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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
>> 55 //
>> 56 // Class Description:
>> 57 //
>> 58 //
54 // ------------------------------------------- 59 // -------------------------------------------------------------------
55 // 60 //
56 //....oooOO0OOooo........oooOO0OOooo........oo 61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57 //....oooOO0OOooo........oooOO0OOooo........oo 62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
58 63
59 #include "G4MuBremsstrahlungModel.hh" 64 #include "G4MuBremsstrahlungModel.hh"
60 #include "G4PhysicalConstants.hh" 65 #include "G4PhysicalConstants.hh"
61 #include "G4SystemOfUnits.hh" 66 #include "G4SystemOfUnits.hh"
62 #include "G4Gamma.hh" 67 #include "G4Gamma.hh"
63 #include "G4MuonMinus.hh" 68 #include "G4MuonMinus.hh"
64 #include "G4MuonPlus.hh" 69 #include "G4MuonPlus.hh"
65 #include "Randomize.hh" 70 #include "Randomize.hh"
66 #include "G4Material.hh" 71 #include "G4Material.hh"
67 #include "G4Element.hh" 72 #include "G4Element.hh"
68 #include "G4ElementVector.hh" 73 #include "G4ElementVector.hh"
69 #include "G4ProductionCutsTable.hh" 74 #include "G4ProductionCutsTable.hh"
70 #include "G4ModifiedMephi.hh" 75 #include "G4ModifiedMephi.hh"
71 #include "G4ParticleChangeForLoss.hh" 76 #include "G4ParticleChangeForLoss.hh"
72 #include "G4Log.hh" 77 #include "G4Log.hh"
>> 78 #include "G4Exp.hh"
73 79
74 //....oooOO0OOooo........oooOO0OOooo........oo 80 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
75 //....oooOO0OOooo........oooOO0OOooo........oo 81 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
76 82
>> 83 using namespace std;
>> 84
77 const G4double G4MuBremsstrahlungModel::xgi[] 85 const G4double G4MuBremsstrahlungModel::xgi[] =
78 {0.03377,0.16940,0.38069,0.61931,0.83060,0.9 86 {0.03377,0.16940,0.38069,0.61931,0.83060,0.96623};
79 const G4double G4MuBremsstrahlungModel::wgi[] 87 const G4double G4MuBremsstrahlungModel::wgi[] =
80 {0.08566,0.18038,0.23396,0.23396,0.18038,0.0 88 {0.08566,0.18038,0.23396,0.23396,0.18038,0.08566};
81 G4double G4MuBremsstrahlungModel::fDN[] = {0.0 89 G4double G4MuBremsstrahlungModel::fDN[] = {0.0};
82 90
83 G4MuBremsstrahlungModel::G4MuBremsstrahlungMod 91 G4MuBremsstrahlungModel::G4MuBremsstrahlungModel(const G4ParticleDefinition* p,
84 92 const G4String& nam)
85 : G4VEmModel(nam), 93 : G4VEmModel(nam),
86 sqrte(std::sqrt(G4Exp(1.))), << 94 particle(nullptr),
87 lowestKinEnergy(0.1*CLHEP::GeV), << 95 sqrte(sqrt(G4Exp(1.))),
88 minThreshold(0.9*CLHEP::keV) << 96 bh(202.4),
>> 97 bh1(446.),
>> 98 btf(183.),
>> 99 btf1(1429.),
>> 100 fParticleChange(nullptr),
>> 101 lowestKinEnergy(1.0*GeV),
>> 102 minThreshold(0.9*keV)
89 { 103 {
90 theGamma = G4Gamma::Gamma(); 104 theGamma = G4Gamma::Gamma();
91 nist = G4NistManager::Instance(); << 105 nist = G4NistManager::Instance();
92 106
93 SetAngularDistribution(new G4ModifiedMephi() << 107 lowestKinEnergy = 1.*GeV;
94 108
95 if (nullptr != p) { SetParticle(p); } << 109 mass = rmass = cc = coeff = 1.0;
96 if (0.0 == fDN[1]) { << 110
97 for (G4int i=1; i<93; ++i) { << 111 if(0.0 == fDN[1]) {
>> 112 for(G4int i=1; i<93; ++i) {
98 G4double dn = 1.54*nist->GetA27(i); 113 G4double dn = 1.54*nist->GetA27(i);
99 fDN[i] = dn; 114 fDN[i] = dn;
100 if(1 < i) { 115 if(1 < i) {
101 fDN[i] /= std::pow(dn, 1./G4double(i)); << 116 fDN[i] /= std::pow(dn, 1./G4double(i));
