Geant4_10
G4INCLRecombinationChannel.cc
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25 //
26 // INCL++ intra-nuclear cascade model
27 // Pekka Kaitaniemi, CEA and Helsinki Institute of Physics
28 // Davide Mancusi, CEA
29 // Alain Boudard, CEA
30 // Sylvie Leray, CEA
31 // Joseph Cugnon, University of Liege
32 //
33 #define INCLXX_IN_GEANT4_MODE 1
34 
35 #include "globals.hh"
36 
45 #include "G4INCLRandom.hh"
46 #include "G4INCLKinematicsUtils.hh"
47 #include "G4INCLParticleTable.hh"
49 #include "G4INCLGlobals.hh"
50 
51 // #include <cassert>
52 
53 namespace G4INCL {
54 
56  {
57  if(p1->isDelta()) {
58 // assert(p2->isNucleon());
59  theDelta = p1;
60  theNucleon = p2;
61  } else {
62 // assert(p1->isNucleon());
63  theDelta = p2;
64  theNucleon = p1;
65  }
66  }
67 
69  {
70  }
71 
73  {
74  // Compute the total available energy in the CM
75  const G4double sqrts = KinematicsUtils::totalEnergyInCM(theDelta, theNucleon);
76 
77  // Assign the types of the final-state particles
78  switch(theDelta->getType()) {
79  case DeltaPlusPlus:
80 // assert(theNucleon->getType()!=Proton);
81  theDelta->setType(Proton);
82  theNucleon->setType(Proton);
83  break;
84  case DeltaPlus:
85  theDelta->setType(Proton);
86  break;
87  case DeltaZero:
88  theDelta->setType(Neutron);
89  break;
90  case DeltaMinus:
91 // assert(theNucleon->getType()!=Neutron);
92  theDelta->setType(Neutron);
93  theNucleon->setType(Neutron);
94  break;
95  default:
96  INCL_ERROR("Unknown particle type in RecombinationChannel" << std::endl);
97  break;
98  }
99 
100  // Calculate the momenta of the nucleons in the final state
101  const G4double pCM = KinematicsUtils::momentumInCM(sqrts, theDelta->getMass(), theNucleon->getMass());
102 
103  // The angular distribution of final-state nucleons is isotropic
104  ThreeVector momentum = Random::normVector(pCM);
105 
106  // Assign the momenta
107  theDelta->setMomentum(momentum);
108  theNucleon->setMomentum(-momentum);
109 
110  // Update the kinetic energies
111  theDelta->adjustEnergyFromMomentum();
112  theNucleon->adjustEnergyFromMomentum();
113 
114  // Create the final state
115  FinalState *fs = new FinalState();
116  fs->addModifiedParticle(theDelta);
117  fs->addModifiedParticle(theNucleon);
118 
119  return fs;
120 
121  }
122 
123 }
G4double getMass() const
Get the cached particle mass.
#define INCL_ERROR(x)
G4double adjustEnergyFromMomentum()
Recompute the energy to match the momentum.
G4bool isDelta() const
Is it a Delta?
G4double momentumInCM(Particle const *const p1, Particle const *const p2)
gives the momentum in the CM frame of two particles.
ThreeVector normVector(G4double norm=1.)
Delta-nucleon recombination channel.
G4INCL::ParticleType getType() const
void setType(ParticleType t)
RecombinationChannel(Particle *p1, Particle *p2)
double G4double
Definition: G4Types.hh:76
G4double totalEnergyInCM(Particle const *const p1, Particle const *const p2)
void addModifiedParticle(Particle *p)
virtual void setMomentum(const G4INCL::ThreeVector &momentum)