G4StatMFMacroTetraNucleon.cc

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// $Id: G4StatMFMacroTetraNucleon.cc 68724 2013-04-05 09:26:32Z gcosmo $
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara

#include "G4StatMFMacroTetraNucleon.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"

G4StatMFMacroTetraNucleon::G4StatMFMacroTetraNucleon() 
  : G4VStatMFMacroCluster(4) 
{}

G4StatMFMacroTetraNucleon::~G4StatMFMacroTetraNucleon() 
{}

G4double 
G4StatMFMacroTetraNucleon::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 = 1;  // He4
  const G4double Coulomb = (3./5.)*(elm_coupling/G4StatMFParameters::Getr0())*
    (1.0 - 1.0/std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1./3.));

  //old value was 30.11*MeV
  G4double BindingE = G4NucleiProperties::GetBindingEnergy(theA,2); 
    
  G4double exponent = (BindingE + theA*(mu+nu*theZARatio+T*T/_InvLevelDensity) 
               - Coulomb*theZARatio*theZARatio*
               std::pow(static_cast<G4double>(theA),5./3.))/T;
  if (exponent > 700.0) exponent = 700.0;
    
  _MeanMultiplicity = ( degeneracy*FreeVol*theA* 
            std::sqrt(static_cast<G4double>(theA))/lambda3)* 
    std::exp(exponent);
             
  return _MeanMultiplicity; 
}


G4double G4StatMFMacroTetraNucleon::CalcEnergy(const G4double T)
{
  G4double Coulomb = (3./5.)*(elm_coupling/G4StatMFParameters::Getr0())*
    (1.0 - 1.0/std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1./3.));
                                    
  return _Energy = -G4NucleiProperties::GetBindingEnergy(theA,2) + 
    Coulomb * theZARatio * theZARatio * 
    std::pow(static_cast<G4double>(theA),5./3.) +
    (3./2.) * T +
    theA * T*T/_InvLevelDensity;
                            
}

G4double 
G4StatMFMacroTetraNucleon::CalcEntropy(const G4double T, 
                       const G4double FreeVol)
{
  G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
  G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;

  G4double Entropy = 0.0;
  if (_MeanMultiplicity > 0.0)
    Entropy = _MeanMultiplicity*(5./2.+
                 std::log(8.0*FreeVol/(lambda3*_MeanMultiplicity)))+ // 8 = theA*std::sqrt(theA)
      8.0*T/_InvLevelDensity;           
                                
  return Entropy;
}