| Geant4 Cross Reference |
1 //
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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 // H.Kurashige 7 Jul 96
32 // **********************************************************************
33 // New impelemenataion as an utility class M.Asai, 26 July 2004
34 // ----------------------------------------------------------------------
35 // Update mass (PDG2006) Oct. 11 2006 H.Kurashige
36 //
37
38 #include "G4Eta.hh"
39
40 #include "G4DecayTable.hh"
41 #include "G4ParticleTable.hh"
42 #include "G4PhaseSpaceDecayChannel.hh"
43 #include "G4String.hh"
44 #include "G4SystemOfUnits.hh"
45 #include "G4Types.hh"
46 #include "G4VDecayChannel.hh"
47
48 G4Eta* G4Eta::theInstance = nullptr;
49
50 G4Eta* G4Eta::Definition()
51 {
52 if (theInstance != nullptr) return theInstance;
53 const G4String name = "eta";
54 // search in particle table]
55 G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
56 G4ParticleDefinition* anInstance = pTable->FindParticle(name);
57 if (anInstance == nullptr) {
58 // create particle
59 //
60 // Arguments for constructor are as follows
61 // name mass width charge
62 // 2*spin parity C-conjugation
63 // 2*Isospin 2*Isospin3 G-parity
64 // type lepton number baryon number PDG encoding
65 // stable lifetime decay table
66 // shortlived subType anti_encoding
67
68 // clang-format off
69 anInstance = new G4ParticleDefinition(
70 name, 0.547862*GeV, 1.31*keV, 0.0,
71 0, -1, +1,
72 0, 0, +1,
73 "meson", 0, 0, 221,
74 false, 0.0*ns, nullptr,
75 false, "eta", 221);
76 // clang-format on
77
78 // create Decay Table
79 auto table = new G4DecayTable();
80
81 // create decay channels
82 auto mode = new G4VDecayChannel*[4];
83 // eta -> gamma + gamma
84 mode[0] = new G4PhaseSpaceDecayChannel("eta", 0.3942, 2, "gamma", "gamma");
85 // eta -> pi0 + pi0 + pi0
86 mode[1] = new G4PhaseSpaceDecayChannel("eta", 0.3256, 3, "pi0", "pi0", "pi0");
87 // eta -> pi0 + pi+ + pi-
88 mode[2] = new G4PhaseSpaceDecayChannel("eta", 0.226, 3, "pi0", "pi+", "pi-");
89 // eta -> gamma + pi+ + pi-
90 mode[3] = new G4PhaseSpaceDecayChannel("eta", 0.0468, 3, "gamma", "pi+", "pi-");
91
92 for (G4int index = 0; index < 4; index++)
93 table->Insert(mode[index]);
94 delete[] mode;
95
96 anInstance->SetDecayTable(table);
97 }
98 theInstance = static_cast<G4Eta*>(anInstance);
99 return theInstance;
100 }
101
102 G4Eta* G4Eta::EtaDefinition()
103 {
104 return Definition();
105 }
106
107 G4Eta* G4Eta::Eta()
108 {
109 return Definition();
110 }
111