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// $Id: G4AntiProton.cc,v 1.14 2008/03/06 15:41:57 kurasige Exp $
// GEANT4 tag $Name: geant4-09-04-beta-01 $
//
// 
// ----------------------------------------------------------------------
//      GEANT 4 class implementation file
//
//      History: first implementation, based on object model of
//      4th April 1996, G.Cosmo
//                          H.Kurashige 7 July 1996
// **********************************************************************
//  New impelemenataion as an utility class  M.Asai, 26 July 2004
// ----------------------------------------------------------------

#include "G4AntiProton.hh"
#include "G4ParticleTable.hh"

// ######################################################################
// ###                       ANTIPROTON                               ###
// ######################################################################

G4AntiProton* G4AntiProton::theInstance = 0;

G4AntiProton* G4AntiProton::Definition()
{
  if (theInstance !=0) return theInstance;
  const G4String name = "anti_proton";
  // search in particle table]
  G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* anInstance = pTable->FindParticle(name);
  if (anInstance ==0)
  {
  // create particle
  //
  //    Arguments for constructor are as follows
  //               name             mass          width         charge
  //             2*spin           parity  C-conjugation
  //          2*Isospin       2*Isospin3       G-parity
  //               type    lepton number  baryon number   PDG encoding
  //             stable         lifetime    decay table
  //             shortlived      subType    anti_encoding
  // use constants in CLHEP
  //  static const double   proton_mass_c2 = 938.27231 * MeV;

   anInstance = new G4ParticleDefinition(
                 name,  proton_mass_c2,       0.0*MeV,  -1.0*eplus, 
		    1,              +1,             0,         
		    1,              -1,             0,             
	     "baryon",               0,            -1,       -2212,
		 true,            -1.0,          NULL,
                false,       "nucleon"
              );
    // Magnetic Moment
    G4double mN = eplus*hbar_Planck/2./(proton_mass_c2 /c_squared);
    anInstance->SetPDGMagneticMoment( -2.792847351 * mN);
  }
  theInstance = reinterpret_cast<G4AntiProton*>(anInstance);
  return theInstance;
}

G4AntiProton*  G4AntiProton::AntiProtonDefinition()
{
  return Definition();
}

G4AntiProton*  G4AntiProton::AntiProton()
{
  return Definition();
}