102 } 117 }
103 } 118 }
104 } 119 }
>> 120 SetAngularDistribution(new G4ModifiedMephi());
>> 121
>> 122 if(p) { SetParticle(p); }
105 } 123 }
106 124
107 //....oooOO0OOooo........oooOO0OOooo........oo 125 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
108 126
109 G4double G4MuBremsstrahlungModel::MinEnergyCut 127 G4double G4MuBremsstrahlungModel::MinEnergyCut(const G4ParticleDefinition*,
110 128 const G4MaterialCutsCouple*)
111 { 129 {
112 return minThreshold; 130 return minThreshold;
113 } 131 }
114 132
115 //....oooOO0OOooo........oooOO0OOooo........oo 133 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
116 134
117 G4double G4MuBremsstrahlungModel::MinPrimaryEn 135 G4double G4MuBremsstrahlungModel::MinPrimaryEnergy(const G4Material*,
118 136 const G4ParticleDefinition*,
119 137 G4double cut)
120 { 138 {
121 return std::max(lowestKinEnergy, cut); << 139 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 } 140 }
136 141
137 //....oooOO0OOooo........oooOO0OOooo........oo 142 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
138 143
139 void G4MuBremsstrahlungModel::Initialise(const 144 void G4MuBremsstrahlungModel::Initialise(const G4ParticleDefinition* p,
140 const 145 const G4DataVector& cuts)
141 { 146 {
142 SetParticle(p); << 147 if(p) { SetParticle(p); }
143 if(nullptr == fParticleChange) { << 148
144 fParticleChange = GetParticleChangeForLoss << 149 // define pointer to G4ParticleChange
145 } << 150 if(!fParticleChange) { fParticleChange = GetParticleChangeForLoss(); }
>> 151
146 if(IsMaster() && p == particle && lowestKinE 152 if(IsMaster() && p == particle && lowestKinEnergy < HighEnergyLimit()) {
147 InitialiseElementSelectors(p, cuts); 153 InitialiseElementSelectors(p, cuts);
148 } 154 }
149 } 155 }
150 156
151 //....oooOO0OOooo........oooOO0OOooo........oo 157 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
152 158
153 void G4MuBremsstrahlungModel::InitialiseLocal( 159 void G4MuBremsstrahlungModel::InitialiseLocal(const G4ParticleDefinition* p,
154 160 G4VEmModel* masterModel)
155 { 161 {
156 if(p == particle && lowestKinEnergy < HighEn 162 if(p == particle && lowestKinEnergy < HighEnergyLimit()) {
157 SetElementSelectors(masterModel->GetElemen 163 SetElementSelectors(masterModel->GetElementSelectors());
158 } 164 }
159 } 165 }
160 166
161 //....oooOO0OOooo........oooOO0OOooo........oo 167 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
162 168
163 G4double G4MuBremsstrahlungModel::ComputeDEDXP 169 G4double G4MuBremsstrahlungModel::ComputeDEDXPerVolume(
164 170 const G4Material* material,
165 171 const G4ParticleDefinition*,
166 172 G4double kineticEnergy,
167 173 G4double cutEnergy)
168 { 174 {
169 G4double dedx = 0.0; 175 G4double dedx = 0.0;
170 if (kineticEnergy <= lowestKinEnergy) { retu 176 if (kineticEnergy <= lowestKinEnergy) { return dedx; }
171 177
172 G4double cut = std::max(cutEnergy, minThresh << 178 G4double tmax = kineticEnergy;
173 cut = std::min(cut, kineticEnergy); << 179 G4double cut = std::min(cutEnergy,tmax);
>> 180 if(cut < minThreshold) { cut = minThreshold; }
174 181
175 const G4ElementVector* theElementVector = ma 182 const G4ElementVector* theElementVector = material->GetElementVector();
176 const G4double* theAtomicNumDensityVector = 183 const G4double* theAtomicNumDensityVector =
177 material->GetAtomicNumDensityVector(); 184 material->GetAtomicNumDensityVector();
