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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 "G4INCLPiNToDeltaChannel.hh"
39 #include "G4INCLKinematicsUtils.hh"
40 #include "G4INCLBinaryCollisionAvatar.hh"
41 #include "G4INCLRandom.hh"
42 #include "G4INCLGlobals.hh"
43 #include "G4INCLLogger.hh"
44
45 namespace G4INCL {
46
47 PiNToDeltaChannel::PiNToDeltaChannel(Particle *p1, Particle *p2)
48 : particle1(p1), particle2(p2)
49 {
50
51 }
52
53 PiNToDeltaChannel::~PiNToDeltaChannel(){
54
55 }
56
57 void PiNToDeltaChannel::fillFinalState(FinalState *fs) {
58 Particle * nucleon;
59 Particle * pion;
60 if(particle1->isNucleon()) {
61 nucleon = particle1;
62 pion = particle2;
63 } else {
64 nucleon = particle2;
65 pion = particle1;
66 }
67
68 ParticleType deltaType = DeltaZero;
69 if(ParticleConfig::isPair(particle1, particle2, Proton, PiPlus)) {
70 deltaType = DeltaPlusPlus;
71 } else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiPlus)) {
72 deltaType = DeltaPlus;
73 } else if(ParticleConfig::isPair(particle1, particle2, Proton, PiZero)) {
74 deltaType = DeltaPlus;
75 } else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiZero)) {
76 deltaType = DeltaZero;
77 } else if(ParticleConfig::isPair(particle1, particle2, Proton, PiMinus)) {
78 deltaType = DeltaZero;
79 } else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiMinus)) {
80 deltaType = DeltaMinus;
81 } else {
82 INCL_ERROR("Unknown particle pair in Pi-N collision." << '\n');
83 }
84
85 G4double deltaEnergy = nucleon->getEnergy()+ pion->getEnergy();
86
87 nucleon->setType(deltaType); // nucleon becomes the delta
88 nucleon->setEnergy(deltaEnergy); // set the energy of the delta
89
90 #ifdef INCLXX_IN_GEANT4_MODE
91 // Erase the parent resonance information of the nucleon and pion
92 nucleon->setParentResonancePDGCode(0);
93 nucleon->setParentResonanceID(0);
94 pion->setParentResonancePDGCode(0);
95 pion->setParentResonanceID(0);
96 #endif
97
98 ThreeVector deltaMomentum = nucleon->getMomentum() + pion->getMomentum();
99 nucleon->setMomentum(deltaMomentum);
100
101 const G4double deltaMass = std::sqrt(deltaEnergy*deltaEnergy - deltaMomentum.mag2());
102 nucleon->setMass(deltaMass);
103
104 fs->addModifiedParticle(nucleon); // nucleon became a delta
105 fs->addDestroyedParticle(pion); // pion was removed
106 }
107
108 }
109