G4Positron.cc

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//
// $Id$
//
// 
// ----------------------------------------------------------------------
//      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 "G4Positron.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleTable.hh"
    
// ######################################################################
// ###                         POSITRON                               ###
// ######################################################################
G4Positron* G4Positron::theInstance = 0;
 
G4Positron* G4Positron::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<G4Positron*>(anInstance);
  return theInstance;
}
 
G4Positron*  G4Positron::PositronDefinition()
{
  return Definition();
}
 
G4Positron*  G4Positron::Positron()
{
  return Definition();
}