G4HyperNucleiProperties.cc

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// G4HyperNucleiProperties class implementation
//
// Author: Mikhail Kosov
// Revision: H.Kurashige, Migrated to particles category - September 2007
// --------------------------------------------------------------------
 
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4HyperNucleiProperties.hh"
#include "G4NucleiProperties.hh"
#include "G4ParticleTable.hh"
#include "G4Exp.hh"
#include "G4Pow.hh"
 
 
G4double G4HyperNucleiProperties::GetNuclearMass(G4int A, G4int Z, G4int LL)
{ 
  if ( LL == 0 ) return  G4NucleiProperties::GetNuclearMass(A, Z);
 
  if ( A < 2 || Z < 0 || Z > A-LL || LL > A )
  {
#ifdef G4VERBOSE
    if ( G4ParticleTable::GetParticleTable()->GetVerboseLevel() > 0 )
    {
      G4cout << "G4HyperNucleiProperties::GetNuclearMass: "
             << " Wrong values for A = " << A 
             << " Z = " << Z 
             << " L = " << LL
             << G4endl;
    }
#endif
    return 0.0;
  }
  else if ( A == 2 )
  {
#ifdef G4VERBOSE
    if ( G4ParticleTable::GetParticleTable()->GetVerboseLevel() > 0 )
    {
      G4cout << "G4HyperNucleiProperties::GetNuclearMass: "
             << " No boud state for A = " << A 
             << " Z = " << Z 
             << " L = " << LL
             << G4endl;
    }
#endif
    return 0.0;
  }
  
  static const G4double b7  = 25.0*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-LL, Z);  // A non-"strange" nucleus
 
  // Temporarily, the mass of the Lambda below is copied from G4Lambda.cc,
  // but it should be added in CLHEP/Units/PhysicalConstants.h
  const G4double mLL = 1.115683*CLHEP::GeV;
 
  G4double bs = 0.0;
  if      ( A - LL == 2 ) bs = a2;          // for nnL,npL,ppL
  else if ( A - LL == 3 ) bs = a3;          // for 3nL,2npL,n2pL,3pL
  else if ( A - LL > 3  ) bs = b7*G4Exp(-b8/(A-LL+1.0));
  mass += LL*(mLL-bs) + eps;
 
  return mass;
}
 
 
G4double G4HyperNucleiProperties::GetAtomicMass(G4int A, G4int Z, G4int LL)
{
  G4double mass = GetNuclearMass(A, Z, LL);
  if ( mass > 0.0 ) {
    mass += Z*electron_mass_c2 - 1.433e-5*MeV*G4Pow::GetInstance()->powZ(Z, 2.39);
  }
  return mass;
}