G4AntiNeutron.cc

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//
// $Id$
// GEANT4 tag $Name: geant4-09-04-ref-00 $
//
// 
// ----------------------------------------------------------------------
//      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 "G4AntiNeutron.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleTable.hh"

#include "G4NeutronBetaDecayChannel.hh"
#include "G4DecayTable.hh"

// ######################################################################
// ###                          ANTI NEUTRON                          ###
// ######################################################################
G4AntiNeutron* G4AntiNeutron::theInstance = 0;

G4AntiNeutron* G4AntiNeutron::Definition()
{
  if (theInstance !=0) return theInstance;
  const G4String name = "anti_neutron";
  // 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  neutron_mass_c2 = 939.56563 * MeV;

  anInstance = new G4ParticleDefinition(
                 name, neutron_mass_c2, 7.467e-28*GeV,         0.0, 
                    1,              +1,             0,          
                    1,              +1,             0,             
             "baryon",               0,            -1,       -2112,
                 true,    885.7*second,          NULL,
                false,        "nucleon"
              );
    // Magnetic Moment
    G4double mN = eplus*hbar_Planck/2./(proton_mass_c2 /c_squared);
    anInstance->SetPDGMagneticMoment( 1.9130427 * mN);
    //create Decay Table 
    G4DecayTable* table = new G4DecayTable();
    // create a decay channel
    G4VDecayChannel* mode = new G4NeutronBetaDecayChannel("anti_neutron",1.00);
    table->Insert(mode);
    anInstance->SetDecayTable(table);
 
  }
  theInstance = reinterpret_cast<G4AntiNeutron*>(anInstance);
  return theInstance;
}

G4AntiNeutron*  G4AntiNeutron::AntiNeutronDefinition()
{
  return Definition();
}

G4AntiNeutron*  G4AntiNeutron::AntiNeutron()
{
  return Definition();
}

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