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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 "G4INCLTransmissionChannel.hh"
39
40 namespace G4INCL {
41
42 TransmissionChannel::TransmissionChannel(Nucleus * const nucleus, Particle * const particle)
43 : theNucleus(nucleus), theParticle(particle),
44 refraction(false),
45 pOutMag(0.),
46 kineticEnergyOutside(initializeKineticEnergyOutside()),
47 cosRefractionAngle(1.)
48 {}
49
50 TransmissionChannel::TransmissionChannel(Nucleus * const nucleus, Particle * const particle, const G4double TOut)
51 : theNucleus(nucleus), theParticle(particle),
52 refraction(false),
53 pOutMag(0.),
54 kineticEnergyOutside(TOut),
55 cosRefractionAngle(1.)
56 {}
57
58 TransmissionChannel::TransmissionChannel(Nucleus * const nucleus, Particle * const particle, const G4double kOut, const G4double cosR)
59 : theNucleus(nucleus), theParticle(particle),
60 refraction(true),
61 pOutMag(kOut),
62 kineticEnergyOutside(initializeKineticEnergyOutside()),
63 cosRefractionAngle(cosR)
64 {}
65
66 TransmissionChannel::~TransmissionChannel() {}
67
68 G4double TransmissionChannel::initializeKineticEnergyOutside() {
69 // The particle energy outside the nucleus. Subtract the nuclear
70 // potential from the kinetic energy when leaving the nucleus
71 G4double TOut = theParticle->getEnergy()
72 - theParticle->getPotentialEnergy()
73 - theParticle->getMass();
74
75 // Correction for real masses
76 const G4int AParent = theNucleus->getA();
77 const G4int ZParent = theNucleus->getZ();
78 const G4int SParent = theNucleus->getS();
79 const G4double theQValueCorrection = theParticle->getEmissionQValueCorrection(AParent,ZParent,SParent);
80 TOut += theQValueCorrection;
81 return TOut;
82 }
83
84 void TransmissionChannel::particleLeaves() {
85
86 // Use the table mass in the outside world
87 theParticle->setTableMass();
88 theParticle->setPotentialEnergy(0.);
89
90 if(refraction) {
91 // Change the momentum direction
92 // The magnitude of the particle momentum outside the nucleus will be
93 // fixed by the kineticEnergyOutside variable. This is done in order to
94 // avoid numerical inaccuracies.
95 const ThreeVector &position = theParticle->getPosition();
96 const G4double r2 = position.mag2();
97 ThreeVector normal;
98 if(r2>0.)
99 normal = position / std::sqrt(r2);
100
101 const ThreeVector &momentum = theParticle->getMomentum();
102
103 const ThreeVector pOut = normal * (pOutMag * cosRefractionAngle) + momentum - normal * normal.dot(momentum);
104 // assert(std::fabs(pOut.mag()-pOutMag)<1.e-5);
105
106 theParticle->setMomentum(pOut);
107 }
108 // Scaling factor for the particle momentum
109 theParticle->setEnergy(kineticEnergyOutside + theParticle->getMass());
110 theParticle->adjustMomentumFromEnergy();
111 }
112
113 void TransmissionChannel::fillFinalState(FinalState *fs) {
114 G4double initialEnergy = 0.0;
115 initialEnergy = theParticle->getEnergy() - theParticle->getPotentialEnergy();
116 // Correction for real masses
117 const G4int AParent = theNucleus->getA();
118 const G4int ZParent = theNucleus->getZ();
119 const G4int SParent = theNucleus->getS();
120 initialEnergy += theParticle->getTableMass() - theParticle->getMass()
121 + theParticle->getEmissionQValueCorrection(AParent,ZParent,SParent);
122 particleLeaves();
123
124 fs->setTotalEnergyBeforeInteraction(initialEnergy);
125 fs->addOutgoingParticle(theParticle); // We write the particle down as outgoing
126 }
127 }
128