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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: G4MuBremsstrahlungModel 32 // File name: G4MuBremsstrahlungModel
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 PostStepDoIt (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 name (V.Ivanchenko) 44 // 13-02-03 Add name (V.Ivanchenko)
45 // 10-02-04 Add lowestKinEnergy (V.Ivanchenko) 45 // 10-02-04 Add lowestKinEnergy (V.Ivanchenko)
46 // 08-04-05 Major optimisation of internal int 46 // 08-04-05 Major optimisation of internal interfaces (V.Ivanchenko)
47 // 03-08-05 Angular correlations according to 47 // 03-08-05 Angular correlations according to PRM (V.Ivanchenko)
48 // 13-02-06 add ComputeCrossSectionPerAtom (mm 48 // 13-02-06 add ComputeCrossSectionPerAtom (mma)
49 // 21-03-06 Fix problem of initialisation in c 49 // 21-03-06 Fix problem of initialisation in case when cuts are not defined (VI)
50 // 07-11-07 Improve sampling of final state (A 50 // 07-11-07 Improve sampling of final state (A.Bogdanov)
51 // 28-02-08 Use precomputed Z^1/3 and Log(A) ( 51 // 28-02-08 Use precomputed Z^1/3 and Log(A) (V.Ivanchenko)
52 // 31-05-13 Use element selectors instead of l 52 // 31-05-13 Use element selectors instead of local data structure (V.Ivanchenko)
53 // 53 //
54 // ------------------------------------------- 54 // -------------------------------------------------------------------
55 // 55 //
56 //....oooOO0OOooo........oooOO0OOooo........oo 56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57 //....oooOO0OOooo........oooOO0OOooo........oo 57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
58 58
59 #include "G4MuBremsstrahlungModel.hh" 59 #include "G4MuBremsstrahlungModel.hh"
60 #include "G4PhysicalConstants.hh" 60 #include "G4PhysicalConstants.hh"
61 #include "G4SystemOfUnits.hh" 61 #include "G4SystemOfUnits.hh"
62 #include "G4Gamma.hh" 62 #include "G4Gamma.hh"
63 #include "G4MuonMinus.hh" 63 #include "G4MuonMinus.hh"
64 #include "G4MuonPlus.hh" 64 #include "G4MuonPlus.hh"
65 #include "Randomize.hh" 65 #include "Randomize.hh"
66 #include "G4Material.hh" 66 #include "G4Material.hh"
67 #include "G4Element.hh" 67 #include "G4Element.hh"
68 #include "G4ElementVector.hh" 68 #include "G4ElementVector.hh"
69 #include "G4ProductionCutsTable.hh" 69 #include "G4ProductionCutsTable.hh"
70 #include "G4ModifiedMephi.hh" 70 #include "G4ModifiedMephi.hh"
71 #include "G4ParticleChangeForLoss.hh" 71 #include "G4ParticleChangeForLoss.hh"
72 #include "G4Log.hh" 72 #include "G4Log.hh"
>> 73 #include "G4Exp.hh"
>> 74 #include "G4NistManager.hh"
73 75
74 //....oooOO0OOooo........oooOO0OOooo........oo 76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
75 //....oooOO0OOooo........oooOO0OOooo........oo 77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
76 78
>> 79 using namespace std;
>> 80
77 const G4double G4MuBremsstrahlungModel::xgi[] 81 const G4double G4MuBremsstrahlungModel::xgi[] =
78 {0.03377,0.16940,0.38069,0.61931,0.83060,0.9 82 {0.03377,0.16940,0.38069,0.61931,0.83060,0.96623};
79 const G4double G4MuBremsstrahlungModel::wgi[] 83 const G4double G4MuBremsstrahlungModel::wgi[] =
