G4StatMFFragment.cc

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//
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara

#include "G4StatMFFragment.hh"
#include "G4PhysicalConstants.hh"
#include "G4HadronicException.hh"
#include "G4Pow.hh"

// Copy constructor
G4StatMFFragment::G4StatMFFragment(const G4StatMFFragment & )
{
    throw G4HadronicException(__FILE__, __LINE__, "G4StatMFFragment::copy_constructor meant to not be accessible");
}

// Operators

G4StatMFFragment & G4StatMFFragment::
operator=(const G4StatMFFragment & )
{
    throw G4HadronicException(__FILE__, __LINE__, "G4StatMFFragment::operator= meant to not be accessible");
    return *this;
}

G4bool G4StatMFFragment::operator==(const G4StatMFFragment & ) const
{
//  throw G4HadronicException(__FILE__, __LINE__, "G4StatMFFragment::operator== meant to not be accessible");
    return false;
}
 
G4bool G4StatMFFragment::operator!=(const G4StatMFFragment & ) const
{
//  throw G4HadronicException(__FILE__, __LINE__, "G4StatMFFragment::operator!= meant to not be accessible");
    return true;
}

G4double G4StatMFFragment::GetCoulombEnergy(void) const
{
  G4double res = 0.0;
  if (theZ >= 1) {
    res = G4StatMFParameters::GetCoulomb();
  }
  return res;
}

G4double G4StatMFFragment::GetEnergy(const G4double T) const
{
  if (theA < 1 || theZ < 0 || theZ > theA) {
    G4cout << "G4StatMFFragment::GetEnergy: A = " << theA 
     << ", Z = " << theZ << G4endl;
    throw G4HadronicException(__FILE__, __LINE__, 
            "G4StatMFFragment::GetEnergy: Wrong values for A and Z!");
  }
  G4double BulkEnergy = G4NucleiProperties::GetMassExcess(theA,theZ);
  
  if (theA < 4) return BulkEnergy - GetCoulombEnergy();
  
  G4double SurfaceEnergy;
  if (G4StatMFParameters::DBetaDT(T) == 0.0) SurfaceEnergy = 0.0;
  else SurfaceEnergy = 2.5*G4Pow::GetInstance()->Z23(theA)*T*T*
   G4StatMFParameters::GetBeta0()/
   (G4StatMFParameters::GetCriticalTemp()*
    G4StatMFParameters::GetCriticalTemp());
                   
  G4double ExchangeEnergy = theA*T*T/GetInvLevelDensity();
  if (theA != 4) ExchangeEnergy += SurfaceEnergy;     
  return BulkEnergy + ExchangeEnergy - GetCoulombEnergy();
}

G4double G4StatMFFragment::GetInvLevelDensity(void) const
{
  G4double res = 0.0;
  if (theA > 1) {
    res =  G4StatMFParameters::GetEpsilon0()*(1.0+3.0/(theA - 1.0));
  }
  return res;
}

G4Fragment * G4StatMFFragment::GetFragment(const G4double T)
{
  G4double U = CalcExcitationEnergy(T);
  G4double M = GetNuclearMass();
  G4LorentzVector FourMomentum(_momentum,std::sqrt(_momentum.mag2()+(M+U)*(M+U)));
  G4Fragment * theFragment = new G4Fragment(theA, theZ, FourMomentum);
  return theFragment;
}

G4double G4StatMFFragment::CalcExcitationEnergy(const G4double T)
{
  if (theA <= 3) return 0.0;
  
  G4double BulkEnergy = theA*T*T/GetInvLevelDensity();
  
  // if it is an alpha particle: done
  if (theA == 4) return BulkEnergy;
    
  // Term connected with surface energy
  G4double SurfaceEnergy = 0.0;
  G4double q = G4StatMFParameters::DBetaDT(T);
  if (std::abs(q) > 1.0e-20) { 
    SurfaceEnergy = 2.5*G4Pow::GetInstance()->Z23(theA)
      *(G4StatMFParameters::Beta(T) - T*q - G4StatMFParameters::GetBeta0());
  }
  return BulkEnergy + SurfaceEnergy;
}