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26 26
27 // G4 Low energy model: n-p scattering << 27 // G4 Low energy model: n-p scattering
28 // F.W. Jones, L.G. Greeniaus, H.P. Wellisch << 28 // F.W. Jones, L.G. Greeniaus, H.P. Wellisch
29 29
30 // 11-OCT-2007 F.W. Jones: removed erroneous c <<
31 // exchange of particles. <<
32 // FWJ 27-AUG-2010: extended to 5 GeV by Tony <<
33 30
34 #include "G4LEnp.hh" 31 #include "G4LEnp.hh"
35 #include "G4PhysicalConstants.hh" <<
36 #include "G4SystemOfUnits.hh" <<
37 #include "Randomize.hh" 32 #include "Randomize.hh"
38 #include "G4ios.hh" 33 #include "G4ios.hh"
39 34
40 // Initialization of static data arrays: 35 // Initialization of static data arrays:
41 #include "G4LEnpData.hh" 36 #include "G4LEnpData.hh"
42 #include "Randomize.hh" 37 #include "Randomize.hh"
43 38
44 #include "G4PhysicsModelCatalog.hh" <<
45 39
46 << 40 G4LEnp::G4LEnp() :
47 G4LEnp::G4LEnp(): << 41 G4HadronicInteraction()
48 G4HadronElastic("G4LEnp") // G4HadronicInter <<
49 { 42 {
50 secID = G4PhysicsModelCatalog::GetModelID( " <<
51 // theParticleChange.SetNumberOfSecondari 43 // theParticleChange.SetNumberOfSecondaries(1);
52 44
53 // SetMinEnergy(10.*MeV); 45 // SetMinEnergy(10.*MeV);
54 // SetMaxEnergy(1200.*MeV); 46 // SetMaxEnergy(1200.*MeV);
55 SetMinEnergy(0.); 47 SetMinEnergy(0.);
56 SetMaxEnergy(5.*GeV); << 48 SetMaxEnergy(1200.*GeV);
57 } 49 }
58 50
59 G4LEnp::~G4LEnp() 51 G4LEnp::~G4LEnp()
60 { 52 {
61 theParticleChange.Clear(); 53 theParticleChange.Clear();
62 } 54 }
63 55
64 G4HadFinalState* 56 G4HadFinalState*
65 G4LEnp::ApplyYourself(const G4HadProjectile& a 57 G4LEnp::ApplyYourself(const G4HadProjectile& aTrack, G4Nucleus& targetNucleus)
66 { 58 {
67 theParticleChange.Clear(); 59 theParticleChange.Clear();
68 const G4HadProjectile* aParticle = &aTrack 60 const G4HadProjectile* aParticle = &aTrack;
69 61
70 G4double P = aParticle->GetTotalMomentum() 62 G4double P = aParticle->GetTotalMomentum();
71 G4double Px = aParticle->Get4Momentum().x( 63 G4double Px = aParticle->Get4Momentum().x();
72 G4double Py = aParticle->Get4Momentum().y( 64 G4double Py = aParticle->Get4Momentum().y();
73 G4double Pz = aParticle->Get4Momentum().z( 65 G4double Pz = aParticle->Get4Momentum().z();
74 G4double ek = aParticle->GetKineticEnergy( 66 G4double ek = aParticle->GetKineticEnergy();
75 G4ThreeVector theInitial = aParticle->Get4 67 G4ThreeVector theInitial = aParticle->Get4Momentum().vect();
76 68
77 if (verboseLevel > 1) { 69 if (verboseLevel > 1) {
78 G4double E = aParticle->GetTotalEnergy() 70 G4double E = aParticle->GetTotalEnergy();
79 G4double E0 = aParticle->GetDefinition() 71 G4double E0 = aParticle->GetDefinition()->GetPDGMass();
80 G4double Q = aParticle->GetDefinition()- 72 G4double Q = aParticle->GetDefinition()->GetPDGCharge();