80 {0.08566,0.18038,0.23396,0.23396,0.18038,0.0 84 {0.08566,0.18038,0.23396,0.23396,0.18038,0.08566};
81 G4double G4MuBremsstrahlungModel::fDN[] = {0.0 85 G4double G4MuBremsstrahlungModel::fDN[] = {0.0};
>> 86 #ifdef G4MULTITHREADED
>> 87 G4Mutex G4MuBremsstrahlungModel::theMuBremMutex = G4MUTEX_INITIALIZER;
>> 88 #endif
82 89
83 G4MuBremsstrahlungModel::G4MuBremsstrahlungMod 90 G4MuBremsstrahlungModel::G4MuBremsstrahlungModel(const G4ParticleDefinition* p,
84 91 const G4String& nam)
85 : G4VEmModel(nam), 92 : G4VEmModel(nam),
86 sqrte(std::sqrt(G4Exp(1.))), << 93 sqrte(sqrt(G4Exp(1.))),
87 lowestKinEnergy(0.1*CLHEP::GeV), << 94 lowestKinEnergy(1.0*CLHEP::GeV),
88 minThreshold(0.9*CLHEP::keV) 95 minThreshold(0.9*CLHEP::keV)
89 { 96 {
90 theGamma = G4Gamma::Gamma(); 97 theGamma = G4Gamma::Gamma();
91 nist = G4NistManager::Instance(); 98 nist = G4NistManager::Instance();
92 99
93 SetAngularDistribution(new G4ModifiedMephi() << 100 if(0.0 == fDN[1]) {
94 << 101 #ifdef G4MULTITHREADED
95 if (nullptr != p) { SetParticle(p); } << 102 G4MUTEXLOCK(&theMuBremMutex);
96 if (0.0 == fDN[1]) { << 103 if(0.0 == fDN[1]) {
97 for (G4int i=1; i<93; ++i) { << 104 #endif
98 G4double dn = 1.54*nist->GetA27(i); << 105 for(G4int i=1; i<93; ++i) {
99 fDN[i] = dn; << 106 G4double dn = 1.54*nist->GetA27(i);
100 if(1 < i) { << 107 fDN[i] = dn;
101 fDN[i] /= std::pow(dn, 1./G4double(i)); << 108 if(1 < i) {
>> 109 fDN[i] /= std::pow(dn, 1./G4double(i));
>> 110 }
102 } 111 }
>> 112 #ifdef G4MULTITHREADED
103 } 113 }
>> 114 G4MUTEXUNLOCK(&theMuBremMutex);
>> 115 #endif
104 } 116 }
>> 117 SetAngularDistribution(new G4ModifiedMephi());
>> 118
>> 119 if(nullptr != p) { SetParticle(p); }
105 } 120 }
106 121
107 //....oooOO0OOooo........oooOO0OOooo........oo 122 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
108 123
109 G4double G4MuBremsstrahlungModel::MinEnergyCut 124 G4double G4MuBremsstrahlungModel::MinEnergyCut(const G4ParticleDefinition*,
110 125 const G4MaterialCutsCouple*)
111 { 126 {
112 return minThreshold; 127 return minThreshold;
113 } 128 }
114 129
115 //....oooOO0OOooo........oooOO0OOooo........oo 130 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
116 131
117 G4double G4MuBremsstrahlungModel::MinPrimaryEn 132 G4double G4MuBremsstrahlungModel::MinPrimaryEnergy(const G4Material*,
118 133 const G4ParticleDefinition*,
119 134 G4double cut)
120 { 135 {
121 return std::max(lowestKinEnergy, cut); << 136 return std::max(lowestKinEnergy,cut);
122 } <<
123 <<
124 //....oooOO0OOooo........oooOO0OOooo........oo <<
125 <<
126 void G4MuBremsstrahlungModel::SetParticle(cons <<
127 { <<
128 if(nullptr == particle) { <<
129 particle = p; <<
130 mass = particle->GetPDGMass(); <<
131 rmass = mass/CLHEP::electron_mass_c2 ; <<
132 cc = CLHEP::classic_electr_radius/rmass ; <<
133 coeff = 16.*CLHEP::fine_structure_const*cc <<
134 } <<
135 } 137 }
136 138
137 //....oooOO0OOooo........oooOO0OOooo........oo 139 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
138 140
139 void G4MuBremsstrahlungModel::Initialise(const 141 void G4MuBremsstrahlungModel::Initialise(const G4ParticleDefinition* p,
