G4LFission Class Reference

#include <G4LFission.hh>

Inheritance diagram for G4LFission:

Public Member Functions
	G4LFission (const G4String &name="G4LFission")
	~G4LFission ()
G4HadFinalState *	ApplyYourself (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
virtual void	ModelDescription (std::ostream &outFile) const
virtual const std::pair < G4double, G4double >	GetFatalEnergyCheckLevels () const
Public Member Functions inherited from G4HadronicInteraction
	G4HadronicInteraction (const G4String &modelName="HadronicModel")
virtual	~G4HadronicInteraction ()
virtual G4double	SampleInvariantT (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A)
virtual G4bool	IsApplicable (const G4HadProjectile &, G4Nucleus &)
G4double	GetMinEnergy () const
G4double	GetMinEnergy (const G4Material *aMaterial, const G4Element *anElement) const
void	SetMinEnergy (G4double anEnergy)
void	SetMinEnergy (G4double anEnergy, const G4Element *anElement)
void	SetMinEnergy (G4double anEnergy, const G4Material *aMaterial)
G4double	GetMaxEnergy () const
G4double	GetMaxEnergy (const G4Material *aMaterial, const G4Element *anElement) const
void	SetMaxEnergy (const G4double anEnergy)
void	SetMaxEnergy (G4double anEnergy, const G4Element *anElement)
void	SetMaxEnergy (G4double anEnergy, const G4Material *aMaterial)
const G4HadronicInteraction *	GetMyPointer () const
virtual G4int	GetVerboseLevel () const
virtual void	SetVerboseLevel (G4int value)
const G4String &	GetModelName () const
void	DeActivateFor (const G4Material *aMaterial)
void	ActivateFor (const G4Material *aMaterial)
void	DeActivateFor (const G4Element *anElement)
void	ActivateFor (const G4Element *anElement)
G4bool	IsBlocked (const G4Material *aMaterial) const
G4bool	IsBlocked (const G4Element *anElement) const
void	SetRecoilEnergyThreshold (G4double val)
G4double	GetRecoilEnergyThreshold () const
G4bool	operator== (const G4HadronicInteraction &right) const
G4bool	operator!= (const G4HadronicInteraction &right) const
virtual std::pair< G4double, G4double >	GetEnergyMomentumCheckLevels () const
void	SetEnergyMomentumCheckLevels (G4double relativeLevel, G4double absoluteLevel)

Static Public Member Functions
static G4double	Atomas (const G4double A, const G4double Z)

Additional Inherited Members
Protected Member Functions inherited from G4HadronicInteraction
void	SetModelName (const G4String &nam)
G4bool	IsBlocked () const
void	Block ()
Protected Attributes inherited from G4HadronicInteraction
G4HadFinalState	theParticleChange
G4int	verboseLevel
G4double	theMinEnergy
G4double	theMaxEnergy
G4bool	isBlocked

Detailed Description

Definition at line 65 of file G4LFission.hh.

Constructor & Destructor Documentation

G4LFission::G4LFission

(

const G4String &

name = "G4LFission"

)

Definition at line 50 of file G4LFission.cc.

References DBL_MAX, python.hepunit::GeV, G4HadronicInteraction::SetMaxEnergy(), and G4HadronicInteraction::SetMinEnergy().

 : G4HadronicInteraction(name)
{
  init();
  SetMinEnergy(0.0*GeV);
  SetMaxEnergy(DBL_MAX);
}

G4LFission::~G4LFission

(

)

Definition at line 59 of file G4LFission.cc.

References G4HadFinalState::Clear(), and G4HadronicInteraction::theParticleChange.

{
  theParticleChange.Clear();
}

Member Function Documentation

G4HadFinalState * G4LFission::ApplyYourself ( const G4HadProjectile &  aTrack, G4Nucleus &  targetNucleus  )

virtual

Implements G4HadronicInteraction.

Definition at line 94 of file G4LFission.cc.

References test::a, G4HadFinalState::AddSecondary(), Atomas(), G4HadFinalState::Clear(), G4cout, G4endl, G4UniformRand, G4Gamma::GammaDefinition(), G4HadProjectile::Get4Momentum(), G4Nucleus::GetA_asInt(), G4HadProjectile::GetDefinition(), G4DynamicParticle::GetDefinition(), G4HadProjectile::GetKineticEnergy(), G4HadSecondary::GetParticle(), G4ParticleDefinition::GetPDGCharge(), G4ParticleDefinition::GetPDGMass(), G4HadFinalState::GetSecondary(), G4HadProjectile::GetTotalEnergy(), G4DynamicParticle::GetTotalEnergy(), G4HadProjectile::GetTotalMomentum(), G4DynamicParticle::GetTotalMomentum(), G4Nucleus::GetZ_asInt(), python.hepunit::MeV, N, G4Neutron::NeutronDefinition(), G4InuclParticleNames::nn, G4InuclParticleNames::pp, G4DynamicParticle::SetKineticEnergy(), G4DynamicParticle::SetMomentumDirection(), G4HadFinalState::SetStatusChange(), G4INCL::DeJongSpin::shoot(), stopAndKill, G4HadronicInteraction::theParticleChange, python.hepunit::twopi, CLHEP::HepLorentzVector::vect(), G4HadronicInteraction::verboseLevel, CLHEP::Hep3Vector::x(), CLHEP::Hep3Vector::y(), and CLHEP::Hep3Vector::z().

