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25 // 25 //
>> 26 // $Id$
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class file 30 // GEANT4 Class file
30 // 31 //
31 // 32 //
32 // File name: G4MollerBhabhaModel 33 // File name: G4MollerBhabhaModel
33 // 34 //
34 // Author: Vladimir Ivanchenko on base 35 // Author: Vladimir Ivanchenko on base of Laszlo Urban code
35 // 36 //
36 // Creation date: 03.01.2002 37 // Creation date: 03.01.2002
37 // 38 //
38 // Modifications: 39 // Modifications:
39 // 40 //
40 // 13-11-02 Minor fix - use normalised directi 41 // 13-11-02 Minor fix - use normalised direction (V.Ivanchenko)
41 // 04-12-02 Change G4DynamicParticle construct 42 // 04-12-02 Change G4DynamicParticle constructor in PostStepDoIt (V.Ivanchenko)
42 // 23-12-02 Change interface in order to move 43 // 23-12-02 Change interface in order to move to cut per region (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 name (V.Ivanchenko) 45 // 13-02-03 Add name (V.Ivanchenko)
45 // 08-04-05 Major optimisation of internal int 46 // 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
46 // 25-07-05 Add protection in calculation of r 47 // 25-07-05 Add protection in calculation of recoil direction for the case
47 // of complete energy transfer from e 48 // of complete energy transfer from e+ to e- (V.Ivanchenko)
48 // 06-02-06 ComputeCrossSectionPerElectron, Co 49 // 06-02-06 ComputeCrossSectionPerElectron, ComputeCrossSectionPerAtom (mma)
49 // 15-05-06 Fix MinEnergyCut (V.Ivanchenko) 50 // 15-05-06 Fix MinEnergyCut (V.Ivanchenko)
50 // 51 //
51 // 52 //
52 // Class Description: 53 // Class Description:
53 // 54 //
54 // Implementation of energy loss and delta-ele 55 // Implementation of energy loss and delta-electron production by e+/e-
55 // 56 //
56 // ------------------------------------------- 57 // -------------------------------------------------------------------
57 // 58 //
58 //....oooOO0OOooo........oooOO0OOooo........oo 59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
59 //....oooOO0OOooo........oooOO0OOooo........oo 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
60 61
61 #include "G4MollerBhabhaModel.hh" 62 #include "G4MollerBhabhaModel.hh"
62 #include "G4PhysicalConstants.hh" 63 #include "G4PhysicalConstants.hh"
63 #include "G4SystemOfUnits.hh" 64 #include "G4SystemOfUnits.hh"
64 #include "G4Electron.hh" 65 #include "G4Electron.hh"
65 #include "G4Positron.hh" 66 #include "G4Positron.hh"
66 #include "Randomize.hh" 67 #include "Randomize.hh"
67 #include "G4ParticleChangeForLoss.hh" 68 #include "G4ParticleChangeForLoss.hh"
68 #include "G4Log.hh" <<
69 #include "G4DeltaAngle.hh" <<
70 69
71 //....oooOO0OOooo........oooOO0OOooo........oo 70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
72 71
73 using namespace std; 72 using namespace std;
74 73
75 G4MollerBhabhaModel::G4MollerBhabhaModel(const 74 G4MollerBhabhaModel::G4MollerBhabhaModel(const G4ParticleDefinition* p,
