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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 #include "G4INCLReflectionChannel.hh" 37 #include "G4INCLReflectionChannel.hh"
39 #include "G4INCLFinalState.hh" 38 #include "G4INCLFinalState.hh"
40 #include "G4INCLRandom.hh" 39 #include "G4INCLRandom.hh"
41 #include "G4INCLINuclearPotential.hh" 40 #include "G4INCLINuclearPotential.hh"
42 41
43 #include <cmath> 42 #include <cmath>
44 43
45 namespace G4INCL { 44 namespace G4INCL {
46 const G4double ReflectionChannel::sinMinRefl 45 const G4double ReflectionChannel::sinMinReflectionAngleSquaredOverFour = std::pow(std::sin(2.*Math::pi/200.),2.);
47 const G4double ReflectionChannel::positionSc 46 const G4double ReflectionChannel::positionScalingFactor = 0.99;
48 47
49 ReflectionChannel::ReflectionChannel(Nucleus 48 ReflectionChannel::ReflectionChannel(Nucleus *n, Particle *p)
50 :theNucleus(n),theParticle(p) 49 :theNucleus(n),theParticle(p)
51 { 50 {
52 } 51 }
53 52
54 ReflectionChannel::~ReflectionChannel() 53 ReflectionChannel::~ReflectionChannel()
55 { 54 {
56 } 55 }
57 56
58 void ReflectionChannel::fillFinalState(Final << 57 FinalState* ReflectionChannel::getFinalState()
59 if(theParticle->getPotentialEnergy() != 0. << 58 {
60 theNucleus->updatePotentialEnergy(thePar << 59 FinalState *fs = new FinalState(); // Create final state for the output
61 } <<
62 fs->setTotalEnergyBeforeInteraction(thePar 60 fs->setTotalEnergyBeforeInteraction(theParticle->getEnergy() - theParticle->getPotentialEnergy());
63 << 61
64 const ThreeVector &oldMomentum = thePartic 62 const ThreeVector &oldMomentum = theParticle->getMomentum();
65 const ThreeVector thePosition = theParticl << 63 G4double pspr = theParticle->getPosition().dot(oldMomentum);
66 G4double pspr = thePosition.dot(oldMomentu <<
67 if(pspr>=0) { // This means that the parti 64 if(pspr>=0) { // This means that the particle is trying to leave; perform a reflection
68 const G4double x2cour = thePosition.mag2 << 65 const G4double x2cour = theParticle->getPosition().mag2();
69 const ThreeVector newMomentum = oldMomen << 66 const ThreeVector newMomentum = oldMomentum - (theParticle->getPosition() * (2.0 * pspr/x2cour));
70 const G4double deltaP2 = (newMomentum-ol 67 const G4double deltaP2 = (newMomentum-oldMomentum).mag2();
71 theParticle->setMomentum(newMomentum); 68 theParticle->setMomentum(newMomentum);
72 const G4double minDeltaP2 = sinMinReflec 69 const G4double minDeltaP2 = sinMinReflectionAngleSquaredOverFour * newMomentum.mag2();
73 if(deltaP2 < minDeltaP2) { // Avoid extr 70 if(deltaP2 < minDeltaP2) { // Avoid extremely small reflection angles
74 theParticle->setPosition(thePosition * << 71 theParticle->setPosition(theParticle->getPosition() * positionScalingFactor);
75 INCL_DEBUG("Reflection angle for parti << 72 INCL_DEBUG("Reflection angle for particle " << theParticle->getID() << " was too tangential: " << std::endl
76 << " " << deltaP2 << "=deltaP2<mi << 73 << " " << deltaP2 << "=deltaP2<minDeltaP2=" << minDeltaP2 << std::endl
77 << " Resetting the particle posit 74 << " Resetting the particle position to ("
78 << thePosition.getX() << ", " << 75 << theParticle->getPosition().getX() << ", "
79 << thePosition.getY() << ", " << 76 << theParticle->getPosition().getY() << ", "
80 << thePosition.getZ() << ")" << '\ << 77 << theParticle->getPosition().getZ() << ")" << std::endl);
81 } <<
82 if(theParticle->getPotentialEnergy() != <<
83 theNucleus->updatePotentialEnergy(theP <<
84 } 78 }
>> 79 theNucleus->updatePotentialEnergy(theParticle);
85 } else { // The particle momentum is alrea 80 } else { // The particle momentum is already directed towards the inside of the nucleus; do nothing
86 // ...but make sure this only happened b 81 // ...but make sure this only happened because of the frozen propagation
87 // assert(theParticle->getPosition().dot(thePa 82 // assert(theParticle->getPosition().dot(theParticle->getPropagationVelocity())>0.);
88 } 83 }
89 84
90 theParticle->thawPropagation(); 85 theParticle->thawPropagation();
91 fs->addModifiedParticle(theParticle); 86 fs->addModifiedParticle(theParticle);
>> 87 return fs;
92 } 88 }
93 } 89 }
94 90
95 91