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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 /** \file G4INCLRecombinationChannel.cc
39 * \brief Delta-nucleon recombination channel.
40 *
41 * \date 25 March 2011
42 * \author Davide Mancusi
43 */
44
45 #include "G4INCLRecombinationChannel.hh"
46 #include "G4INCLRandom.hh"
47 #include "G4INCLKinematicsUtils.hh"
48 #include "G4INCLParticleTable.hh"
49 #include "G4INCLBinaryCollisionAvatar.hh"
50 #include "G4INCLGlobals.hh"
51
52 // #include <cassert>
53
54 namespace G4INCL {
55
56 RecombinationChannel::RecombinationChannel(Particle *p1, Particle *p2)
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
69 RecombinationChannel::~RecombinationChannel()
70 {
71 }
72
73 void RecombinationChannel::fillFinalState(FinalState *fs)
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 }
122