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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 "G4INCLNNbarCEXChannel.hh"
39 #include "G4INCLKinematicsUtils.hh"
40 #include "G4INCLBinaryCollisionAvatar.hh"
41 #include "G4INCLRandom.hh"
42 #include "G4INCLGlobals.hh"
43 #include "G4INCLLogger.hh"
44 #include <algorithm>
45 #include "G4INCLPhaseSpaceGenerator.hh"
46
47 namespace G4INCL {
48
49 NNbarCEXChannel::NNbarCEXChannel(Particle *p1, Particle *p2)
50 : particle1(p1), particle2(p2)
51 {}
52
53 NNbarCEXChannel::~NNbarCEXChannel(){}
54
55 void NNbarCEXChannel::fillFinalState(FinalState *fs) {
56
57 //brief ppbar
58 // p pbar -> n nbar (BFMM 204)
59 //
60 //brief nnbar
61 // n nbar -> p pbar (same as BFMM 204, but no threshold)
62 //
63
64 Particle *nucleon;
65 Particle *antinucleon;
66
67 if(particle1->isNucleon()){
68 nucleon = particle1;
69 antinucleon = particle2;
70 }
71 else{
72 nucleon = particle2;
73 antinucleon = particle1;
74 }
75
76 const G4double sqrtS = KinematicsUtils::totalEnergyInCM(nucleon, antinucleon);
77
78 //setting types of new particles
79 if(nucleon->getType()==Proton){
80 if(antinucleon->getType()==antiProton){ //ppbar case
81 nucleon->setType(Neutron);
82 antinucleon->setType(antiNeutron);
83 }
84 else{ //pnbar case
85 //no CEX for pnbar
86 INCL_ERROR("We should not be in this channel " << '\n');
87 }
88 }
89 else{ // neutron
90 if(antinucleon->getType()==antiNeutron){ //nnbar case
91 nucleon->setType(Proton);
92 antinucleon->setType(antiProton);
93 }
94 else{ //npbar case
95 //no CEX for npbar
96 INCL_ERROR("We should not be in this channel " << '\n');
97 }
98 }
99
100 G4double mn=nucleon->getMass();
101 G4double my=antinucleon->getMass();
102
103 G4double ey=(sqrtS*sqrtS+my*my-mn*mn)/(2*sqrtS);
104 G4double en=std::sqrt(ey*ey-my*my+mn*mn);
105 nucleon->setEnergy(en);
106 antinucleon->setEnergy(ey);
107 G4double py=std::sqrt(ey*ey-my*my);
108
109
110 ThreeVector mom_antinucleon = Random::normVector(py);
111
112 antinucleon->setMomentum(mom_antinucleon);
113 nucleon->setMomentum(-mom_antinucleon);
114
115 fs->addModifiedParticle(nucleon);
116 fs->addModifiedParticle(antinucleon);
117
118 }
119 }
120