Geant4  9.6.p02
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G4PionZero.cc
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26 //
27 // $Id$
28 //
29 //
30 // ----------------------------------------------------------------------
31 // GEANT 4 class implementation file
32 //
33 // History: first implementation, based on object model of
34 // 4th April 1996, G.Cosmo
35 // **********************************************************************
36 // New impelemenataion as an utility class M.Asai, 26 July 2004
37 // ----------------------------------------------------------------------
38 
39 #include "G4PionZero.hh"
40 #include "G4SystemOfUnits.hh"
41 #include "G4ParticleTable.hh"
42 
43 
45 #include "G4DalitzDecayChannel.hh"
46 #include "G4DecayTable.hh"
47 
48 // ######################################################################
49 // ### PIONZERO ###
50 // ######################################################################
51 
52 G4PionZero* G4PionZero::theInstance = 0;
53 
55 {
56  if (theInstance !=0) return theInstance;
57  const G4String name = "pi0";
58  // search in particle table]
60  G4ParticleDefinition* anInstance = pTable->FindParticle(name);
61  if (anInstance ==0)
62  {
63  // create particle
64  //
65  // Arguments for constructor are as follows
66  // name mass width charge
67  // 2*spin parity C-conjugation
68  // 2*Isospin 2*Isospin3 G-parity
69  // type lepton number baryon number PDG encoding
70  // stable lifetime decay table
71  // shortlived subType anti_encoding
72 
73  anInstance = new G4ParticleDefinition(
74  name, 0.1349766*GeV, 7.8e-06*MeV, 0.0,
75  0, -1, +1,
76  2, 0, -1,
77  "meson", 0, 0, 111,
78  false, 8.4e-8*ns, NULL,
79  false, "pi", 111);
80 
81  //create Decay Table
82  G4DecayTable* table = new G4DecayTable();
83 
84  // create a decay channel
85  G4VDecayChannel* mode;
86  // pi0 -> gamma + gamma
87  mode = new G4PhaseSpaceDecayChannel("pi0",0.988,2,"gamma","gamma");
88  table->Insert(mode);
89  // pi0 -> gamma + e+ + e-
90  mode = new G4DalitzDecayChannel("pi0",0.012,"e-","e+");
91  table->Insert(mode);
92 
93  anInstance->SetDecayTable(table);
94  }
95  theInstance = reinterpret_cast<G4PionZero*>(anInstance);
96  return theInstance;
97 }
98 
100 {
101  return Definition();
102 }
103 
105 {
106  return Definition();
107 }
108