178 185
179 // loop for elements in the material 186 // loop for elements in the material
180 for (size_t i=0; i<material->GetNumberOfElem << 187 for (size_t i=0; i<material->GetNumberOfElements(); i++) {
>> 188
181 G4double loss = 189 G4double loss =
182 ComputMuBremLoss((*theElementVector)[i]- 190 ComputMuBremLoss((*theElementVector)[i]->GetZ(), kineticEnergy, cut);
>> 191
183 dedx += loss*theAtomicNumDensityVector[i]; 192 dedx += loss*theAtomicNumDensityVector[i];
184 } 193 }
185 // G4cout << "BR e= " << kineticEnergy << " 194 // G4cout << "BR e= " << kineticEnergy << " dedx= " << dedx << G4endl;
186 dedx = std::max(dedx, 0.); << 195 if(dedx < 0.) dedx = 0.;
187 return dedx; 196 return dedx;
188 } 197 }
189 198
190 //....oooOO0OOooo........oooOO0OOooo........oo 199 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
191 200
192 G4double G4MuBremsstrahlungModel::ComputMuBrem 201 G4double G4MuBremsstrahlungModel::ComputMuBremLoss(G4double Z,
193 202 G4double tkin, G4double cut)
194 { 203 {
195 G4double totalEnergy = mass + tkin; 204 G4double totalEnergy = mass + tkin;
196 static const G4double ak1 = 0.05; 205 static const G4double ak1 = 0.05;
197 static const G4int k2 = 5; << 206 static const G4int k2=5;
198 G4double loss = 0.; 207 G4double loss = 0.;
199 208
200 G4double vcut = cut/totalEnergy; 209 G4double vcut = cut/totalEnergy;
201 G4int kkk = (G4int)(vcut/ak1) + k2; << 210 G4double vmax = tkin/totalEnergy;
202 if (kkk > 8) { kkk = 8; } << 211
203 else if (kkk < 1) { kkk = 1; } << 212 G4double aaa = 0.;
204 G4double hhh = vcut/(G4double)(kkk); << 213 G4double bbb = vcut;
205 << 214 if(vcut>vmax) { bbb = vmax; }
206 G4double aa = 0.; << 215 G4int kkk = (G4int)((bbb-aaa)/ak1)+k2;
207 for(G4int l=0; l<kkk; ++l) { << 216 if(kkk < 1) { kkk = 1; }
208 for(G4int i=0; i<6; ++i) { << 217
>> 218 G4double hhh=(bbb-aaa)/G4double(kkk);
>> 219
>> 220 G4double aa = aaa;
>> 221 for(G4int l=0; l<kkk; l++)
>> 222 {
>> 223 for(G4int i=0; i<6; i++)
>> 224 {
209 G4double ep = (aa + xgi[i]*hhh)*totalEne 225 G4double ep = (aa + xgi[i]*hhh)*totalEnergy;
210 loss += ep*wgi[i]*ComputeDMicroscopicCro 226 loss += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
211 } 227 }
212 aa += hhh; 228 aa += hhh;
213 } 229 }
214 230
215 loss *= hhh*totalEnergy; << 231 loss *=hhh*totalEnergy ;
>> 232
216 return loss; 233 return loss;
217 } 234 }
218 235
219 //....oooOO0OOooo........oooOO0OOooo........oo 236 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
220 237
221 G4double G4MuBremsstrahlungModel::ComputeMicro 238 G4double G4MuBremsstrahlungModel::ComputeMicroscopicCrossSection(
222 G4d 239 G4double tkin,
223 G4d 240 G4double Z,
224 G4d 241 G4double cut)
225 { 242 {
226 G4double totalEnergy = tkin + mass; 243 G4double totalEnergy = tkin + mass;
227 static const G4double ak1 = 2.3; 244 static const G4double ak1 = 2.3;
228 static const G4int k2 = 4; << 245 static const G4int k2 = 4;
229 G4double cross = 0.; 246 G4double cross = 0.;
230 247
231 if(cut >= tkin) return cross; 248 if(cut >= tkin) return cross;
232 249
233 G4double vcut = cut/totalEnergy; 250 G4double vcut = cut/totalEnergy;
234 G4double vmax = tkin/totalEnergy; 251 G4double vmax = tkin/totalEnergy;
235 252
236 G4double aaa = G4Log(vcut); 253 G4double aaa = G4Log(vcut);
237 G4double bbb = G4Log(vmax); 254 G4double bbb = G4Log(vmax);
