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25 // 25 //
26 // INCL++ intra-nuclear cascade model 26 // INCL++ intra-nuclear cascade model
27 // Alain Boudard, CEA-Saclay, France 27 // Alain Boudard, CEA-Saclay, France
28 // Joseph Cugnon, University of Liege, Belgium 28 // Joseph Cugnon, University of Liege, Belgium
29 // Jean-Christophe David, CEA-Saclay, France 29 // Jean-Christophe David, CEA-Saclay, France
30 // Pekka Kaitaniemi, CEA-Saclay, France, and H 30 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
31 // Sylvie Leray, CEA-Saclay, France 31 // Sylvie Leray, CEA-Saclay, France
32 // Davide Mancusi, CEA-Saclay, France 32 // Davide Mancusi, CEA-Saclay, France
33 // 33 //
34 #define INCLXX_IN_GEANT4_MODE 1 34 #define INCLXX_IN_GEANT4_MODE 1
35 35
36 #include "globals.hh" 36 #include "globals.hh"
37 37
38 #include "G4INCLPiNElasticChannel.hh" 38 #include "G4INCLPiNElasticChannel.hh"
39 #include "G4INCLKinematicsUtils.hh" 39 #include "G4INCLKinematicsUtils.hh"
40 #include "G4INCLBinaryCollisionAvatar.hh" 40 #include "G4INCLBinaryCollisionAvatar.hh"
41 #include "G4INCLRandom.hh" 41 #include "G4INCLRandom.hh"
42 #include "G4INCLGlobals.hh" 42 #include "G4INCLGlobals.hh"
43 #include "G4INCLLogger.hh" 43 #include "G4INCLLogger.hh"
44 44
45 namespace G4INCL { 45 namespace G4INCL {
46 46
47 PiNElasticChannel::PiNElasticChannel(Parti 47 PiNElasticChannel::PiNElasticChannel(Particle *p1, Particle *p2)
48 : particle1(p1), particle2(p2) 48 : particle1(p1), particle2(p2)
49 { 49 {
50 50
51 } 51 }
52 52
53 PiNElasticChannel::~PiNElasticChannel(){ 53 PiNElasticChannel::~PiNElasticChannel(){
54 54
55 } 55 }
56 56
57 void PiNElasticChannel::fillFinalState(Fin 57 void PiNElasticChannel::fillFinalState(FinalState *fs) {
58 Particle * nucleon; 58 Particle * nucleon;
59 Particle * pion; 59 Particle * pion;
60 if(particle1->isNucleon()) { 60 if(particle1->isNucleon()) {
61 nucleon = particle1; 61 nucleon = particle1;
62 pion = particle2; 62 pion = particle2;
63 } else { 63 } else {
64 nucleon = particle2; 64 nucleon = particle2;
65 pion = particle1; 65 pion = particle1;
66 } 66 }
67 << 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 ThreeVector deltaMomentum = nucleon->getMomentum() + pion->getMomentum();
>> 91 nucleon->setMomentum(deltaMomentum);
>> 92
>> 93 const G4double deltaMass = std::sqrt(deltaEnergy*deltaEnergy - deltaMomentum.mag2());
>> 94 nucleon->setMass(deltaMass);
>> 95 nucleon->setHelicity(1.0);
>> 96
>> 97 fs->addModifiedParticle(nucleon); // nucleon became a delta
>> 98 fs->addDestroyedParticle(pion); // pion was removed
>> 99 fs->setDeltaFixed(true);
>> 100 */
68 G4double bpn=8e-6; // B-parameter of 101 G4double bpn=8e-6; // B-parameter of exp(Bt) - (MeV/c)^-2
69 G4double px_nucleon=nucleon->getMoment 102 G4double px_nucleon=nucleon->getMomentum().getX();
70 G4double py_nucleon=nucleon->getMoment 103 G4double py_nucleon=nucleon->getMomentum().getY();
71 G4double pz_nucleon=nucleon->getMoment 104 G4double pz_nucleon=nucleon->getMomentum().getZ();
72 G4double cnorm1=px_nucleon*px_nucleon+ 105 G4double cnorm1=px_nucleon*px_nucleon+py_nucleon*py_nucleon;
73 G4double cnorm2=std::sqrt(cnorm1); 106 G4double cnorm2=std::sqrt(cnorm1);
74 G4double tnorm=cnorm1+pz_nucleon*pz_nu 107 G4double tnorm=cnorm1+pz_nucleon*pz_nucleon;
75 G4double cnorm=std::sqrt(tnorm); 108 G4double cnorm=std::sqrt(tnorm);
