << 342 if ( zeta1 > 0.)
368 // condition below is the same as zeta1 > 0. <<
369 if (z1exp > 35.221047195922) <<
370 { 343 {
371 G4double z2exp = totalEnergy / (particleMa << 344 G4double zeta2 =
372 zeta = (0.073 * G4Log(z1exp) - 0.26) / (0. << 345 0.058*G4Log(totalEnergy/(particleMass+g2*z13*totalEnergy))-0.14;
>> 346 zeta = zeta1/zeta2 ;
373 } 347 }
374 348
375 G4double z2 = Z*(Z+zeta); 349 G4double z2 = Z*(Z+zeta);
376 G4double screen0 = 2.*electron_mass_c2*sqrte 350 G4double screen0 = 2.*electron_mass_c2*sqrte*bbb/(z13*pairEnergy);
377 G4double beta = 0.5*pairEnergy*pairEnergy*a0 << 351 G4double a0 = totalEnergy*residEnergy;
378 G4double xi0 = 0.5*massratio2*beta; << 352 G4double a1 = pairEnergy*pairEnergy/a0;
379 << 353 G4double bet = 0.5*a1;
380 // Gaussian integration in ln(1-ro) ( with 8 << 354 G4double xi0 = 0.25*massratio2*a1;
381 G4double rho[NINTPAIR]; << 355 G4double del = c8/a0;
382 G4double rho2[NINTPAIR]; << 356
383 G4double xi[NINTPAIR]; << 357 G4double rta3 = sqrt(a3);
384 G4double xi1[NINTPAIR]; << 358 G4double tmnexp = alf/(1. + rta3) + del*rta3;
385 G4double xii[NINTPAIR]; << 359 if(tmnexp >= 1.0) { return cross; }
386 360
387 for (G4int i = 0; i < NINTPAIR; ++i) << 361 G4double tmn = G4Log(tmnexp);
388 { << 362 G4double sum = 0.;
389 rho[i] = G4Exp(tmn*xgi[i]) - 1.0; // rho = <<
390 rho2[i] = rho[i] * rho[i]; <<
391 xi[i] = xi0*(1.0-rho2[i]); <<
392 xi1[i] = 1.0 + xi[i]; <<
393 xii[i] = 1.0 / xi[i]; <<
394 } <<
395 <<
396 G4double ye1[NINTPAIR]; <<
397 G4double ym1[NINTPAIR]; <<
398 <<
399 G4double b40 = 4.0 * beta; <<
400 G4double b62 = 6.0 * beta + 2.0; <<
401 363
402 for (G4int i = 0; i < NINTPAIR; ++i) << 364 // Gaussian integration in ln(1-ro) ( with 8 points)
>> 365 for (G4int i=0; i<8; ++i)
403 { 366 {
404 G4double yeu = (b40 + 5.0) + (b40 - 1.0) * << 367 G4double a4 = G4Exp(tmn*xgi[i]); // a4 = (1.-asymmetry)
405 G4double yed = b62*G4Log(3.0 + xii[i]) + ( << 368 G4double a5 = a4*(2.-a4) ;
406 << 369 G4double a6 = 1.-a5 ;
407 G4double ymu = b62 * (1.0 + rho2[i]) + 6.0 << 370 G4double a7 = 1.+a6 ;
408 G4double ymd = (b40 + 3.0)*(1.0 + rho2[i]) << 371 G4double a9 = 3.+a6 ;
409 + 2.0 - 3.0 * rho2[i]; << 372 G4double xi = xi0*a5 ;
410 << 373 G4double xii = 1./xi ;
411 ye1[i] = 1.0 + yeu / yed; << 374 G4double xi1 = 1.+xi ;
412 ym1[i] = 1.0 + ymu / ymd; << 375 G4double screen = screen0*xi1/a5 ;
413 } << 376 G4double yeu = 5.-a6+4.*bet*a7 ;
414 << 377 G4double yed = 2.*(1.+3.*bet)*G4Log(3.+xii)-a6-a1*(2.-a6) ;
415 G4double be[NINTPAIR]; << 378 G4double ye1 = 1.+yeu/yed ;
416 G4double bm[NINTPAIR]; << 379 G4double ale = G4Log(bbb/z13*sqrt(xi1*ye1)/(1.+screen*ye1)) ;
417 << 380 G4double cre = 0.5*G4Log(1.+2.25*z23*xi1*ye1/massratio2) ;
418 for(G4int i = 0; i < NINTPAIR; ++i) { << 381 G4double be;
419 if(xi[i] <= 1000.0) { << 382
420 be[i] = ((2.0 + rho2[i])*(1.0 + beta) + << 383 if (xi <= 1.e3) {
