| Geant4 Cross Reference |
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
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 "G4SigmaPlus.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 G4SigmaPlus* G4SigmaPlus::theInstance = nullptr;
47
48 G4SigmaPlus* G4SigmaPlus::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, 1.18937*GeV, 8.209e-12*MeV, eplus,
69 1, +1, 0,
70 2, +2, 0,
71 "baryon", 0, +1, 3222,
72 false, 0.08018*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(2.458 * mN);
79
80 // create Decay Table
81 auto table = new G4DecayTable();
82
83 // create decay channels
84 auto mode = new G4VDecayChannel*[2];
85 // sigma+ -> proton + pi0
86 mode[0] = new G4PhaseSpaceDecayChannel("sigma+", 0.516, 2, "proton", "pi0");
87 // sigma+ -> neutron + pi+
88 mode[1] = new G4PhaseSpaceDecayChannel("sigma+", 0.483, 2, "neutron", "pi+");
89
90 for (G4int index = 0; index < 2; index++)
91 table->Insert(mode[index]);
92 delete[] mode;
93
94 anInstance->SetDecayTable(table);
95 }
96 theInstance = static_cast<G4SigmaPlus*>(anInstance);
97 return theInstance;
98 }
99
100 G4SigmaPlus* G4SigmaPlus::SigmaPlusDefinition()
101 {
102 return Definition();
103 }
104
105 G4SigmaPlus* G4SigmaPlus::SigmaPlus()
106 {
107 return Definition();
108 }
109