Geant4  10.02.p01
G4INCLReflectionChannel.cc
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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 
39 #include "G4INCLFinalState.hh"
40 #include "G4INCLRandom.hh"
42 
43 #include <cmath>
44 
45 namespace G4INCL {
46  const G4double ReflectionChannel::sinMinReflectionAngleSquaredOverFour = std::pow(std::sin(2.*Math::pi/200.),2.);
48 
50  :theNucleus(n),theParticle(p)
51  {
52  }
53 
55  {
56  }
57 
60 
61  const ThreeVector &oldMomentum = theParticle->getMomentum();
62  const ThreeVector thePosition = theParticle->getPosition();
63  G4double pspr = thePosition.dot(oldMomentum);
64  if(pspr>=0) { // This means that the particle is trying to leave; perform a reflection
65  const G4double x2cour = thePosition.mag2();
66  const ThreeVector newMomentum = oldMomentum - (thePosition * (2.0 * pspr/x2cour));
67  const G4double deltaP2 = (newMomentum-oldMomentum).mag2();
68  theParticle->setMomentum(newMomentum);
69  const G4double minDeltaP2 = sinMinReflectionAngleSquaredOverFour * newMomentum.mag2();
70  if(deltaP2 < minDeltaP2) { // Avoid extremely small reflection angles
72  INCL_DEBUG("Reflection angle for particle " << theParticle->getID() << " was too tangential: " << '\n'
73  << " " << deltaP2 << "=deltaP2<minDeltaP2=" << minDeltaP2 << '\n'
74  << " Resetting the particle position to ("
75  << thePosition.getX() << ", "
76  << thePosition.getY() << ", "
77  << thePosition.getZ() << ")" << '\n');
78  }
80  } else { // The particle momentum is already directed towards the inside of the nucleus; do nothing
81  // ...but make sure this only happened because of the frozen propagation
82 // assert(theParticle->getPosition().dot(theParticle->getPropagationVelocity())>0.);
83  }
84 
87  }
88 }
89 
void updatePotentialEnergy(Particle *p) const
Update the particle potential energy.
G4double dot(const ThreeVector &v) const
Dot product.
Abstract interface to the nuclear potential.
const G4double pi
void fillFinalState(FinalState *fs)
const G4INCL::ThreeVector & getMomentum() const
Get the momentum vector.
G4double getEnergy() const
Get the energy of the particle in MeV.
void thawPropagation()
Unfreeze particle propagation.
G4double mag2() const
Get the square of the length.
G4double getPotentialEnergy() const
Get the particle potential energy.
ReflectionChannel(Nucleus *n, Particle *p)
Final state of an interaction.
virtual void setPosition(const G4INCL::ThreeVector &position)
static const G4double positionScalingFactor
Scaling factor for excessively tangential reflection.
const G4int n
void setTotalEnergyBeforeInteraction(G4double E)
static const G4double sinMinReflectionAngleSquaredOverFour
Sine^2 of the smallest acceptable reflection angle / 4.
const G4INCL::ThreeVector & getPosition() const
Set the position vector.
G4double getX() const
double G4double
Definition: G4Types.hh:76
#define INCL_DEBUG(x)
void addModifiedParticle(Particle *p)
G4double getZ() const
long getID() const
virtual void setMomentum(const G4INCL::ThreeVector &momentum)
Set the momentum vector.
G4double getY() const