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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 "G4INCLReflectionChannel.hh"
39 #include "G4INCLFinalState.hh"
40 #include "G4INCLRandom.hh"
41 #include "G4INCLINuclearPotential.hh"
42
43 #include <cmath>
44
45 namespace G4INCL {
46 const G4double ReflectionChannel::sinMinReflectionAngleSquaredOverFour = std::pow(std::sin(2.*Math::pi/200.),2.);
47 const G4double ReflectionChannel::positionScalingFactor = 0.99;
48
49 ReflectionChannel::ReflectionChannel(Nucleus *n, Particle *p)
50 :theNucleus(n),theParticle(p)
51 {
52 }
53
54 ReflectionChannel::~ReflectionChannel()
55 {
56 }
57
58 void ReflectionChannel::fillFinalState(FinalState *fs) {
59 if(theParticle->getPotentialEnergy() != 0.){
60 theNucleus->updatePotentialEnergy(theParticle); //D
61 }
62 fs->setTotalEnergyBeforeInteraction(theParticle->getEnergy() - theParticle->getPotentialEnergy());
63
64 const ThreeVector &oldMomentum = theParticle->getMomentum();
65 const ThreeVector thePosition = theParticle->getPosition();
66 G4double pspr = thePosition.dot(oldMomentum);
67 if(pspr>=0) { // This means that the particle is trying to leave; perform a reflection
68 const G4double x2cour = thePosition.mag2();
69 const ThreeVector newMomentum = oldMomentum - (thePosition * (2.0 * pspr/x2cour));
70 const G4double deltaP2 = (newMomentum-oldMomentum).mag2();
71 theParticle->setMomentum(newMomentum);
72 const G4double minDeltaP2 = sinMinReflectionAngleSquaredOverFour * newMomentum.mag2();
73 if(deltaP2 < minDeltaP2) { // Avoid extremely small reflection angles
74 theParticle->setPosition(thePosition * positionScalingFactor);
75 INCL_DEBUG("Reflection angle for particle " << theParticle->getID() << " was too tangential: " << '\n'
76 << " " << deltaP2 << "=deltaP2<minDeltaP2=" << minDeltaP2 << '\n'
77 << " Resetting the particle position to ("
78 << thePosition.getX() << ", "
79 << thePosition.getY() << ", "
80 << thePosition.getZ() << ")" << '\n');
81 }
82 if(theParticle->getPotentialEnergy() != 0.){
83 theNucleus->updatePotentialEnergy(theParticle);
84 }
85 } else { // The particle momentum is already directed towards the inside of the nucleus; do nothing
86 // ...but make sure this only happened because of the frozen propagation
87 // assert(theParticle->getPosition().dot(theParticle->getPropagationVelocity())>0.);
88 }
89
90 theParticle->thawPropagation();
91 fs->addModifiedParticle(theParticle);
92 }
93 }
94
95