76 const 75 const G4String& nam)
77 : G4VEmModel(nam), 76 : G4VEmModel(nam),
78 particle(nullptr), << 77 particle(0),
79 isElectron(true), 78 isElectron(true),
80 twoln10(2.0*G4Log(10.0)), << 79 twoln10(2.0*log(10.0)),
81 lowLimit(0.02*keV), 80 lowLimit(0.02*keV),
82 isInitialised(false) 81 isInitialised(false)
83 { 82 {
84 theElectron = G4Electron::Electron(); 83 theElectron = G4Electron::Electron();
85 if(nullptr != p) { SetParticle(p); } << 84 if(p) { SetParticle(p); }
86 fParticleChange = nullptr; << 85 fParticleChange = 0;
87 } 86 }
88 87
89 //....oooOO0OOooo........oooOO0OOooo........oo 88 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
90 89
91 G4MollerBhabhaModel::~G4MollerBhabhaModel() = << 90 G4MollerBhabhaModel::~G4MollerBhabhaModel()
>> 91 {}
92 92
93 //....oooOO0OOooo........oooOO0OOooo........oo 93 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
94 94
95 G4double G4MollerBhabhaModel::MaxSecondaryEner 95 G4double G4MollerBhabhaModel::MaxSecondaryEnergy(const G4ParticleDefinition*,
96 << 96 G4double kinEnergy)
97 { 97 {
98 G4double tmax = kinEnergy; 98 G4double tmax = kinEnergy;
99 if(isElectron) { tmax *= 0.5; } 99 if(isElectron) { tmax *= 0.5; }
100 return tmax; 100 return tmax;
101 } 101 }
102 102
103 //....oooOO0OOooo........oooOO0OOooo........oo 103 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
104 104
105 void G4MollerBhabhaModel::Initialise(const G4P 105 void G4MollerBhabhaModel::Initialise(const G4ParticleDefinition* p,
106 const G4D 106 const G4DataVector&)
107 { 107 {
108 if(p != particle) { SetParticle(p); } << 108 if(!particle) { SetParticle(p); }
109 109
110 if(isInitialised) { return; } 110 if(isInitialised) { return; }
111 111
112 isInitialised = true; 112 isInitialised = true;
113 fParticleChange = GetParticleChangeForLoss() 113 fParticleChange = GetParticleChangeForLoss();
114 if(UseAngularGeneratorFlag() && !GetAngularD <<
115 SetAngularDistribution(new G4DeltaAngle()) <<
116 } <<
117 } 114 }
118 115
119 //....oooOO0OOooo........oooOO0OOooo........oo 116 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
120 117
121 G4double G4MollerBhabhaModel::ComputeCrossSect << 118 G4double
122 const G4ParticleDefinition* p, G4doub << 119 G4MollerBhabhaModel::ComputeCrossSectionPerElectron(const G4ParticleDefinition* p,
123 G4double cutEnergy, G4double maxEnergy) << 120 G4double kineticEnergy,
>> 121 G4double cutEnergy,
>> 122 G4double maxEnergy)
124 { 123 {
125 if(p != particle) { SetParticle(p); } << 124 if(!particle) { SetParticle(p); }
126 125
127 G4double cross = 0.0; 126 G4double cross = 0.0;
128 G4double tmax = MaxSecondaryEnergy(p, kineti 127 G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
129 tmax = std::min(maxEnergy, tmax); 128 tmax = std::min(maxEnergy, tmax);
130 //G4cout << "E= " << kineticEnergy << " cut= << 129
131 // << " Emax= " << tmax << G4endl; <<
132 if(cutEnergy < tmax) { 130 if(cutEnergy < tmax) {
133 131