238 G4int kkk = (G4int)((bbb-aaa)/ak1) + k2 ; << 255 G4int kkk = (G4int)((bbb-aaa)/ak1)+k2 ;
239 if(kkk > 8) { kkk = 8; } << 256 if(kkk < 1) { kkk = 1; }
240 else if (kkk < 1) { kkk = 1; } << 257
241 G4double hhh = (bbb-aaa)/(G4double)(kkk); << 258 G4double hhh = (bbb-aaa)/G4double(kkk);
>> 259
242 G4double aa = aaa; 260 G4double aa = aaa;
243 261
244 for(G4int l=0; l<kkk; ++l) { << 262 for(G4int l=0; l<kkk; l++)
245 for(G4int i=0; i<6; ++i) { << 263 {
>> 264 for(G4int i=0; i<6; i++)
>> 265 {
246 G4double ep = G4Exp(aa + xgi[i]*hhh)*tot 266 G4double ep = G4Exp(aa + xgi[i]*hhh)*totalEnergy;
247 cross += ep*wgi[i]*ComputeDMicroscopicCr 267 cross += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
248 } 268 }
249 aa += hhh; 269 aa += hhh;
250 } 270 }
251 271
252 cross *= hhh; << 272 cross *=hhh;
>> 273
253 //G4cout << "BR e= " << tkin<< " cross= " < 274 //G4cout << "BR e= " << tkin<< " cross= " << cross/barn << G4endl;
>> 275
254 return cross; 276 return cross;
255 } 277 }
256 278
257 //....oooOO0OOooo........oooOO0OOooo........oo 279 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
258 280
259 G4double G4MuBremsstrahlungModel::ComputeDMicr 281 G4double G4MuBremsstrahlungModel::ComputeDMicroscopicCrossSection(
260 G4d 282 G4double tkin,
261 G4d 283 G4double Z,
262 G4d 284 G4double gammaEnergy)
263 // differential cross section 285 // differential cross section
264 { 286 {
265 G4double dxsection = 0.; 287 G4double dxsection = 0.;
>> 288
266 if(gammaEnergy > tkin) { return dxsection; } 289 if(gammaEnergy > tkin) { return dxsection; }
267 290
268 G4double E = tkin + mass ; 291 G4double E = tkin + mass ;
269 G4double v = gammaEnergy/E ; 292 G4double v = gammaEnergy/E ;
270 G4double delta = 0.5*mass*mass*v/(E-gammaEne 293 G4double delta = 0.5*mass*mass*v/(E-gammaEnergy) ;
271 G4double rab0 = delta*sqrte ; 294 G4double rab0 = delta*sqrte ;
272 295
273 G4int iz = G4lrint(Z); 296 G4int iz = G4lrint(Z);
274 if(iz < 1) { iz = 1; } 297 if(iz < 1) { iz = 1; }
275 else if(iz > 92) { iz = 92; } 298 else if(iz > 92) { iz = 92; }
276 299
277 G4double z13 = 1.0/nist->GetZ13(iz); 300 G4double z13 = 1.0/nist->GetZ13(iz);
278 G4double dnstar = fDN[iz]; 301 G4double dnstar = fDN[iz];
279 302
280 G4double b,b1; 303 G4double b,b1;
>> 304
281 if(1 == iz) { 305 if(1 == iz) {
282 b = bh; 306 b = bh;
283 b1 = bh1; 307 b1 = bh1;
284 } else { 308 } else {
285 b = btf; 309 b = btf;
286 b1 = btf1; 310 b1 = btf1;
287 } 311 }
288 312
289 // nucleus contribution logarithm 313 // nucleus contribution logarithm
290 G4double rab1 = b*z13; << 314 G4double rab1=b*z13;
291 G4double fn = G4Log(rab1/(dnstar*(CLHEP::ele << 315 G4double fn=G4Log(rab1/(dnstar*(electron_mass_c2+rab0*rab1))*
292 (mass + delta*(dnstar*sqrte-2.))); << 316 (mass+delta*(dnstar*sqrte-2.))) ;
293 fn = std::max(fn, 0.); << 317 if(fn <0.) { fn = 0.; }
294 // electron contribution logarithm 318 // electron contribution logarithm
295 G4double epmax1 = E/(1.+0.5*mass*rmass/E); << 319 G4double epmax1=E/(1.+0.5*mass*rmass/E) ;
296 G4double fe = 0.; << 320 G4double fe=0.;
297 if(gammaEnergy < epmax1) { << 321 if(gammaEnergy<epmax1)
298 G4double rab2 = b1*z13*z13; << 322 {
299 fe = G4Log(rab2*mass/((1.+delta*rmass/(CLH << 323 G4double rab2=b1*z13*z13 ;
300 (CLHEP::electron_mass_c2+rab0*rab2))); << 324 fe=G4Log(rab2*mass/((1.+delta*rmass/(electron_mass_c2*sqrte))*
301 fe = std::max(fe, 0.); << 325 (electron_mass_c2+rab0*rab2))) ;
