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G4INCLNKToNKChannel.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file G4INCLNKToNKChannel.cc
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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"
41 #include "G4INCLRandom.hh"
42 #include "G4INCLGlobals.hh"
43 #include "G4INCLLogger.hh"
44 #include <algorithm>
46 
47 namespace G4INCL {
48 
50  : particle1(p1), particle2(p2)
51  {}
52 
54 
56 
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 
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 }