134 G4double xmin = cutEnergy/kineticEnergy; 132 G4double xmin = cutEnergy/kineticEnergy;
135 G4double xmax = tmax/kineticEnergy; 133 G4double xmax = tmax/kineticEnergy;
136 G4double tau = kineticEnergy/electron_ma 134 G4double tau = kineticEnergy/electron_mass_c2;
137 G4double gam = tau + 1.0; 135 G4double gam = tau + 1.0;
138 G4double gamma2= gam*gam; 136 G4double gamma2= gam*gam;
139 G4double beta2 = tau*(tau + 2)/gamma2; 137 G4double beta2 = tau*(tau + 2)/gamma2;
140 138
141 //Moller (e-e-) scattering 139 //Moller (e-e-) scattering
142 if (isElectron) { 140 if (isElectron) {
143 141
144 G4double gg = (2.0*gam - 1.0)/gamma2; 142 G4double gg = (2.0*gam - 1.0)/gamma2;
145 cross = ((xmax - xmin)*(1.0 - gg + 1.0/( 143 cross = ((xmax - xmin)*(1.0 - gg + 1.0/(xmin*xmax)
146 + 1.0/((1.0-xmin << 144 + 1.0/((1.0-xmin)*(1.0 - xmax)))
147 - gg*G4Log( xmax*(1.0 - xmin)/(xmi << 145 - gg*log( xmax*(1.0 - xmin)/(xmin*(1.0 - xmax)) ) ) / beta2;
148 146
149 //Bhabha (e+e-) scattering 147 //Bhabha (e+e-) scattering
150 } else { 148 } else {
151 149
152 G4double y = 1.0/(1.0 + gam); 150 G4double y = 1.0/(1.0 + gam);
153 G4double y2 = y*y; 151 G4double y2 = y*y;
154 G4double y12 = 1.0 - 2.0*y; 152 G4double y12 = 1.0 - 2.0*y;
155 G4double b1 = 2.0 - y2; 153 G4double b1 = 2.0 - y2;
156 G4double b2 = y12*(3.0 + y2); 154 G4double b2 = y12*(3.0 + y2);
157 G4double y122= y12*y12; 155 G4double y122= y12*y12;
158 G4double b4 = y122*y12; 156 G4double b4 = y122*y12;
159 G4double b3 = b4 + y122; 157 G4double b3 = b4 + y122;
160 158
161 cross = (xmax - xmin)*(1.0/(beta2*xmin*x 159 cross = (xmax - xmin)*(1.0/(beta2*xmin*xmax) + b2
162 - 0.5*b3*(xmin + xmax) 160 - 0.5*b3*(xmin + xmax)
163 + b4*(xmin*xmin + xmin*xmax + xmax << 161 + b4*(xmin*xmin + xmin*xmax + xmax*xmax)/3.0)
164 - b1*G4Log(xmax/xmin); << 162 - b1*log(xmax/xmin);
165 } 163 }
166 164
167 cross *= twopi_mc2_rcl2/kineticEnergy; 165 cross *= twopi_mc2_rcl2/kineticEnergy;
168 } 166 }
169 return cross; 167 return cross;
170 } 168 }
171 169
172 //....oooOO0OOooo........oooOO0OOooo........oo 170 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
173 171
174 G4double G4MollerBhabhaModel::ComputeCrossSect 172 G4double G4MollerBhabhaModel::ComputeCrossSectionPerAtom(
175 con 173 const G4ParticleDefinition* p,
176 174 G4double kineticEnergy,
177 << 175 G4double Z, G4double,
178 176 G4double cutEnergy,
179 177 G4double maxEnergy)
180 { 178 {
181 return Z*ComputeCrossSectionPerElectron(p,ki 179 return Z*ComputeCrossSectionPerElectron(p,kineticEnergy,cutEnergy,maxEnergy);
182 } 180 }
183 181
184 //....oooOO0OOooo........oooOO0OOooo........oo 182 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
185 183
186 G4double G4MollerBhabhaModel::CrossSectionPerV 184 G4double G4MollerBhabhaModel::CrossSectionPerVolume(
187 con << 185 const G4Material* material,
188 con 186 const G4ParticleDefinition* p,
189 187 G4double kinEnergy,
190 188 G4double cutEnergy,
191 189 G4double maxEnergy)
192 { 190 {
