#include <G4HEPionPlusInelastic.hh>
Inheritance diagram for G4HEPionPlusInelastic:
Public Member Functions | |
G4HEPionPlusInelastic () | |
~G4HEPionPlusInelastic () | |
virtual void | ModelDescription (std::ostream &) const |
G4HadFinalState * | ApplyYourself (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus) |
G4int | GetNumberOfSecondaries () |
void | FirstIntInCasPionPlus (G4bool &inElastic, const G4double availableEnergy, G4HEVector pv[], G4int &vecLen, const G4HEVector &incidentParticle, const G4HEVector &targetParticle, const G4double atomicWeight) |
Data Fields | |
G4int | vecLength |
Definition at line 52 of file G4HEPionPlusInelastic.hh.
G4HEPionPlusInelastic::G4HEPionPlusInelastic | ( | ) | [inline] |
Definition at line 55 of file G4HEPionPlusInelastic.hh.
References G4cout, G4endl, G4HEInelastic::MAXPART, G4HadronicInteraction::theMaxEnergy, G4HadronicInteraction::theMinEnergy, vecLength, and G4HEInelastic::verboseLevel.
00055 : G4HEInelastic("G4HEPionPlusInelastic") 00056 { 00057 vecLength = 0; 00058 theMinEnergy = 45*CLHEP::GeV; 00059 theMaxEnergy = 10*CLHEP::TeV; 00060 MAXPART = 2048; 00061 verboseLevel = 0; 00062 G4cout << "WARNING: model G4HEPionPlusInelastic is being deprecated and will\n" 00063 << "disappear in Geant4 version 10.0" << G4endl; 00064 }
G4HEPionPlusInelastic::~G4HEPionPlusInelastic | ( | ) | [inline] |
G4HadFinalState * G4HEPionPlusInelastic::ApplyYourself | ( | const G4HadProjectile & | aTrack, | |
G4Nucleus & | targetNucleus | |||
) | [virtual] |
Implements G4HadronicInteraction.
Definition at line 57 of file G4HEPionPlusInelastic.cc.
References G4HEInelastic::ElasticScattering(), G4HEInelastic::FillParticleChange(), FirstIntInCasPionPlus(), G4cout, G4endl, G4UniformRand, G4Nucleus::GetA_asInt(), G4HEVector::getCode(), G4HEVector::getEnergy(), G4HEVector::getMass(), G4HEVector::getName(), G4Nucleus::GetZ_asInt(), G4HEInelastic::HighEnergyCascading(), G4HEInelastic::HighEnergyClusterProduction(), G4HEInelastic::MAXPART, G4HEInelastic::MediumEnergyCascading(), G4HEInelastic::MediumEnergyClusterProduction(), G4HEInelastic::NuclearExcitation(), G4HEInelastic::NuclearInelasticity(), G4HEInelastic::QuasiElasticScattering(), G4HEVector::setDefinition(), G4HadFinalState::SetStatusChange(), stopAndKill, G4HEInelastic::StrangeParticlePairProduction(), G4HadronicInteraction::theParticleChange, vecLength, and G4HEInelastic::verboseLevel.
00059 { 00060 G4HEVector* pv = new G4HEVector[MAXPART]; 00061 const G4HadProjectile* aParticle = &aTrack; 00062 const G4double A = targetNucleus.GetA_asInt(); 00063 const G4double Z = targetNucleus.GetZ_asInt(); 00064 G4HEVector incidentParticle(aParticle); 00065 00066 G4double atomicNumber = Z; 00067 G4double atomicWeight = A; 00068 00069 G4int incidentCode = incidentParticle.getCode(); 00070 G4double incidentMass = incidentParticle.getMass(); 00071 G4double incidentTotalEnergy = incidentParticle.getEnergy(); 00072 00073 // G4double incidentTotalMomentum = incidentParticle.getTotalMomentum(); 00074 // DHW 19 May 2011: variable set but not used 00075 00076 G4double incidentKineticEnergy = incidentTotalEnergy - incidentMass; 00077 00078 if (incidentKineticEnergy < 1.) 00079 G4cout << "G4HEPionPlusInelastic: incident energy < 1 GeV" << G4endl; 00080 00081 if (verboseLevel > 1) { 00082 G4cout << "G4HEPionPlusInelastic::ApplyYourself" << G4endl; 00083 G4cout << "incident particle " << incidentParticle.getName() 00084 << "mass " << incidentMass 00085 << "kinetic energy " << incidentKineticEnergy 00086 << G4endl; 00087 G4cout << "target material with (A,Z) = (" 00088 << atomicWeight << "," << atomicNumber << ")" << G4endl; 00089 } 00090 00091 G4double inelasticity = NuclearInelasticity(incidentKineticEnergy, 00092 atomicWeight, atomicNumber); 00093 if (verboseLevel > 1) 00094 G4cout << "nuclear inelasticity = " << inelasticity << G4endl; 00095 00096 incidentKineticEnergy -= inelasticity; 00097 00098 G4double excitationEnergyGNP = 0.; 00099 G4double excitationEnergyDTA = 0.; 00100 00101 G4double excitation = NuclearExcitation(incidentKineticEnergy, 00102 atomicWeight, atomicNumber, 00103 excitationEnergyGNP, 00104 excitationEnergyDTA); 00105 if (verboseLevel > 1) 00106 G4cout << "nuclear excitation = " << excitation << excitationEnergyGNP 00107 << excitationEnergyDTA << G4endl; 00108 00109 incidentKineticEnergy -= excitation; 00110 incidentTotalEnergy = incidentKineticEnergy + incidentMass; 00111 // incidentTotalMomentum = std::sqrt( (incidentTotalEnergy-incidentMass) 00112 // *(incidentTotalEnergy+incidentMass)); 00113 // DHW 19 May 2011: variable set but not used 00114 00115 G4HEVector targetParticle; 00116 if (G4UniformRand() < atomicNumber/atomicWeight) { 00117 targetParticle.setDefinition("Proton"); 00118 } else { 00119 targetParticle.setDefinition("Neutron"); 00120 } 00121 00122 G4double targetMass = targetParticle.getMass(); 00123 G4double centerOfMassEnergy = std::sqrt(incidentMass*incidentMass 00124 + targetMass*targetMass 00125 + 2.0*targetMass*incidentTotalEnergy); 00126 G4double availableEnergy = centerOfMassEnergy - targetMass - incidentMass; 00127 00128 G4bool inElastic = true; 00129 00130 vecLength = 0; 00131 00132 if (verboseLevel > 1) 00133 G4cout << "ApplyYourself: CallFirstIntInCascade for particle " 00134 << incidentCode << G4endl; 00135 00136 G4bool successful = false; 00137 00138 FirstIntInCasPionPlus(inElastic, availableEnergy, pv, vecLength, 00139 incidentParticle, targetParticle, atomicWeight); 00140 00141 if (verboseLevel > 1) 00142 G4cout << "ApplyYourself::StrangeParticlePairProduction" << G4endl; 00143 00144 if ((vecLength > 0) && (availableEnergy > 1.)) 00145 StrangeParticlePairProduction(availableEnergy, centerOfMassEnergy, 00146 pv, vecLength, 00147 incidentParticle, targetParticle); 00148 00149 HighEnergyCascading(successful, pv, vecLength, 00150 excitationEnergyGNP, excitationEnergyDTA, 00151 incidentParticle, targetParticle, 00152 atomicWeight, atomicNumber); 00153 if (!successful) 00154 HighEnergyClusterProduction(successful, pv, vecLength, 00155 excitationEnergyGNP, excitationEnergyDTA, 00156 incidentParticle, targetParticle, 00157 atomicWeight, atomicNumber); 00158 if (!successful) 00159 MediumEnergyCascading(successful, pv, vecLength, 00160 excitationEnergyGNP, excitationEnergyDTA, 00161 incidentParticle, targetParticle, 00162 atomicWeight, atomicNumber); 00163 00164 if (!successful) 00165 MediumEnergyClusterProduction(successful, pv, vecLength, 00166 excitationEnergyGNP, excitationEnergyDTA, 00167 incidentParticle, targetParticle, 00168 atomicWeight, atomicNumber); 00169 if (!successful) 00170 QuasiElasticScattering(successful, pv, vecLength, 00171 excitationEnergyGNP, excitationEnergyDTA, 00172 incidentParticle, targetParticle, 00173 atomicWeight, atomicNumber); 00174 if (!successful) 00175 ElasticScattering(successful, pv, vecLength, 00176 incidentParticle, 00177 atomicWeight, atomicNumber); 00178 00179 if (!successful) 00180 G4cout << "GHEInelasticInteraction::ApplyYourself fails to produce final state particles" 00181 << G4endl; 00182 00183 FillParticleChange(pv, vecLength); 00184 delete [] pv; 00185 theParticleChange.SetStatusChange(stopAndKill); 00186 return &theParticleChange; 00187 }
void G4HEPionPlusInelastic::FirstIntInCasPionPlus | ( | G4bool & | inElastic, | |
const G4double | availableEnergy, | |||
G4HEVector | pv[], | |||
G4int & | vecLen, | |||
const G4HEVector & | incidentParticle, | |||
const G4HEVector & | targetParticle, | |||
const G4double | atomicWeight | |||
) |
Definition at line 191 of file G4HEPionPlusInelastic.cc.
