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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 // Pekka Kaitaniemi, CEA and Helsinki Institute of Physics
28 // Joseph Cugnon, University of Liege, Belgium << 28 // Davide Mancusi, CEA
29 // Jean-Christophe David, CEA-Saclay, France << 29 // Alain Boudard, CEA
30 // Pekka Kaitaniemi, CEA-Saclay, France, and H << 30 // Sylvie Leray, CEA
31 // Sylvie Leray, CEA-Saclay, France << 31 // Joseph Cugnon, University of Liege
32 // Davide Mancusi, CEA-Saclay, France <<
33 // 32 //
34 #define INCLXX_IN_GEANT4_MODE 1 33 #define INCLXX_IN_GEANT4_MODE 1
35 34
36 #include "globals.hh" 35 #include "globals.hh"
37 36
38 /** \file G4INCLRecombinationChannel.cc 37 /** \file G4INCLRecombinationChannel.cc
39 * \brief Delta-nucleon recombination channel. 38 * \brief Delta-nucleon recombination channel.
40 * 39 *
41 * \date 25 March 2011 40 * \date 25 March 2011
42 * \author Davide Mancusi 41 * \author Davide Mancusi
43 */ 42 */
44 43
45 #include "G4INCLRecombinationChannel.hh" 44 #include "G4INCLRecombinationChannel.hh"
46 #include "G4INCLRandom.hh" 45 #include "G4INCLRandom.hh"
47 #include "G4INCLKinematicsUtils.hh" 46 #include "G4INCLKinematicsUtils.hh"
48 #include "G4INCLParticleTable.hh" 47 #include "G4INCLParticleTable.hh"
49 #include "G4INCLBinaryCollisionAvatar.hh" 48 #include "G4INCLBinaryCollisionAvatar.hh"
50 #include "G4INCLGlobals.hh" 49 #include "G4INCLGlobals.hh"
51 50
52 // #include <cassert> 51 // #include <cassert>
53 52
54 namespace G4INCL { 53 namespace G4INCL {
55 54
56 RecombinationChannel::RecombinationChannel(P 55 RecombinationChannel::RecombinationChannel(Particle *p1, Particle *p2)
57 { 56 {
58 if(p1->isDelta()) { 57 if(p1->isDelta()) {
59 // assert(p2->isNucleon()); 58 // assert(p2->isNucleon());
60 theDelta = p1; 59 theDelta = p1;
61 theNucleon = p2; 60 theNucleon = p2;
62 } else { 61 } else {
63 // assert(p1->isNucleon()); 62 // assert(p1->isNucleon());
64 theDelta = p2; 63 theDelta = p2;
65 theNucleon = p1; 64 theNucleon = p1;
66 } 65 }
67 } 66 }
68 67
69 RecombinationChannel::~RecombinationChannel( 68 RecombinationChannel::~RecombinationChannel()
70 { 69 {
71 } 70 }
72 71
73 void RecombinationChannel::fillFinalState(Fi << 72 FinalState* RecombinationChannel::getFinalState()
74 { 73 {
75 // Compute the total available energy in t 74 // Compute the total available energy in the CM
76 const G4double sqrts = KinematicsUtils::to 75 const G4double sqrts = KinematicsUtils::totalEnergyInCM(theDelta, theNucleon);
77 76
78 // Assign the types of the final-state par 77 // Assign the types of the final-state particles
79 switch(theDelta->getType()) { 78 switch(theDelta->getType()) {
80 case DeltaPlusPlus: 79 case DeltaPlusPlus:
81 // assert(theNucleon->getType()!=Proton); 80 // assert(theNucleon->getType()!=Proton);
82 theDelta->setType(Proton); 81 theDelta->setType(Proton);
83 theNucleon->setType(Proton); 82 theNucleon->setType(Proton);
84 break; 83 break;
85 case DeltaPlus: 84 case DeltaPlus:
86 theDelta->setType(Proton); 85 theDelta->setType(Proton);
87 break; 86 break;
88 case DeltaZero: 87 case DeltaZero:
89 theDelta->setType(Neutron); 88 theDelta->setType(Neutron);
90 break; 89 break;
91 case DeltaMinus: 90 case DeltaMinus:
92 // assert(theNucleon->getType()!=Neutron); 91 // assert(theNucleon->getType()!=Neutron);
93 theDelta->setType(Neutron); 92 theDelta->setType(Neutron);
94 theNucleon->setType(Neutron); 93 theNucleon->setType(Neutron);
95 break; 94 break;
96 default: 95 default:
97 INCL_ERROR("Unknown particle type in R << 96 INCL_ERROR("Unknown particle type in RecombinationChannel" << std::endl);
98 break; 97 break;
99 } 98 }
100 99
101 // Calculate the momenta of the nucleons i 100 // Calculate the momenta of the nucleons in the final state
102 const G4double pCM = KinematicsUtils::mome 101 const G4double pCM = KinematicsUtils::momentumInCM(sqrts, theDelta->getMass(), theNucleon->getMass());
103 102
104 // The angular distribution of final-state 103 // The angular distribution of final-state nucleons is isotropic
105 ThreeVector momentum = Random::normVector( 104 ThreeVector momentum = Random::normVector(pCM);
106 105
107 // Assign the momenta 106 // Assign the momenta
108 theDelta->setMomentum(momentum); 107 theDelta->setMomentum(momentum);
109 theNucleon->setMomentum(-momentum); 108 theNucleon->setMomentum(-momentum);
110 109
111 // Update the kinetic energies 110 // Update the kinetic energies
112 theDelta->adjustEnergyFromMomentum(); 111 theDelta->adjustEnergyFromMomentum();
113 theNucleon->adjustEnergyFromMomentum(); 112 theNucleon->adjustEnergyFromMomentum();
114 113
115 // Create the final state 114 // Create the final state
>> 115 FinalState *fs = new FinalState();
116 fs->addModifiedParticle(theDelta); 116 fs->addModifiedParticle(theDelta);
117 fs->addModifiedParticle(theNucleon); 117 fs->addModifiedParticle(theNucleon);
>> 118
>> 119 return fs;
118 120
119 } 121 }
120 122
121 } 123 }
122 124