81 G4int A = targetNucleus.GetA_asInt(); << 73 G4double N = targetNucleus.GetN();
82 G4int Z = targetNucleus.GetZ_asInt(); << 74 G4double Z = targetNucleus.GetZ();
83 G4cout << "G4LEnp:ApplyYourself: inciden 75 G4cout << "G4LEnp:ApplyYourself: incident particle: "
84 << aParticle->GetDefinition()->Ge 76 << aParticle->GetDefinition()->GetParticleName() << G4endl;
85 G4cout << "P = " << P/GeV << " GeV/c" 77 G4cout << "P = " << P/GeV << " GeV/c"
86 << ", Px = " << Px/GeV << " GeV/c 78 << ", Px = " << Px/GeV << " GeV/c"
87 << ", Py = " << Py/GeV << " GeV/c 79 << ", Py = " << Py/GeV << " GeV/c"
88 << ", Pz = " << Pz/GeV << " GeV/c 80 << ", Pz = " << Pz/GeV << " GeV/c" << G4endl;
89 G4cout << "E = " << E/GeV << " GeV" 81 G4cout << "E = " << E/GeV << " GeV"
90 << ", kinetic energy = " << ek/Ge 82 << ", kinetic energy = " << ek/GeV << " GeV"
91 << ", mass = " << E0/GeV << " GeV 83 << ", mass = " << E0/GeV << " GeV"
92 << ", charge = " << Q << G4endl; 84 << ", charge = " << Q << G4endl;
93 G4cout << "G4LEnp:ApplyYourself: materia 85 G4cout << "G4LEnp:ApplyYourself: material:" << G4endl;
94 G4cout << "A = " << A << 86 G4cout << "A = " << N
95 << ", Z = " << Z 87 << ", Z = " << Z
96 << ", atomic mass " 88 << ", atomic mass "
97 << G4Proton::Proton()->GetPDGMas 89 << G4Proton::Proton()->GetPDGMass()/GeV << "GeV"
98 << G4endl; 90 << G4endl;
99 // 91 //
100 // GHEISHA ADD operation to get total en 92 // GHEISHA ADD operation to get total energy, mass, charge
101 // 93 //
102 E += proton_mass_c2; << 94 E += G4Proton::Proton()->GetPDGMass();
103 G4double E02 = E*E - P*P; 95 G4double E02 = E*E - P*P;
104 E0 = std::sqrt(std::abs(E02)); 96 E0 = std::sqrt(std::abs(E02));
105 if (E02 < 0)E0 *= -1; 97 if (E02 < 0)E0 *= -1;
106 Q += Z; 98 Q += Z;
107 G4cout << "G4LEnp:ApplyYourself: total:" 99 G4cout << "G4LEnp:ApplyYourself: total:" << G4endl;
108 G4cout << "E = " << E/GeV << " GeV" 100 G4cout << "E = " << E/GeV << " GeV"
109 << ", mass = " << E0/GeV << " GeV 101 << ", mass = " << E0/GeV << " GeV"
110 << ", charge = " << Q << G4endl; 102 << ", charge = " << Q << G4endl;
111 } 103 }
112 104
113 // Find energy bin 105 // Find energy bin
114 106
115 G4int je1 = 0; 107 G4int je1 = 0;
116 G4int je2 = NENERGY - 1; 108 G4int je2 = NENERGY - 1;
117 ek = ek/GeV; 109 ek = ek/GeV;
118 do { 110 do {
119 G4int midBin = (je1 + je2)/2; 111 G4int midBin = (je1 + je2)/2;
120 if (ek < elab[midBin]) 112 if (ek < elab[midBin])
121 je2 = midBin; 113 je2 = midBin;
122 else 114 else
123 je1 = midBin; 115 je1 = midBin;
124 } while (je2 - je1 > 1); /* Loop checking << 116 } while (je2 - je1 > 1);
>> 117 // G4int j;
>> 118 //std::abs(ek-elab[je1]) < std::abs(ek-elab[je2]) ? j = je1 : j = je2;
125 G4double delab = elab[je2] - elab[je1]; 119 G4double delab = elab[je2] - elab[je1];