{
  theParticleChange.Clear();
  const G4HadProjectile* aParticle = &aTrack;

  G4double N = targetNucleus.GetA_asInt();
  G4double Z = targetNucleus.GetZ_asInt();
  theParticleChange.SetStatusChange(stopAndKill);

  G4double P = aParticle->GetTotalMomentum()/MeV;
  G4double Px = aParticle->Get4Momentum().vect().x();
  G4double Py = aParticle->Get4Momentum().vect().y();
  G4double Pz = aParticle->Get4Momentum().vect().z();
  G4double E = aParticle->GetTotalEnergy()/MeV;
  G4double E0 = aParticle->GetDefinition()->GetPDGMass()/MeV;
  G4double Q = aParticle->GetDefinition()->GetPDGCharge();
  if (verboseLevel > 1) {
      G4cout << "G4LFission:ApplyYourself: incident particle:" << G4endl;
      G4cout << "P      " << P << " MeV/c" << G4endl;
      G4cout << "Px     " << Px << " MeV/c" << G4endl;
      G4cout << "Py     " << Py << " MeV/c" << G4endl;
      G4cout << "Pz     " << Pz << " MeV/c" << G4endl;
      G4cout << "E      " << E << " MeV" << G4endl;
      G4cout << "mass   " << E0 << " MeV" << G4endl;
      G4cout << "charge " << Q << G4endl;
  }
  // GHEISHA ADD operation to get total energy, mass, charge:
   if (verboseLevel > 1) {
      G4cout << "G4LFission:ApplyYourself: material:" << G4endl;
      G4cout << "A      " << N << G4endl;
      G4cout << "Z      " << Z << G4endl;
      G4cout << "atomic mass " << 
        Atomas(N, Z) << "MeV" << G4endl;
   }
  E = E + Atomas(N, Z);
  G4double E02 = E*E - P*P;
  E0 = std::sqrt(std::abs(E02));
  if (E02 < 0) E0 = -E0;
  Q = Q + Z;
  if (verboseLevel > 1) {
      G4cout << "G4LFission:ApplyYourself: total:" << G4endl;
      G4cout << "E      " << E << " MeV" << G4endl;
      G4cout << "mass   " << E0 << " MeV" << G4endl;
      G4cout << "charge " << Q << G4endl;
  }
  Px = -Px;
  Py = -Py;
  Pz = -Pz;

  G4double e1 = aParticle->GetKineticEnergy()/MeV;
   if (e1 < 1.) e1 = 1.;

// Average number of neutrons
   G4double avern = 2.569 + 0.559*std::log(e1);
   G4bool photofission = 0;      // For now
// Take the following value if photofission is not included
   if (!photofission) avern = 2.569 + 0.900*std::log(e1);

// Average number of gammas
   G4double averg = 9.500 + 0.600*std::log(e1);

   G4double ran = G4RandGauss::shoot();
// Number of neutrons
   G4int nn = static_cast<G4int>(avern + ran*1.23 + 0.5);
   ran = G4RandGauss::shoot();
// Number of gammas
   G4int ng = static_cast<G4int>(averg + ran*3. + 0.5);
   if (nn < 1) nn = 1;
   if (ng < 1) ng = 1;
   G4double exn = 0.;
   G4double exg = 0.;

// Make secondary neutrons and distribute kinetic energy
   G4DynamicParticle* aNeutron;
   G4int i;
   for (i = 1; i <= nn; i++) {
      ran = G4UniformRand();
      G4int j;
      for (j = 1; j <= 10; j++) {
         if (ran < spneut[j-1]) goto label12;
      }
      j = 10;
    label12:
      ran = G4UniformRand();
      G4double ekin = (j - 1)*1. + ran;
      exn = exn + ekin;
      aNeutron = new G4DynamicParticle(G4Neutron::NeutronDefinition(),
                                       G4ParticleMomentum(1.,0.,0.),
                                       ekin*MeV);
      theParticleChange.AddSecondary(aNeutron);
   }

// Make secondary gammas and distribute kinetic energy
   G4DynamicParticle* aGamma;
   for (i = 1; i <= ng; i++) {
      ran = G4UniformRand();
      G4double ekin = -0.87*std::log(ran);
      exg = exg + ekin;
      aGamma = new G4DynamicParticle(G4Gamma::GammaDefinition(),
                                     G4ParticleMomentum(1.,0.,0.),
                                     ekin*MeV);
      theParticleChange.AddSecondary(aGamma);
   }

