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25 // 25 //
>> 26 // $Id: G4MollerBhabhaModel.cc,v 1.30 2007/05/22 17:34:36 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-00 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class file 31 // GEANT4 Class file
30 // 32 //
31 // 33 //
32 // File name: G4MollerBhabhaModel 34 // File name: G4MollerBhabhaModel
33 // 35 //
34 // Author: Vladimir Ivanchenko on base 36 // Author: Vladimir Ivanchenko on base of Laszlo Urban code
35 // 37 //
36 // Creation date: 03.01.2002 38 // Creation date: 03.01.2002
37 // 39 //
38 // Modifications: 40 // Modifications:
39 // 41 //
40 // 13-11-02 Minor fix - use normalised directi 42 // 13-11-02 Minor fix - use normalised direction (V.Ivanchenko)
41 // 04-12-02 Change G4DynamicParticle construct 43 // 04-12-02 Change G4DynamicParticle constructor in PostStepDoIt (V.Ivanchenko)
42 // 23-12-02 Change interface in order to move 44 // 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 45 // 27-01-03 Make models region aware (V.Ivanchenko)
44 // 13-02-03 Add name (V.Ivanchenko) 46 // 13-02-03 Add name (V.Ivanchenko)
45 // 08-04-05 Major optimisation of internal int 47 // 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
46 // 25-07-05 Add protection in calculation of r 48 // 25-07-05 Add protection in calculation of recoil direction for the case
47 // of complete energy transfer from e 49 // of complete energy transfer from e+ to e- (V.Ivanchenko)
48 // 06-02-06 ComputeCrossSectionPerElectron, Co 50 // 06-02-06 ComputeCrossSectionPerElectron, ComputeCrossSectionPerAtom (mma)
49 // 15-05-06 Fix MinEnergyCut (V.Ivanchenko) 51 // 15-05-06 Fix MinEnergyCut (V.Ivanchenko)
50 // 52 //
51 // 53 //
52 // Class Description: 54 // Class Description:
53 // 55 //
54 // Implementation of energy loss and delta-ele 56 // Implementation of energy loss and delta-electron production by e+/e-
55 // 57 //
56 // ------------------------------------------- 58 // -------------------------------------------------------------------
57 // 59 //
58 //....oooOO0OOooo........oooOO0OOooo........oo 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
59 //....oooOO0OOooo........oooOO0OOooo........oo 61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
60 62
61 #include "G4MollerBhabhaModel.hh" 63 #include "G4MollerBhabhaModel.hh"
62 #include "G4PhysicalConstants.hh" <<
63 #include "G4SystemOfUnits.hh" <<
64 #include "G4Electron.hh" 64 #include "G4Electron.hh"
65 #include "G4Positron.hh" 65 #include "G4Positron.hh"
66 #include "Randomize.hh" 66 #include "Randomize.hh"
67 #include "G4ParticleChangeForLoss.hh" 67 #include "G4ParticleChangeForLoss.hh"
68 #include "G4Log.hh" <<
69 #include "G4DeltaAngle.hh" <<
70 68
71 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
72 70
73 using namespace std; 71 using namespace std;
74 72
75 G4MollerBhabhaModel::G4MollerBhabhaModel(const 73 G4MollerBhabhaModel::G4MollerBhabhaModel(const G4ParticleDefinition* p,