126 120
127 // Sample the angle 121 // Sample the angle
128 122
129 G4double sample = G4UniformRand(); << 123 G4float sample = G4UniformRand();
130 G4int ke1 = 0; 124 G4int ke1 = 0;
131 G4int ke2 = NANGLE - 1; 125 G4int ke2 = NANGLE - 1;
132 G4double dsig = sig[je2][0] - sig[je1][0]; 126 G4double dsig = sig[je2][0] - sig[je1][0];
133 G4double rc = dsig/delab; 127 G4double rc = dsig/delab;
134 G4double b = sig[je1][0] - rc*elab[je1]; 128 G4double b = sig[je1][0] - rc*elab[je1];
135 G4double sigint1 = rc*ek + b; 129 G4double sigint1 = rc*ek + b;
136 G4double sigint2 = 0.; 130 G4double sigint2 = 0.;
137 131
138 if (verboseLevel > 1) { << 132 if (verboseLevel > 1) G4cout << "sample=" << sample << G4endl
139 G4cout << "sample=" << sample << G4endl << 133 << ke1 << " " << ke2 << " "
140 << ke1 << " " << ke2 << " " << 134 << sigint1 << " " << sigint2 << G4endl;
141 << sigint1 << " " << sigint2 << G4endl; << 135
142 } <<
143 do { 136 do {
144 G4int midBin = (ke1 + ke2)/2; 137 G4int midBin = (ke1 + ke2)/2;
145 dsig = sig[je2][midBin] - sig[je1][midBi 138 dsig = sig[je2][midBin] - sig[je1][midBin];
146 rc = dsig/delab; 139 rc = dsig/delab;
147 b = sig[je1][midBin] - rc*elab[je1]; 140 b = sig[je1][midBin] - rc*elab[je1];
148 G4double sigint = rc*ek + b; 141 G4double sigint = rc*ek + b;
149 if (sample < sigint) { 142 if (sample < sigint) {
150 ke2 = midBin; 143 ke2 = midBin;
151 sigint2 = sigint; 144 sigint2 = sigint;
152 } 145 }
153 else { 146 else {
154 ke1 = midBin; 147 ke1 = midBin;
155 sigint1 = sigint; 148 sigint1 = sigint;
156 } 149 }
157 if (verboseLevel > 1) { << 150 if (verboseLevel > 1)G4cout << ke1 << " " << ke2 << " "
158 G4cout << ke1 << " " << ke2 << " " << 151 << sigint1 << " " << sigint2 << G4endl;
159 << sigint1 << " " << sigint2 << G4end << 152 } while (ke2 - ke1 > 1);
160 } << 153
161 } while (ke2 - ke1 > 1); /* Loop checking << 154 // sigint1 and sigint2 should be recoverable from above loop
>> 155
>> 156 // G4double dsig = sig[je2][ke1] - sig[je1][ke1];
>> 157 // G4double rc = dsig/delab;
>> 158 // G4double b = sig[je1][ke1] - rc*elab[je1];
>> 159 // G4double sigint1 = rc*ek + b;
>> 160
>> 161 // G4double dsig = sig[je2][ke2] - sig[je1][ke2];
>> 162 // G4double rc = dsig/delab;
>> 163 // G4double b = sig[je1][ke2] - rc*elab[je1];
>> 164 // G4double sigint2 = rc*ek + b;
162 165
163 dsig = sigint2 - sigint1; 166 dsig = sigint2 - sigint1;
164 rc = 1./dsig; 167 rc = 1./dsig;
165 b = ke1 - rc*sigint1; 168 b = ke1 - rc*sigint1;
166 G4double kint = rc*sample + b; 169 G4double kint = rc*sample + b;
167 G4double theta = (0.5 + kint)*pi/180.; 170 G4double theta = (0.5 + kint)*pi/180.;
168 171
>> 172 // G4int k;
>> 173 //std::abs(sample-sig[j][ke1]) < std::abs(sample-sig[j][ke2]) ? k = ke1 : k = ke2;