421 xi[i]*(3.0 + rho2[i]))*G4Log(1.0 + xi << 384 be = ((2.+a6)*(1.+bet)+xi*a9)*G4Log(1.+xii)+(a5-bet)/xi1-a9;
422 (1.0 - rho2[i] - beta)/xi1[i] - (3.0 + rho2[ << 385 } else {
>> 386 be = (3.-a6+a1*a7)/(2.*xi);
>> 387 }
>> 388 G4double fe = (ale-cre)*be;
>> 389 if ( fe < 0.) fe = 0. ;
>> 390
>> 391 G4double ymu = 4.+a6 +3.*bet*a7 ;
>> 392 G4double ymd = a7*(1.5+a1)*G4Log(3.+xi)+1.-1.5*a6 ;
>> 393 G4double ym1 = 1.+ymu/ymd ;
>> 394 G4double alm_crm = G4Log(bbb*massratio/(1.5*z23*(1.+screen*ym1)));
>> 395 G4double a10,bm;
>> 396 if ( xi >= 1.e-3)
>> 397 {
>> 398 a10 = (1.+a1)*a5 ;
>> 399 bm = (a7*(1.+1.5*bet)-a10*xii)*G4Log(xi1)+xi*(a5-bet)/xi1+a10;
423 } else { 400 } else {
424 be[i] = 0.5*(3.0 - rho2[i] + 2.0*beta*(1 << 401 bm = (5.-a6+bet*a9)*(xi/2.);
425 } 402 }
426 403
427 if(xi[i] >= 0.001) { << 404 G4double fm = alm_crm*bm;
428 G4double a10 = (1.0 + 2.0 * beta) * (1.0 << 405 if ( fm < 0.) { fm = 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 } <<
434 } <<
435 <<
436 G4double sum = 0.0; <<
437 <<
438 for (G4int i = 0; i < NINTPAIR; ++i) { <<
439 G4double screen = screen0*xi1[i]/(1.0 - rh <<
440 G4double ale = G4Log(bbb/z13*std::sqrt(xi1 <<
441 G4double cre = 0.5*G4Log(1. + 2.25*z23*xi1 <<
442 406
443 G4double fe = (ale-cre)*be[i]; << 407 sum += wgi[i]*a4*(fe+fm/massratio2);
444 fe = std::max(fe, 0.0); <<
445 <<
446 G4double alm_crm = G4Log(bbb*massratio/(1. <<
447 G4double fm = std::max(alm_crm*bm[i], 0.0) <<
448 <<
449 sum += wgi[i]*(1.0 + rho[i])*(fe + fm); <<
450 } 408 }
451 409
452 return -tmn*sum*factorForCross*z2*residEnerg << 410 cross = -tmn*sum*factorForCross*z2*residEnergy/(totalEnergy*pairEnergy);
>> 411 if(cross < 0.0) { cross = 0.0; }
>> 412 return cross;
453 } 413 }
454 414
455 //....oooOO0OOooo........oooOO0OOooo........oo 415 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
456 416
457 G4double G4MuPairProductionModel::ComputeCross 417 G4double G4MuPairProductionModel::ComputeCrossSectionPerAtom(
458 con 418 const G4ParticleDefinition*,
459 419 G4double kineticEnergy,
460 420 G4double Z, G4double,
461 421 G4double cutEnergy,
462 422 G4double maxEnergy)
463 { 423 {
464 G4double cross = 0.0; 424 G4double cross = 0.0;
465 if (kineticEnergy <= lowestKinEnergy) { retu 425 if (kineticEnergy <= lowestKinEnergy) { return cross; }
466 426
467 G4double maxPairEnergy = MaxSecondaryEnergyF 427 G4double maxPairEnergy = MaxSecondaryEnergyForElement(kineticEnergy, Z);
468 G4double tmax = std::min(maxEnergy, maxPairE 428 G4double tmax = std::min(maxEnergy, maxPairEnergy);
469 G4double cut = std::max(cutEnergy, minPairE 429 G4double cut = std::max(cutEnergy, minPairEnergy);
470 if (cut >= tmax) { return cross; } 430 if (cut >= tmax) { return cross; }
471 431
472 cross = ComputeMicroscopicCrossSection(kinet 432 cross = ComputeMicroscopicCrossSection(kineticEnergy, Z, cut);
473 if(tmax < kineticEnergy) { 433 if(tmax < kineticEnergy) {