76 const 74 const G4String& nam)
77 : G4VEmModel(nam), 75 : G4VEmModel(nam),
78 particle(nullptr), << 76 particle(0),
79 isElectron(true), << 77 isElectron(true),
80 twoln10(2.0*G4Log(10.0)), << 78 twoln10(2.0*log(10.0)),
81 lowLimit(0.02*keV), << 79 lowLimit(0.2*keV)
82 isInitialised(false) <<
83 { 80 {
84 theElectron = G4Electron::Electron(); 81 theElectron = G4Electron::Electron();
85 if(nullptr != p) { SetParticle(p); } << 82 if(p) SetParticle(p);
86 fParticleChange = nullptr; <<
87 } 83 }
88 84
89 //....oooOO0OOooo........oooOO0OOooo........oo 85 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
90 86
91 G4MollerBhabhaModel::~G4MollerBhabhaModel() = << 87 G4MollerBhabhaModel::~G4MollerBhabhaModel()
>> 88 {}
92 89
93 //....oooOO0OOooo........oooOO0OOooo........oo 90 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
94 91
95 G4double G4MollerBhabhaModel::MaxSecondaryEner << 92 void G4MollerBhabhaModel::SetParticle(const G4ParticleDefinition* p)
96 <<
97 { 93 {
98 G4double tmax = kinEnergy; << 94 particle = p;
99 if(isElectron) { tmax *= 0.5; } << 95 if(p != theElectron) isElectron = false;
100 return tmax; <<
101 } 96 }
102 97
103 //....oooOO0OOooo........oooOO0OOooo........oo 98 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
104 99
105 void G4MollerBhabhaModel::Initialise(const G4P << 100 G4double G4MollerBhabhaModel::MinEnergyCut(const G4ParticleDefinition*,
106 const G4D << 101 const G4MaterialCutsCouple* couple)
107 { 102 {
108 if(p != particle) { SetParticle(p); } << 103 G4double electronDensity = couple->GetMaterial()->GetElectronDensity();
>> 104 G4double Zeff = electronDensity/couple->GetMaterial()->GetTotNbOfAtomsPerVolume();
>> 105 return 0.25*sqrt(Zeff)*keV;
>> 106 }
109 107
110 if(isInitialised) { return; } << 108 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
111 109
112 isInitialised = true; << 110 void G4MollerBhabhaModel::Initialise(const G4ParticleDefinition* p,
113 fParticleChange = GetParticleChangeForLoss() << 111 const G4DataVector&)
114 if(UseAngularGeneratorFlag() && !GetAngularD << 112 {
115 SetAngularDistribution(new G4DeltaAngle()) << 113 if(!particle) SetParticle(p);
116 } << 114 if(pParticleChange)
>> 115 fParticleChange = reinterpret_cast<G4ParticleChangeForLoss*>
>> 116 (pParticleChange);
>> 117 else
>> 118 fParticleChange = new G4ParticleChangeForLoss();
117 } 119 }
118 120
119 //....oooOO0OOooo........oooOO0OOooo........oo 121 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
120 122
121 G4double G4MollerBhabhaModel::ComputeCrossSect 123 G4double G4MollerBhabhaModel::ComputeCrossSectionPerElectron(
122 const G4ParticleDefinition* p, G4doub << 124 const G4ParticleDefinition* p,
123 G4double cutEnergy, G4double maxEnergy) << 125 G4double kineticEnergy,
>> 126 G4double cutEnergy,
>> 127 G4double maxEnergy)
124 { 128 {
