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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 "G4INCLEtaNToPiPiNChannel.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 const G4double EtaNToPiPiNChannel::angularSlope = 15.; // from piNToMultipions
50
51 EtaNToPiPiNChannel::EtaNToPiPiNChannel(Particle *p1, Particle *p2)
52 : ind2(0),
53 particle1(p1),
54 particle2(p2)
55 {}
56
57 EtaNToPiPiNChannel::~EtaNToPiPiNChannel(){
58
59 }
60
61 void EtaNToPiPiNChannel::fillFinalState(FinalState *fs) {
62
63 Particle * nucleon;
64 Particle * eta;
65 if(particle1->isNucleon()) {
66 nucleon = particle1;
67 eta = particle2;
68 } else {
69 nucleon = particle2;
70 eta = particle1;
71 }
72
73 const G4double sqrtS = KinematicsUtils::totalEnergyInCM(nucleon, eta);
74
75 ind2=ParticleTable::getIsospin(nucleon->getType());
76
77 eta->setType(PiZero);
78
79 ParticleType pionType;
80 G4double rs1=Random::shoot();
81 if (ind2 == 1) {
82 if (rs1*6. > 5.) pionType=PiZero;
83 else if (rs1*6. > 3.) {
84 pionType=PiPlus;
85 ind2=-ind2;
86 }
87 else {
88 pionType=PiPlus;
89 eta->setType(PiMinus);
90 }
91 }
92 else {
93 if (rs1*6. > 5.) pionType=PiZero;
94 else if (rs1*6. > 3.) {
95 pionType=PiMinus;
96 ind2=-ind2;
97 }
98 else {
99 pionType=PiPlus;
100 eta->setType(PiMinus);
101 }
102 }
103
104
105 const ParticleType tn=ParticleTable::getNucleonType(ind2);
106 nucleon->setType(tn);
107 ParticleList list;
108 list.push_back(nucleon);
109 list.push_back(eta);
110 const ThreeVector &rcolpion = eta->getPosition();
111 const ThreeVector zero;
112 Particle *newPion = new Particle(pionType,zero,rcolpion);
113 list.push_back(newPion);
114 fs->addModifiedParticle(nucleon);
115 fs->addModifiedParticle(eta);
116 fs->addCreatedParticle(newPion);
117
118 PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
119
120 }
121
122 }
123