193 G4double eDensity = material->GetElectronDen 191 G4double eDensity = material->GetElectronDensity();
194 return eDensity*ComputeCrossSectionPerElectr 192 return eDensity*ComputeCrossSectionPerElectron(p,kinEnergy,cutEnergy,maxEnergy);
>> 193 /*
>> 194 G4double Zeff = eDensity/material->GetTotNbOfAtomsPerVolume();
>> 195 G4double th = 0.25*sqrt(Zeff)*keV;
>> 196 G4double cut;
>> 197 if(isElectron) { cut = std::max(th*0.5, cutEnergy); }
>> 198 else { cut = std::max(th, cutEnergy); }
>> 199 G4double res = 0.0;
>> 200 // below this threshold no bremsstrahlung
>> 201 if (kinEnergy > th) {
>> 202 res = eDensity*ComputeCrossSectionPerElectron(p,kinEnergy,cut,maxEnergy);
>> 203 }
>> 204 return res;
>> 205 */
195 } 206 }
196 207
197 //....oooOO0OOooo........oooOO0OOooo........oo 208 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
198 209
199 G4double G4MollerBhabhaModel::ComputeDEDXPerVo 210 G4double G4MollerBhabhaModel::ComputeDEDXPerVolume(
200 cons << 211 const G4Material* material,
201 cons 212 const G4ParticleDefinition* p,
202 213 G4double kineticEnergy,
203 214 G4double cut)
204 { 215 {
205 if(p != particle) { SetParticle(p); } << 216 if(!particle) { SetParticle(p); }
206 // calculate the dE/dx due to the ionization 217 // calculate the dE/dx due to the ionization by Seltzer-Berger formula
207 // checl low-energy limit 218 // checl low-energy limit
208 G4double electronDensity = material->GetElec 219 G4double electronDensity = material->GetElectronDensity();
209 220
210 G4double Zeff = material->GetIonisation()-> << 221 G4double Zeff = electronDensity/material->GetTotNbOfAtomsPerVolume();
211 G4double th = 0.25*sqrt(Zeff)*keV; 222 G4double th = 0.25*sqrt(Zeff)*keV;
212 G4double tkin = std::max(kineticEnergy, th); << 223 // G4double cut;
>> 224 // if(isElectron) { cut = std::max(th*0.5, cutEnergy); }
>> 225 // else { cut = std::max(th, cutEnergy); }
>> 226 G4double tkin = kineticEnergy;
>> 227 if (kineticEnergy < th) { tkin = th; }
213 228
214 G4double tau = tkin/electron_mass_c2; 229 G4double tau = tkin/electron_mass_c2;
215 G4double gam = tau + 1.0; 230 G4double gam = tau + 1.0;
216 G4double gamma2= gam*gam; 231 G4double gamma2= gam*gam;
217 G4double bg2 = tau*(tau + 2); 232 G4double bg2 = tau*(tau + 2);
218 G4double beta2 = bg2/gamma2; 233 G4double beta2 = bg2/gamma2;
219 234
220 G4double eexc = material->GetIonisation()-> 235 G4double eexc = material->GetIonisation()->GetMeanExcitationEnergy();
221 eexc /= electron_mass_c2; 236 eexc /= electron_mass_c2;
222 G4double eexc2 = eexc*eexc; 237 G4double eexc2 = eexc*eexc;
223 238
224 G4double d = std::min(cut, MaxSecondaryEnerg 239 G4double d = std::min(cut, MaxSecondaryEnergy(p, tkin))/electron_mass_c2;
225 G4double dedx; 240 G4double dedx;
226 241
227 // electron 242 // electron
228 if (isElectron) { 243 if (isElectron) {
229 244
230 dedx = G4Log(2.0*(tau + 2.0)/eexc2) - 1.0 << 245 dedx = log(2.0*(tau + 2.0)/eexc2) - 1.0 - beta2
