| 1 | //
|
|---|
| 2 | // ********************************************************************
|
|---|
| 3 | // * License and Disclaimer *
|
|---|
| 4 | // * *
|
|---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
|
|---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
|
|---|
| 7 | // * conditions of the Geant4 Software License, included in the file *
|
|---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
|
|---|
| 9 | // * include a list of copyright holders. *
|
|---|
| 10 | // * *
|
|---|
| 11 | // * Neither the authors of this software system, nor their employing *
|
|---|
| 12 | // * institutes,nor the agencies providing financial support for this *
|
|---|
| 13 | // * work make any representation or warranty, express or implied, *
|
|---|
| 14 | // * regarding this software system or assume any liability for its *
|
|---|
| 15 | // * use. Please see the license in the file LICENSE and URL above *
|
|---|
| 16 | // * for the full disclaimer and the limitation of liability. *
|
|---|
| 17 | // * *
|
|---|
| 18 | // * This code implementation is the result of the scientific and *
|
|---|
| 19 | // * technical work of the GEANT4 collaboration. *
|
|---|
| 20 | // * By using, copying, modifying or distributing the software (or *
|
|---|
| 21 | // * any work based on the software) you agree to acknowledge its *
|
|---|
| 22 | // * use in resulting scientific publications, and indicate your *
|
|---|
| 23 | // * acceptance of all terms of the Geant4 Software license. *
|
|---|
| 24 | // ********************************************************************
|
|---|
| 25 | //
|
|---|
| 26 |
|
|---|
| 27 | // G4 Low energy model: n-p scattering
|
|---|
| 28 | // F.W. Jones, L.G. Greeniaus, H.P. Wellisch
|
|---|
| 29 |
|
|---|
| 30 | // 11-OCT-2007 F.W. Jones: removed erroneous code for identity
|
|---|
| 31 | // exchange of particles.
|
|---|
| 32 |
|
|---|
| 33 | #include "G4LEnp.hh"
|
|---|
| 34 | #include "Randomize.hh"
|
|---|
| 35 | #include "G4ios.hh"
|
|---|
| 36 |
|
|---|
| 37 | // Initialization of static data arrays:
|
|---|
| 38 | #include "G4LEnpData.hh"
|
|---|
| 39 | #include "Randomize.hh"
|
|---|
| 40 |
|
|---|
| 41 |
|
|---|
| 42 | G4LEnp::G4LEnp():G4HadronicInteraction("G4LEnp")
|
|---|
| 43 | {
|
|---|
| 44 | // theParticleChange.SetNumberOfSecondaries(1);
|
|---|
| 45 |
|
|---|
| 46 | // SetMinEnergy(10.*MeV);
|
|---|
| 47 | // SetMaxEnergy(1200.*MeV);
|
|---|
| 48 | SetMinEnergy(0.);
|
|---|
| 49 | SetMaxEnergy(1200.*GeV);
|
|---|
| 50 | }
|
|---|
| 51 |
|
|---|
| 52 | G4LEnp::~G4LEnp()
|
|---|
| 53 | {
|
|---|
| 54 | theParticleChange.Clear();
|
|---|
| 55 | }
|
|---|
| 56 |
|
|---|
| 57 | G4HadFinalState*
|
|---|
| 58 | G4LEnp::ApplyYourself(const G4HadProjectile& aTrack, G4Nucleus& targetNucleus)
|
|---|
| 59 | {
|
|---|