125 if(p != particle) { SetParticle(p); } << 129 if(!particle) SetParticle(p);
126 130
127 G4double cross = 0.0; 131 G4double cross = 0.0;
128 G4double tmax = MaxSecondaryEnergy(p, kineti 132 G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
129 tmax = std::min(maxEnergy, tmax); << 133 tmax = min(maxEnergy, tmax);
130 //G4cout << "E= " << kineticEnergy << " cut= << 134
131 // << " Emax= " << tmax << G4endl; <<
132 if(cutEnergy < tmax) { 135 if(cutEnergy < tmax) {
133 136
134 G4double xmin = cutEnergy/kineticEnergy; 137 G4double xmin = cutEnergy/kineticEnergy;
135 G4double xmax = tmax/kineticEnergy; 138 G4double xmax = tmax/kineticEnergy;
136 G4double tau = kineticEnergy/electron_ma << 139 G4double gam = kineticEnergy/electron_mass_c2 + 1.0;
137 G4double gam = tau + 1.0; <<
138 G4double gamma2= gam*gam; 140 G4double gamma2= gam*gam;
139 G4double beta2 = tau*(tau + 2)/gamma2; << 141 G4double beta2 = 1.0 - 1.0/gamma2;
140 142
141 //Moller (e-e-) scattering 143 //Moller (e-e-) scattering
142 if (isElectron) { 144 if (isElectron) {
143 145
144 G4double gg = (2.0*gam - 1.0)/gamma2; << 146 G4double g = (2.0*gam - 1.0)/gamma2;
145 cross = ((xmax - xmin)*(1.0 - gg + 1.0/( << 147 cross = ((xmax - xmin)*(1.0 - g + 1.0/(xmin*xmax)
146 + 1.0/((1.0-xmin << 148 + 1.0/((1.0-xmin)*(1.0 - xmax)))
147 - gg*G4Log( xmax*(1.0 - xmin)/(xmi << 149 - g*log( xmax*(1.0 - xmin)/(xmin*(1.0 - xmax)) ) ) / beta2;
148 150
149 //Bhabha (e+e-) scattering 151 //Bhabha (e+e-) scattering
150 } else { 152 } else {
151 153
152 G4double y = 1.0/(1.0 + gam); 154 G4double y = 1.0/(1.0 + gam);
153 G4double y2 = y*y; 155 G4double y2 = y*y;
154 G4double y12 = 1.0 - 2.0*y; 156 G4double y12 = 1.0 - 2.0*y;
155 G4double b1 = 2.0 - y2; 157 G4double b1 = 2.0 - y2;
156 G4double b2 = y12*(3.0 + y2); 158 G4double b2 = y12*(3.0 + y2);
157 G4double y122= y12*y12; 159 G4double y122= y12*y12;
158 G4double b4 = y122*y12; 160 G4double b4 = y122*y12;
159 G4double b3 = b4 + y122; 161 G4double b3 = b4 + y122;
160 162
161 cross = (xmax - xmin)*(1.0/(beta2*xmin*x 163 cross = (xmax - xmin)*(1.0/(beta2*xmin*xmax) + b2
162 - 0.5*b3*(xmin + xmax) 164 - 0.5*b3*(xmin + xmax)
163 + b4*(xmin*xmin + xmin*xmax + xmax << 165 + b4*(xmin*xmin + xmin*xmax + xmax*xmax)/3.0)
164 - b1*G4Log(xmax/xmin); << 166 - b1*log(xmax/xmin);
165 } 167 }
166 168
167 cross *= twopi_mc2_rcl2/kineticEnergy; 169 cross *= twopi_mc2_rcl2/kineticEnergy;
168 } 170 }
169 return cross; 171 return cross;
170 } 172 }
171 173
172 //....oooOO0OOooo........oooOO0OOooo........oo 174 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
173 175
174 G4double G4MollerBhabhaModel::ComputeCrossSect 176 G4double G4MollerBhabhaModel::ComputeCrossSectionPerAtom(
175 con 177 const G4ParticleDefinition* p,
176 178 G4double kineticEnergy,
177 << 179 G4double Z, G4double,
178 180 G4double cutEnergy,
179 181 G4double maxEnergy)
180 { 182 {
181 return Z*ComputeCrossSectionPerElectron(p,ki << 183 G4double cross = Z*ComputeCrossSectionPerElectron