76 G4double btm=std::exp(-4.*tnorm*bpn); 109 G4double btm=std::exp(-4.*tnorm*bpn);
77 G4double rndm=Random::shoot(); 110 G4double rndm=Random::shoot();
78 G4double yrn=1.-rndm*(1.-btm); 111 G4double yrn=1.-rndm*(1.-btm);
79 G4double tt=std::log(yrn)/bpn; 112 G4double tt=std::log(yrn)/bpn;
80 G4double ctheta=1.+0.5*tt/tnorm; 113 G4double ctheta=1.+0.5*tt/tnorm;
81 G4double stheta=std::sqrt(1.-ctheta*ct 114 G4double stheta=std::sqrt(1.-ctheta*ctheta);
82 G4double t7=1.-2.*Random::shoot(); 115 G4double t7=1.-2.*Random::shoot();
83 G4double t8=std::sqrt(1-t7*t7); 116 G4double t8=std::sqrt(1-t7*t7);
84 G4double t1=-py_nucleon/cnorm2; 117 G4double t1=-py_nucleon/cnorm2;
85 G4double t2=px_nucleon/cnorm2; 118 G4double t2=px_nucleon/cnorm2;
86 G4double t4=t2*pz_nucleon/cnorm; 119 G4double t4=t2*pz_nucleon/cnorm;
87 G4double t5=-t1*pz_nucleon/cnorm; 120 G4double t5=-t1*pz_nucleon/cnorm;
88 G4double t6=-cnorm2/cnorm; 121 G4double t6=-cnorm2/cnorm;
89 ThreeVector mom_nucleon( 122 ThreeVector mom_nucleon(
90 px_nucleon*cth 123 px_nucleon*ctheta+cnorm*stheta*(t1*t7+t4*t8),
91 py_nucleon*cth 124 py_nucleon*ctheta+cnorm*stheta*(t2*t7+t5*t8),
92 pz_nucleon*cth 125 pz_nucleon*ctheta+cnorm*stheta*t6*t8
93 ); 126 );
94 nucleon->setMomentum(mom_nucleon); 127 nucleon->setMomentum(mom_nucleon);
95 pion->setMomentum(-mom_nucleon); 128 pion->setMomentum(-mom_nucleon);
96 129
97 #ifdef INCLXX_IN_GEANT4_MODE <<
98 ParticleType startingNucleonType = nucleon <<
99 ParticleType startingPionType = pion->getT <<
100 #endif <<
101 <<
102 G4int iso=ParticleTable::getIsospin(nu 130 G4int iso=ParticleTable::getIsospin(nucleon->getType())+ParticleTable::getIsospin(pion->getType());
103 if (iso == 1 || iso == -1) { 131 if (iso == 1 || iso == -1) {
104 rndm=3*Random::shoot(); 132 rndm=3*Random::shoot();
105 if (rndm < 1.) { 133 if (rndm < 1.) {
106 ParticleType nucleonType=Parti 134 ParticleType nucleonType=ParticleTable::getNucleonType(-iso);
107 nucleon->setType(nucleonType); 135 nucleon->setType(nucleonType);
108 ParticleType pionType=Particle 136 ParticleType pionType=ParticleTable::getPionType(2*iso);
109 pion->setType(pionType); 137 pion->setType(pionType);
110 } 138 }
111 else { 139 else {
112 ParticleType nucleonType=Parti 140 ParticleType nucleonType=ParticleTable::getNucleonType(iso);
113 nucleon->setType(nucleonType); 141 nucleon->setType(nucleonType);
114 pion->setType(PiZero); 142 pion->setType(PiZero);
115 } 143 }
116 } 144 }
117 else { // Useless << 145 else {
118 ParticleType nucleonType=ParticleT 146 ParticleType nucleonType=ParticleTable::getNucleonType(iso/3);
119 nucleon->setType(nucleonType); 147 nucleon->setType(nucleonType);
120 ParticleType pionType=ParticleTabl 148 ParticleType pionType=ParticleTable::getPionType(2*iso/3);
121 pion->setType(pionType); 149 pion->setType(pionType);
122 } 150 }
123 <<
124 #ifdef INCLXX_IN_GEANT4_MODE <<
125 // Erase the parent resonance information <<
126 if ( startingNucleonType != nucleon->getTy <<
127 nucleon->setParentResonancePDGCode(0); <<
128 nucleon->setParentResonanceID(0); <<
129 pion->setParentResonancePDGCode(0); <<
130 pion->setParentResonanceID(0); <<
131 } <<
132 #endif <<
133 151
134 fs->addModifiedParticle(nucleon); 152 fs->addModifiedParticle(nucleon);
135 fs->addModifiedParticle(pion); 153 fs->addModifiedParticle(pion);
136 } 154 }
137 155
138 } 156 }
139 157