>> 326 if(fe<0.) { fe=0.; }
302 } 327 }
303 328
304 dxsection = coeff*(1.-v*(1. - 0.75*v))*Z*(fn 329 dxsection = coeff*(1.-v*(1. - 0.75*v))*Z*(fn*Z + fe)/gammaEnergy;
305 dxsection = std::max(dxsection, 0.0); << 330
306 return dxsection; 331 return dxsection;
307 } 332 }
308 333
309 //....oooOO0OOooo........oooOO0OOooo........oo 334 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
310 335
311 G4double G4MuBremsstrahlungModel::ComputeCross 336 G4double G4MuBremsstrahlungModel::ComputeCrossSectionPerAtom(
312 con 337 const G4ParticleDefinition*,
313 338 G4double kineticEnergy,
314 339 G4double Z, G4double,
315 340 G4double cutEnergy,
316 341 G4double maxEnergy)
317 { 342 {
318 G4double cross = 0.0; 343 G4double cross = 0.0;
319 if (kineticEnergy <= lowestKinEnergy) return 344 if (kineticEnergy <= lowestKinEnergy) return cross;
320 G4double tmax = std::min(maxEnergy, kineticE 345 G4double tmax = std::min(maxEnergy, kineticEnergy);
321 G4double cut = std::min(cutEnergy, kineticE 346 G4double cut = std::min(cutEnergy, kineticEnergy);
322 if (cut < minThreshold) cut = minThreshold; << 347 if(cut < minThreshold) cut = minThreshold;
323 if (cut >= tmax) return cross; 348 if (cut >= tmax) return cross;
324 349
325 cross = ComputeMicroscopicCrossSection (kine 350 cross = ComputeMicroscopicCrossSection (kineticEnergy, Z, cut);
326 if(tmax < kineticEnergy) { 351 if(tmax < kineticEnergy) {
327 cross -= ComputeMicroscopicCrossSection(ki 352 cross -= ComputeMicroscopicCrossSection(kineticEnergy, Z, tmax);
328 } 353 }
329 return cross; 354 return cross;
330 } 355 }
331 356
332 //....oooOO0OOooo........oooOO0OOooo........oo 357 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
333 358
334 void G4MuBremsstrahlungModel::SampleSecondarie 359 void G4MuBremsstrahlungModel::SampleSecondaries(
335 std::vector<G4Dy 360 std::vector<G4DynamicParticle*>* vdp,
336 const G4Material 361 const G4MaterialCutsCouple* couple,
337 const G4DynamicP 362 const G4DynamicParticle* dp,
338 G4double minEner 363 G4double minEnergy,
339 G4double maxEner 364 G4double maxEnergy)
340 { 365 {
341 G4double kineticEnergy = dp->GetKineticEnerg 366 G4double kineticEnergy = dp->GetKineticEnergy();
342 // check against insufficient energy 367 // check against insufficient energy
343 G4double tmax = std::min(kineticEnergy, maxE 368 G4double tmax = std::min(kineticEnergy, maxEnergy);
344 G4double tmin = std::min(kineticEnergy, minE 369 G4double tmin = std::min(kineticEnergy, minEnergy);
345 tmin = std::max(tmin, minThreshold); << 370 if(tmin < minThreshold) tmin = minThreshold;
346 if(tmin >= tmax) return; 371 if(tmin >= tmax) return;
347 372
348 // ===== sampling of energy transfer ====== 373 // ===== sampling of energy transfer ======
349 374
350 G4ParticleMomentum partDirection = dp->GetMo 375 G4ParticleMomentum partDirection = dp->GetMomentumDirection();
351 376
352 // select randomly one element constituing t 377 // select randomly one element constituing the material
353 const G4Element* anElement = SelectRandomAto 378 const G4Element* anElement = SelectRandomAtom(couple,particle,kineticEnergy);
354 G4double Z = anElement->GetZ(); 379 G4double Z = anElement->GetZ();
>> 380
355 G4double func1 = tmin* 381 G4double func1 = tmin*
356 ComputeDMicroscopicCrossSection(kineticEne << 382 ComputeDMicroscopicCrossSection(kineticEnergy,Z,tmin);
