G4StatMFMacroMultiNucleon.cc

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// $Id$
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara
//
// Modified:
// 25.07.08 I.Pshenichnov (in collaboration with Alexander Botvina and Igor 
//          Mishustin (FIAS, Frankfurt, INR, Moscow and Kurchatov Institute, 
//          Moscow, pshenich@fias.uni-frankfurt.de) fixed computation of the 
//          symmetry energy 

#include "G4StatMFMacroMultiNucleon.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"

// Default constructor
G4StatMFMacroMultiNucleon::
G4StatMFMacroMultiNucleon() :
    G4VStatMFMacroCluster(0)  // Beacuse the def. constr. of base class is private
{
    throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiNucleon::default_constructor meant to not be accessable");
}

// Copy constructor
G4StatMFMacroMultiNucleon::
G4StatMFMacroMultiNucleon(const G4StatMFMacroMultiNucleon & ) :
    G4VStatMFMacroCluster(0)  // Beacuse the def. constr. of base class is private
{
    throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiNucleon::copy_constructor meant to not be accessable");
}

// Operators

G4StatMFMacroMultiNucleon & G4StatMFMacroMultiNucleon::
operator=(const G4StatMFMacroMultiNucleon & ) 
{
    throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiNucleon::operator= meant to not be accessable");
    return *this;
}


G4bool G4StatMFMacroMultiNucleon::operator==(const G4StatMFMacroMultiNucleon & ) const
{
    throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiNucleon::operator== meant to not be accessable");
    return false;
}
 

G4bool G4StatMFMacroMultiNucleon::operator!=(const G4StatMFMacroMultiNucleon & ) const
{
    throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiNucleon::operator!= meant to not be accessable");
    return true;
}



G4double G4StatMFMacroMultiNucleon::CalcMeanMultiplicity(const G4double FreeVol, const G4double mu,
                                                         const G4double nu, const G4double T)
{
    const G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
        
    const G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
        
    const G4double A23 = std::pow(static_cast<G4double>(theA),2./3.);
        
    const G4double Coulomb = (3./5.)*(elm_coupling/G4StatMFParameters::Getr0())*
        (1.0 - 1.0/std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1./3.));
        
    G4double exponent = (mu + nu*theZARatio+ G4StatMFParameters::GetE0() + T*T/_InvLevelDensity 
                         - G4StatMFParameters::GetGamma0()*(1.0 - 2.0*theZARatio)*
                         (1.0 - 2.0*theZARatio))*theA
        - G4StatMFParameters::Beta(T)*A23 - Coulomb*theZARatio*theZARatio*A23*theA;
        
    exponent /= T;
        
    if (exponent > 30.0) exponent = 30.0;
        
    _MeanMultiplicity = std::max((FreeVol * static_cast<G4double>(theA) * 
                                    std::sqrt(static_cast<G4double>(theA))/lambda3) *
                                   std::exp(exponent),1.0e-30);
    return _MeanMultiplicity;   
}


G4double G4StatMFMacroMultiNucleon::CalcZARatio(const G4double nu)
{
    const G4double Coulomb = (3./5.)*(elm_coupling/G4StatMFParameters::Getr0())*
        (1.0 - 1.0/std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1./3.));

    G4double den = 8.0*G4StatMFParameters::GetGamma0()+2.0*Coulomb*std::pow(static_cast<G4double>(theA),2./3.);
    G4double num = 4.0*G4StatMFParameters::GetGamma0()+nu;
        
    return theZARatio = num/den;
        

}



G4double G4StatMFMacroMultiNucleon::CalcEnergy(const G4double T)
{
    const G4double Coulomb = (3./5.)*(elm_coupling/G4StatMFParameters::Getr0())*
        (1.0 - 1.0/std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1./3.));
        
    const G4double A23 = std::pow(static_cast<G4double>(theA),2./3.);

    // Volume term 
    G4double EVol = static_cast<G4double>(theA) * (T*T/_InvLevelDensity - G4StatMFParameters::GetE0());
        
    // Symmetry term
    G4double ESym = static_cast<G4double>(theA) * G4StatMFParameters::GetGamma0() *(1. - 2.* theZARatio) * (1. - 2.* theZARatio);
        
    // Surface term
    G4double ESurf = A23*(G4StatMFParameters::Beta(T) - T*G4StatMFParameters::DBetaDT(T));
 
    // Coulomb term
    G4double ECoul = Coulomb*A23*static_cast<G4double>(theA)*theZARatio*theZARatio;
        
    // Translational term
    G4double ETrans = (3./2.)*T;
        
       
    return _Energy = EVol + ESurf + ECoul + ETrans + ESym;
}


G4double G4StatMFMacroMultiNucleon::CalcEntropy(const G4double T, const G4double FreeVol)
{
    const G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
    const G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;

    G4double Entropy = 0.0;
    if (_MeanMultiplicity > 0.0) {
        // Volume term
        G4double SV = 2.0*static_cast<G4double>(theA)*T/_InvLevelDensity;
                
        // Surface term
        G4double SS = -G4StatMFParameters::DBetaDT(T)*std::pow(static_cast<G4double>(theA),2./3.);
                
        // Translational term
        G4double ST = (5./2.)+std::log(FreeVol * std::sqrt(static_cast<G4double>(theA)) * 
                                  static_cast<G4double>(theA)/(lambda3*_MeanMultiplicity));
                
                
        Entropy = _MeanMultiplicity*(SV + SS + ST);
    }
                                                                
                                                                
    return Entropy;
}

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