474 cross -= ComputeMicroscopicCrossSection(ki 434 cross -= ComputeMicroscopicCrossSection(kineticEnergy, Z, tmax);
475 } 435 }
476 return cross; 436 return cross;
477 } 437 }
478 438
479 //....oooOO0OOooo........oooOO0OOooo........oo 439 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
480 440
481 void G4MuPairProductionModel::MakeSamplingTabl 441 void G4MuPairProductionModel::MakeSamplingTables()
482 { 442 {
483 G4double factore = G4Exp(G4Log(emax/emin)/G4 443 G4double factore = G4Exp(G4Log(emax/emin)/G4double(nbine));
484 444
485 for (G4int iz=0; iz<NZDATPAIR; ++iz) { << 445 for (G4int iz=0; iz<nzdat; ++iz) {
486 446
487 G4double Z = ZDATPAIR[iz]; << 447 G4double Z = zdat[iz];
488 G4Physics2DVector* pv = new G4Physics2DVec 448 G4Physics2DVector* pv = new G4Physics2DVector(nbiny+1,nbine+1);
489 G4double kinEnergy = emin; 449 G4double kinEnergy = emin;
490 450
491 for (std::size_t it=0; it<=nbine; ++it) { << 451 for (size_t it=0; it<=nbine; ++it) {
492 452
493 pv->PutY(it, G4Log(kinEnergy/CLHEP::MeV) << 453 pv->PutY(it, G4Log(kinEnergy/MeV));
494 G4double maxPairEnergy = MaxSecondaryEne 454 G4double maxPairEnergy = MaxSecondaryEnergyForElement(kinEnergy, Z);
495 /* 455 /*
496 G4cout << "it= " << it << " E= " << kinE 456 G4cout << "it= " << it << " E= " << kinEnergy
497 << " " << particle->GetParticleN 457 << " " << particle->GetParticleName()
498 << " maxE= " << maxPairEnergy << 458 << " maxE= " << maxPairEnergy << " minE= " << minPairEnergy
499 << " ymin= " << ymin << G4endl; 459 << " ymin= " << ymin << G4endl;
500 */ 460 */
501 G4double coef = G4Log(minPairEnergy/kinE 461 G4double coef = G4Log(minPairEnergy/kinEnergy)/ymin;
502 G4double ymax = G4Log(maxPairEnergy/kinE 462 G4double ymax = G4Log(maxPairEnergy/kinEnergy)/coef;
503 G4double fac = (ymax - ymin)/dy; 463 G4double fac = (ymax - ymin)/dy;
504 std::size_t imax = (std::size_t)fac; << 464 size_t imax = (size_t)fac;
505 fac -= (G4double)imax; 465 fac -= (G4double)imax;
506 466
507 G4double xSec = 0.0; 467 G4double xSec = 0.0;
508 G4double x = ymin; 468 G4double x = ymin;
509 /* 469 /*
510 G4cout << "Z= " << currentZ << " z13= " 470 G4cout << "Z= " << currentZ << " z13= " << z13
511 << " mE= " << maxPairEnergy << " 471 << " mE= " << maxPairEnergy << " ymin= " << ymin
512 << " dy= " << dy << " c= " << co 472 << " dy= " << dy << " c= " << coef << G4endl;
513 */ 473 */
514 // start from zero 474 // start from zero
515 pv->PutValue(0, it, 0.0); 475 pv->PutValue(0, it, 0.0);
516 if(0 == it) { pv->PutX(nbiny, 0.0); } 476 if(0 == it) { pv->PutX(nbiny, 0.0); }
517 477
518 for (std::size_t i=0; i<nbiny; ++i) { << 478 for (size_t i=0; i<nbiny; ++i) {
519 479
520 if(0 == it) { pv->PutX(i, x); } 480 if(0 == it) { pv->PutX(i, x); }
521 481
522 if(i < imax) { 482 if(i < imax) {
523 G4double ep = kinEnergy*G4Exp(coef*( 483 G4double ep = kinEnergy*G4Exp(coef*(x + dy*0.5));
524 484
525 // not multiplied by interval, becau 485 // not multiplied by interval, because table