140 const 142 const G4DataVector& cuts)
141 { 143 {
142 SetParticle(p); 144 SetParticle(p);
>> 145
143 if(nullptr == fParticleChange) { 146 if(nullptr == fParticleChange) {
144 fParticleChange = GetParticleChangeForLoss 147 fParticleChange = GetParticleChangeForLoss();
145 } 148 }
>> 149
146 if(IsMaster() && p == particle && lowestKinE 150 if(IsMaster() && p == particle && lowestKinEnergy < HighEnergyLimit()) {
147 InitialiseElementSelectors(p, cuts); 151 InitialiseElementSelectors(p, cuts);
148 } 152 }
149 } 153 }
150 154
151 //....oooOO0OOooo........oooOO0OOooo........oo 155 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
152 156
153 void G4MuBremsstrahlungModel::InitialiseLocal( 157 void G4MuBremsstrahlungModel::InitialiseLocal(const G4ParticleDefinition* p,
154 158 G4VEmModel* masterModel)
155 { 159 {
156 if(p == particle && lowestKinEnergy < HighEn 160 if(p == particle && lowestKinEnergy < HighEnergyLimit()) {
157 SetElementSelectors(masterModel->GetElemen 161 SetElementSelectors(masterModel->GetElementSelectors());
158 } 162 }
159 } 163 }
160 164
161 //....oooOO0OOooo........oooOO0OOooo........oo 165 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
162 166
163 G4double G4MuBremsstrahlungModel::ComputeDEDXP 167 G4double G4MuBremsstrahlungModel::ComputeDEDXPerVolume(
164 168 const G4Material* material,
165 169 const G4ParticleDefinition*,
166 170 G4double kineticEnergy,
167 171 G4double cutEnergy)
168 { 172 {
169 G4double dedx = 0.0; 173 G4double dedx = 0.0;
170 if (kineticEnergy <= lowestKinEnergy) { retu 174 if (kineticEnergy <= lowestKinEnergy) { return dedx; }
171 175
172 G4double cut = std::max(cutEnergy, minThresh << 176 G4double tmax = kineticEnergy;
173 cut = std::min(cut, kineticEnergy); << 177 G4double cut = std::min(cutEnergy,tmax);
>> 178 if(cut < minThreshold) { cut = minThreshold; }
174 179
175 const G4ElementVector* theElementVector = ma 180 const G4ElementVector* theElementVector = material->GetElementVector();
176 const G4double* theAtomicNumDensityVector = 181 const G4double* theAtomicNumDensityVector =
177 material->GetAtomicNumDensityVector(); 182 material->GetAtomicNumDensityVector();
178 183
179 // loop for elements in the material 184 // loop for elements in the material
180 for (size_t i=0; i<material->GetNumberOfElem 185 for (size_t i=0; i<material->GetNumberOfElements(); ++i) {
>> 186
181 G4double loss = 187 G4double loss =
182 ComputMuBremLoss((*theElementVector)[i]- 188 ComputMuBremLoss((*theElementVector)[i]->GetZ(), kineticEnergy, cut);
>> 189
183 dedx += loss*theAtomicNumDensityVector[i]; 190 dedx += loss*theAtomicNumDensityVector[i];
184 } 191 }
185 // G4cout << "BR e= " << kineticEnergy << " 192 // G4cout << "BR e= " << kineticEnergy << " dedx= " << dedx << G4endl;
186 dedx = std::max(dedx, 0.); << 193 if(dedx < 0.) dedx = 0.;
187 return dedx; 194 return dedx;
188 } 195 }
189 196
190 //....oooOO0OOooo........oooOO0OOooo........oo 197 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
191 198
192 G4double G4MuBremsstrahlungModel::ComputMuBrem 199 G4double G4MuBremsstrahlungModel::ComputMuBremLoss(G4double Z,