>> 184 (p,kineticEnergy,cutEnergy,maxEnergy);
>> 185 return cross;
182 } 186 }
183 187
184 //....oooOO0OOooo........oooOO0OOooo........oo 188 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
185 189
186 G4double G4MollerBhabhaModel::CrossSectionPerV 190 G4double G4MollerBhabhaModel::CrossSectionPerVolume(
187 con << 191 const G4Material* material,
188 con 192 const G4ParticleDefinition* p,
189 << 193 G4double kineticEnergy,
190 194 G4double cutEnergy,
191 195 G4double maxEnergy)
192 { 196 {
193 G4double eDensity = material->GetElectronDen 197 G4double eDensity = material->GetElectronDensity();
194 return eDensity*ComputeCrossSectionPerElectr << 198 G4double cross = eDensity*ComputeCrossSectionPerElectron
>> 199 (p,kineticEnergy,cutEnergy,maxEnergy);
>> 200 return cross;
195 } 201 }
196 202
197 //....oooOO0OOooo........oooOO0OOooo........oo 203 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
198 204
199 G4double G4MollerBhabhaModel::ComputeDEDXPerVo 205 G4double G4MollerBhabhaModel::ComputeDEDXPerVolume(
200 cons << 206 const G4Material* material,
201 cons 207 const G4ParticleDefinition* p,
202 208 G4double kineticEnergy,
203 << 209 G4double cutEnergy)
204 { 210 {
205 if(p != particle) { SetParticle(p); } << 211 if(!particle) SetParticle(p);
206 // calculate the dE/dx due to the ionization 212 // calculate the dE/dx due to the ionization by Seltzer-Berger formula
207 // checl low-energy limit <<
208 G4double electronDensity = material->GetElec <<
209 213
210 G4double Zeff = material->GetIonisation()-> << 214 G4double electronDensity = material->GetElectronDensity();
>> 215 G4double Zeff = electronDensity/material->GetTotNbOfAtomsPerVolume();
211 G4double th = 0.25*sqrt(Zeff)*keV; 216 G4double th = 0.25*sqrt(Zeff)*keV;
212 G4double tkin = std::max(kineticEnergy, th); << 217 G4double tkin = kineticEnergy;
213 << 218 G4bool lowEnergy = false;
>> 219 if (kineticEnergy < th) {
>> 220 tkin = th;
>> 221 lowEnergy = true;
>> 222 }
214 G4double tau = tkin/electron_mass_c2; 223 G4double tau = tkin/electron_mass_c2;
215 G4double gam = tau + 1.0; 224 G4double gam = tau + 1.0;
216 G4double gamma2= gam*gam; 225 G4double gamma2= gam*gam;
217 G4double bg2 = tau*(tau + 2); << 226 G4double beta2 = 1. - 1./gamma2;
218 G4double beta2 = bg2/gamma2; << 227 G4double bg2 = beta2*gamma2;
219 228
220 G4double eexc = material->GetIonisation()-> 229 G4double eexc = material->GetIonisation()->GetMeanExcitationEnergy();
221 eexc /= electron_mass_c2; 230 eexc /= electron_mass_c2;
222 G4double eexc2 = eexc*eexc; 231 G4double eexc2 = eexc*eexc;
223 232
224 G4double d = std::min(cut, MaxSecondaryEnerg << 233 G4double d = min(cutEnergy, MaxSecondaryEnergy(p, tkin))/electron_mass_c2;
225 G4double dedx; 234 G4double dedx;
226 235
227 // electron 236 // electron
228 if (isElectron) { 237 if (isElectron) {
229 238