>> 174 // G4double theta = (0.5 + k)*pi/180.;
>> 175
169 if (verboseLevel > 1) { 176 if (verboseLevel > 1) {
170 G4cout << " energy bin " << je1 << " e 177 G4cout << " energy bin " << je1 << " energy=" << elab[je1] << G4endl;
171 G4cout << " angle bin " << kint << " a 178 G4cout << " angle bin " << kint << " angle=" << theta/degree << G4endl;
172 } 179 }
173 180
>> 181
174 // Get the target particle 182 // Get the target particle
175 183
176 G4DynamicParticle* targetParticle = target 184 G4DynamicParticle* targetParticle = targetNucleus.ReturnTargetParticle();
177 185
178 G4double E1 = aParticle->GetTotalEnergy(); 186 G4double E1 = aParticle->GetTotalEnergy();
179 G4double M1 = aParticle->GetDefinition()-> 187 G4double M1 = aParticle->GetDefinition()->GetPDGMass();
180 G4double E2 = targetParticle->GetTotalEner 188 G4double E2 = targetParticle->GetTotalEnergy();
181 G4double M2 = targetParticle->GetDefinitio 189 G4double M2 = targetParticle->GetDefinition()->GetPDGMass();
182 G4double totalEnergy = E1 + E2; 190 G4double totalEnergy = E1 + E2;
183 G4double pseudoMass = std::sqrt(totalEnerg 191 G4double pseudoMass = std::sqrt(totalEnergy*totalEnergy - P*P);
>> 192 // pseudoMass also = std::sqrt(M1*M1 + M2*M2 + 2*M2*E1)
184 193
185 // Transform into centre of mass system 194 // Transform into centre of mass system
186 195
187 G4double px = (M2/pseudoMass)*Px; 196 G4double px = (M2/pseudoMass)*Px;
188 G4double py = (M2/pseudoMass)*Py; 197 G4double py = (M2/pseudoMass)*Py;
189 G4double pz = (M2/pseudoMass)*Pz; 198 G4double pz = (M2/pseudoMass)*Pz;
190 G4double p = std::sqrt(px*px + py*py + pz* 199 G4double p = std::sqrt(px*px + py*py + pz*pz);
191 200
192 if (verboseLevel > 1) { 201 if (verboseLevel > 1) {
193 G4cout << " E1, M1 (GeV) " << E1/GeV << 202 G4cout << " E1, M1 (GeV) " << E1/GeV << " " << M1/GeV << G4endl;
194 G4cout << " E2, M2 (GeV) " << E2/GeV << 203 G4cout << " E2, M2 (GeV) " << E2/GeV << " " << M2/GeV << G4endl;
195 G4cout << " particle 1 momentum in CM 204 G4cout << " particle 1 momentum in CM " << px/GeV << " " << py/GeV << " "
196 << pz/GeV << " " << p/GeV << G4endl 205 << pz/GeV << " " << p/GeV << G4endl;
197 } 206 }
198 207
199 // First scatter w.r.t. Z axis 208 // First scatter w.r.t. Z axis
200 G4double phi = G4UniformRand()*twopi; 209 G4double phi = G4UniformRand()*twopi;
201 G4double pxnew = p*std::sin(theta)*std::co 210 G4double pxnew = p*std::sin(theta)*std::cos(phi);
202 G4double pynew = p*std::sin(theta)*std::si 211 G4double pynew = p*std::sin(theta)*std::sin(phi);
203 G4double pznew = p*std::cos(theta); 212 G4double pznew = p*std::cos(theta);
204 213
205 // Rotate according to the direction of th 214 // Rotate according to the direction of the incident particle
206 if (px*px + py*py > 0) { 215 if (px*px + py*py > 0) {