| 60 | theParticleChange.Clear();
|
|---|
| 61 | const G4HadProjectile* aParticle = &aTrack;
|
|---|
| 62 |
|
|---|
| 63 | G4double P = aParticle->GetTotalMomentum();
|
|---|
| 64 | G4double Px = aParticle->Get4Momentum().x();
|
|---|
| 65 | G4double Py = aParticle->Get4Momentum().y();
|
|---|
| 66 | G4double Pz = aParticle->Get4Momentum().z();
|
|---|
| 67 | G4double ek = aParticle->GetKineticEnergy();
|
|---|
| 68 | G4ThreeVector theInitial = aParticle->Get4Momentum().vect();
|
|---|
| 69 |
|
|---|
| 70 | if (verboseLevel > 1) {
|
|---|
| 71 | G4double E = aParticle->GetTotalEnergy();
|
|---|
| 72 | G4double E0 = aParticle->GetDefinition()->GetPDGMass();
|
|---|
| 73 | G4double Q = aParticle->GetDefinition()->GetPDGCharge();
|
|---|
| 74 | G4double N = targetNucleus.GetN();
|
|---|
| 75 | G4double Z = targetNucleus.GetZ();
|
|---|
| 76 | G4cout << "G4LEnp:ApplyYourself: incident particle: "
|
|---|
| 77 | << aParticle->GetDefinition()->GetParticleName() << G4endl;
|
|---|
| 78 | G4cout << "P = " << P/GeV << " GeV/c"
|
|---|
| 79 | << ", Px = " << Px/GeV << " GeV/c"
|
|---|
| 80 | << ", Py = " << Py/GeV << " GeV/c"
|
|---|
| 81 | << ", Pz = " << Pz/GeV << " GeV/c" << G4endl;
|
|---|
| 82 | G4cout << "E = " << E/GeV << " GeV"
|
|---|
| 83 | << ", kinetic energy = " << ek/GeV << " GeV"
|
|---|
| 84 | << ", mass = " << E0/GeV << " GeV"
|
|---|
| 85 | << ", charge = " << Q << G4endl;
|
|---|
| 86 | G4cout << "G4LEnp:ApplyYourself: material:" << G4endl;
|
|---|
| 87 | G4cout << "A = " << N
|
|---|
| 88 | << ", Z = " << Z
|
|---|
| 89 | << ", atomic mass "
|
|---|
| 90 | << G4Proton::Proton()->GetPDGMass()/GeV << "GeV"
|
|---|
| 91 | << G4endl;
|
|---|
| 92 | //
|
|---|
| 93 | // GHEISHA ADD operation to get total energy, mass, charge
|
|---|
| 94 | //
|
|---|
| 95 | E += G4Proton::Proton()->GetPDGMass();
|
|---|
| 96 | G4double E02 = E*E - P*P;
|
|---|
| 97 | E0 = std::sqrt(std::abs(E02));
|
|---|
| 98 | if (E02 < 0)E0 *= -1;
|
|---|
| 99 | Q += Z;
|
|---|
| 100 | G4cout << "G4LEnp:ApplyYourself: total:" << G4endl;
|
|---|
| 101 | G4cout << "E = " << E/GeV << " GeV"
|
|---|
| 102 | << ", mass = " << E0/GeV << " GeV"
|
|---|
| 103 | << ", charge = " << Q << G4endl;
|
|---|
| 104 | }
|
|---|
| 105 |
|
|---|
| 106 | // Find energy bin
|
|---|
| 107 |
|
|---|
| 108 | G4int je1 = 0;
|
|---|
| 109 | G4int je2 = NENERGY - 1;
|
|---|
| 110 | ek = ek/GeV;
|
|---|
| 111 | do {
|
|---|
| 112 | G4int midBin = (je1 + je2)/2;
|
|---|
| 113 | if (ek < elab[midBin])
|
|---|
| 114 | je2 = midBin;
|
|---|
| 115 | else
|
|---|
| 116 | je1 = midBin;
|
|---|
| 117 | } while (je2 - je1 > 1);
|
|---|
| 118 | // G4int j;
|
|---|
| 119 | //std::abs(ek-elab[je1]) < std::abs(ek-elab[je2]) ? j = je1 : j = je2;
|
|---|
| 120 | G4double delab = elab[je2] - elab[je1];
|
|---|
| 121 |
|
|---|