230 dedx = G4Log(2.0*(tau + 2.0)/eexc2) - 1.0 << 239 dedx = log(2.0*(tau + 2.0)/eexc2) - 1.0 - beta2
231 + G4Log((tau-d)*d) + tau/(tau-d) << 240 + log((tau-d)*d) + tau/(tau-d)
232 + (0.5*d*d + (2.0*tau + 1.)*G4Log(1. << 241 + (0.5*d*d + (2.0*tau + 1.)*log(1. - d/tau))/gamma2;
233 242
234 //positron 243 //positron
235 } else { 244 } else {
236 245
237 G4double d2 = d*d*0.5; 246 G4double d2 = d*d*0.5;
238 G4double d3 = d2*d/1.5; 247 G4double d3 = d2*d/1.5;
239 G4double d4 = d3*d*0.75; << 248 G4double d4 = d3*d*3.75;
240 G4double y = 1.0/(1.0 + gam); 249 G4double y = 1.0/(1.0 + gam);
241 dedx = G4Log(2.0*(tau + 2.0)/eexc2) + G4Lo << 250 dedx = log(2.0*(tau + 2.0)/eexc2) + log(tau*d)
242 - beta2*(tau + 2.0*d - y*(3.0*d2 251 - beta2*(tau + 2.0*d - y*(3.0*d2
243 + y*(d - d3 + y*(d2 - tau*d3 + d4)))) 252 + y*(d - d3 + y*(d2 - tau*d3 + d4))))/tau;
244 } 253 }
245 254
246 //density correction 255 //density correction
247 G4double x = G4Log(bg2)/twoln10; << 256 G4double cden = material->GetIonisation()->GetCdensity();
248 dedx -= material->GetIonisation()->DensityCo << 257 G4double mden = material->GetIonisation()->GetMdensity();
>> 258 G4double aden = material->GetIonisation()->GetAdensity();
>> 259 G4double x0den = material->GetIonisation()->GetX0density();
>> 260 G4double x1den = material->GetIonisation()->GetX1density();
>> 261 G4double x = log(bg2)/twoln10;
>> 262
>> 263 if (x >= x0den) {
>> 264 dedx -= twoln10*x - cden;
>> 265 if (x < x1den) dedx -= aden*pow(x1den-x, mden);
>> 266 }
249 267
250 // now you can compute the total ionization 268 // now you can compute the total ionization loss
251 dedx *= twopi_mc2_rcl2*electronDensity/beta2 269 dedx *= twopi_mc2_rcl2*electronDensity/beta2;
252 if (dedx < 0.0) { dedx = 0.0; } << 270 if (dedx < 0.0) dedx = 0.0;
253 << 271
254 // lowenergy extrapolation 272 // lowenergy extrapolation
255 << 273
256 if (kineticEnergy < th) { << 274 if (lowEnergy) {
257 x = kineticEnergy/th; << 275
258 if(x > 0.25) { dedx /= sqrt(x); } << 276 if (kineticEnergy >= lowLimit) dedx *= sqrt(tkin/kineticEnergy);
259 else { dedx *= 1.4*sqrt(x)/(0.1 + x); } << 277 else dedx *= sqrt(tkin*kineticEnergy)/lowLimit;
>> 278
260 } 279 }
261 return dedx; 280 return dedx;
262 } 281 }
263 282
264 //....oooOO0OOooo........oooOO0OOooo........oo 283 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
265 284
266 void << 285 void G4MollerBhabhaModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
267 G4MollerBhabhaModel::SampleSecondaries(std::ve << 286 const G4MaterialCutsCouple*,
268 const G << 287 const G4DynamicParticle* dp,
269 const G << 288 G4double tmin,
270 G4doubl << 289 G4double maxEnergy)
271 G4doubl <<
272 { 290 {
273 G4double kineticEnergy = dp->GetKineticEnerg << 291 G4double tmax = std::min(maxEnergy, MaxSecondaryKinEnergy(dp));
274 //G4cout << "G4MollerBhabhaModel::SampleSeco << 292 if(tmin >= tmax) return;
275 // << " in " << couple->GetMaterial()- <<