526 // will be used only for sampling 486 // will be used only for sampling
527 //G4cout << "i= " << i << " x= " << 487 //G4cout << "i= " << i << " x= " << x << "E= " << kinEnergy
528 // << " Egamma= " << ep << G 488 // << " Egamma= " << ep << G4endl;
529 xSec += ep*ComputeDMicroscopicCrossS 489 xSec += ep*ComputeDMicroscopicCrossSection(kinEnergy, Z, ep);
530 490
531 // last bin before the kinematic lim 491 // last bin before the kinematic limit
532 } else if(i == imax) { 492 } else if(i == imax) {
533 G4double ep = kinEnergy*G4Exp(coef*( 493 G4double ep = kinEnergy*G4Exp(coef*(x + fac*dy*0.5));
534 xSec += ep*fac*ComputeDMicroscopicCr 494 xSec += ep*fac*ComputeDMicroscopicCrossSection(kinEnergy, Z, ep);
535 } 495 }
536 pv->PutValue(i + 1, it, xSec); 496 pv->PutValue(i + 1, it, xSec);
537 x += dy; 497 x += dy;
538 } 498 }
539 kinEnergy *= factore; 499 kinEnergy *= factore;
540 500
541 // to avoid precision lost 501 // to avoid precision lost
542 if(it+1 == nbine) { kinEnergy = emax; } 502 if(it+1 == nbine) { kinEnergy = emax; }
543 } 503 }
544 fElementData->InitialiseForElement(iz, pv) << 504 fElementData->InitialiseForElement(zdat[iz], pv);
545 } 505 }
546 } 506 }
547 507
548 //....oooOO0OOooo........oooOO0OOooo........oo 508 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
549 509
550 void G4MuPairProductionModel::SampleSecondarie 510 void G4MuPairProductionModel::SampleSecondaries(
551 std::vector<G4Dy 511 std::vector<G4DynamicParticle*>* vdp,
552 const G4Material 512 const G4MaterialCutsCouple* couple,
553 const G4DynamicP 513 const G4DynamicParticle* aDynamicParticle,
554 G4double tmin, 514 G4double tmin,
555 G4double tmax) 515 G4double tmax)
556 { 516 {
557 G4double kinEnergy = aDynamicParticle->GetKi << 517 G4double kineticEnergy = aDynamicParticle->GetKineticEnergy();
558 //G4cout << "------- G4MuPairProductionModel 518 //G4cout << "------- G4MuPairProductionModel::SampleSecondaries E(MeV)= "
559 // << kinEnergy << " " << 519 // << kineticEnergy << " "
560 // << aDynamicParticle->GetDefinitio 520 // << aDynamicParticle->GetDefinition()->GetParticleName() << G4endl;
561 G4double totalEnergy = kinEnergy + particl << 521 G4double totalEnergy = kineticEnergy + particleMass;
562 G4double totalMomentum = 522 G4double totalMomentum =
563 std::sqrt(kinEnergy*(kinEnergy + 2.0*parti << 523 sqrt(kineticEnergy*(kineticEnergy + 2.0*particleMass));
564 524
565 G4ThreeVector partDirection = aDynamicPartic 525 G4ThreeVector partDirection = aDynamicParticle->GetMomentumDirection();
566 526
567 // select randomly one element constituing t 527 // select randomly one element constituing the material
568 const G4Element* anElement = SelectRandomAto << 528 const G4Element* anElement = SelectRandomAtom(couple,particle,kineticEnergy);
569 529
570 // define interval of energy transfer 530 // define interval of energy transfer
