G4HyperNucleiProperties.cc

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// $Id$
// 
// ------------------------------------------------------------
//      GEANT 4 class header file 
//
// ------------------------------------------------------------
// Hyper Nuclei properties based on CHIPS model (Mikhail KOSOV)
// Migrate into particles category by H.Kurashige (Sep. 2007)
// 
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4HyperNucleiProperties.hh"
#include "G4NucleiProperties.hh"
#include "G4ParticleTable.hh"


G4double G4HyperNucleiProperties::GetNuclearMass(G4int A, G4int Z, G4int L)
{
  if (L==0) return  G4NucleiProperties::GetNuclearMass(A, Z);
  
  G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
  if (A < 2 || Z < 0 || Z > A-L || L>A ) {
#ifdef G4VERBOSE
    if (pTable->GetVerboseLevel()>0) {
      G4cout << "G4HyperNucleiProperties::GetNuclearMass: "
             << " Wrong values for A = " << A 
             << " Z = " << Z 
             << " L = " << L
             << G4endl;
    }
#endif
    return 0.0;
  } else if( A==2 ) {
#ifdef G4VERBOSE
    if (pTable->GetVerboseLevel()>0) {
      G4cout << "G4HyperNucleiProperties::GetNuclearMass: "
             << " No boud state for A = " << A 
             << " Z = " << Z 
             << " L = " << L
             << G4endl;
    }
#endif
    return 0.0;
  }

  
  G4ParticleDefinition* lambda = pTable->FindParticle("lambda");
  if (lambda ==0) {
#ifdef G4VERBOSE
    if (pTable->GetVerboseLevel()>0) {
      G4cout << "G4HyperNucleiProperties::GetNuclearMass: "
             << " Lambda is not defined " << G4endl;
    }
#endif
    return 0.0;
  }
  const G4double mL= lambda->GetPDGMass(); // mLambda

  static const G4double b7=25.*MeV;
  static const G4double b8=10.5; // Slope
  static const G4double a2=0.13*MeV; // BindingEnergy for d+Lambda(MeV)
  static const G4double a3=2.2*MeV;  // BindingEnergy for (t/He3)+Lamb(MeV)
  static const G4double eps =0.0001*MeV; // security value (MeV)

  G4double mass =  G4NucleiProperties::GetNuclearMass(A-L, Z); 
  // A non-"strange" nucleus
  G4double bs=0.;
  if     (A-L ==2) bs=a2;         // for nnL,npL,ppL
  else if(A-L ==3) bs=a3;         // for 3nL,2npL,n2pL,3pL
  else if(A-L >3)  bs=b7*std::exp(-b8/(A-L+1.));
  mass += L*(mL-bs) + eps;

  return mass;
}


G4double G4HyperNucleiProperties::GetAtomicMass(G4int A, G4int Z, G4int L)
{
  if (A < 1 || Z < 0 || Z > A-L || L > A || L <0 ) {
#ifdef G4VERBOSE
    if (G4ParticleTable::GetParticleTable()->GetVerboseLevel()>0) {
      G4cout << "G4HyperNucleiProperties::GetAtomicMass: " 
             << " Wrong values for A = "  << A 
             << "  Z = " << Z 
             << "  L = " << L  << G4endl;
    }
#endif
    return 0.0;
    
  } else {
    G4double nuclearMass = GetNuclearMass(A, Z, L);
    return nuclearMass + Z*electron_mass_c2
         - 1.433e-5*MeV*std::pow(G4double(Z),2.39);
  }
}

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