References G4HEInelastic::Amax(), G4HEInelastic::Amin(), G4cout, G4endl, G4UniformRand, G4HEVector::getCode(), G4HEVector::getMass(), G4HEVector::getName(), G4HEVector::getTotalMomentum(), G4HEInelastic::Imax(), CLHEP::detail::n, G4HEInelastic::Neutron, neutronCode, G4INCL::Math::pi, G4HEInelastic::PionMinus, G4HEInelastic::PionPlus, G4HEInelastic::PionZero, G4HEInelastic::pmltpc(), G4HEInelastic::Proton, sqr(), and G4HEInelastic::verboseLevel.
Referenced by ApplyYourself().
00206 { 00207 static const G4double expxu = 82.; // upper bound for arg. of exp 00208 static const G4double expxl = -expxu; // lower bound for arg. of exp 00209 00210 static const G4double protb = 0.7; 00211 static const G4double neutb = 0.7; 00212 static const G4double c = 1.25; 00213 00214 static const G4int numMul = 1200; 00215 static const G4int numSec = 60; 00216 00217 G4int neutronCode = Neutron.getCode(); 00218 G4int protonCode = Proton.getCode(); 00219 G4double pionMass = PionPlus.getMass(); 00220 00221 G4int targetCode = targetParticle.getCode(); 00222 G4double incidentTotalMomentum = incidentParticle.getTotalMomentum(); 00223 00224 static G4bool first = true; 00225 static G4double protmul[numMul], protnorm[numSec]; // proton constants 00226 static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants 00227 00228 // misc. local variables 00229 // npos = number of pi+, nneg = number of pi-, nzero = number of pi0 00230 00231 G4int i, counter, nt, npos, nneg, nzero; 00232 00233 if( first ) 00234 { // compute normalization constants, this will only be done once 00235 first = false; 00236 for( i=0; i<numMul; i++ )protmul[i] = 0.0; 00237 for( i=0; i<numSec; i++ )protnorm[i] = 0.0; 00238 counter = -1; 00239 for( npos=0; npos<(numSec/3); npos++ ) 00240 { 00241 for( nneg=Imax(0,npos-2); nneg<=npos; nneg++ ) 00242 { 00243 for( nzero=0; nzero<numSec/3; nzero++ ) 00244 { 00245 if( ++counter < numMul ) 00246 { 00247 nt = npos+nneg+nzero; 00248 if( (nt>0) && (nt<=numSec) ) 00249 { 00250 protmul[counter] = 00251 pmltpc(npos,nneg,nzero,nt,protb,c) ; 00252 protnorm[nt-1] += protmul[counter]; 00253 } 00254 } 00255 } 00256 } 00257 } 00258 for( i=0; i<numMul; i++ )neutmul[i] = 0.0; 00259 for( i=0; i<numSec; i++ )neutnorm[i] = 0.0; 00260 counter = -1; 00261 for( npos=0; npos<numSec/3; npos++ ) 00262 { 00263 for( nneg=Imax(0,npos-1); nneg<=(npos+1); nneg++ ) 00264 { 00265 for( nzero=0; nzero<numSec/3; nzero++ ) 00266 { 00267 if( ++counter < numMul ) 00268 { 00269 nt = npos+nneg+nzero; 00270 if( (nt>0) && (nt<=numSec) ) 00271 { 00272 neutmul[counter] = 00273 pmltpc(npos,nneg,nzero,nt,neutb,c); 00274 neutnorm[nt-1] += neutmul[counter]; 00275 } 00276 } 00277 } 00278 } 00279 } 00280 for( i=0; i<numSec; i++ ) 00281 { 00282 if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i]; 00283 if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i]; 00284 } 00285 } // end of initialization 00286 00287 00288 // initialize the first two places 00289 // the same as beam and target 00290 pv[0] = incidentParticle; 00291 pv[1] = targetParticle; 00292 vecLen = 2; 00293 00294 if( !inElastic ) 00295 { // quasi-elastic scattering, no pions produced 00296 if( targetCode == neutronCode ) 00297 { 00298 G4double cech[] = {0.33,0.27,0.29,0.31,0.27,0.18,0.13,0.10,0.09,0.07}; 00299 G4int iplab = G4int( Amin( 