276 G4double tmax; <<
277 G4double tmin = cutEnergy; <<
278 if(isElectron) { <<
279 tmax = 0.5*kineticEnergy; <<
280 } else { <<
281 tmax = kineticEnergy; <<
282 } <<
283 if(maxEnergy < tmax) { tmax = maxEnergy; } <<
284 if(tmin >= tmax) { return; } <<
285 293
>> 294 G4double kineticEnergy = dp->GetKineticEnergy();
286 G4double energy = kineticEnergy + electron_m 295 G4double energy = kineticEnergy + electron_mass_c2;
>> 296 G4double totalMomentum = sqrt(kineticEnergy*(energy + electron_mass_c2));
287 G4double xmin = tmin/kineticEnergy; 297 G4double xmin = tmin/kineticEnergy;
288 G4double xmax = tmax/kineticEnergy; 298 G4double xmax = tmax/kineticEnergy;
289 G4double gam = energy/electron_mass_c2; 299 G4double gam = energy/electron_mass_c2;
290 G4double gamma2 = gam*gam; 300 G4double gamma2 = gam*gam;
291 G4double beta2 = 1.0 - 1.0/gamma2; 301 G4double beta2 = 1.0 - 1.0/gamma2;
292 G4double x, z, grej; << 302 G4double x, z, q, grej;
293 CLHEP::HepRandomEngine* rndmEngine = G4Rando << 303
294 G4double rndm[2]; << 304 G4ThreeVector direction = dp->GetMomentumDirection();
295 305
296 //Moller (e-e-) scattering 306 //Moller (e-e-) scattering
297 if (isElectron) { 307 if (isElectron) {
298 308
299 G4double gg = (2.0*gam - 1.0)/gamma2; << 309 G4double g = (2.0*gam - 1.0)/gamma2;
300 G4double y = 1.0 - xmax; 310 G4double y = 1.0 - xmax;
301 grej = 1.0 - gg*xmax + xmax*xmax*(1.0 - gg << 311 grej = 1.0 - g*xmax + xmax*xmax*(1.0 - g + (1.0 - g*y)/(y*y));
302 312
303 do { 313 do {
304 rndmEngine->flatArray(2, rndm); << 314 q = G4UniformRand();
305 x = xmin*xmax/(xmin*(1.0 - rndm[0]) + xm << 315 x = xmin*xmax/(xmin*(1.0 - q) + xmax*q);
306 y = 1.0 - x; 316 y = 1.0 - x;
307 z = 1.0 - gg*x + x*x*(1.0 - gg + (1.0 - << 317 z = 1.0 - g*x + x*x*(1.0 - g + (1.0 - g*y)/(y*y));
308 /* 318 /*
309 if(z > grej) { 319 if(z > grej) {
310 G4cout << "G4MollerBhabhaModel::Sample 320 G4cout << "G4MollerBhabhaModel::SampleSecondary Warning! "
311 << "Majorant " << grej << " < " 321 << "Majorant " << grej << " < "
312 << z << " for x= " << x 322 << z << " for x= " << x
313 << " e-e- scattering" 323 << " e-e- scattering"
314 << G4endl; 324 << G4endl;
315 } 325 }
316 */ 326 */
317 // Loop checking, 03-Aug-2015, Vladimir << 327 } while(grej * G4UniformRand() > z);
318 } while(grej * rndm[1] > z); <<
319 328
320 //Bhabha (e+e-) scattering 329 //Bhabha (e+e-) scattering
321 } else { 330 } else {
322 331
323 G4double y = 1.0/(1.0 + gam); 332 G4double y = 1.0/(1.0 + gam);
324 G4double y2 = y*y; 333 G4double y2 = y*y;
325 G4double y12 = 1.0 - 2.0*y; 334 G4double y12 = 1.0 - 2.0*y;
326 G4double b1 = 2.0 - y2; 335 G4double b1 = 2.0 - y2;
327 G4double b2 = y12*(3.0 + y2); 336 G4double b2 = y12*(3.0 + y2);
328 G4double y122= y12*y12; 337 G4double y122= y12*y12;
329 G4double b4 = y122*y12; 338 G4double b4 = y122*y12;
330 G4double b3 = b4 + y122; 339 G4double b3 = b4 + y122;
331 340
332 y = xmax*xmax; << 341 y = xmax*xmax;
