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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 "G4INCLNKToNK2piChannel.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 NKToNK2piChannel::angularSlope = 4.; // What is the exact effect? Sould be check
50
51 NKToNK2piChannel::NKToNK2piChannel(Particle *p1, Particle *p2)
52 : particle1(p1), particle2(p2)
53 {}
54
55 NKToNK2piChannel::~NKToNK2piChannel(){}
56
57 void NKToNK2piChannel::fillFinalState(FinalState *fs) {
58
59 // p K+ -> p K+ pi+ pi- (1)
60 // p K+ -> p K+ pi0 pi0 (1/8)
61 // p K+ -> p K0 pi+ pi0 (1)
62 // p K+ -> n K+ pi+ pi0 (1/2)
63 // p K+ -> n K0 pi+ pi+ (1/4)
64 //
65 // p K0 -> p K0 pi+ pi- (1)
66 // p K0 -> p K0 pi0 pi0 (1/8)
67 // p K0 -> p K+ pi0 pi- (1)
68 // p K0 -> n K+ pi+ pi- (1/4)
69 // p K0 -> n K+ pi0 pi0 (1/4)
70 // p K0 -> n K0 pi+ pi0 (1/2)
71
72 Particle *nucleon;
73 Particle *kaon;
74
75 if(particle1->isNucleon()){
76 nucleon = particle1;
77 kaon = particle2;
78 }
79 else{
80 nucleon = particle2;
81 kaon = particle1;
82 }
83
84 const G4double sqrtS = KinematicsUtils::totalEnergyInCM(nucleon, kaon);
85
86 const G4int iso = ParticleTable::getIsospin(nucleon->getType()) + ParticleTable::getIsospin(kaon->getType());
87 const G4int iso_n = ParticleTable::getIsospin(nucleon->getType());
88 G4double rdm = Random::shoot();
89
90 ParticleType Pion1Type;
91 ParticleType Pion2Type;
92
93 if(iso == 2 || iso == -2){
94 if(rdm*23. < 8.){
95 Pion1Type = PiPlus;
96 Pion2Type = PiMinus;
97 }
98 else if(rdm*23. < 9.){
99 Pion1Type = PiZero;
100 Pion2Type = PiZero;
101 }
102 else if(rdm*23. < 17.){
103 Pion1Type = ParticleTable::getPionType(iso);
104 Pion2Type = PiZero;
105 kaon->setType(ParticleTable::getKaonType(-iso/2));
106 }
107 else if(rdm*23. < 21.){
108 Pion1Type = ParticleTable::getPionType(iso);
109 Pion2Type = PiZero;
110 nucleon->setType(ParticleTable::getNucleonType(-iso/2));
111 }
112 else{
113 Pion1Type = ParticleTable::getPionType(iso);
114 Pion2Type = ParticleTable::getPionType(iso);
115 kaon->setType(ParticleTable::getKaonType(-iso/2));
116 nucleon->setType(ParticleTable::getNucleonType(-iso/2));
117 }
118 }
119 else{
120 if(rdm*25. < 8.){
121 Pion1Type = PiPlus;
122 Pion2Type = PiMinus;
123 }
124 else if(rdm*25. < 9.){
125 Pion1Type = PiZero;
126 Pion2Type = PiZero;
127 }
128 else if(rdm*25. < 17.){
129 Pion1Type = ParticleTable::getPionType(-2*iso_n);
130 Pion2Type = PiZero;
131 kaon->setType(ParticleTable::getKaonType(iso_n));
132 }
133 else if(rdm*25. < 19.){
134 Pion1Type = PiPlus;
135 Pion2Type = PiMinus;
136 kaon->setType(ParticleTable::getKaonType(iso_n));
137 nucleon->setType(ParticleTable::getNucleonType(-iso_n));
138 }
139 else if(rdm*25. < 21.){
140 Pion1Type = PiZero;
141 Pion2Type = PiZero;
142 kaon->setType(ParticleTable::getKaonType(iso_n));
143 nucleon->setType(ParticleTable::getNucleonType(-iso_n));
144 }
145 else{
146 Pion1Type = ParticleTable::getPionType(2*iso_n);
147 Pion2Type = PiZero;
148 nucleon->setType(ParticleTable::getNucleonType(-iso_n));
149 }
150 }
151
152 ParticleList list;
153 list.push_back(nucleon);
154 list.push_back(kaon);
155 const ThreeVector &rcol1 = nucleon->getPosition();
156 const ThreeVector &rcol2 = kaon->getPosition();
157 const ThreeVector zero;
158 Particle *pion1 = new Particle(Pion1Type,zero,rcol1);
159 Particle *pion2 = new Particle(Pion2Type,zero,rcol2);
160 list.push_back(pion1);
161 list.push_back(pion2);
162
163 PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
164
165 fs->addModifiedParticle(nucleon);
166 fs->addModifiedParticle(kaon);
167 fs->addCreatedParticle(pion1);
168 fs->addCreatedParticle(pion2);
169
170 }
171 }
172