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G4INCLPauliStandard.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file G4INCLPauliStandard.cc
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25 //
26 // INCL++ intra-nuclear cascade model
27 // Alain Boudard, CEA-Saclay, France
28 // Joseph Cugnon, University of Liege, Belgium
29 // Jean-Christophe David, CEA-Saclay, France
30 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
31 // Sylvie Leray, CEA-Saclay, France
32 // Davide Mancusi, CEA-Saclay, France
33 //
34 #define INCLXX_IN_GEANT4_MODE 1
35 
36 #include "globals.hh"
37 
38 #include "G4INCLPauliStandard.hh"
39 #include "G4INCLPauliBlocking.hh"
40 #include "G4INCLGlobals.hh"
41 #include "G4INCLRandom.hh"
42 
43 namespace G4INCL {
44 
45 
47  cellSize(std::pow(2.38*4.5*Math::pi,1./6.)*std::sqrt(PhysicalConstants::hc))
48  {
49  INCL_DEBUG("Initialising PauliStandard. cellSize=" << cellSize << '\n');
50  }
51 
53 
55  for(ParticleIter p=pL.begin(), e=pL.end(); p!=e; ++p) {
56  if( !(*p)->isNucleon() ) continue;
57  if(getBlockingProbability(*p, n) > Random::shoot()) return true;
58  }
59  return false;
60  }
61 
62  G4double PauliStandard::getBlockingProbability(Particle const * const particle, Nucleus const * const nucleus) const {
63  const G4double r0 = ParticleTable::getNuclearRadius(particle->getType(), nucleus->getA(), nucleus->getZ());
64  const G4double pFermi = nucleus->getPotential()->getFermiMomentum(particle);
65 
66  const G4double pbl = cellSize * std::sqrt(pFermi/r0);
67  const G4double rbl = pbl * r0/pFermi;
68  const G4double maxVolR = rbl;
69  const G4double maxVolP = pbl;
70  G4double vol = std::pow(4.*Math::pi/3.0, 2)
71  * std::pow(maxVolR*maxVolP/(Math::twoPi*PhysicalConstants::hc), 3);
72 
73  const G4double rdeq = nucleus->getUniverseRadius();
74  const G4double rs = particle->getPosition().mag();
75 
76  if(rs - maxVolR > rdeq) {
77  return 0.0;
78  }
79 
80  if(rs + maxVolR > rdeq) {
81  vol = vol * 0.5 * (rdeq - rs + maxVolR) / maxVolR;
82  }
83 
84  // Get the list of particles that are currently inside the
85  // nucleus.
86  ParticleList const &particles = nucleus->getStore()->getParticles();
87 
88  G4int nl = 0;
89  for(ParticleIter it=particles.begin(), e=particles.end(); it!=e; ++it) {
90  // Skip comparing with the same particle
91  if( (*it)->getID() == particle->getID() ) continue;
92 
93  if((*it)->getType() == particle->getType()) {
94  const ThreeVector dx2v = particle->getPosition() - (*it)->getPosition();
95  const G4double dx2 = dx2v.mag2();
96  if(dx2 > maxVolR * maxVolR) continue;
97 
98  const ThreeVector dp2v = particle->getMomentum() - (*it)->getMomentum();
99  const G4double dp2 = dp2v.mag2();
100  if(dp2 > maxVolP * maxVolP) continue;
101 
102  nl++;
103  }
104  }
105  const G4double blockingProbability = ((G4double) nl) / vol / 2.0;
106 
107  if(blockingProbability > 1.0) return 1.0;
108  else if(blockingProbability < 0.0) return 0.0;
109  else return blockingProbability;
110  }
111 }