G4Positron.cc

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//
// ----------------------------------------------------------------------
//      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 "G4ParticleTable.hh"
#include "G4PhysicalConstants.hh"
#include "G4String.hh"
#include "G4SystemOfUnits.hh"
#include "G4Types.hh"
 
G4Positron* G4Positron::theInstance = nullptr;
 
G4Positron* G4Positron::Definition()
{
  if (theInstance != nullptr) return theInstance;
  const G4String name = "e+";
  // search in particle table]
  G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* anInstance = pTable->FindParticle(name);
  if (anInstance == nullptr) {
    // 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;
 
    // clang-format off
   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,          nullptr,
               false,              "e"
              );
    // clang-format on
 
    // Bohr Magnetron
    G4double muB = 0.5 * eplus * hbar_Planck / (electron_mass_c2 / c_squared);
 
    anInstance->SetPDGMagneticMoment(muB * 1.00115965218076);
  }
  theInstance = static_cast<G4Positron*>(anInstance);
  return theInstance;
}
 
G4Positron* G4Positron::PositronDefinition()
{
  return Definition();
}
 
G4Positron* G4Positron::Positron()
{
  return Definition();
}