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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 "G4SigmaMinus.hh"
36
37 #include "G4DecayTable.hh"
38 #include "G4ParticleTable.hh"
39 #include "G4PhaseSpaceDecayChannel.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4String.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "G4Types.hh"
44 #include "G4VDecayChannel.hh"
45
46 G4SigmaMinus* G4SigmaMinus::theInstance = nullptr;
47
48 G4SigmaMinus* G4SigmaMinus::Definition()
49 {
50 if (theInstance != nullptr) return theInstance;
51 const G4String name = "sigma-";
52 // search in particle table]
53 G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
54 G4ParticleDefinition* anInstance = pTable->FindParticle(name);
55 if (anInstance == nullptr) {
56 // create particle
57 //
58 // Arguments for constructor are as follows
59 // name mass width charge
60 // 2*spin parity C-conjugation
61 // 2*Isospin 2*Isospin3 G-parity
62 // type lepton number baryon number PDG encoding
63 // stable lifetime decay table
64 // shortlived subType anti_encoding
65
66 // clang-format off
67 anInstance = new G4ParticleDefinition(
68 name, 1.197449*GeV, 4.45e-12*MeV, -1*eplus,
69 1, +1, 0,
70 2, -2, 0,
71 "baryon", 0, +1, 3112,
72 false, 0.1479*ns, nullptr,
73 false, "sigma");
74 // clang-format on
75
76 // Magnetic Moment
77 G4double mN = eplus * hbar_Planck / 2. / (proton_mass_c2 / c_squared);
78 anInstance->SetPDGMagneticMoment(-1.160 * mN);
79
80 // create Decay Table
81 auto table = new G4DecayTable();
82
83 // create decay channels
84 auto mode = new G4VDecayChannel*[1];
85 // sigma- -> neutron + pi-
86 mode[0] = new G4PhaseSpaceDecayChannel("sigma-", 1.00, 2, "neutron", "pi-");
87
88 for (G4int index = 0; index < 1; index++)
89 table->Insert(mode[index]);
90 delete[] mode;
91
92 anInstance->SetDecayTable(table);
93 }
94 theInstance = static_cast<G4SigmaMinus*>(anInstance);
95 return theInstance;
96 }
97
98 G4SigmaMinus* G4SigmaMinus::SigmaMinusDefinition()
99 {
100 return Definition();
101 }
102
103 G4SigmaMinus* G4SigmaMinus::SigmaMinus()
104 {
105 return Definition();
106 }
107