G4StatMFMacroNucleon.cc

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

#include "G4StatMFMacroNucleon.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4Log.hh"
#include "G4Exp.hh"

G4StatMFMacroNucleon::G4StatMFMacroNucleon() 
  : G4VStatMFMacroCluster(1), _NeutronMeanMultiplicity(0.0),
    _ProtonMeanMultiplicity(0.0)
{}

G4StatMFMacroNucleon::~G4StatMFMacroNucleon() 
{}
  
G4double 
G4StatMFMacroNucleon::CalcMeanMultiplicity(const G4double FreeVol, 
             const G4double mu, 
             const G4double nu, const G4double T)
{
  if (T <= 0.0) {
    throw G4HadronicException(__FILE__, __LINE__, 
            "G4StatMFMacroNucleon::CalcMeanMultiplicity: Temperature less or equal 0");
  }

  G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
  
  G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
  
  static const G4double degeneracy = 2.0;
  
  G4double exponent_proton = (mu + nu - G4StatMFParameters::GetCoulomb())/T;
  G4double exponent_neutron = mu/T;

  if (exponent_neutron > 300.0) exponent_neutron = 300.0;
  if (exponent_proton > 300.0) exponent_proton = 300.0;

  _NeutronMeanMultiplicity = 
    (degeneracy*FreeVol/lambda3)*G4Exp(exponent_neutron);
  
  _ProtonMeanMultiplicity = 
    (degeneracy*FreeVol/lambda3)*G4Exp(exponent_proton);

  return _MeanMultiplicity = _NeutronMeanMultiplicity + _ProtonMeanMultiplicity;
}


G4double G4StatMFMacroNucleon::CalcEnergy(const G4double T)
{
  return _Energy = G4StatMFParameters::GetCoulomb()*theZARatio*theZARatio + 1.5*T;
}

G4double 
G4StatMFMacroNucleon::CalcEntropy(const G4double T, const G4double FreeVol)
{
  G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
  G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;

  G4double NeutronEntropy = 0.0;
  if (_NeutronMeanMultiplicity > 0.0)
    NeutronEntropy = _NeutronMeanMultiplicity*(2.5+G4Log(2*theA*FreeVol/
          (lambda3*_NeutronMeanMultiplicity)));
        
  G4double ProtonEntropy = 0.0;
  if (_ProtonMeanMultiplicity > 0.0)
    ProtonEntropy = _ProtonMeanMultiplicity*(2.5+G4Log(2*theA*FreeVol/
        (lambda3*_ProtonMeanMultiplicity)));
        
  return NeutronEntropy+ProtonEntropy;
}