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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 "G4INCLNNbarElasticChannel.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 NNbarElasticChannel::NNbarElasticChannel(Particle *p1, Particle *p2)
50 : particle1(p1), particle2(p2)
51 {}
52
53 NNbarElasticChannel::~NNbarElasticChannel(){}
54
55 void NNbarElasticChannel::fillFinalState(FinalState *fs) {
56
57 //brief ppbar
58 // p pbar -> p pbar (BFMM 2)
59 //
60 //brief npbar
61 // n pbar -> n pbar (BFMM 472)
62 //
63 //brief nnbar
64 // n nbar -> n nbar (same as BFMM 2)
65 //
66 //brief pnbar
67 // p nbar -> p nbar (same as BFMM 472)
68 //
69 //
70
71
72
73 Particle *nucleon;
74 Particle *antinucleon;
75
76 if(particle1->isNucleon()){
77 nucleon = particle1;
78 antinucleon = particle2;
79 }
80 else{
81 nucleon = particle2;
82 antinucleon = particle1;
83 }
84
85 const G4double sqrtS = KinematicsUtils::totalEnergyInCM(nucleon, antinucleon);
86
87 G4double mn=nucleon->getMass();
88 G4double my=antinucleon->getMass();
89
90 G4double ey=(sqrtS*sqrtS+my*my-mn*mn)/(2*sqrtS);
91 G4double en=std::sqrt(ey*ey-my*my+mn*mn);
92 nucleon->setEnergy(en);
93 antinucleon->setEnergy(ey);
94 G4double py=std::sqrt(ey*ey-my*my);
95
96 ThreeVector mom_antinucleon = Random::normVector(py);
97
98 antinucleon->setMomentum(mom_antinucleon);
99 nucleon->setMomentum(-mom_antinucleon);
100
101 fs->addModifiedParticle(nucleon);
102 fs->addModifiedParticle(antinucleon);
103 }
104 }
105