G4StatMFMacroBiNucleon.cc

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

#include "G4StatMFMacroBiNucleon.hh"
#include "G4StatMFParameters.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4Log.hh"
#include "G4Exp.hh"
#include "G4Pow.hh"

// Operators

static const G4double degeneracy = 3.0;

G4StatMFMacroBiNucleon & G4StatMFMacroBiNucleon::
operator=(const G4StatMFMacroBiNucleon & )
{
    throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroBiNucleon::operator= meant to not be accessible");
    return *this;
}

G4bool G4StatMFMacroBiNucleon::operator==(const G4StatMFMacroBiNucleon & ) const
{
    throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroBiNucleon::operator== meant to not be accessible");
    return false;
}
 

G4bool G4StatMFMacroBiNucleon::operator!=(const G4StatMFMacroBiNucleon & ) const
{
    throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroBiNucleon::operator!= meant to not be accessible");
    return true;
}

G4double G4StatMFMacroBiNucleon::CalcMeanMultiplicity(const G4double FreeVol, 
                  const G4double mu, 
                  const G4double nu, 
                  const G4double T)
{
  G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
  G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
    
  const G4double BindingE = G4NucleiProperties::GetBindingEnergy(theA,1); 
  //old value was 2.796*MeV
  G4double exponent = (BindingE + theA*(mu+nu*theZARatio) - 
           G4StatMFParameters::GetCoulomb()*theZARatio*theZARatio*theA
           *G4Pow::GetInstance()->Z23(theA))/T;

  // To avoid numerical problems
  if (exponent < -300.0) exponent = -300.0;
  else if (exponent > 300.0) exponent = 300.0;

  _MeanMultiplicity = (degeneracy*FreeVol*theA*std::sqrt((G4double)theA)/lambda3)*
    G4Exp(exponent);
       
  return _MeanMultiplicity;
}

G4double G4StatMFMacroBiNucleon::CalcEnergy(const G4double T)
{
  _Energy  = -G4NucleiProperties::GetBindingEnergy(theA,1) + 
    G4StatMFParameters::GetCoulomb() * theZARatio * theZARatio 
    * theA*G4Pow::GetInstance()->Z23(theA) + 1.5*T;
              
  return _Energy;       
}

G4double G4StatMFMacroBiNucleon::CalcEntropy(const G4double T, const G4double FreeVol)
{
  G4double Entropy = 0.0;
  if (_MeanMultiplicity > 0.0) {
    G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
    G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
    // Is this formula correct?
    Entropy = _MeanMultiplicity*(2.5+G4Log(3.0*theA*std::sqrt((G4double)theA)*FreeVol
               /(lambda3*_MeanMultiplicity)));
  }
  return Entropy;
}