357 383
358 G4double gEnergy; << 384 G4double lnepksi, epksi;
359 G4double func2; 385 G4double func2;
360 386
361 G4double xmin = G4Log(tmin/minThreshold); << 387 G4double xmin = G4Log(tmin/CLHEP::MeV);
362 G4double xmax = G4Log(tmax/tmin); << 388 G4double xmax = G4Log(kineticEnergy/tmin);
363 389
364 do { 390 do {
365 gEnergy = minThreshold*G4Exp(xmin + G4Unif << 391 lnepksi = xmin + G4UniformRand()*xmax;
366 func2 = gEnergy*ComputeDMicroscopicCrossSe << 392 epksi = CLHEP::MeV*G4Exp(lnepksi);
367 << 393 func2 = epksi*ComputeDMicroscopicCrossSection(kineticEnergy,Z,epksi);
>> 394
368 // Loop checking, 03-Aug-2015, Vladimir Iv 395 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
369 } while(func2 < func1*G4UniformRand()); 396 } while(func2 < func1*G4UniformRand());
370 397
>> 398 G4double gEnergy = epksi;
>> 399
>> 400 // ===== sample angle =====
>> 401
>> 402 //
371 // angles of the emitted gamma using general 403 // angles of the emitted gamma using general interface
>> 404
372 G4ThreeVector gamDir = 405 G4ThreeVector gamDir =
373 GetAngularDistribution()->SampleDirection( 406 GetAngularDistribution()->SampleDirection(dp, gEnergy, Z,
374 407 couple->GetMaterial());
375 // create G4DynamicParticle object for the G 408 // create G4DynamicParticle object for the Gamma
376 G4DynamicParticle* gamma = new G4DynamicPart 409 G4DynamicParticle* gamma = new G4DynamicParticle(theGamma, gamDir, gEnergy);
377 vdp->push_back(gamma); 410 vdp->push_back(gamma);
378 <<
379 // compute post-interaction kinematics of pr 411 // compute post-interaction kinematics of primary e-/e+ based on
380 // energy-momentum conservation 412 // energy-momentum conservation
381 const G4double totMomentum = 413 const G4double totMomentum =
382 std::sqrt(kineticEnergy*(kineticEnergy + 2 414 std::sqrt(kineticEnergy*(kineticEnergy + 2.0*mass));
383 G4ThreeVector dir = 415 G4ThreeVector dir =
384 (totMomentum*dp->GetMomentumDirection() - << 416 (totMomentum*dp->GetMomentumDirection()-gEnergy*gamDir).unit();
385 const G4double finalE = kineticEnergy - gEne 417 const G4double finalE = kineticEnergy - gEnergy;
386 <<
387 // if secondary gamma energy is higher than 418 // if secondary gamma energy is higher than threshold(very high by default)
388 // then stop tracking the primary particle a 419 // then stop tracking the primary particle and create new secondary e-/e+
389 // instead of the primary one 420 // instead of the primary one
390 if (gEnergy > SecondaryThreshold()) { 421 if (gEnergy > SecondaryThreshold()) {
391 fParticleChange->ProposeTrackStatus(fStopA 422 fParticleChange->ProposeTrackStatus(fStopAndKill);
392 fParticleChange->SetProposedKineticEnergy( 423 fParticleChange->SetProposedKineticEnergy(0.0);
393 G4DynamicParticle* newdp = new G4DynamicPa 424 G4DynamicParticle* newdp = new G4DynamicParticle(particle, dir, finalE);
394 vdp->push_back(newdp); 425 vdp->push_back(newdp);
395 } else { << 426 } else { // continue tracking the primary e-/e+ otherwise
396 // continue tracking the primary e-/e+ oth <<
397 fParticleChange->SetProposedMomentumDirect 427 fParticleChange->SetProposedMomentumDirection(dir);
398 fParticleChange->SetProposedKineticEnergy( 428 fParticleChange->SetProposedKineticEnergy(finalE);
399 } 429 }
400 } 430 }
401 431
402 //....oooOO0OOooo........oooOO0OOooo........oo 432 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
403 433