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1 //
2 // ********************************************************************
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18 // * This code implementation is the result of the scientific and *
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24 // ********************************************************************
25 //
26 // ----------------------------------------------------------------------
27 // GEANT 4 class implementation file
28 //
29 // History: first implementation, based on object model of
30 // 4th April 1996, G.Cosmo
31 // **********************************************************************
32 // New impelemenataion as an utility class M.Asai, 26 July 2004
33 // ----------------------------------------------------------------------
34
35 #include "G4Positron.hh"
36
37 #include "G4ParticleTable.hh"
38 #include "G4PhysicalConstants.hh"
39 #include "G4String.hh"
40 #include "G4SystemOfUnits.hh"
41 #include "G4Types.hh"
42
43 G4Positron* G4Positron::theInstance = nullptr;
44
45 G4Positron* G4Positron::Definition()
46 {
47 if (theInstance != nullptr) return theInstance;
48 const G4String name = "e+";
49 // search in particle table]
50 G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
51 G4ParticleDefinition* anInstance = pTable->FindParticle(name);
52 if (anInstance == nullptr) {
53 // create particle
54 //
55 // Arguments for constructor are as follows
56 // name mass width charge
57 // 2*spin parity C-conjugation
58 // 2*Isospin 2*Isospin3 G-parity
59 // type lepton number baryon number PDG encoding
60 // stable lifetime decay table
61 // shortlived subType anti_encoding
62 // use constants in CLHEP
63 // static const double electron_mass_c2 = 0.51099906 * MeV;
64
65 // clang-format off
66 anInstance = new G4ParticleDefinition(
67 name, electron_mass_c2, 0.0*MeV, +1.*eplus,
68 1, 0, 0,
69 0, 0, 0,
70 "lepton", -1, 0, -11,
71 true, -1.0, nullptr,
72 false, "e"
73 );
74 // clang-format on
75
76 // Bohr Magnetron
77 G4double muB = 0.5 * eplus * hbar_Planck / (electron_mass_c2 / c_squared);
78
79 anInstance->SetPDGMagneticMoment(muB * 1.00115965218076);
80 }
81 theInstance = static_cast<G4Positron*>(anInstance);
82 return theInstance;
83 }
84
85 G4Positron* G4Positron::PositronDefinition()
86 {
87 return Definition();
88 }
89
90 G4Positron* G4Positron::Positron()
91 {
92 return Definition();
93 }
94