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Geant4/processes/hadronic/models/de_excitation/multifragmentation/src/G4StatMFMacroTriNucleon.cc

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 26 //
 27 //
 28 // Hadronic Process: Nuclear De-excitations
 29 // by V. Lara
 30 
 31 #include "G4StatMFMacroTriNucleon.hh"
 32 #include "G4PhysicalConstants.hh"
 33 #include "G4SystemOfUnits.hh"
 34 #include "G4Log.hh"
 35 #include "G4Exp.hh"
 36 #include "G4Pow.hh"
 37 
 38 G4StatMFMacroTriNucleon::G4StatMFMacroTriNucleon() 
 39   : G4VStatMFMacroCluster(3) 
 40 {}
 41 
 42 G4StatMFMacroTriNucleon::~G4StatMFMacroTriNucleon() 
 43 {}
 44 
 45 G4double 
 46 G4StatMFMacroTriNucleon::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 = 4.0;  // H3 + He3
 54 
 55   // old value was 9.224*MeV
 56   G4double BindingE = G4NucleiProperties::GetBindingEnergy(theA,1); 
 57   //    + G4NucleiProperties::GetBindingEnergy(theA,2);
 58 
 59   G4double exponent = (BindingE+ theA*(mu+nu*theZARatio) - 
 60            G4StatMFParameters::GetCoulomb()*theZARatio*theZARatio
 61            *theA*G4Pow::GetInstance()->Z23(theA))/T;
 62   if (exponent > 300.0) exponent = 300.0;
 63 
 64   _MeanMultiplicity = (degeneracy*FreeVol*theA*std::sqrt((G4double)theA)/lambda3)*
 65     G4Exp(exponent);
 66        
 67   return _MeanMultiplicity;
 68 }
 69 
 70 G4double G4StatMFMacroTriNucleon::CalcEnergy(const G4double T)
 71 {
 72   return _Energy  = -G4NucleiProperties::GetBindingEnergy(theA,1) + 
 73     G4StatMFParameters::GetCoulomb() * theZARatio * theZARatio 
 74     * theA*G4Pow::GetInstance()->Z23(theA) + 1.5 * T;
 75 }
 76 
 77 G4double 
 78 G4StatMFMacroTriNucleon::CalcEntropy(const G4double T, const G4double FreeVol)
 79 {
 80   G4double Entropy = 0.0;
 81   if (_MeanMultiplicity > 0.0) {
 82     G4double ThermalWaveLenght = 16.15*fermi/std::sqrt(T);
 83     G4double lambda3 = ThermalWaveLenght*ThermalWaveLenght*ThermalWaveLenght;
 84     Entropy = _MeanMultiplicity*(2.5 + G4Log((4*theA)*std::sqrt((G4double)theA)
 85                *FreeVol/(lambda3*_MeanMultiplicity)));
 86   }       
 87   return Entropy;
 88 }
 89