571 G4double maxPairEnergy = MaxSecondaryEnergyF << 531 G4double maxPairEnergy = MaxSecondaryEnergyForElement(kineticEnergy,
572 532 anElement->GetZ());
573 G4double maxEnergy = std::min(tmax, maxPairE << 533 G4double maxEnergy = std::min(tmax, maxPairEnergy);
574 G4double minEnergy = std::max(tmin, minPairE << 534 G4double minEnergy = std::max(tmin, minPairEnergy);
575 535
576 if (minEnergy >= maxEnergy) { return; } << 536 if(minEnergy >= maxEnergy) { return; }
577 //G4cout << "emin= " << minEnergy << " emax= 537 //G4cout << "emin= " << minEnergy << " emax= " << maxEnergy
578 // << " minPair= " << minPairEnergy << " max 538 // << " minPair= " << minPairEnergy << " maxpair= " << maxPairEnergy
579 // << " ymin= " << ymin << " dy= " << dy 539 // << " ymin= " << ymin << " dy= " << dy << G4endl;
580 540
581 G4double coeff = G4Log(minPairEnergy/kinEner << 541 G4double coeff = G4Log(minPairEnergy/kineticEnergy)/ymin;
582 542
583 // compute limits 543 // compute limits
584 G4double yymin = G4Log(minEnergy/kinEnergy)/ << 544 G4double yymin = G4Log(minEnergy/kineticEnergy)/coeff;
585 G4double yymax = G4Log(maxEnergy/kinEnergy)/ << 545 G4double yymax = G4Log(maxEnergy/kineticEnergy)/coeff;
586 546
587 //G4cout << "yymin= " << yymin << " yymax= 547 //G4cout << "yymin= " << yymin << " yymax= " << yymax << G4endl;
588 548
589 // units should not be used, bacause table w 549 // units should not be used, bacause table was built without
590 G4double logTkin = G4Log(kinEnergy/CLHEP::Me << 550 G4double logTkin = G4Log(kineticEnergy/MeV);
591 551
592 // sample e-e+ energy, pair energy first 552 // sample e-e+ energy, pair energy first
593 553
594 // select sample table via Z 554 // select sample table via Z
595 G4int iz1(0), iz2(0); 555 G4int iz1(0), iz2(0);
596 for (G4int iz=0; iz<NZDATPAIR; ++iz) { << 556 for(G4int iz=0; iz<nzdat; ++iz) {
597 if(currentZ == ZDATPAIR[iz]) { << 557 if(currentZ == zdat[iz]) {
598 iz1 = iz2 = iz; << 558 iz1 = iz2 = currentZ;
599 break; 559 break;
600 } else if(currentZ < ZDATPAIR[iz]) { << 560 } else if(currentZ < zdat[iz]) {
601 iz2 = iz; << 561 iz2 = zdat[iz];
602 if(iz > 0) { iz1 = iz-1; } << 562 if(iz > 0) { iz1 = zdat[iz-1]; }
603 else { iz1 = iz2; } 563 else { iz1 = iz2; }
604 break; 564 break;
605 } 565 }
606 } 566 }
607 if (0 == iz1) { iz1 = iz2 = NZDATPAIR-1; } << 567 if(0 == iz1) { iz1 = iz2 = zdat[nzdat-1]; }
608 568
609 G4double pairEnergy = 0.0; << 569 G4double PairEnergy = 0.0;
610 G4int count = 0; 570 G4int count = 0;
611 //G4cout << "start loop Z1= " << iz1 << " Z2 571 //G4cout << "start loop Z1= " << iz1 << " Z2= " << iz2 << G4endl;
612 do { 572 do {
613 ++count; 573 ++count;
614 // sampling using only one random number 574 // sampling using only one random number
615 G4double rand = G4UniformRand(); 575 G4double rand = G4UniformRand();
616 576
617 G4double x = FindScaledEnergy(iz1, rand, l 577 G4double x = FindScaledEnergy(iz1, rand, logTkin, yymin, yymax);
