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1 //
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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 "G4PionMinus.hh"
36
37 #include "G4DecayTable.hh"
38 #include "G4ParticleTable.hh"
39 #include "G4PhaseSpaceDecayChannel.hh"
40 #include "G4String.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4VDecayChannel.hh"
43
44 G4PionMinus* G4PionMinus::theInstance = nullptr;
45
46 G4PionMinus* G4PionMinus::Definition()
47 {
48 if (theInstance != nullptr) return theInstance;
49 const G4String name = "pi-";
50 // search in particle table]
51 G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
52 G4ParticleDefinition* anInstance = pTable->FindParticle(name);
53 if (anInstance == nullptr) {
54 // create particle
55 //
56 // Arguments for constructor are as follows
57 // name mass width charge
58 // 2*spin parity C-conjugation
59 // 2*Isospin 2*Isospin3 G-parity
60 // type lepton number baryon number PDG encoding
61 // stable lifetime decay table
62 // shortlived subType anti_encoding
63
64 // clang-format off
65 anInstance = new G4ParticleDefinition(
66 name, 0.1395701*GeV, 2.5284e-14*MeV, -1.*eplus,
67 0, -1, 0,
68 2, -2, -1,
69 "meson", 0, 0, -211,
70 false, 26.033*ns, nullptr,
71 false, "pi");
72 // clang-format on
73
74 // create Decay Table
75 auto table = new G4DecayTable();
76
77 // create a decay channel
78 // pi- -> mu- + anti_nu_mu
79 G4VDecayChannel* mode = new G4PhaseSpaceDecayChannel("pi-", 1.00, 2, "mu-", "anti_nu_mu");
80 table->Insert(mode);
81
82 anInstance->SetDecayTable(table);
83 }
84 theInstance = static_cast<G4PionMinus*>(anInstance);
85 return theInstance;
86 }
87
88 G4PionMinus* G4PionMinus::PionMinusDefinition()
89 {
90 return Definition();
91 }
92
93 G4PionMinus* G4PionMinus::PionMinus()
94 {
95 return Definition();
96 }
97