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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 "G4INCLOmegaNToPiNChannel.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 OmegaNToPiNChannel::OmegaNToPiNChannel(Particle *p1, Particle *p2)
48 : particle1(p1), particle2(p2)
49 {
50
51 }
52
53 OmegaNToPiNChannel::~OmegaNToPiNChannel(){
54
55 }
56
57 void OmegaNToPiNChannel::fillFinalState(FinalState *fs) {
58 Particle * nucleon;
59 Particle * omega;
60 if(particle1->isNucleon()) {
61 nucleon = particle1;
62 omega = particle2;
63 } else {
64 nucleon = particle2;
65 omega = particle1;
66 }
67
68 const G4double r2 = Random::shoot();
69 if (nucleon->getType() == Neutron) {
70 if (r2*3. < 2.) {
71 nucleon->setType(Proton);
72 omega->setType(PiMinus);
73 }
74 else {
75 nucleon->setType(Neutron);
76 omega->setType(PiZero);
77 }
78 }
79 else {
80 if (r2*3. < 2.) {
81 nucleon->setType(Neutron);
82 omega->setType(PiPlus);
83 }
84 else {
85 nucleon->setType(Proton);
86 omega->setType(PiZero);
87 }
88 }
89
90 G4double sh=nucleon->getEnergy()+omega->getEnergy();
91 G4double mn=nucleon->getMass();
92 G4double me=omega->getMass();
93 G4double en=(sh*sh+mn*mn-me*me)/(2*sh);
94 nucleon->setEnergy(en);
95 G4double ee=std::sqrt(en*en-mn*mn+me*me);
96 omega->setEnergy(ee);
97 G4double pn=std::sqrt(en*en-mn*mn);
98 /*// test isotropy
99 const G4double pi=std::acos(-1.0);
100 G4double x1;
101 G4double u1;
102 G4double fteta;
103 G4double teta;
104 G4double fi;
105
106 G4int passe1=0;
107 while (passe1==0) {
108 // Sample x from 0 to pi/2
109 x1=(pi/2.)*Random::shoot();
110 // Sample u from 0 to 1
111 u1=Random::shoot();
112 fteta=std::sin(x1);
113 // The condition
114 if (u1 < fteta) {
115 teta=x1;
116 passe1=1;
117 if (Random::shoot() < 0.5) {
118 teta=pi-teta;
119 }
120 }
121 }
122 fi=(2.0*pi)*Random::shoot();
123
124 // end test
125 ThreeVector mom_nucleon(
126 pn*std::sin(teta)*std::cos(fi),
127 pn*std::sin(teta)*std::sin(fi),
128 pn*std::cos(teta)
129 );
130 if (Random::shoot() < 0.5) {
131 nucleon->setMomentum(mom_nucleon);
132 omega->setMomentum(-mom_nucleon);
133 }
134 else {
135 omega->setMomentum(mom_nucleon);
136 nucleon->setMomentum(-mom_nucleon);
137 }
138 */
139 ThreeVector mom_nucleon = Random::normVector(pn);
140
141 nucleon->setMomentum(mom_nucleon);
142 omega->setMomentum(-mom_nucleon);
143
144 fs->addModifiedParticle(nucleon);
145 fs->addModifiedParticle(omega);
146 }
147
148 }
149