618 if(iz1 != iz2) { 578 if(iz1 != iz2) {
619 G4double x2 = FindScaledEnergy(iz2, rand 579 G4double x2 = FindScaledEnergy(iz2, rand, logTkin, yymin, yymax);
620 G4double lz1= nist->GetLOGZ(ZDATPAIR[iz1 << 580 G4double lz1= nist->GetLOGZ(iz1);
621 G4double lz2= nist->GetLOGZ(ZDATPAIR[iz2 << 581 G4double lz2= nist->GetLOGZ(iz2);
622 //G4cout << count << ". x= " << x << " 582 //G4cout << count << ". x= " << x << " x2= " << x2
623 // << " Z1= " << iz1 << " Z2 583 // << " Z1= " << iz1 << " Z2= " << iz2 << G4endl;
624 x += (x2 - x)*(lnZ - lz1)/(lz2 - lz1); 584 x += (x2 - x)*(lnZ - lz1)/(lz2 - lz1);
625 } 585 }
626 //G4cout << "x= " << x << " coeff= " << c 586 //G4cout << "x= " << x << " coeff= " << coeff << G4endl;
627 pairEnergy = kinEnergy*G4Exp(x*coeff); << 587 PairEnergy = kineticEnergy*G4Exp(x*coeff);
628 588
629 // Loop checking, 03-Aug-2015, Vladimir Iv 589 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
630 } while((pairEnergy < minEnergy || pairEnerg << 590 } while((PairEnergy < minEnergy || PairEnergy > maxEnergy) && 10 > count);
631 591
632 //G4cout << "## pairEnergy(GeV)= " << pairEn << 592 //G4cout << "## PairEnergy(GeV)= " << PairEnergy/GeV
633 // << " Etot(GeV)= " << totalEnergy/ 593 // << " Etot(GeV)= " << totalEnergy/GeV << G4endl;
634 594
635 // sample r=(E+-E-)/pairEnergy ( uniformly << 595 // sample r=(E+-E-)/PairEnergy ( uniformly .....)
636 G4double rmax = 596 G4double rmax =
637 (1.-6.*particleMass*particleMass/(totalEne << 597 (1.-6.*particleMass*particleMass/(totalEnergy*(totalEnergy-PairEnergy)))
638 *std::sqrt(1.-minPairEnergy/pairEnergy); << 598 *sqrt(1.-minPairEnergy/PairEnergy);
639 G4double r = rmax * (-1.+2.*G4UniformRand()) 599 G4double r = rmax * (-1.+2.*G4UniformRand()) ;
640 600
641 // compute energies from pairEnergy,r << 601 // compute energies from PairEnergy,r
642 G4double eEnergy = (1.-r)*pairEnergy*0.5; << 602 G4double ElectronEnergy = (1.-r)*PairEnergy*0.5;
643 G4double pEnergy = pairEnergy - eEnergy; << 603 G4double PositronEnergy = PairEnergy - ElectronEnergy;
644 << 604
645 // Sample angles << 605 // The angle of the emitted virtual photon is sampled
646 G4ThreeVector eDirection, pDirection; << 606 // according to the muon bremsstrahlung model
647 // << 607
648 GetAngularDistribution()->SamplePairDirectio << 608 G4double gam = totalEnergy/particleMass;
649 << 609 G4double gmax = gam*std::min(1.0, totalEnergy/PairEnergy - 1.0);
650 << 610 G4double gmax2= gmax*gmax;
651 // create G4DynamicParticle object for e+e- << 611 G4double x = G4UniformRand()*gmax2/(1.0 + gmax2);
652 eEnergy = std::max(eEnergy - CLHEP::electron << 612
653 pEnergy = std::max(pEnergy - CLHEP::electron << 613 G4double theta = sqrt(x/(1.0 - x))/gam;
654 auto aParticle1 = new G4DynamicParticle(theE << 614 G4double sint = sin(theta);
655 auto aParticle2 = new G4DynamicParticle(theP << 615 G4double phi = twopi * G4UniformRand() ;
