G4Gamma.cc

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// $Id$
//
// 
// ----------------------------------------------------------------------
//      GEANT 4 class implementation file
//
//      History: first implementation, based on object model of
//      4-th April 1996, G.Cosmo
// ****************************************************************
//  New impelemenataion as an utility class  H.Kurashige, 14 July 2004
// ----------------------------------------------------------------
 
#include "G4Gamma.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleTable.hh"
 
// ######################################################################
// ###                            GAMMA                               ###
// ######################################################################
G4Gamma* G4Gamma::theInstance = 0;
 
 
G4Gamma*  G4Gamma::Definition() 
{
  if (theInstance !=0) return theInstance;
 
  const G4String name = "gamma";
  // 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
   anInstance = new G4ParticleDefinition(
             name,         0.0*MeV,       0.0*MeV,         0.0, 
            2,              -1,            -1,          
            0,               0,             0,             
          "gamma",               0,             0,          22,
          true,                0.0,          NULL,
             false,           "photon",          22
          );
  }
  theInstance = reinterpret_cast<G4Gamma*>(anInstance);
  return theInstance;
}
 
G4Gamma*  G4Gamma::GammaDefinition() 
{
  return Definition();
}
 
G4Gamma*  G4Gamma::Gamma() 
{
  return Definition();
}