G4Electron.cc

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00025 //
00026 //
00027 // $Id$
00028 //
00029 // 
00030 // ----------------------------------------------------------------------
00031 //      GEANT 4 class implementation file
00032 //
00033 //      History: first implementation, based on object model of
00034 //      4th April 1996, G.Cosmo
00035 // **********************************************************************
00036 //  New impelemenataion as an utility class  M.Asai, 26 July 2004
00037 // ----------------------------------------------------------------------
00038 
00039 #include "G4Electron.hh"
00040 #include "G4PhysicalConstants.hh"
00041 #include "G4SystemOfUnits.hh"
00042 #include "G4ParticleTable.hh"
00043 
00044 // ######################################################################
00045 // ###                         ELECTRON                               ###
00046 // ######################################################################
00047 G4Electron* G4Electron::theInstance = 0;
00048 
00049 G4Electron* G4Electron::Definition()
00050 {
00051   if (theInstance !=0) return theInstance;
00052   const G4String name = "e-";
00053   // search in particle table]
00054   G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
00055   G4ParticleDefinition* anInstance = pTable->FindParticle(name);
00056   if (anInstance ==0)
00057   {
00058   // create particle
00059   //
00060   //    Arguments for constructor are as follows
00061   //               name             mass          width         charge
00062   //             2*spin           parity  C-conjugation
00063   //          2*Isospin       2*Isospin3       G-parity
00064   //               type    lepton number  baryon number   PDG encoding
00065   //             stable         lifetime    decay table
00066   //             shortlived      subType    anti_encoding
00067 
00068   // use constants in CLHEP
00069   //  static const double electron_mass_c2 = 0.51099906 * MeV;
00070 
00071     anInstance = new G4ParticleDefinition(
00072                  name,  electron_mass_c2,       0.0*MeV,    -1.*eplus, 
00073                     1,                 0,             0,          
00074                     0,                 0,             0,             
00075              "lepton",                 1,             0,          11,
00076                  true,              -1.0,          NULL,
00077              false,                  "e"
00078               );
00079     // Bohr Magnetron
00080    G4double muB =  -0.5*eplus*hbar_Planck/(electron_mass_c2/c_squared) ;
00081    
00082    anInstance->SetPDGMagneticMoment( muB * 2.* 1.0011596521859 );
00083 
00084   }
00085   theInstance = reinterpret_cast<G4Electron*>(anInstance);
00086   return theInstance;
00087 }
00088 
00089 G4Electron*  G4Electron::ElectronDefinition()
00090 {
00091   return Definition();
00092 }
00093 
00094 G4Electron*  G4Electron::Electron()
00095 {
00096   return Definition();
00097 }
00098 
00099 

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