193 200 G4double tkin, G4double cut)
194 { 201 {
195 G4double totalEnergy = mass + tkin; 202 G4double totalEnergy = mass + tkin;
196 static const G4double ak1 = 0.05; 203 static const G4double ak1 = 0.05;
197 static const G4int k2 = 5; << 204 static const G4int k2=5;
198 G4double loss = 0.; 205 G4double loss = 0.;
199 206
200 G4double vcut = cut/totalEnergy; 207 G4double vcut = cut/totalEnergy;
201 G4int kkk = (G4int)(vcut/ak1) + k2; << 208 G4double vmax = tkin/totalEnergy;
202 if (kkk > 8) { kkk = 8; } << 209
203 else if (kkk < 1) { kkk = 1; } << 210 G4double aaa = 0.;
204 G4double hhh = vcut/(G4double)(kkk); << 211 G4double bbb = vcut;
205 << 212 if(vcut>vmax) { bbb = vmax; }
206 G4double aa = 0.; << 213 G4int kkk = (G4int)((bbb-aaa)/ak1)+k2;
207 for(G4int l=0; l<kkk; ++l) { << 214 if(kkk < 1) { kkk = 1; }
208 for(G4int i=0; i<6; ++i) { << 215
>> 216 G4double hhh=(bbb-aaa)/G4double(kkk);
>> 217
>> 218 G4double aa = aaa;
>> 219 for(G4int l=0; l<kkk; l++)
>> 220 {
>> 221 for(G4int i=0; i<6; i++)
>> 222 {
209 G4double ep = (aa + xgi[i]*hhh)*totalEne 223 G4double ep = (aa + xgi[i]*hhh)*totalEnergy;
210 loss += ep*wgi[i]*ComputeDMicroscopicCro 224 loss += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
211 } 225 }
212 aa += hhh; 226 aa += hhh;
213 } 227 }
214 228
215 loss *= hhh*totalEnergy; << 229 loss *=hhh*totalEnergy ;
>> 230
216 return loss; 231 return loss;
217 } 232 }
218 233
219 //....oooOO0OOooo........oooOO0OOooo........oo 234 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
220 235
221 G4double G4MuBremsstrahlungModel::ComputeMicro 236 G4double G4MuBremsstrahlungModel::ComputeMicroscopicCrossSection(
222 G4d 237 G4double tkin,
223 G4d 238 G4double Z,
224 G4d 239 G4double cut)
225 { 240 {
226 G4double totalEnergy = tkin + mass; 241 G4double totalEnergy = tkin + mass;
227 static const G4double ak1 = 2.3; 242 static const G4double ak1 = 2.3;
228 static const G4int k2 = 4; << 243 static const G4int k2 = 4;
229 G4double cross = 0.; 244 G4double cross = 0.;
230 245
231 if(cut >= tkin) return cross; 246 if(cut >= tkin) return cross;
232 247
233 G4double vcut = cut/totalEnergy; 248 G4double vcut = cut/totalEnergy;
234 G4double vmax = tkin/totalEnergy; 249 G4double vmax = tkin/totalEnergy;
235 250
236 G4double aaa = G4Log(vcut); 251 G4double aaa = G4Log(vcut);
237 G4double bbb = G4Log(vmax); 252 G4double bbb = G4Log(vmax);
238 G4int kkk = (G4int)((bbb-aaa)/ak1) + k2 ; << 253 G4int kkk = (G4int)((bbb-aaa)/ak1)+k2 ;
239 if(kkk > 8) { kkk = 8; } << 254 if(kkk < 1) { kkk = 1; }
240 else if (kkk < 1) { kkk = 1; } << 255
241 G4double hhh = (bbb-aaa)/(G4double)(kkk); << 256 G4double hhh = (bbb-aaa)/G4double(kkk);
>> 257
242 G4double aa = aaa; 258 G4double aa = aaa;
243 259
244 for(G4int l=0; l<kkk; ++l) { << 260 for(G4int l=0; l<kkk; ++l)
245 for(G4int i=0; i<6; ++i) { << 261 {
>> 262 for(G4int i=0; i<6; ++i)
>> 263 {
246 G4double ep = G4Exp(aa + xgi[i]*hhh)*tot 264 G4double ep = G4Exp(aa + xgi[i]*hhh)*totalEnergy;
247 cross += ep*wgi[i]*ComputeDMicroscopicCr 265 cross += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
248 } 266 }
249 aa += hhh; 267 aa += hhh;
250 } 268 }