231 + G4Log((tau-d)*d) + tau/(tau-d) << 246 + log((tau-d)*d) + tau/(tau-d)
232 + (0.5*d*d + (2.0*tau + 1.)*G4Log(1. << 247 + (0.5*d*d + (2.0*tau + 1.)*log(1. - d/tau))/gamma2;
233 248
234 //positron 249 //positron
235 } else { 250 } else {
236 251
237 G4double d2 = d*d*0.5; 252 G4double d2 = d*d*0.5;
238 G4double d3 = d2*d/1.5; 253 G4double d3 = d2*d/1.5;
239 G4double d4 = d3*d*0.75; 254 G4double d4 = d3*d*0.75;
240 G4double y = 1.0/(1.0 + gam); 255 G4double y = 1.0/(1.0 + gam);
241 dedx = G4Log(2.0*(tau + 2.0)/eexc2) + G4Lo << 256 dedx = log(2.0*(tau + 2.0)/eexc2) + log(tau*d)
242 - beta2*(tau + 2.0*d - y*(3.0*d2 257 - beta2*(tau + 2.0*d - y*(3.0*d2
243 + y*(d - d3 + y*(d2 - tau*d3 + d4)))) 258 + y*(d - d3 + y*(d2 - tau*d3 + d4))))/tau;
244 } 259 }
245 260
246 //density correction 261 //density correction
247 G4double x = G4Log(bg2)/twoln10; << 262 G4double x = log(bg2)/twoln10;
248 dedx -= material->GetIonisation()->DensityCo 263 dedx -= material->GetIonisation()->DensityCorrection(x);
249 264
250 // now you can compute the total ionization 265 // now you can compute the total ionization loss
251 dedx *= twopi_mc2_rcl2*electronDensity/beta2 266 dedx *= twopi_mc2_rcl2*electronDensity/beta2;
252 if (dedx < 0.0) { dedx = 0.0; } 267 if (dedx < 0.0) { dedx = 0.0; }
253 268
254 // lowenergy extrapolation 269 // lowenergy extrapolation
255 270
256 if (kineticEnergy < th) { 271 if (kineticEnergy < th) {
257 x = kineticEnergy/th; 272 x = kineticEnergy/th;
258 if(x > 0.25) { dedx /= sqrt(x); } 273 if(x > 0.25) { dedx /= sqrt(x); }
259 else { dedx *= 1.4*sqrt(x)/(0.1 + x); } 274 else { dedx *= 1.4*sqrt(x)/(0.1 + x); }
260 } 275 }
261 return dedx; 276 return dedx;
262 } 277 }
263 278
264 //....oooOO0OOooo........oooOO0OOooo........oo 279 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
265 280
266 void << 281 void G4MollerBhabhaModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
267 G4MollerBhabhaModel::SampleSecondaries(std::ve << 282 const G4MaterialCutsCouple*,
268 const G << 283 const G4DynamicParticle* dp,
269 const G << 284 G4double cutEnergy,
270 G4doubl << 285 G4double maxEnergy)
271 G4doubl <<
272 { 286 {
273 G4double kineticEnergy = dp->GetKineticEnerg 287 G4double kineticEnergy = dp->GetKineticEnergy();
274 //G4cout << "G4MollerBhabhaModel::SampleSeco << 288 //const G4Material* mat = couple->GetMaterial();
275 // << " in " << couple->GetMaterial()- << 289 //G4double Zeff = mat->GetElectronDensity()/mat->GetTotNbOfAtomsPerVolume();
>> 290 // G4double th = 0.25*sqrt(Zeff)*keV;
276 G4double tmax; 291 G4double tmax;
277 G4double tmin = cutEnergy; 292 G4double tmin = cutEnergy;
278 if(isElectron) { 293 if(isElectron) {
279 tmax = 0.5*kineticEnergy; 294 tmax = 0.5*kineticEnergy;
280 } else { 295 } else {
281 tmax = kineticEnergy; 296 tmax = kineticEnergy;
282 } 297 }
283 if(maxEnergy < tmax) { tmax = maxEnergy; } 298 if(maxEnergy < tmax) { tmax = maxEnergy; }
284 if(tmin >= tmax) { return; } 299 if(tmin >= tmax) { return; }
285 300