| 122 | // Sample the angle
|
|---|
| 123 |
|
|---|
| 124 | G4float sample = G4UniformRand();
|
|---|
| 125 | G4int ke1 = 0;
|
|---|
| 126 | G4int ke2 = NANGLE - 1;
|
|---|
| 127 | G4double dsig = sig[je2][0] - sig[je1][0];
|
|---|
| 128 | G4double rc = dsig/delab;
|
|---|
| 129 | G4double b = sig[je1][0] - rc*elab[je1];
|
|---|
| 130 | G4double sigint1 = rc*ek + b;
|
|---|
| 131 | G4double sigint2 = 0.;
|
|---|
| 132 |
|
|---|
| 133 | if (verboseLevel > 1) G4cout << "sample=" << sample << G4endl
|
|---|
| 134 | << ke1 << " " << ke2 << " "
|
|---|
| 135 | << sigint1 << " " << sigint2 << G4endl;
|
|---|
| 136 |
|
|---|
| 137 | do {
|
|---|
| 138 | G4int midBin = (ke1 + ke2)/2;
|
|---|
| 139 | dsig = sig[je2][midBin] - sig[je1][midBin];
|
|---|
| 140 | rc = dsig/delab;
|
|---|
| 141 | b = sig[je1][midBin] - rc*elab[je1];
|
|---|
| 142 | G4double sigint = rc*ek + b;
|
|---|
| 143 | if (sample < sigint) {
|
|---|
| 144 | ke2 = midBin;
|
|---|
| 145 | sigint2 = sigint;
|
|---|
| 146 | }
|
|---|
| 147 | else {
|
|---|
| 148 | ke1 = midBin;
|
|---|
| 149 | sigint1 = sigint;
|
|---|
| 150 | }
|
|---|
| 151 | if (verboseLevel > 1)G4cout << ke1 << " " << ke2 << " "
|
|---|
| 152 | << sigint1 << " " << sigint2 << G4endl;
|
|---|
| 153 | } while (ke2 - ke1 > 1);
|
|---|
| 154 |
|
|---|
| 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;
|
|---|
| 166 |
|
|---|
| 167 | dsig = sigint2 - sigint1;
|
|---|
| 168 | rc = 1./dsig;
|
|---|
| 169 | b = ke1 - rc*sigint1;
|
|---|
| 170 | G4double kint = rc*sample + b;
|
|---|
| 171 | G4double theta = (0.5 + kint)*pi/180.;
|
|---|
| 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 |
|
|---|
| 177 | if (verboseLevel > 1) {
|
|---|
| 178 | G4cout << " energy bin " << je1 << " energy=" << elab[je1] << G4endl;
|
|---|
| 179 | G4cout << " angle bin " << kint << " angle=" << theta/degree << G4endl;
|
|---|
| 180 | }
|
|---|
| 181 |
|
|---|
| 182 |
|
|---|
| 183 | // Get the target particle
|
|---|
| 184 |
|
|---|
| 185 | G4DynamicParticle* targetParticle = targetNucleus.ReturnTargetParticle();
|
|---|
| 186 |
|
|---|
| 187 | G4double E1 = aParticle->GetTotalEnergy();
|
|---|
| 188 | G4double M1 = aParticle->GetDefinition()->GetPDGMass();
|
|---|
| 189 | G4double E2 = targetParticle->GetTotalEnergy();
|
|---|
| 190 | G4double M2 = targetParticle->GetDefinition()->GetPDGMass();
|
|---|
| 191 | G4double totalEnergy = E1 + E2;
|
|---|
| 192 | G4double pseudoMass = std::sqrt(totalEnergy*totalEnergy - P*P);
|
|---|
| 193 | // pseudoMass also = std::sqrt(M1*M1 + M2*M2 + 2*M2*E1)
|
|---|
| 194 |
|
|---|
| 195 | // Transform into centre of mass system
|
|---|
| 196 |
|
|---|
| 197 | G4double px = (M2/pseudoMass)*Px;
|
|---|
| 198 | G4double py = (M2/pseudoMass)*Py;
|
|---|
| 199 | G4double pz = (M2/pseudoMass)*Pz;
|
|---|