207 G4double cost, sint, ph, cosp, sinp; 216 G4double cost, sint, ph, cosp, sinp;
208 cost = pz/p; 217 cost = pz/p;
209 sint = (std::sqrt(std::fabs((1-cost)*(1+ << 218 sint = (std::sqrt(std::abs((1-cost)*(1+cost))) + std::sqrt(px*px+py*py)/p)/2;
210 py < 0 ? ph = 3*halfpi : ph = halfpi; 219 py < 0 ? ph = 3*halfpi : ph = halfpi;
211 if (std::abs(px) > 0.000001*GeV) ph = st 220 if (std::abs(px) > 0.000001*GeV) ph = std::atan2(py,px);
212 cosp = std::cos(ph); 221 cosp = std::cos(ph);
213 sinp = std::sin(ph); 222 sinp = std::sin(ph);
214 px = (cost*cosp*pxnew - sinp*pynew + sin 223 px = (cost*cosp*pxnew - sinp*pynew + sint*cosp*pznew);
215 py = (cost*sinp*pxnew + cosp*pynew + sin 224 py = (cost*sinp*pxnew + cosp*pynew + sint*sinp*pznew);
216 pz = (-sint*pxnew + cos 225 pz = (-sint*pxnew + cost*pznew);
>> 226 // G4ThreeVector it(a,b,c);
>> 227 // p0->SetMomentum(it);
>> 228 // G4ThreeVector aTargetMom = theInitial - it;
>> 229 // targetParticle->SetMomentum(aTargetMom);
217 } 230 }
218 else { 231 else {
219 px = pxnew; 232 px = pxnew;
220 py = pynew; 233 py = pynew;
221 pz = pznew; 234 pz = pznew;
222 } 235 }
223 236
224 if (verboseLevel > 1) { 237 if (verboseLevel > 1) {
225 G4cout << " AFTER SCATTER..." << G4endl 238 G4cout << " AFTER SCATTER..." << G4endl;
226 G4cout << " particle 1 momentum in CM " 239 G4cout << " particle 1 momentum in CM " << px/GeV << " " << py/GeV << " "
227 << pz/GeV << " " << p/GeV << G4endl 240 << pz/GeV << " " << p/GeV << G4endl;
228 } 241 }
229 242
230 // Transform to lab system 243 // Transform to lab system
231 244
232 G4double E1pM2 = E1 + M2; 245 G4double E1pM2 = E1 + M2;
233 G4double betaCM = P/E1pM2; 246 G4double betaCM = P/E1pM2;
234 G4double betaCMx = Px/E1pM2; 247 G4double betaCMx = Px/E1pM2;
235 G4double betaCMy = Py/E1pM2; 248 G4double betaCMy = Py/E1pM2;
236 G4double betaCMz = Pz/E1pM2; 249 G4double betaCMz = Pz/E1pM2;
237 G4double gammaCM = E1pM2/std::sqrt(E1pM2*E 250 G4double gammaCM = E1pM2/std::sqrt(E1pM2*E1pM2 - P*P);
238 251
239 if (verboseLevel > 1) { 252 if (verboseLevel > 1) {
240 G4cout << " betaCM " << betaCMx << " " 253 G4cout << " betaCM " << betaCMx << " " << betaCMy << " "
241 << betaCMz << " " << betaCM << G4 254 << betaCMz << " " << betaCM << G4endl;
242 G4cout << " gammaCM " << gammaCM << G4e 255 G4cout << " gammaCM " << gammaCM << G4endl;
243 } 256 }
244 257
245 // Now following GLOREN... 258 // Now following GLOREN...
246 259
247 G4double BETA[5], PA[5], PB[5]; 260 G4double BETA[5], PA[5], PB[5];
248 BETA[1] = -betaCMx; 261 BETA[1] = -betaCMx;
249 BETA[2] = -betaCMy; 262 BETA[2] = -betaCMy;
250 BETA[3] = -betaCMz; 263 BETA[3] = -betaCMz;
251 BETA[4] = gammaCM; 264 BETA[4] = gammaCM;
252 265
253 //The incident particle... 266 //The incident particle...
