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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 "G4INCLNKToNKChannel.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 NKToNKChannel::NKToNKChannel(Particle *p1, Particle *p2)
50 : particle1(p1), particle2(p2)
51 {}
52
53 NKToNKChannel::~NKToNKChannel(){}
54
55 void NKToNKChannel::fillFinalState(FinalState *fs) {
56
57 Particle *nucleon;
58 Particle *kaon;
59
60 if(particle1->isNucleon()){
61 nucleon = particle1;
62 kaon = particle2;
63 }
64 else{
65 nucleon = particle2;
66 kaon = particle1;
67 }
68
69 // assert(ParticleTable::getIsospin(nucleon->getType()) + ParticleTable::getIsospin(kaon->getType()) == 0);
70
71 if(kaon->getType() == KZero){
72 nucleon->setType(Neutron);
73 kaon->setType(KPlus);
74 }
75 else{
76 nucleon->setType(Proton);
77 kaon->setType(KZero);
78 }
79
80 ThreeVector mom_kaon;
81
82 // const G4double pLab = KinematicsUtils::momentumInLab(kaon,nucleon);
83
84 /* if(pLab==0) mom_kaon = Random::normVector();
85 else{
86 const G4double x = kaon->getMomentum().getX();
87 const G4double y = kaon->getMomentum().getY();
88 const G4double z = kaon->getMomentum().getZ();
89
90 const G4double r = std::sqrt(x*x+y*y+z*z);
91 const G4double rho = std::sqrt(x*x+y*y);
92
93 const G4double b = 12. * pLab/2375.; // correspond to the forward slope description at 2375 MeV/c in K- p elastic
94 const G4double cos_theta = std::log(Random::shoot()*(std::exp(b)-std::exp(-b))+std::exp(-b))/b;
95 const G4double sin_theta = std::sqrt(1-cos_theta*cos_theta);
96
97 const G4double cos_phi = std::cos(Random::shoot()*Math::twoPi);
98 const G4double sin_phi = std::sqrt(1-cos_phi*cos_phi);
99
100 if(rho == 0) mom_kaon = ThreeVector(sin_theta*cos_phi,sin_theta*sin_phi,cos_theta);
101 // Rotation in the direction of the incident kaon
102 const G4double px = x/r*cos_theta - y/rho*sin_theta*cos_phi + z/r*x/rho*sin_theta*sin_phi;
103 const G4double py = y/r*cos_theta + x/rho*sin_theta*cos_phi + z/r*y/rho*sin_theta*sin_phi;
104 const G4double pz = z/r*cos_theta - rho/r*sin_theta*sin_phi;
105
106 mom_kaon = ThreeVector(px,py,pz);
107 }*/
108
109 mom_kaon = Random::normVector();
110
111 G4double norm = KinematicsUtils::momentumInCM(kaon,nucleon);
112
113 kaon->setMomentum(mom_kaon*norm);
114 nucleon->setMomentum(-mom_kaon*norm);
115
116 kaon->adjustEnergyFromMomentum();
117 nucleon->adjustEnergyFromMomentum();
118
119 fs->addModifiedParticle(nucleon);
120 fs->addModifiedParticle(kaon);
121
122 }
123 }
124