| 200 | G4double p = std::sqrt(px*px + py*py + pz*pz);
|
|---|
| 201 |
|
|---|
| 202 | if (verboseLevel > 1) {
|
|---|
| 203 | G4cout << " E1, M1 (GeV) " << E1/GeV << " " << M1/GeV << G4endl;
|
|---|
| 204 | G4cout << " E2, M2 (GeV) " << E2/GeV << " " << M2/GeV << G4endl;
|
|---|
| 205 | G4cout << " particle 1 momentum in CM " << px/GeV << " " << py/GeV << " "
|
|---|
| 206 | << pz/GeV << " " << p/GeV << G4endl;
|
|---|
| 207 | }
|
|---|
| 208 |
|
|---|
| 209 | // First scatter w.r.t. Z axis
|
|---|
| 210 | G4double phi = G4UniformRand()*twopi;
|
|---|
| 211 | G4double pxnew = p*std::sin(theta)*std::cos(phi);
|
|---|
| 212 | G4double pynew = p*std::sin(theta)*std::sin(phi);
|
|---|
| 213 | G4double pznew = p*std::cos(theta);
|
|---|
| 214 |
|
|---|
| 215 | // Rotate according to the direction of the incident particle
|
|---|
| 216 | if (px*px + py*py > 0) {
|
|---|
| 217 | G4double cost, sint, ph, cosp, sinp;
|
|---|
| 218 | cost = pz/p;
|
|---|
| 219 | sint = (std::sqrt(std::abs((1-cost)*(1+cost))) + std::sqrt(px*px+py*py)/p)/2;
|
|---|
| 220 | py < 0 ? ph = 3*halfpi : ph = halfpi;
|
|---|
| 221 | if (std::abs(px) > 0.000001*GeV) ph = std::atan2(py,px);
|
|---|
| 222 | cosp = std::cos(ph);
|
|---|
| 223 | sinp = std::sin(ph);
|
|---|
| 224 | px = (cost*cosp*pxnew - sinp*pynew + sint*cosp*pznew);
|
|---|
| 225 | py = (cost*sinp*pxnew + cosp*pynew + sint*sinp*pznew);
|
|---|
| 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);
|
|---|
| 231 | }
|
|---|
| 232 | else {
|
|---|
| 233 | px = pxnew;
|
|---|
| 234 | py = pynew;
|
|---|
| 235 | pz = pznew;
|
|---|
| 236 | }
|
|---|
| 237 |
|
|---|
| 238 | if (verboseLevel > 1) {
|
|---|
| 239 | G4cout << " AFTER SCATTER..." << G4endl;
|
|---|
| 240 | G4cout << " particle 1 momentum in CM " << px/GeV << " " << py/GeV << " "
|
|---|
| 241 | << pz/GeV << " " << p/GeV << G4endl;
|
|---|
| 242 | }
|
|---|
| 243 |
|
|---|
| 244 | // Transform to lab system
|
|---|
| 245 |
|
|---|
| 246 | G4double E1pM2 = E1 + M2;
|
|---|
| 247 | G4double betaCM = P/E1pM2;
|
|---|
| 248 | G4double betaCMx = Px/E1pM2;
|
|---|
| 249 | G4double betaCMy = Py/E1pM2;
|
|---|
| 250 | G4double betaCMz = Pz/E1pM2;
|
|---|
| 251 | G4double gammaCM = E1pM2/std::sqrt(E1pM2*E1pM2 - P*P);
|
|---|
| 252 |
|
|---|
| 253 | if (verboseLevel > 1) {
|
|---|
| 254 | G4cout << " betaCM " << betaCMx << " " << betaCMy << " "
|
|---|
| 255 | << betaCMz << " " << betaCM << G4endl;
|
|---|
| 256 | G4cout << " gammaCM " << gammaCM << G4endl;
|
|---|
| 257 | }
|
|---|
| 258 |
|
|---|
| 259 | // Now following GLOREN...
|
|---|
| 260 |
|
|---|
| 261 | G4double BETA[5], PA[5], PB[5];
|
|---|
| 262 | BETA[1] = -betaCMx;
|
|---|
| 263 | BETA[2] = -betaCMy;
|
|---|
| 264 | BETA[3] = -betaCMz;
|
|---|
| 265 | BETA[4] = gammaCM;
|
|---|
| 266 |
|
|---|
| 267 | //The incident particle...
