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Geant4/processes/hadronic/models/de_excitation/multifragmentation/src/G4StatMFMacroTetraNucleon.cc

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 26 //
 27 //
 28 // Hadronic Process: Nuclear De-excitations
 29 // by V. Lara
 30 
 31 #include "G4StatMFMacroTetraNucleon.hh"
 32 #include "G4PhysicalConstants.hh"
 33 #include "G4SystemOfUnits.hh"
 34 #include "G4Log.hh"
 35 #include "G4Exp.hh"
 36 #include "G4Pow.hh"
 37 
 38 G4StatMFMacroTetraNucleon::G4StatMFMacroTetraNucleon() 
 39   : G4VStatMFMacroCluster(4) 
 40 {}
 41 
 42 G4StatMFMacroTetraNucleon::~G4StatMFMacroTetraNucleon() 
 43 {}
 44 
 45 G4double 
 46 G4StatMFMacroTetraNucleon::CalcMeanMultiplicity(const G4double FreeVol, 
 47             const G4double mu, 
 48             const G4double nu, 
 49             const G4double T)
 50 {
 51   G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
 52   G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
 53   static const G4double degeneracy = 1;  // He4
 54 
 55   //old value was 30.11*MeV
 56   G4double BindingE = G4NucleiProperties::GetBindingEnergy(theA,2); 
 57   
 58   G4double exponent = (BindingE + theA*(mu+nu*theZARatio+T*T/_InvLevelDensity) 
 59            - G4StatMFParameters::GetCoulomb()*theZARatio*theZARatio*
 60            theA*G4Pow::GetInstance()->Z23(theA))/T;
 61   if (exponent > 300.0) exponent = 300.0;
 62     
 63   _MeanMultiplicity = ( degeneracy*FreeVol*theA*std::sqrt((G4double)theA)/lambda3)* 
 64     G4Exp(exponent);
 65        
 66   return _MeanMultiplicity; 
 67 }
 68 
 69 G4double G4StatMFMacroTetraNucleon::CalcEnergy(const G4double T)
 70 {
 71   return _Energy = -G4NucleiProperties::GetBindingEnergy(theA,2) + 
 72     G4StatMFParameters::GetCoulomb() * theZARatio * theZARatio * 
 73     theA*G4Pow::GetInstance()->Z23(theA) +
 74     1.5 * T + theA * T*T/_InvLevelDensity;  
 75 }
 76 
 77 G4double 
 78 G4StatMFMacroTetraNucleon::CalcEntropy(const G4double T, 
 79                const G4double FreeVol)
 80 {
 81   G4double Entropy = 0.0;
 82   if (_MeanMultiplicity > 0.0) {
 83     G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
 84     G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
 85     Entropy = _MeanMultiplicity*(2.5 + G4Log(8*FreeVol/(lambda3*_MeanMultiplicity)))+ 
 86       8.0*T/_InvLevelDensity;
 87   }   
 88   return Entropy;
 89 }
 90