251 269
252 cross *= hhh; << 270 cross *=hhh;
>> 271
253 //G4cout << "BR e= " << tkin<< " cross= " < 272 //G4cout << "BR e= " << tkin<< " cross= " << cross/barn << G4endl;
>> 273
254 return cross; 274 return cross;
255 } 275 }
256 276
257 //....oooOO0OOooo........oooOO0OOooo........oo 277 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
258 278
259 G4double G4MuBremsstrahlungModel::ComputeDMicr 279 G4double G4MuBremsstrahlungModel::ComputeDMicroscopicCrossSection(
260 G4d 280 G4double tkin,
261 G4d 281 G4double Z,
262 G4d 282 G4double gammaEnergy)
263 // differential cross section 283 // differential cross section
264 { 284 {
265 G4double dxsection = 0.; 285 G4double dxsection = 0.;
>> 286
266 if(gammaEnergy > tkin) { return dxsection; } 287 if(gammaEnergy > tkin) { return dxsection; }
267 288
268 G4double E = tkin + mass ; 289 G4double E = tkin + mass ;
269 G4double v = gammaEnergy/E ; 290 G4double v = gammaEnergy/E ;
270 G4double delta = 0.5*mass*mass*v/(E-gammaEne 291 G4double delta = 0.5*mass*mass*v/(E-gammaEnergy) ;
271 G4double rab0 = delta*sqrte ; 292 G4double rab0 = delta*sqrte ;
272 293
273 G4int iz = G4lrint(Z); 294 G4int iz = G4lrint(Z);
274 if(iz < 1) { iz = 1; } 295 if(iz < 1) { iz = 1; }
275 else if(iz > 92) { iz = 92; } 296 else if(iz > 92) { iz = 92; }
276 297
277 G4double z13 = 1.0/nist->GetZ13(iz); 298 G4double z13 = 1.0/nist->GetZ13(iz);
278 G4double dnstar = fDN[iz]; 299 G4double dnstar = fDN[iz];
279 300
280 G4double b,b1; 301 G4double b,b1;
>> 302
281 if(1 == iz) { 303 if(1 == iz) {
282 b = bh; 304 b = bh;
283 b1 = bh1; 305 b1 = bh1;
284 } else { 306 } else {
285 b = btf; 307 b = btf;
286 b1 = btf1; 308 b1 = btf1;
287 } 309 }
288 310
289 // nucleus contribution logarithm 311 // nucleus contribution logarithm
290 G4double rab1 = b*z13; << 312 G4double rab1=b*z13;
291 G4double fn = G4Log(rab1/(dnstar*(CLHEP::ele << 313 G4double fn=G4Log(rab1/(dnstar*(electron_mass_c2+rab0*rab1))*
292 (mass + delta*(dnstar*sqrte-2.))); << 314 (mass+delta*(dnstar*sqrte-2.))) ;
293 fn = std::max(fn, 0.); << 315 if(fn <0.) { fn = 0.; }
294 // electron contribution logarithm 316 // electron contribution logarithm
295 G4double epmax1 = E/(1.+0.5*mass*rmass/E); << 317 G4double epmax1=E/(1.+0.5*mass*rmass/E) ;
296 G4double fe = 0.; << 318 G4double fe=0.;
297 if(gammaEnergy < epmax1) { << 319 if(gammaEnergy<epmax1)
298 G4double rab2 = b1*z13*z13; << 320 {
299 fe = G4Log(rab2*mass/((1.+delta*rmass/(CLH << 321 G4double rab2=b1*z13*z13 ;
300 (CLHEP::electron_mass_c2+rab0*rab2))); << 322 fe=G4Log(rab2*mass/((1.+delta*rmass/(electron_mass_c2*sqrte))*
301 fe = std::max(fe, 0.); << 323 (electron_mass_c2+rab0*rab2))) ;
>> 324 if(fe<0.) { fe=0.; }
302 } 325 }
303 326
304 dxsection = coeff*(1.-v*(1. - 0.75*v))*Z*(fn 327 dxsection = coeff*(1.-v*(1. - 0.75*v))*Z*(fn*Z + fe)/gammaEnergy;
305 dxsection = std::max(dxsection, 0.0); << 328
306 return dxsection; 329 return dxsection;
307 } 330 }
308 331
309 //....oooOO0OOooo........oooOO0OOooo........oo 332 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
310 333
311 G4double G4MuBremsstrahlungModel::ComputeCross 334 G4double G4MuBremsstrahlungModel::ComputeCrossSectionPerAtom(