// Distribute momentum vectors and do Lorentz transformation

   G4HadSecondary* theSecondary;

   for (i = 1; i <= nn + ng; i++) {
      G4double ran1 = G4UniformRand();
      G4double ran2 = G4UniformRand();
      G4double cost = -1. + 2.*ran1;
      G4double sint = std::sqrt(std::abs(1. - cost*cost));
      G4double phi = ran2*twopi;
      //      G4cout << ran1 << " " << ran2 << G4endl;
      //      G4cout << cost << " " << sint << " " << phi << G4endl;
      theSecondary = theParticleChange.GetSecondary(i - 1);
      G4double pp = theSecondary->GetParticle()->GetTotalMomentum()/MeV;
      G4double px = pp*sint*std::sin(phi);
      G4double py = pp*sint*std::cos(phi);
      G4double pz = pp*cost;
      //      G4cout << pp << G4endl;
      //      G4cout << px << " " << py << " " << pz << G4endl;
      G4double e = theSecondary->GetParticle()->GetTotalEnergy()/MeV;
      G4double e0 = theSecondary->GetParticle()->GetDefinition()->GetPDGMass()/MeV;

      G4double a = px*Px + py*Py + pz*Pz;
      a = (a/(E + E0) - e)/E0;

      px = px + a*Px;
      py = py + a*Py;
      pz = pz + a*Pz;
      G4double p2 = px*px + py*py + pz*pz;
      pp = std::sqrt(p2);
      e = std::sqrt(e0*e0 + p2);
      G4double ekin = e - theSecondary->GetParticle()->GetDefinition()->GetPDGMass()/MeV;
      theSecondary->GetParticle()->SetMomentumDirection(G4ParticleMomentum(px/pp,
                                                            py/pp,
                                                            pz/pp));
      theSecondary->GetParticle()->SetKineticEnergy(ekin*MeV);
   }
   
  return &theParticleChange;
}

G4double G4LFission::Atomas ( const G4double  A, const G4double  Z  )

static

Definition at line 243 of file G4LFission.cc.

References G4Alpha::AlphaDefinition(), G4Deuteron::DeuteronDefinition(), G4Electron::ElectronDefinition(), G4ParticleDefinition::GetPDGMass(), iz, python.hepunit::MeV, G4Neutron::NeutronDefinition(), and G4Proton::ProtonDefinition().

Referenced by ApplyYourself().

{
  G4double rmel = G4Electron::ElectronDefinition()->GetPDGMass()/MeV;
  G4double rmp  = G4Proton::ProtonDefinition()->GetPDGMass()/MeV;
  G4double rmn  = G4Neutron::NeutronDefinition()->GetPDGMass()/MeV;
  G4double rmd  = G4Deuteron::DeuteronDefinition()->GetPDGMass()/MeV;
  G4double rma  = G4Alpha::AlphaDefinition()->GetPDGMass()/MeV;

  G4int ia = static_cast<G4int>(A + 0.5);
   if (ia < 1) return 0;
   G4int iz = static_cast<G4int>(Z + 0.5);
   if (iz < 0) return 0;
   if (iz > ia) return 0;

   if (ia == 1) {
      if (iz == 0) return rmn;          //neutron
      if (iz == 1) return rmp + rmel;   //Hydrogen
   }
   else if (ia == 2 && iz == 1) {
      return rmd;                       //Deuteron
   }
   else if (ia == 4 && iz == 2) {
      return rma;                       //Alpha
   }

  G4double mass = (A - Z)*rmn + Z*rmp + Z*rmel - 15.67*A
                  + 17.23*std::pow(A, 2./3.)
                  + 93.15*(A/2. - Z)*(A/2. - Z)/A
                  + 0.6984523*Z*Z/std::pow(A, 1./3.);
  G4int ipp = (ia - iz)%2;
  G4int izz = iz%2;
  if (ipp == izz) mass = mass + (ipp + izz -1)*12.*std::pow(A, -0.5);

  return mass;
}

const std::pair< G4double, G4double > G4LFission::GetFatalEnergyCheckLevels ( ) const

virtual

Reimplemented from G4HadronicInteraction.

Definition at line 279 of file G4LFission.cc.

References python.hepunit::GeV, and python.hepunit::perCent.

{
  // max energy non-conservation is mass of heavy nucleus
  return std::pair<G4double, G4double>(5*perCent,250*GeV);
}

void G4LFission::ModelDescription ( std::ostream &  outFile ) const

virtual

Reimplemented from G4HadronicInteraction.

Definition at line 65 of file G4LFission.cc.

{
  outFile << "G4LFission is one of the Low Energy Parameterized\n"
          << "(LEP) models used to implement neutron-induced fission of\n"
          << "nuclei.  It is a re-engineered version of the GHEISHA code\n"
          << "of H. Fesefeldt which emits neutrons and gammas but no\n"
          << "nuclear fragments.  The model is applicable to all incident\n"
          << "neutron energies.\n";
}

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

• G4LFission.hh
• G4LFission.cc