G4VPreCompoundFragment.cc

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// $Id$
//
// J. M. Quesada (August 2008).  Based  on previous work by V. Lara
//
// Modified:
// 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers
//                         use int Z and A and cleanup

#include "G4VPreCompoundFragment.hh"
#include "G4SystemOfUnits.hh"
#include "G4PreCompoundParameters.hh"
#include "G4NucleiProperties.hh"

G4VPreCompoundFragment::G4VPreCompoundFragment(
  const G4ParticleDefinition* part, G4VCoulombBarrier* aCoulombBarrier)
  : particle(part), theCoulombBarrierPtr(aCoulombBarrier),
    theRestNucleusA(0),theRestNucleusZ(0),theBindingEnergy(0.0), 
    theMaximalKineticEnergy(-MeV),theRestNucleusMass(0.0),
    theReducedMass(0.0),theMomentum(0.,0.,0.,0.),
    theEmissionProbability(0.0),theCoulombBarrier(0.0),
    OPTxs(3),useSICB(false)
{
  theA = particle->GetBaryonNumber();
  theZ = G4int(particle->GetPDGCharge()/eplus + 0.1);
  theMass = particle->GetPDGMass();
  theParameters = G4PreCompoundParameters::GetAddress();
  g4pow = G4Pow::GetInstance();
  theRestNucleusA13 = 0;
}

G4VPreCompoundFragment::~G4VPreCompoundFragment()
{}

std::ostream& 
operator << (std::ostream &out, const G4VPreCompoundFragment &theFragment)
{
  out << &theFragment;
  return out; 
}

std::ostream& 
operator << (std::ostream &out, const G4VPreCompoundFragment *theFragment)
{
  out 
    << "PreCompoundModel Emitted Fragment: Z= " << theFragment->GetZ() 
    << " A= " << theFragment->GetA()
    << " Mass(GeV)= " << theFragment->GetNuclearMass()/CLHEP::GeV;
  return out;
}

void 
G4VPreCompoundFragment::Initialize(const G4Fragment & aFragment)
{
  theRestNucleusA = aFragment.GetA_asInt() - theA;
  theRestNucleusZ = aFragment.GetZ_asInt() - theZ;

  if ((theRestNucleusA < theRestNucleusZ) ||
      (theRestNucleusA < theA) ||
      (theRestNucleusZ < theZ)) 
    {
      // In order to be sure that emission probability will be 0.
      theMaximalKineticEnergy = 0.0;
      return;
    }

  theRestNucleusA13 = g4pow->Z13(theRestNucleusA);
    
  // Calculate Coulomb barrier
  theCoulombBarrier = theCoulombBarrierPtr->
    GetCoulombBarrier(theRestNucleusA,theRestNucleusZ,
              aFragment.GetExcitationEnergy());

  // Calculate masses
  theRestNucleusMass = 
    G4NucleiProperties::GetNuclearMass(theRestNucleusA, theRestNucleusZ);
  theReducedMass = theRestNucleusMass*theMass/(theRestNucleusMass + theMass);

  // Compute Binding Energies for fragments 
  // needed to separate a fragment from the nucleus
  theBindingEnergy = 
    theRestNucleusMass + theMass - aFragment.GetGroundStateMass();
    
  // Compute Maximal Kinetic Energy which can be carried by fragments 
  // after separation - the true assimptotic value
  G4double Ecm  = aFragment.GetMomentum().m();
  theMaximalKineticEnergy = 
    ((Ecm-theRestNucleusMass)*(Ecm+theRestNucleusMass) + theMass*theMass)/(2.0*Ecm)-theMass;
}