G4INCL::PionNucleonChannel Class Reference

#include <G4INCLPionNucleonChannel.hh>

Inheritance diagram for G4INCL::PionNucleonChannel:

Public Member Functions
	PionNucleonChannel (Particle *, Particle *, Nucleus *)
virtual	~PionNucleonChannel ()
FinalState *	getFinalState ()
Public Member Functions inherited from G4INCL::IChannel
	IChannel ()
virtual	~IChannel ()

Detailed Description

Definition at line 46 of file G4INCLPionNucleonChannel.hh.

Constructor & Destructor Documentation

G4INCL::PionNucleonChannel::PionNucleonChannel	(	Particle *	p1,
		Particle *	p2,
		Nucleus *	nucleus
	)

Definition at line 46 of file G4INCLPionNucleonChannel.cc.

    : theNucleus(nucleus), particle1(p1), particle2(p2)
  {

  }

G4INCL::PionNucleonChannel::~PionNucleonChannel ( )

virtual

Definition at line 52 of file G4INCLPionNucleonChannel.cc.

                                         {

  }

Member Function Documentation

FinalState * G4INCL::PionNucleonChannel::getFinalState ( )

virtual

Implements G4INCL::IChannel.

Definition at line 56 of file G4INCLPionNucleonChannel.cc.

References G4INCL::FinalState::addDestroyedParticle(), G4INCL::FinalState::addModifiedParticle(), G4INCL::NuclearPotential::INuclearPotential::computePotentialEnergy(), G4INCL::DeltaMinus, G4INCL::DeltaPlus, G4INCL::DeltaPlusPlus, G4INCL::DeltaZero, G4INCL::Particle::getEnergy(), G4INCL::Particle::getMomentum(), G4INCL::Nucleus::getPotential(), G4INCL::Particle::getPotentialEnergy(), INCL_ERROR, G4INCL::Particle::isNucleon(), G4INCL::ParticleConfig::isPair(), G4INCL::ThreeVector::mag2(), G4INCL::Neutron, G4InuclParticleNames::nucleon(), G4INCL::PiMinus, G4InuclParticleNames::pion(), G4INCL::PiPlus, G4INCL::PiZero, G4INCL::Proton, G4INCL::Particle::setEnergy(), G4INCL::Particle::setMass(), G4INCL::Particle::setMomentum(), G4INCL::Particle::setType(), and G4INCL::Nucleus::updatePotentialEnergy().

                                                {
    FinalState *fs = new FinalState;

    Particle * nucleon;
    Particle * pion;
    if(particle1->isNucleon()) {
      nucleon = particle1;
      pion = particle2;
    } else {
      nucleon = particle2;
      pion = particle1;
    }

    ParticleType deltaType = DeltaZero;
    if(ParticleConfig::isPair(particle1, particle2, Proton, PiPlus)) {
      deltaType = DeltaPlusPlus;
    } else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiPlus)) {
      deltaType = DeltaPlus;
    } else if(ParticleConfig::isPair(particle1, particle2, Proton, PiZero)) {
      deltaType = DeltaPlus;
    } else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiZero)) {
      deltaType = DeltaZero;
    } else if(ParticleConfig::isPair(particle1, particle2, Proton, PiMinus)) {
      deltaType = DeltaZero;
    } else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiMinus)) {
      deltaType = DeltaMinus;
    } else {
      INCL_ERROR("Unknown particle pair in Pi-N collision." << std::endl);
    }

    G4double deltaEnergy = nucleon->getEnergy() - nucleon->getPotentialEnergy()
      + pion->getEnergy() - pion->getPotentialEnergy();

    nucleon->setType(deltaType); // nucleon becomes the delta
    deltaEnergy += theNucleus->getPotential()->computePotentialEnergy(nucleon);
    nucleon->setEnergy(deltaEnergy); // set the energy of the delta

    ThreeVector deltaMomentum = nucleon->getMomentum() + pion->getMomentum();
    nucleon->setMomentum(deltaMomentum);

    const G4double deltaMass = std::sqrt(deltaEnergy*deltaEnergy - deltaMomentum.mag2());
    nucleon->setMass(deltaMass);
    theNucleus->updatePotentialEnergy(nucleon);

    fs->addModifiedParticle(nucleon); // nucleon became a delta
    fs->addDestroyedParticle(pion);  // pion was removed
    return fs;
  }

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The documentation for this class was generated from the following files:

• G4INCLPionNucleonChannel.hh
• G4INCLPionNucleonChannel.cc