286 G4double energy = kineticEnergy + electron_m 301 G4double energy = kineticEnergy + electron_mass_c2;
>> 302 G4double totalMomentum = sqrt(kineticEnergy*(energy + electron_mass_c2));
287 G4double xmin = tmin/kineticEnergy; 303 G4double xmin = tmin/kineticEnergy;
288 G4double xmax = tmax/kineticEnergy; 304 G4double xmax = tmax/kineticEnergy;
289 G4double gam = energy/electron_mass_c2; 305 G4double gam = energy/electron_mass_c2;
290 G4double gamma2 = gam*gam; 306 G4double gamma2 = gam*gam;
291 G4double beta2 = 1.0 - 1.0/gamma2; 307 G4double beta2 = 1.0 - 1.0/gamma2;
292 G4double x, z, grej; << 308 G4double x, z, q, grej;
293 CLHEP::HepRandomEngine* rndmEngine = G4Rando << 309
294 G4double rndm[2]; << 310 G4ThreeVector direction = dp->GetMomentumDirection();
295 311
296 //Moller (e-e-) scattering 312 //Moller (e-e-) scattering
297 if (isElectron) { 313 if (isElectron) {
298 314
299 G4double gg = (2.0*gam - 1.0)/gamma2; 315 G4double gg = (2.0*gam - 1.0)/gamma2;
300 G4double y = 1.0 - xmax; 316 G4double y = 1.0 - xmax;
301 grej = 1.0 - gg*xmax + xmax*xmax*(1.0 - gg 317 grej = 1.0 - gg*xmax + xmax*xmax*(1.0 - gg + (1.0 - gg*y)/(y*y));
302 318
303 do { 319 do {
304 rndmEngine->flatArray(2, rndm); << 320 q = G4UniformRand();
305 x = xmin*xmax/(xmin*(1.0 - rndm[0]) + xm << 321 x = xmin*xmax/(xmin*(1.0 - q) + xmax*q);
306 y = 1.0 - x; 322 y = 1.0 - x;
307 z = 1.0 - gg*x + x*x*(1.0 - gg + (1.0 - 323 z = 1.0 - gg*x + x*x*(1.0 - gg + (1.0 - gg*y)/(y*y));
308 /* 324 /*
309 if(z > grej) { 325 if(z > grej) {
310 G4cout << "G4MollerBhabhaModel::Sample 326 G4cout << "G4MollerBhabhaModel::SampleSecondary Warning! "
311 << "Majorant " << grej << " < " 327 << "Majorant " << grej << " < "
312 << z << " for x= " << x 328 << z << " for x= " << x
313 << " e-e- scattering" 329 << " e-e- scattering"
314 << G4endl; 330 << G4endl;
315 } 331 }
316 */ 332 */
317 // Loop checking, 03-Aug-2015, Vladimir << 333 } while(grej * G4UniformRand() > z);
318 } while(grej * rndm[1] > z); <<
319 334
320 //Bhabha (e+e-) scattering 335 //Bhabha (e+e-) scattering
321 } else { 336 } else {
322 337
323 G4double y = 1.0/(1.0 + gam); 338 G4double y = 1.0/(1.0 + gam);
324 G4double y2 = y*y; 339 G4double y2 = y*y;
325 G4double y12 = 1.0 - 2.0*y; 340 G4double y12 = 1.0 - 2.0*y;
326 G4double b1 = 2.0 - y2; 341 G4double b1 = 2.0 - y2;
327 G4double b2 = y12*(3.0 + y2); 342 G4double b2 = y12*(3.0 + y2);
328 G4double y122= y12*y12; 343 G4double y122= y12*y12;
329 G4double b4 = y122*y12; 344 G4double b4 = y122*y12;
330 G4double b3 = b4 + y122; 345 G4double b3 = b4 + y122;
331 346
332 y = xmax*xmax; 347 y = xmax*xmax;
333 grej = 1.0 + (y*y*b4 - xmin*xmin*xmin*b3 + 348 grej = 1.0 + (y*y*b4 - xmin*xmin*xmin*b3 + y*b2 - xmin*b1)*beta2;
334 do { 349 do {
335 rndmEngine->flatArray(2, rndm); << 350 q = G4UniformRand();
336 x = xmin*xmax/(xmin*(1.0 - rndm[0]) + xm << 351 x = xmin*xmax/(xmin*(1.0 - q) + xmax*q);
337 y = x*x; 352 y = x*x;