9.0, incidentTotalMomentum*5. ) ); 00300 if( G4UniformRand() < cech[iplab]/std::pow(atomicWeight,0.42) ) 00301 { // charge exchange pi+ n -> pi0 p 00302 pv[0] = PionZero; 00303 pv[1] = Proton; 00304 } 00305 } 00306 return; 00307 } 00308 else if (availableEnergy <= pionMass) 00309 return; 00310 00311 // inelastic scattering 00312 00313 npos = 0, nneg = 0, nzero = 0; 00314 G4double eab = availableEnergy; 00315 G4int ieab = G4int( eab*5.0 ); 00316 00317 G4double supp[] = {0., 0.2, 0.45, 0.55, 0.65, 0.75, 0.85, 0.90, 0.94, 0.98}; 00318 if( (ieab <= 9) && (G4UniformRand() >= supp[ieab]) ) 00319 { 00320 // suppress high multiplicity events at low momentum 00321 // only one additional pion will be produced 00322 G4double w0, wp, wm, wt, ran; 00323 if( targetCode == protonCode ) // target is a proton 00324 { 00325 w0 = - sqr(1.+protb)/(2.*c*c); 00326 wp = w0 = std::exp(w0); 00327 if( G4UniformRand() < w0/(w0+wp) ) 00328 { npos = 0; nneg = 0; nzero = 1; } 00329 else 00330 { npos = 1; nneg = 0; nzero = 0; } 00331 } 00332 else 00333 { // target is a neutron 00334 w0 = -sqr(1.+neutb)/(2.*c*c); 00335 wp = w0 = std::exp(w0); 00336 wm = -sqr(-1.+neutb)/(2.*c*c); 00337 wm = std::exp(wm); 00338 wt = w0+wp+wm; 00339 wp = w0+wp; 00340 ran = G4UniformRand(); 00341 if( ran < w0/wt) 00342 { npos = 0; nneg = 0; nzero = 1; } 00343 else if( ran < wp/wt) 00344 { npos = 1; nneg = 0; nzero = 0; } 00345 else 00346 { npos = 0; nneg = 1; nzero = 0; } 00347 } 00348 } 00349 else 00350 { 00351 // number of total particles vs. centre of mass Energy - 2*proton mass 00352 00353 G4double aleab = std::log(availableEnergy); 00354 G4double n = 3.62567+aleab*(0.665843+aleab*(0.336514 00355 + aleab*(0.117712+0.0136912*aleab))) - 2.0; 00356 00357 // normalization constant for kno-distribution. 00358 // calculate first the sum of all constants, check for numerical problems. 00359 G4double test, dum, anpn = 0.0; 00360 00361 for (nt=1; nt<=numSec; nt++) { 00362 test = std::exp( Amin( expxu, Amax( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); 00363 dum = pi*nt/(2.0*n*n); 00364 if (std::fabs(dum) < 1.0) { 00365 if( test >= 1.0e-10 )anpn += dum*test; 00366 } else { 00367 anpn += dum*test; 00368 } 00369 } 00370 00371 G4double ran = G4UniformRand(); 00372 G4double excs = 0.0; 00373 if( targetCode == protonCode ) 00374 { 00375 counter = -1; 00376 for (npos=0; npos<numSec/3; npos++) { 00377 for (nneg=Imax(0,npos-2); nneg<=npos; nneg++) { 00378 for (nzero=0; nzero<numSec/3; nzero++) { 00379 if (++counter < numMul) { 00380 nt = npos+nneg+nzero; 00381 if ( (nt>0) && (nt<=numSec) ) { 00382 test = std::exp( Amin( expxu, Amax( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); 00383 dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n); 00384 if (std::fabs(dum) < 1.0) { 00385 if( test >= 1.0e-10 )excs += dum*test; 00386 } else { 00387 excs += dum*test; 00388 } 00389 if (ran < excs) goto outOfLoop; //------------------> 00390 } 00391 } 00392 } 00393 } 00394 } 00395 00396 // 3 previous loops continued to the end 00397 inElastic = false; // quasi-elastic scattering 00398 return; 00399 } 00400 else 00401 { // target must be a neutron 00402 counter = -1; 00403 for (npos=0; npos<numSec/3; npos++) { 00404 for (nneg=Imax(0,npos-1); nneg<=(npos+1); nneg++) { 00405 for (nzero=0; nzero<numSec/3; nzero++) { 