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//
// $Id: G4Electron.cc,v 1.17 2008/11/13 08:23:12 kurasige Exp $
// GEANT4 tag $Name: geant4-09-02-cand-01 $
//
// 
// ----------------------------------------------------------------------
//      GEANT 4 class implementation file
//
//      History: first implementation, based on object model of
//      4th April 1996, G.Cosmo
// **********************************************************************
//  New impelemenataion as an utility class  M.Asai, 26 July 2004
// ----------------------------------------------------------------------

#include "G4Electron.hh"
#include "G4ParticleTable.hh"

// ######################################################################
// ###                         ELECTRON                               ###
// ######################################################################
G4Electron* G4Electron::theInstance = 0;

G4Electron* G4Electron::Definition()
{
  if (theInstance !=0) return theInstance;
  const G4String name = "e-";
  // 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 electron_mass_c2 = 0.51099906 * MeV;

    anInstance = new G4ParticleDefinition(
                 name,  electron_mass_c2,       0.0*MeV,    -1.*eplus, 
		    1,                 0,             0,          
		    0,                 0,             0,             
	     "lepton",                 1,             0,          11,
		 true,              -1.0,          NULL,
             false,                  "e"
              );
    // Bohr Magnetron
   G4double muB =  -0.5*eplus*hbar_Planck/(electron_mass_c2/c_squared) ;
   
   anInstance->SetPDGMagneticMoment( muB * 2.* 1.0011596521859 );

  }
  theInstance = reinterpret_cast<G4Electron*>(anInstance);
  return theInstance;
}

G4Electron*  G4Electron::ElectronDefinition()
{
  return Definition();
}

G4Electron*  G4Electron::Electron()
{
  return Definition();
}


