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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 "G4INCLSigmaZeroDecayChannel.hh" 38 #include "G4INCLSigmaZeroDecayChannel.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 43
44 namespace G4INCL { 44 namespace G4INCL {
45 45
46 SigmaZeroDecayChannel::SigmaZeroDecayChannel 46 SigmaZeroDecayChannel::SigmaZeroDecayChannel(Particle *p, ThreeVector const &dir)
47 :theParticle(p), incidentDirection(dir) 47 :theParticle(p), incidentDirection(dir)
48 {} 48 {}
49 49
50 SigmaZeroDecayChannel::~SigmaZeroDecayChanne 50 SigmaZeroDecayChannel::~SigmaZeroDecayChannel() {}
51 51
52 52
53 G4double SigmaZeroDecayChannel::computeDecay 53 G4double SigmaZeroDecayChannel::computeDecayTime(Particle *p) {
54 // assert(p->getType() == SigmaZero); 54 // assert(p->getType() == SigmaZero);
55 const G4double gamma = std::sqrt(1+std::po 55 const G4double gamma = std::sqrt(1+std::pow(p->getMomentum().mag()/p->getMass(),2));
56 const G4double tau = ParticleTable::getWid 56 const G4double tau = ParticleTable::getWidth(SigmaZero)*3E8*1E15*gamma; // fm
57 const G4double t = -tau * std::log(Random: 57 const G4double t = -tau * std::log(Random::shoot());
58 return t; 58 return t;
59 } 59 }
60 60
61 void SigmaZeroDecayChannel::sampleAngles(G4d 61 void SigmaZeroDecayChannel::sampleAngles(G4double *ctet_par, G4double *stet_par, G4double *phi_par) {
62 62
63 (*ctet_par) = -1.0 + 2.0*Random::shoot(); 63 (*ctet_par) = -1.0 + 2.0*Random::shoot();
64 if(std::abs(*ctet_par) > 1.0) (*ctet_par) 64 if(std::abs(*ctet_par) > 1.0) (*ctet_par) = Math::sign(*ctet_par); // needed?
65 (*stet_par) = std::sqrt(1.-(*ctet_par)*(*c 65 (*stet_par) = std::sqrt(1.-(*ctet_par)*(*ctet_par));
66 (*phi_par) = Math::twoPi * Random::shoot() 66 (*phi_par) = Math::twoPi * Random::shoot();
67 } 67 }
68 68
69 void SigmaZeroDecayChannel::fillFinalState(F 69 void SigmaZeroDecayChannel::fillFinalState(FinalState *fs) {
70 70
71 // assert( theParticle->getType() == SigmaZero 71 // assert( theParticle->getType() == SigmaZero);
72 ParticleType createdType = Photon; 72 ParticleType createdType = Photon;
73 73
74 const G4double sqrtS = theParticle->getMas 74 const G4double sqrtS = theParticle->getMass();
75 75
76 theParticle->setType(Lambda); 76 theParticle->setType(Lambda);
77 G4double phi, c_tet, s_tet; 77 G4double phi, c_tet, s_tet;
78 sampleAngles(&c_tet, &s_tet, &phi); 78 sampleAngles(&c_tet, &s_tet, &phi);
79 79
80 G4double c_phi = std::cos(phi); 80 G4double c_phi = std::cos(phi);
81 G4double s_phi = std::sin(phi); 81 G4double s_phi = std::sin(phi);
82 G4double beta = incidentDirection.mag(); 82 G4double beta = incidentDirection.mag();
83 83
84 G4double q1, q2, q3; 84 G4double q1, q2, q3;
85 G4double sal=0.0; 85 G4double sal=0.0;
86 if (beta >= 1.0e-10) 86 if (beta >= 1.0e-10)
87 sal = incidentDirection.perp()/beta; 87 sal = incidentDirection.perp()/beta;
88 if (sal >= 1.0e-6) { 88 if (sal >= 1.0e-6) {
89 G4double b1 = incidentDirection.getX(); 89 G4double b1 = incidentDirection.getX();
90 G4double b2 = incidentDirection.getY(); 90 G4double b2 = incidentDirection.getY();
91 G4double b3 = incidentDirection.getZ(); 91 G4double b3 = incidentDirection.getZ();
92 G4double cal = b3/beta; 92 G4double cal = b3/beta;
93 G4double t1 = c_tet+cal*s_tet*s_phi/sal; 93 G4double t1 = c_tet+cal*s_tet*s_phi/sal;
94 G4double t2 = s_tet/sal; 94 G4double t2 = s_tet/sal;
95 q1=(b1*t1+b2*t2*c_phi)/beta; 95 q1=(b1*t1+b2*t2*c_phi)/beta;
96 q2=(b2*t1-b1*t2*c_phi)/beta; 96 q2=(b2*t1-b1*t2*c_phi)/beta;
97 q3=(b3*t1/beta-t2*s_phi); 97 q3=(b3*t1/beta-t2*s_phi);
98 } else { 98 } else {
99 q1 = s_tet*c_phi; 99 q1 = s_tet*c_phi;
100 q2 = s_tet*s_phi; 100 q2 = s_tet*s_phi;
101 q3 = c_tet; 101 q3 = c_tet;
102 } 102 }
103 103
104 G4double xq = KinematicsUtils::momentumInC 104 G4double xq = KinematicsUtils::momentumInCM(sqrtS,
105 theParticle->getMass 105 theParticle->getMass(),
106 ParticleTable::getIN 106 ParticleTable::getINCLMass(createdType));
107 q1 *= xq; 107 q1 *= xq;
108 q2 *= xq; 108 q2 *= xq;
109 q3 *= xq; 109 q3 *= xq;
110 110
111 ThreeVector createdMomentum(q1, q2, q3); 111 ThreeVector createdMomentum(q1, q2, q3);
112 ThreeVector createdPosition(theParticle->g 112 ThreeVector createdPosition(theParticle->getPosition());
113 Particle *createdParticle = new Particle(c 113 Particle *createdParticle = new Particle(createdType, createdMomentum, createdPosition);
114 theParticle->setMomentum(-createdMomentum) 114 theParticle->setMomentum(-createdMomentum);
115 theParticle->adjustEnergyFromMomentum(); 115 theParticle->adjustEnergyFromMomentum();
116 116
117 fs->addModifiedParticle(theParticle); 117 fs->addModifiedParticle(theParticle);
118 fs->addCreatedParticle(createdParticle); 118 fs->addCreatedParticle(createdParticle);
119 119
120 } 120 }
121 } 121 }
122 122