656 // Fill output vector << 616 G4double dirx = sint*cos(phi), diry = sint*sin(phi), dirz = cos(theta) ;
657 vdp->push_back(aParticle1); << 617
658 vdp->push_back(aParticle2); << 618 G4ThreeVector gDirection(dirx, diry, dirz);
>> 619 gDirection.rotateUz(partDirection);
>> 620
>> 621 // the angles of e- and e+ assumed to be the same as virtual gamma
>> 622
>> 623 // create G4DynamicParticle object for the particle1
>> 624 G4DynamicParticle* aParticle1 =
>> 625 new G4DynamicParticle(theElectron, gDirection,
>> 626 ElectronEnergy - electron_mass_c2);
>> 627
>> 628 // create G4DynamicParticle object for the particle2
>> 629 G4DynamicParticle* aParticle2 =
>> 630 new G4DynamicParticle(thePositron, gDirection,
>> 631 PositronEnergy - electron_mass_c2);
659 632
660 // primary change 633 // primary change
661 kinEnergy -= pairEnergy; << 634 kineticEnergy -= (ElectronEnergy + PositronEnergy);
>> 635 fParticleChange->SetProposedKineticEnergy(kineticEnergy);
>> 636
662 partDirection *= totalMomentum; 637 partDirection *= totalMomentum;
663 partDirection -= (aParticle1->GetMomentum() 638 partDirection -= (aParticle1->GetMomentum() + aParticle2->GetMomentum());
664 partDirection = partDirection.unit(); 639 partDirection = partDirection.unit();
>> 640 fParticleChange->SetProposedMomentumDirection(partDirection);
665 641
666 // if energy transfer is higher than thresho << 642 // add secondary
667 // then stop tracking the primary particle a << 643 vdp->push_back(aParticle1);
668 if (pairEnergy > SecondaryThreshold()) { << 644 vdp->push_back(aParticle2);
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 645 //G4cout << "-- G4MuPairProductionModel::SampleSecondaries done" << G4endl;
678 } 646 }
679 647
680 //....oooOO0OOooo........oooOO0OOooo........oo 648 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
681 649
682 G4double << 650 void G4MuPairProductionModel::DataCorrupted(G4int Z, G4double logTkin)
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 <<
704 { 651 {
705 G4ExceptionDescription ed; 652 G4ExceptionDescription ed;
706 ed << "G4ElementData is not properly initial 653 ed << "G4ElementData is not properly initialized Z= " << Z
707 << " Ekin(MeV)= " << G4Exp(logTkin) 654 << " Ekin(MeV)= " << G4Exp(logTkin)
708 << " IsMasterThread= " << IsMaster() 655 << " IsMasterThread= " << IsMaster()
709 << " Model " << GetName(); 656 << " Model " << GetName();
710 G4Exception("G4MuPairProductionModel::()", " << 657 G4Exception("G4MuPairProductionModel::()","em0033",FatalException,
711 } << 658 ed,"");
712 <<
713 //....oooOO0OOooo........oooOO0OOooo........oo <<
714 <<
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 } 659 }
730 660
731 //....oooOO0OOooo........oooOO0OOooo........oo 661 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
732 662
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 } <<
750 663
751 //....oooOO0OOooo........oooOO0OOooo........oo <<
752 664