| 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 "G4SigmaZero.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 "G4VDecayChannel.hh"
44
45 G4SigmaZero* G4SigmaZero::theInstance = nullptr;
46
47 G4SigmaZero* G4SigmaZero::Definition()
48 {
49 if (theInstance != nullptr) return theInstance;
50 const G4String name = "sigma0";
51 // search in particle table]
52 G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
53 G4ParticleDefinition* anInstance = pTable->FindParticle(name);
54 if (anInstance == nullptr) {
55 // create particle
56 //
57 // Arguments for constructor are as follows
58 // name mass width charge
59 // 2*spin parity C-conjugation
60 // 2*Isospin 2*Isospin3 G-parity
61 // type lepton number baryon number PDG encoding
62 // stable lifetime decay table
63 // shortlived subType anti_encoding
64
65 // clang-format off
66 anInstance = new G4ParticleDefinition(
67 name, 1.192642*GeV, 8.9e-3*MeV, 0.0,
68 1, +1, 0,
69 2, 0, 0,
70 "baryon", 0, +1, 3212,
71 false, 7.4e-11*ns, nullptr,
72 false, "sigma");
73 // clang-format on
74
75 // Life time is given from width
76 anInstance->SetPDGLifeTime(hbar_Planck / (anInstance->GetPDGWidth()));
77
78 // create Decay Table
79 auto table = new G4DecayTable();
80
81 // create decay channels
82 // sigma0 -> lambda + gamma
83 G4VDecayChannel* mode = new G4PhaseSpaceDecayChannel("sigma0", 1.000, 2, "lambda", "gamma");
84
85 table->Insert(mode);
86
87 anInstance->SetDecayTable(table);
88 }
89 theInstance = static_cast<G4SigmaZero*>(anInstance);
90 return theInstance;
91 }
92
93 G4SigmaZero* G4SigmaZero::SigmaZeroDefinition()
94 {
95 return Definition();
96 }
97
98 G4SigmaZero* G4SigmaZero::SigmaZero()
99 {
100 return Definition();
101 }
102