312 con 335 const G4ParticleDefinition*,
313 336 G4double kineticEnergy,
314 337 G4double Z, G4double,
315 338 G4double cutEnergy,
316 339 G4double maxEnergy)
317 { 340 {
318 G4double cross = 0.0; 341 G4double cross = 0.0;
319 if (kineticEnergy <= lowestKinEnergy) return 342 if (kineticEnergy <= lowestKinEnergy) return cross;
320 G4double tmax = std::min(maxEnergy, kineticE 343 G4double tmax = std::min(maxEnergy, kineticEnergy);
321 G4double cut = std::min(cutEnergy, kineticE 344 G4double cut = std::min(cutEnergy, kineticEnergy);
322 if (cut < minThreshold) cut = minThreshold; << 345 if(cut < minThreshold) cut = minThreshold;
323 if (cut >= tmax) return cross; 346 if (cut >= tmax) return cross;
324 347
325 cross = ComputeMicroscopicCrossSection (kine 348 cross = ComputeMicroscopicCrossSection (kineticEnergy, Z, cut);
326 if(tmax < kineticEnergy) { 349 if(tmax < kineticEnergy) {
327 cross -= ComputeMicroscopicCrossSection(ki 350 cross -= ComputeMicroscopicCrossSection(kineticEnergy, Z, tmax);
328 } 351 }
329 return cross; 352 return cross;
330 } 353 }
331 354
332 //....oooOO0OOooo........oooOO0OOooo........oo 355 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
333 356
334 void G4MuBremsstrahlungModel::SampleSecondarie 357 void G4MuBremsstrahlungModel::SampleSecondaries(
335 std::vector<G4Dy 358 std::vector<G4DynamicParticle*>* vdp,
336 const G4Material 359 const G4MaterialCutsCouple* couple,
337 const G4DynamicP 360 const G4DynamicParticle* dp,
338 G4double minEner 361 G4double minEnergy,
339 G4double maxEner 362 G4double maxEnergy)
340 { 363 {
341 G4double kineticEnergy = dp->GetKineticEnerg 364 G4double kineticEnergy = dp->GetKineticEnergy();
342 // check against insufficient energy 365 // check against insufficient energy
343 G4double tmax = std::min(kineticEnergy, maxE 366 G4double tmax = std::min(kineticEnergy, maxEnergy);
344 G4double tmin = std::min(kineticEnergy, minE 367 G4double tmin = std::min(kineticEnergy, minEnergy);
345 tmin = std::max(tmin, minThreshold); << 368 if(tmin < minThreshold) tmin = minThreshold;
346 if(tmin >= tmax) return; 369 if(tmin >= tmax) return;
347 370
348 // ===== sampling of energy transfer ====== 371 // ===== sampling of energy transfer ======
349 372
350 G4ParticleMomentum partDirection = dp->GetMo 373 G4ParticleMomentum partDirection = dp->GetMomentumDirection();
351 374
352 // select randomly one element constituing t 375 // select randomly one element constituing the material
353 const G4Element* anElement = SelectRandomAto 376 const G4Element* anElement = SelectRandomAtom(couple,particle,kineticEnergy);
354 G4double Z = anElement->GetZ(); 377 G4double Z = anElement->GetZ();
>> 378
355 G4double func1 = tmin* 379 G4double func1 = tmin*
356 ComputeDMicroscopicCrossSection(kineticEne << 380 ComputeDMicroscopicCrossSection(kineticEnergy,Z,tmin);
357 381
358 G4double gEnergy; << 382 G4double lnepksi, epksi;
359 G4double func2; 383 G4double func2;
360 384
361 G4double xmin = G4Log(tmin/minThreshold); << 385 G4double xmin = G4Log(tmin/CLHEP::MeV);
362 G4double xmax = G4Log(tmax/tmin); << 386 G4double xmax = G4Log(kineticEnergy/tmin);