254 267
255 PA[1] = px; 268 PA[1] = px;
256 PA[2] = py; 269 PA[2] = py;
257 PA[3] = pz; 270 PA[3] = pz;
258 PA[4] = std::sqrt(M1*M1 + p*p); 271 PA[4] = std::sqrt(M1*M1 + p*p);
259 272
260 G4double BETPA = BETA[1]*PA[1] + BETA[2]* 273 G4double BETPA = BETA[1]*PA[1] + BETA[2]*PA[2] + BETA[3]*PA[3];
261 G4double BPGAM = (BETPA * BETA[4]/(BETA[4 274 G4double BPGAM = (BETPA * BETA[4]/(BETA[4] + 1.) - PA[4]) * BETA[4];
262 275
263 PB[1] = PA[1] + BPGAM * BETA[1]; 276 PB[1] = PA[1] + BPGAM * BETA[1];
264 PB[2] = PA[2] + BPGAM * BETA[2]; 277 PB[2] = PA[2] + BPGAM * BETA[2];
265 PB[3] = PA[3] + BPGAM * BETA[3]; 278 PB[3] = PA[3] + BPGAM * BETA[3];
266 PB[4] = (PA[4] - BETPA) * BETA[4]; 279 PB[4] = (PA[4] - BETPA) * BETA[4];
267 280
268 G4DynamicParticle* newP = new G4DynamicPar 281 G4DynamicParticle* newP = new G4DynamicParticle;
269 newP->SetDefinition(aParticle->GetDefiniti << 282 newP->SetDefinition(const_cast<G4ParticleDefinition *>(aParticle->GetDefinition()));
270 newP->SetMomentum(G4ThreeVector(PB[1], PB[ 283 newP->SetMomentum(G4ThreeVector(PB[1], PB[2], PB[3]));
271 284
272 //The target particle... 285 //The target particle...
273 286
274 PA[1] = -px; 287 PA[1] = -px;
275 PA[2] = -py; 288 PA[2] = -py;
276 PA[3] = -pz; 289 PA[3] = -pz;
277 PA[4] = std::sqrt(M2*M2 + p*p); 290 PA[4] = std::sqrt(M2*M2 + p*p);
278 291
279 BETPA = BETA[1]*PA[1] + BETA[2]*PA[2] + B 292 BETPA = BETA[1]*PA[1] + BETA[2]*PA[2] + BETA[3]*PA[3];
280 BPGAM = (BETPA * BETA[4]/(BETA[4] + 1.) - 293 BPGAM = (BETPA * BETA[4]/(BETA[4] + 1.) - PA[4]) * BETA[4];
281 294
282 PB[1] = PA[1] + BPGAM * BETA[1]; 295 PB[1] = PA[1] + BPGAM * BETA[1];
283 PB[2] = PA[2] + BPGAM * BETA[2]; 296 PB[2] = PA[2] + BPGAM * BETA[2];
284 PB[3] = PA[3] + BPGAM * BETA[3]; 297 PB[3] = PA[3] + BPGAM * BETA[3];
285 PB[4] = (PA[4] - BETPA) * BETA[4]; 298 PB[4] = (PA[4] - BETPA) * BETA[4];
286 299
287 targetParticle->SetMomentum(G4ThreeVector( 300 targetParticle->SetMomentum(G4ThreeVector(PB[1], PB[2], PB[3]));
288 301
289 if (verboseLevel > 1) { 302 if (verboseLevel > 1) {
290 G4cout << " particle 1 momentum in LAB 303 G4cout << " particle 1 momentum in LAB "
291 << newP->GetMomentum()*(1./GeV) 304 << newP->GetMomentum()*(1./GeV)
292 << " " << newP->GetTotalMomentum()/ 305 << " " << newP->GetTotalMomentum()/GeV << G4endl;
293 G4cout << " particle 2 momentum in LAB 306 G4cout << " particle 2 momentum in LAB "
294 << targetParticle->GetMomentum()*(1 307 << targetParticle->GetMomentum()*(1./GeV)
295 << " " << targetParticle->GetTotalM 308 << " " << targetParticle->GetTotalMomentum()/GeV << G4endl;
296 G4cout << " TOTAL momentum in LAB " 309 G4cout << " TOTAL momentum in LAB "
297 << (newP->GetMomentum()+targetParti 310 << (newP->GetMomentum()+targetParticle->GetMomentum())*(1./GeV)
298 << " " 311 << " "
299 << (newP->GetMomentum()+targetParti 312 << (newP->GetMomentum()+targetParticle->GetMomentum()).mag()/GeV
300 << G4endl; 313 << G4endl;
301 } 314 }
302 315
303 theParticleChange.SetMomentumChange(newP-> << 316 // charge symmetry....
