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Geant4/processes/hadronic/models/de_excitation/multifragmentation/src/G4StatMFMacroNucleon.cc

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 26 //
 27 //
 28 // Hadronic Process: Nuclear De-excitations
 29 // by V. Lara
 30 
 31 #include "G4StatMFMacroNucleon.hh"
 32 #include "G4PhysicalConstants.hh"
 33 #include "G4SystemOfUnits.hh"
 34 #include "G4Log.hh"
 35 #include "G4Exp.hh"
 36 
 37 G4StatMFMacroNucleon::G4StatMFMacroNucleon() 
 38   : G4VStatMFMacroCluster(1), _NeutronMeanMultiplicity(0.0),
 39     _ProtonMeanMultiplicity(0.0)
 40 {}
 41 
 42 G4StatMFMacroNucleon::~G4StatMFMacroNucleon() 
 43 {}
 44   
 45 G4double 
 46 G4StatMFMacroNucleon::CalcMeanMultiplicity(const G4double FreeVol, 
 47              const G4double mu, 
 48              const G4double nu, const G4double T)
 49 {
 50   if (T <= 0.0) {
 51     throw G4HadronicException(__FILE__, __LINE__, 
 52             "G4StatMFMacroNucleon::CalcMeanMultiplicity: Temperature less or equal 0");
 53   }
 54 
 55   G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
 56   
 57   G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
 58   
 59   static const G4double degeneracy = 2.0;
 60   
 61   G4double exponent_proton = (mu + nu - G4StatMFParameters::GetCoulomb())/T;
 62   G4double exponent_neutron = mu/T;
 63 
 64   if (exponent_neutron > 300.0) exponent_neutron = 300.0;
 65   if (exponent_proton > 300.0) exponent_proton = 300.0;
 66 
 67   _NeutronMeanMultiplicity = 
 68     (degeneracy*FreeVol/lambda3)*G4Exp(exponent_neutron);
 69   
 70   _ProtonMeanMultiplicity = 
 71     (degeneracy*FreeVol/lambda3)*G4Exp(exponent_proton);
 72 
 73   return _MeanMultiplicity = _NeutronMeanMultiplicity + _ProtonMeanMultiplicity;
 74 }
 75 
 76 
 77 G4double G4StatMFMacroNucleon::CalcEnergy(const G4double T)
 78 {
 79   return _Energy = G4StatMFParameters::GetCoulomb()*theZARatio*theZARatio + 1.5*T;
 80 }
 81 
 82 G4double 
 83 G4StatMFMacroNucleon::CalcEntropy(const G4double T, const G4double FreeVol)
 84 {
 85   G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
 86   G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
 87 
 88   G4double NeutronEntropy = 0.0;
 89   if (_NeutronMeanMultiplicity > 0.0)
 90     NeutronEntropy = _NeutronMeanMultiplicity*(2.5+G4Log(2*theA*FreeVol/
 91           (lambda3*_NeutronMeanMultiplicity)));
 92         
 93   G4double ProtonEntropy = 0.0;
 94   if (_ProtonMeanMultiplicity > 0.0)
 95     ProtonEntropy = _ProtonMeanMultiplicity*(2.5+G4Log(2*theA*FreeVol/
 96         (lambda3*_ProtonMeanMultiplicity)));
 97         
 98   return NeutronEntropy+ProtonEntropy;
 99 }
100 
101