363 387
364 do { 388 do {
365 gEnergy = minThreshold*G4Exp(xmin + G4Unif << 389 lnepksi = xmin + G4UniformRand()*xmax;
366 func2 = gEnergy*ComputeDMicroscopicCrossSe << 390 epksi = CLHEP::MeV*G4Exp(lnepksi);
367 << 391 func2 = epksi*ComputeDMicroscopicCrossSection(kineticEnergy,Z,epksi);
>> 392
368 // Loop checking, 03-Aug-2015, Vladimir Iv 393 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
369 } while(func2 < func1*G4UniformRand()); 394 } while(func2 < func1*G4UniformRand());
370 395
>> 396 G4double gEnergy = epksi;
>> 397
>> 398 // ===== sample angle =====
>> 399
>> 400 //
371 // angles of the emitted gamma using general 401 // angles of the emitted gamma using general interface
>> 402
372 G4ThreeVector gamDir = 403 G4ThreeVector gamDir =
373 GetAngularDistribution()->SampleDirection( 404 GetAngularDistribution()->SampleDirection(dp, gEnergy, Z,
374 405 couple->GetMaterial());
375 // create G4DynamicParticle object for the G 406 // create G4DynamicParticle object for the Gamma
376 G4DynamicParticle* gamma = new G4DynamicPart 407 G4DynamicParticle* gamma = new G4DynamicParticle(theGamma, gamDir, gEnergy);
377 vdp->push_back(gamma); 408 vdp->push_back(gamma);
378 <<
379 // compute post-interaction kinematics of pr 409 // compute post-interaction kinematics of primary e-/e+ based on
380 // energy-momentum conservation 410 // energy-momentum conservation
381 const G4double totMomentum = 411 const G4double totMomentum =
382 std::sqrt(kineticEnergy*(kineticEnergy + 2 412 std::sqrt(kineticEnergy*(kineticEnergy + 2.0*mass));
383 G4ThreeVector dir = 413 G4ThreeVector dir =
384 (totMomentum*dp->GetMomentumDirection() - << 414 (totMomentum*dp->GetMomentumDirection()-gEnergy*gamDir).unit();
385 const G4double finalE = kineticEnergy - gEne 415 const G4double finalE = kineticEnergy - gEnergy;
386 <<
387 // if secondary gamma energy is higher than 416 // if secondary gamma energy is higher than threshold(very high by default)
388 // then stop tracking the primary particle a 417 // then stop tracking the primary particle and create new secondary e-/e+
389 // instead of the primary one 418 // instead of the primary one
390 if (gEnergy > SecondaryThreshold()) { 419 if (gEnergy > SecondaryThreshold()) {
391 fParticleChange->ProposeTrackStatus(fStopA 420 fParticleChange->ProposeTrackStatus(fStopAndKill);
392 fParticleChange->SetProposedKineticEnergy( 421 fParticleChange->SetProposedKineticEnergy(0.0);
393 G4DynamicParticle* newdp = new G4DynamicPa 422 G4DynamicParticle* newdp = new G4DynamicParticle(particle, dir, finalE);
394 vdp->push_back(newdp); 423 vdp->push_back(newdp);
395 } else { << 424 } else { // continue tracking the primary e-/e+ otherwise
396 // continue tracking the primary e-/e+ oth <<
397 fParticleChange->SetProposedMomentumDirect 425 fParticleChange->SetProposedMomentumDirection(dir);
398 fParticleChange->SetProposedKineticEnergy( 426 fParticleChange->SetProposedKineticEnergy(finalE);
399 } 427 }
400 } 428 }
401 429
402 //....oooOO0OOooo........oooOO0OOooo........oo 430 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
403 431