304 theParticleChange.SetEnergyChange(newP->Ge << 317 if(G4UniformRand()<.5)
305 delete newP; << 318 {
306 theParticleChange.AddSecondary(targetParti << 319 theParticleChange.SetMomentumChange(newP->GetMomentumDirection());
307 << 320 theParticleChange.SetEnergyChange(newP->GetKineticEnergy());
>> 321 delete newP;
>> 322 G4DynamicParticle* p1 = new G4DynamicParticle;
>> 323 p1->SetDefinition(targetParticle->GetDefinition());
>> 324 p1->SetMomentum(targetParticle->GetMomentum());
>> 325 theParticleChange.AddSecondary(p1);
>> 326 }
>> 327 else
>> 328 {
>> 329 theParticleChange.SetStatusChange(stopAndKill);
>> 330 G4DynamicParticle * pA = new G4DynamicParticle;
>> 331 pA->SetDefinition(targetParticle->GetDefinition());
>> 332 pA->SetMomentum(newP->GetMomentum());
>> 333 G4DynamicParticle * pB = new G4DynamicParticle;
>> 334 pB->SetDefinition(newP->GetDefinition());
>> 335 pB->SetMomentum(targetParticle->GetMomentum());
>> 336 delete newP;
>> 337 theParticleChange.AddSecondary(pA);
>> 338 theParticleChange.AddSecondary(pB);
>> 339 }
308 return &theParticleChange; 340 return &theParticleChange;
309 } <<
310 <<
311 ////////////////////////////////////////////// <<
312 // <<
313 // sample momentum transfer using Lab. momentu <<
314 <<
315 G4double G4LEnp::SampleInvariantT(const G4Part <<
316 G4double plab, G4int , G4int ) <<
317 { <<
318 G4double nMass = p->GetPDGMass(); // 939.565 <<
319 G4double ek = std::sqrt(plab*plab+nMass*nMas <<
320 <<
321 // Find energy bin <<
322 <<
323 G4int je1 = 0; <<
324 G4int je2 = NENERGY - 1; <<
325 ek = ek/GeV; <<
326 <<
327 do <<
328 { <<
329 G4int midBin = (je1 + je2)/2; <<
330 if (ek < elab[midBin]) <<
331 je2 = midBin; <<
332 else <<
333 je1 = midBin; <<
334 } while (je2 - je1 > 1); /* Loop checking, <<
335 <<
336 G4double delab = elab[je2] - elab[je1]; <<
337 <<
338 // Sample the angle <<
339 <<
340 G4double sample = G4UniformRand(); <<
341 G4int ke1 = 0; <<
342 G4int ke2 = NANGLE - 1; <<
343 G4double dsig = sig[je2][0] - sig[je1][0]; <<
344 G4double rc = dsig/delab; <<
345 G4double b = sig[je1][0] - rc*elab[je1]; <<
346 G4double sigint1 = rc*ek + b; <<
347 G4double sigint2 = 0.; <<
348 <<
349 do <<
350 { <<
351 G4int midBin = (ke1 + ke2)/2; <<
352 dsig = sig[je2][midBin] - sig[je1][midBi <<
353 rc = dsig/delab; <<
354 b = sig[je1][midBin] - rc*elab[je1]; <<
355 G4double sigint = rc*ek + b; <<
356 <<
357 if (sample < sigint) <<
358 { <<
359 ke2 = midBin; <<
360 sigint2 = sigint; <<
361 } <<
362 else <<
363 { <<
364 ke1 = midBin; <<
365 sigint1 = sigint; <<
366 } <<
367 } while (ke2 - ke1 > 1); /* Loop checking, <<
368 <<
369 dsig = sigint2 - sigint1; <<
370 rc = 1./dsig; <<
371 b = ke1 - rc*sigint1; <<
372 <<
373 G4double kint = rc*sample + b; <<
374 G4double theta = (0.5 + kint)*pi/180.; <<
375 G4double t = 0.5*plab*plab*(1-std::cos(theta <<
376 <<
377 return t; <<
378 } 341 }
379 342
380 // end of file 343 // end of file
381 344