Geant4  10.03.p03
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G4INCLRecombinationChannel.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 
46 #include "G4INCLRandom.hh"
47 #include "G4INCLKinematicsUtils.hh"
48 #include "G4INCLParticleTable.hh"
50 #include "G4INCLGlobals.hh"
51 
52 // #include <cassert>
53 
54 namespace G4INCL {
55 
57  {
58  if(p1->isDelta()) {
59 // assert(p2->isNucleon());
60  theDelta = p1;
61  theNucleon = p2;
62  } else {
63 // assert(p1->isNucleon());
64  theDelta = p2;
65  theNucleon = p1;
66  }
67  }
68 
70  {
71  }
72 
74  {
75  // Compute the total available energy in the CM
76  const G4double sqrts = KinematicsUtils::totalEnergyInCM(theDelta, theNucleon);
77 
78  // Assign the types of the final-state particles
79  switch(theDelta->getType()) {
80  case DeltaPlusPlus:
81 // assert(theNucleon->getType()!=Proton);
82  theDelta->setType(Proton);
83  theNucleon->setType(Proton);
84  break;
85  case DeltaPlus:
86  theDelta->setType(Proton);
87  break;
88  case DeltaZero:
89  theDelta->setType(Neutron);
90  break;
91  case DeltaMinus:
92 // assert(theNucleon->getType()!=Neutron);
93  theDelta->setType(Neutron);
94  theNucleon->setType(Neutron);
95  break;
96  default:
97  INCL_ERROR("Unknown particle type in RecombinationChannel" << '\n');
98  break;
99  }
100 
101  // Calculate the momenta of the nucleons in the final state
102  const G4double pCM = KinematicsUtils::momentumInCM(sqrts, theDelta->getMass(), theNucleon->getMass());
103 
104  // The angular distribution of final-state nucleons is isotropic
105  ThreeVector momentum = Random::normVector(pCM);
106 
107  // Assign the momenta
108  theDelta->setMomentum(momentum);
109  theNucleon->setMomentum(-momentum);
110 
111  // Update the kinetic energies
112  theDelta->adjustEnergyFromMomentum();
113  theNucleon->adjustEnergyFromMomentum();
114 
115  // Create the final state
116  fs->addModifiedParticle(theDelta);
117  fs->addModifiedParticle(theNucleon);
118 
119  }
120 
121 }
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)