338 z = 1.0 + (y*y*b4 - x*y*b3 + y*b2 - x*b1 353 z = 1.0 + (y*y*b4 - x*y*b3 + y*b2 - x*b1)*beta2;
339 /* 354 /*
340 if(z > grej) { 355 if(z > grej) {
341 G4cout << "G4MollerBhabhaModel::Sample 356 G4cout << "G4MollerBhabhaModel::SampleSecondary Warning! "
342 << "Majorant " << grej << " < " 357 << "Majorant " << grej << " < "
343 << z << " for x= " << x 358 << z << " for x= " << x
344 << " e+e- scattering" 359 << " e+e- scattering"
345 << G4endl; 360 << G4endl;
346 } 361 }
347 */ 362 */
348 // Loop checking, 03-Aug-2015, Vladimir << 363 } while(grej * G4UniformRand() > z);
349 } while(grej * rndm[1] > z); <<
350 } 364 }
351 365
352 G4double deltaKinEnergy = x * kineticEnergy; 366 G4double deltaKinEnergy = x * kineticEnergy;
353 367
354 G4ThreeVector deltaDirection; << 368 G4double deltaMomentum =
>> 369 sqrt(deltaKinEnergy * (deltaKinEnergy + 2.0*electron_mass_c2));
>> 370 G4double cost = deltaKinEnergy * (energy + electron_mass_c2) /
>> 371 (deltaMomentum * totalMomentum);
>> 372 G4double sint = (1.0 - cost)*(1. + cost);
>> 373 if(sint > 0.0) { sint = sqrt(sint); }
>> 374 else { sint = 0.0; }
355 375
356 if(UseAngularGeneratorFlag()) { << 376 G4double phi = twopi * G4UniformRand() ;
357 const G4Material* mat = couple->GetMateri <<
358 G4int Z = SelectRandomAtomNumber(mat); <<
359 377
360 deltaDirection = << 378 G4ThreeVector deltaDirection(sint*cos(phi),sint*sin(phi), cost) ;
361 GetAngularDistribution()->SampleDirectio << 379 deltaDirection.rotateUz(direction);
362 <<
363 } else { <<
364 <<
365 G4double deltaMomentum = <<
366 sqrt(deltaKinEnergy * (deltaKinEnergy + <<
367 G4double cost = deltaKinEnergy * (energy + <<
368 (deltaMomentum * dp->GetTotalMomentum()) <<
369 if(cost > 1.0) { cost = 1.0; } <<
370 G4double sint = sqrt((1.0 - cost)*(1.0 + c <<
371 <<
372 G4double phi = twopi * rndmEngine->flat() <<
373 <<
374 deltaDirection.set(sint*cos(phi),sint*sin( <<
375 deltaDirection.rotateUz(dp->GetMomentumDir <<
376 } <<
377 <<
378 // create G4DynamicParticle object for delta <<
379 auto delta = new G4DynamicParticle(theElectr <<
380 vdp->push_back(delta); <<
381 380
382 // primary change 381 // primary change
383 kineticEnergy -= deltaKinEnergy; 382 kineticEnergy -= deltaKinEnergy;
384 G4ThreeVector finalP = dp->GetMomentum() - d <<
385 finalP = finalP.unit(); <<
386 <<
387 fParticleChange->SetProposedKineticEnergy(ki 383 fParticleChange->SetProposedKineticEnergy(kineticEnergy);
388 fParticleChange->SetProposedMomentumDirectio << 384
>> 385 G4ThreeVector dir = totalMomentum*direction - deltaMomentum*deltaDirection;
>> 386 direction = dir.unit();
>> 387 fParticleChange->SetProposedMomentumDirection(direction);
>> 388
>> 389 // create G4DynamicParticle object for delta ray
>> 390 G4DynamicParticle* delta = new G4DynamicParticle(theElectron,
>> 391 deltaDirection,deltaKinEnergy);
>> 392 vdp->push_back(delta);
389 } 393 }
390 394
391 //....oooOO0OOooo........oooOO0OOooo........oo 395 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
392 396