|
|---|
| 268 |
|
|---|
| 269 | PA[1] = px;
|
|---|
| 270 | PA[2] = py;
|
|---|
| 271 | PA[3] = pz;
|
|---|
| 272 | PA[4] = std::sqrt(M1*M1 + p*p);
|
|---|
| 273 |
|
|---|
| 274 | G4double BETPA = BETA[1]*PA[1] + BETA[2]*PA[2] + BETA[3]*PA[3];
|
|---|
| 275 | G4double BPGAM = (BETPA * BETA[4]/(BETA[4] + 1.) - PA[4]) * BETA[4];
|
|---|
| 276 |
|
|---|
| 277 | PB[1] = PA[1] + BPGAM * BETA[1];
|
|---|
| 278 | PB[2] = PA[2] + BPGAM * BETA[2];
|
|---|
| 279 | PB[3] = PA[3] + BPGAM * BETA[3];
|
|---|
| 280 | PB[4] = (PA[4] - BETPA) * BETA[4];
|
|---|
| 281 |
|
|---|
| 282 | G4DynamicParticle* newP = new G4DynamicParticle;
|
|---|
| 283 | newP->SetDefinition(const_cast<G4ParticleDefinition *>(aParticle->GetDefinition()));
|
|---|
| 284 | newP->SetMomentum(G4ThreeVector(PB[1], PB[2], PB[3]));
|
|---|
| 285 |
|
|---|
| 286 | //The target particle...
|
|---|
| 287 |
|
|---|
| 288 | PA[1] = -px;
|
|---|
| 289 | PA[2] = -py;
|
|---|
| 290 | PA[3] = -pz;
|
|---|
| 291 | PA[4] = std::sqrt(M2*M2 + p*p);
|
|---|
| 292 |
|
|---|
| 293 | BETPA = BETA[1]*PA[1] + BETA[2]*PA[2] + BETA[3]*PA[3];
|
|---|
| 294 | BPGAM = (BETPA * BETA[4]/(BETA[4] + 1.) - PA[4]) * BETA[4];
|
|---|
| 295 |
|
|---|
| 296 | PB[1] = PA[1] + BPGAM * BETA[1];
|
|---|
| 297 | PB[2] = PA[2] + BPGAM * BETA[2];
|
|---|
| 298 | PB[3] = PA[3] + BPGAM * BETA[3];
|
|---|
| 299 | PB[4] = (PA[4] - BETPA) * BETA[4];
|
|---|
| 300 |
|
|---|
| 301 | targetParticle->SetMomentum(G4ThreeVector(PB[1], PB[2], PB[3]));
|
|---|
| 302 |
|
|---|
| 303 | if (verboseLevel > 1) {
|
|---|
| 304 | G4cout << " particle 1 momentum in LAB "
|
|---|
| 305 | << newP->GetMomentum()*(1./GeV)
|
|---|
| 306 | << " " << newP->GetTotalMomentum()/GeV << G4endl;
|
|---|
| 307 | G4cout << " particle 2 momentum in LAB "
|
|---|
| 308 | << targetParticle->GetMomentum()*(1./GeV)
|
|---|
| 309 | << " " << targetParticle->GetTotalMomentum()/GeV << G4endl;
|
|---|
| 310 | G4cout << " TOTAL momentum in LAB "
|
|---|
| 311 | << (newP->GetMomentum()+targetParticle->GetMomentum())*(1./GeV)
|
|---|
| 312 | << " "
|
|---|
| 313 | << (newP->GetMomentum()+targetParticle->GetMomentum()).mag()/GeV
|
|---|
| 314 | << G4endl;
|
|---|
| 315 | }
|
|---|
| 316 |
|
|---|
| 317 | theParticleChange.SetMomentumChange(newP->GetMomentumDirection());
|
|---|
| 318 | theParticleChange.SetEnergyChange(newP->GetKineticEnergy());
|
|---|
| 319 | delete newP;
|
|---|
| 320 | G4DynamicParticle* p1 = new G4DynamicParticle;
|
|---|
| 321 | p1->SetDefinition(targetParticle->GetDefinition());
|
|---|
| 322 | p1->SetMomentum(targetParticle->GetMomentum());
|
|---|
| 323 | theParticleChange.AddSecondary(p1);
|
|---|
| 324 |
|
|---|
| 325 | return &theParticleChange;
|
|---|
| 326 | }
|
|---|
| 327 |
|
|---|
| 328 | // end of file
|
|---|