00406 if (++counter < numMul) { 00407 nt = npos+nneg+nzero; 00408 if ( (nt>=1) && (nt<=numSec) ) { 00409 test = std::exp( Amin( expxu, Amax( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); 00410 dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n); 00411 if (std::fabs(dum) < 1.0) { 00412 if( test >= 1.0e-10 )excs += dum*test; 00413 } else { 00414 excs += dum*test; 00415 } 00416 if (ran < excs) goto outOfLoop; // ---------------------> 00417 } 00418 } 00419 } 00420 } 00421 } 00422 // 3 previous loops continued to the end 00423 inElastic = false; // quasi-elastic scattering. 00424 return; 00425 } 00426 } 00427 outOfLoop: // <-------------------------------------------- 00428 00429 if( targetCode == protonCode) 00430 { 00431 if( npos == nneg) 00432 { 00433 } 00434 else if (npos == (1+nneg)) 00435 { 00436 if( G4UniformRand() < 0.5) 00437 { 00438 pv[1] = Neutron; 00439 } 00440 else 00441 { 00442 pv[0] = PionZero; 00443 } 00444 } 00445 else 00446 { 00447 pv[0] = PionZero; 00448 pv[1] = Neutron; 00449 } 00450 } 00451 else 00452 { 00453 if( npos == nneg) 00454 { 00455 if( G4UniformRand() < 0.25) 00456 { 00457 pv[0] = PionZero; 00458 pv[1] = Proton; 00459 } 00460 else 00461 { 00462 } 00463 } 00464 else if ( npos == (1+nneg)) 00465 { 00466 pv[0] = PionZero; 00467 } 00468 else 00469 { 00470 pv[1] = Proton; 00471 } 00472 } 00473 00474 00475 nt = npos + nneg + nzero; 00476 while ( nt > 0) 00477 { 00478 G4double ran = G4UniformRand(); 00479 if ( ran < (G4double)npos/nt) 00480 { 00481 if( npos > 0 ) 00482 { pv[vecLen++] = PionPlus; 00483 npos--; 00484 } 00485 } 00486 else if ( ran < (G4double)(npos+nneg)/nt) 00487 { 00488 if( nneg > 0 ) 00489 { 00490 pv[vecLen++] = PionMinus; 00491 nneg--; 00492 } 00493 } 00494 else 00495 { 00496 if( nzero > 0 ) 00497 { 00498 pv[vecLen++] = PionZero; 00499 nzero--; 00500 } 00501 } 00502 nt = npos + nneg + nzero; 00503 } 00504 if (verboseLevel > 1) 00505 { 00506 G4cout << "Particles produced: " ; 00507 G4cout << pv[0].getName() << " " ; 00508 G4cout << pv[1].getName() << " " ; 00509 for (i=2; i < vecLen; i++) 00510 { 00511 G4cout << pv[i].getName() << " " ; 00512 } 00513 G4cout << G4endl; 00514 } 00515 return; 00516 }
G4int G4HEPionPlusInelastic::GetNumberOfSecondaries | ( | ) | [inline] |
Definition at line 75 of file G4HEPionPlusInelastic.hh.
References vecLength.
00075 {return vecLength;}
void G4HEPionPlusInelastic::ModelDescription | ( | std::ostream & | ) | const [virtual] |
Reimplemented from G4HadronicInteraction.
Definition at line 42 of file G4HEPionPlusInelastic.cc.
00043 { 00044 outFile << "G4HEPionPlusInelastic is one of the High Energy\n" 00045 << "Parameterized (HEP) models used to implement inelastic\n" 00046 << "pi+ scattering from nuclei. It is a re-engineered\n" 00047 << "version of the GHEISHA code of H. Fesefeldt. It divides the\n" 00048 << "initial collision products into backward- and forward-going\n" 00049 << "clusters which are then decayed into final state hadrons.\n" 00050 << "The model does not conserve energy on an event-by-event\n" 00051 << "basis. It may be applied to pi+ with initial energies\n" 00052 << "above 20 GeV.\n"; 00053 }
Definition at line 70 of file G4HEPionPlusInelastic.hh.
Referenced by ApplyYourself(), G4HEPionPlusInelastic(), and GetNumberOfSecondaries().