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