G4StatMFMacroTriNucleon.cc

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

#include "G4StatMFMacroTriNucleon.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4Log.hh"
#include "G4Exp.hh"
#include "G4Pow.hh"

G4StatMFMacroTriNucleon::G4StatMFMacroTriNucleon() 
  : G4VStatMFMacroCluster(3) 
{}

G4StatMFMacroTriNucleon::~G4StatMFMacroTriNucleon() 
{}

G4double 
G4StatMFMacroTriNucleon::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;
  static const G4double degeneracy = 4.0;  // H3 + He3

  // old value was 9.224*MeV
  G4double BindingE = G4NucleiProperties::GetBindingEnergy(theA,1); 
  //    + G4NucleiProperties::GetBindingEnergy(theA,2);

  G4double exponent = (BindingE+ theA*(mu+nu*theZARatio) - 
           G4StatMFParameters::GetCoulomb()*theZARatio*theZARatio
           *theA*G4Pow::GetInstance()->Z23(theA))/T;
  if (exponent > 300.0) exponent = 300.0;

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

G4double G4StatMFMacroTriNucleon::CalcEnergy(const G4double T)
{
  return _Energy  = -G4NucleiProperties::GetBindingEnergy(theA,1) + 
    G4StatMFParameters::GetCoulomb() * theZARatio * theZARatio 
    * theA*G4Pow::GetInstance()->Z23(theA) + 1.5 * T;
}

G4double 
G4StatMFMacroTriNucleon::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;
    Entropy = _MeanMultiplicity*(2.5 + G4Log((4*theA)*std::sqrt((G4double)theA)
               *FreeVol/(lambda3*_MeanMultiplicity)));
  }       
  return Entropy;
}