333 grej = 1.0 + (y*y*b4 - xmin*xmin*xmin*b3 + << 342 grej = -xmin*b1;
>> 343 grej += y*b2;
>> 344 grej -= xmin*xmin*xmin*b3;
>> 345 grej += y*y*b4;
>> 346 grej *= beta2;
>> 347 grej += 1.0;
334 do { 348 do {
335 rndmEngine->flatArray(2, rndm); << 349 q = G4UniformRand();
336 x = xmin*xmax/(xmin*(1.0 - rndm[0]) + xm << 350 x = xmin*xmax/(xmin*(1.0 - q) + xmax*q);
337 y = x*x; << 351 z = -x*b1;
338 z = 1.0 + (y*y*b4 - x*y*b3 + y*b2 - x*b1 << 352 y = x*x;
>> 353 z += y*b2;
>> 354 y *= x;
>> 355 z -= y*b3;
>> 356 y *= x;
>> 357 z += y*b4;
>> 358 z *= beta2;
>> 359 z += 1.0;
339 /* 360 /*
340 if(z > grej) { 361 if(z > grej) {
341 G4cout << "G4MollerBhabhaModel::Sample 362 G4cout << "G4MollerBhabhaModel::SampleSecondary Warning! "
342 << "Majorant " << grej << " < " 363 << "Majorant " << grej << " < "
343 << z << " for x= " << x 364 << z << " for x= " << x
344 << " e+e- scattering" 365 << " e+e- scattering"
345 << G4endl; 366 << G4endl;
346 } 367 }
347 */ 368 */
348 // Loop checking, 03-Aug-2015, Vladimir << 369 } while(grej * G4UniformRand() > z);
349 } while(grej * rndm[1] > z); <<
350 } 370 }
351 371
352 G4double deltaKinEnergy = x * kineticEnergy; 372 G4double deltaKinEnergy = x * kineticEnergy;
353 373
354 G4ThreeVector deltaDirection; << 374 G4double deltaMomentum =
>> 375 sqrt(deltaKinEnergy * (deltaKinEnergy + 2.0*electron_mass_c2));
>> 376 G4double cost = deltaKinEnergy * (energy + electron_mass_c2) /
>> 377 (deltaMomentum * totalMomentum);
>> 378 G4double sint = 1.0 - cost*cost;
>> 379 if(sint > 0.0) sint = sqrt(sint);
355 380
356 if(UseAngularGeneratorFlag()) { << 381 G4double phi = twopi * G4UniformRand() ;
357 const G4Material* mat = couple->GetMateri <<
358 G4int Z = SelectRandomAtomNumber(mat); <<
359 382
360 deltaDirection = << 383 G4ThreeVector deltaDirection(sint*cos(phi),sint*sin(phi), cost) ;
361 GetAngularDistribution()->SampleDirectio << 384 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); <<
381 385
382 // primary change 386 // primary change
383 kineticEnergy -= deltaKinEnergy; 387 kineticEnergy -= deltaKinEnergy;
384 G4ThreeVector finalP = dp->GetMomentum() - d <<
385 finalP = finalP.unit(); <<
386 <<
387 fParticleChange->SetProposedKineticEnergy(ki 388 fParticleChange->SetProposedKineticEnergy(kineticEnergy);
388 fParticleChange->SetProposedMomentumDirectio << 389
>> 390 if(kineticEnergy > DBL_MIN) {
>> 391 G4ThreeVector dir = totalMomentum*direction - deltaMomentum*deltaDirection;
>> 392 direction = dir.unit();
>> 393 fParticleChange->SetProposedMomentumDirection(direction);
>> 394 }
>> 395
>> 396 // create G4DynamicParticle object for delta ray
>> 397 G4DynamicParticle* delta = new G4DynamicParticle(theElectron,
>> 398 deltaDirection,deltaKinEnergy);
>> 399 vdp->push_back(delta);
389 } 400 }
390 401
391 //....oooOO0OOooo........oooOO0OOooo........oo 402 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
392 403