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G4INCLReflectionChannel.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file G4INCLReflectionChannel.cc
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//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// INCL++ intra-nuclear cascade model
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// Alain Boudard, CEA-Saclay, France
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// Joseph Cugnon, University of Liege, Belgium
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// Jean-Christophe David, CEA-Saclay, France
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// Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
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// Sylvie Leray, CEA-Saclay, France
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// Davide Mancusi, CEA-Saclay, France
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//
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#define INCLXX_IN_GEANT4_MODE 1
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#include "
globals.hh
"
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#include "
G4INCLReflectionChannel.hh
"
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#include "
G4INCLFinalState.hh
"
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#include "
G4INCLRandom.hh
"
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#include "
G4INCLINuclearPotential.hh
"
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#include <cmath>
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namespace
G4INCL {
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const
G4double
ReflectionChannel::sinMinReflectionAngleSquaredOverFour
= std::pow(std::sin(2.*
Math::pi
/200.),2.);
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const
G4double
ReflectionChannel::positionScalingFactor
= 0.99;
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ReflectionChannel::ReflectionChannel
(
Nucleus
*
n
,
Particle
*
p
)
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:theNucleus(n),theParticle(p)
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{
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}
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ReflectionChannel::~ReflectionChannel
()
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{
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}
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void
ReflectionChannel::fillFinalState
(
FinalState
*
fs
) {
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fs->
setTotalEnergyBeforeInteraction
(
theParticle
->
getEnergy
() -
theParticle
->
getPotentialEnergy
());
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const
ThreeVector
&oldMomentum =
theParticle
->
getMomentum
();
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const
ThreeVector
thePosition =
theParticle
->
getPosition
();
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G4double
pspr = thePosition.
dot
(oldMomentum);
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if
(pspr>=0) {
// This means that the particle is trying to leave; perform a reflection
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const
G4double
x2cour = thePosition.
mag2
();
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const
ThreeVector
newMomentum = oldMomentum - (thePosition * (2.0 * pspr/x2cour));
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const
G4double
deltaP2 = (newMomentum-oldMomentum).mag2();
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theParticle
->
setMomentum
(newMomentum);
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const
G4double
minDeltaP2 =
sinMinReflectionAngleSquaredOverFour
* newMomentum.
mag2
();
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if
(deltaP2 < minDeltaP2) {
// Avoid extremely small reflection angles
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theParticle
->
setPosition
(thePosition *
positionScalingFactor
);
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INCL_DEBUG
(
"Reflection angle for particle "
<<
theParticle
->
getID
() <<
" was too tangential: "
<<
'\n'
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<<
" "
<< deltaP2 <<
"=deltaP2<minDeltaP2="
<< minDeltaP2 <<
'\n'
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<<
" Resetting the particle position to ("
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<< thePosition.
getX
() <<
", "
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<< thePosition.
getY
() <<
", "
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<< thePosition.
getZ
() <<
")"
<<
'\n'
);
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}
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theNucleus
->
updatePotentialEnergy
(
theParticle
);
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}
else
{
// The particle momentum is already directed towards the inside of the nucleus; do nothing
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// ...but make sure this only happened because of the frozen propagation
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// assert(theParticle->getPosition().dot(theParticle->getPropagationVelocity())>0.);
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}
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theParticle
->
thawPropagation
();
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fs->
addModifiedParticle
(
theParticle
);
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}
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}
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geant4
tree
geant4-10.6-release
source
processes
hadronic
models
inclxx
incl_physics
src
G4INCLReflectionChannel.cc
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:45
using
1.8.2 with
ECCE GitHub integration