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G4Eta.cc
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27 // $Id: G4Eta.cc 79342 2014-02-24 11:42:42Z gcosmo $
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 // H.Kurashige 7 Jul 96
36 // **********************************************************************
37 // New impelemenataion as an utility class M.Asai, 26 July 2004
38 // ----------------------------------------------------------------------
39 // Update mass (PDG2006) Oct. 11 2006 H.Kurashige
40 //
41 
42 #include "G4Eta.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "G4ParticleTable.hh"
45 
47 #include "G4DecayTable.hh"
48 
49 // ######################################################################
50 // ### ETA ###
51 // ######################################################################
52 
53 G4Eta* G4Eta::theInstance = 0;
54 
56 {
57  if (theInstance !=0) return theInstance;
58  const G4String name = "eta";
59  // search in particle table]
61  G4ParticleDefinition* anInstance = pTable->FindParticle(name);
62  if (anInstance ==0)
63  {
64  // create particle
65  //
66  // Arguments for constructor are as follows
67  // name mass width charge
68  // 2*spin parity C-conjugation
69  // 2*Isospin 2*Isospin3 G-parity
70  // type lepton number baryon number PDG encoding
71  // stable lifetime decay table
72  // shortlived subType anti_encoding
73 
74  anInstance = new G4ParticleDefinition(
75  name, 0.547862*GeV, 1.31*keV, 0.0,
76  0, -1, +1,
77  0, 0, +1,
78  "meson", 0, 0, 221,
79  false, 0.0*ns, NULL,
80  false, "eta", 221);
81  //create Decay Table
82  G4DecayTable* table = new G4DecayTable();
83 
84  // create decay channels
85  G4VDecayChannel** mode = new G4VDecayChannel*[4];
86  // eta -> gamma + gamma
87  mode[0] = new G4PhaseSpaceDecayChannel("eta",0.3942,2,"gamma","gamma");
88  // eta -> pi0 + pi0 + pi0
89  mode[1] = new G4PhaseSpaceDecayChannel("eta",0.3256,3,"pi0","pi0","pi0");
90  // eta -> pi0 + pi+ + pi-
91  mode[2] = new G4PhaseSpaceDecayChannel("eta",0.226,3,"pi0","pi+","pi-");
92  // eta -> gamma + pi+ + pi-
93  mode[3] = new G4PhaseSpaceDecayChannel("eta",0.0468,3,"gamma","pi+","pi-");
94 
95  for (G4int index=0; index <4; index++ ) table->Insert(mode[index]);
96  delete [] mode;
97 
98  anInstance->SetDecayTable(table);
99  }
100  theInstance = reinterpret_cast<G4Eta*>(anInstance);
101  return theInstance;
102 }
103 
105 {
106  return Definition();
107 }
108 
110 {
111  return Definition();
112 }
113 
void SetDecayTable(G4DecayTable *aDecayTable)
const XML_Char * name
Definition: expat.h:151
G4ParticleDefinition * FindParticle(G4int PDGEncoding)
int G4int
Definition: G4Types.hh:78
static G4Eta * Eta()
Definition: G4Eta.cc:109
static G4Eta * Definition()
Definition: G4Eta.cc:55
Definition: G4Eta.hh:50
void Insert(G4VDecayChannel *aChannel)
Definition: G4DecayTable.cc:60
static G4ParticleTable * GetParticleTable()
static constexpr double GeV
Definition: G4SIunits.hh:217
static constexpr double keV
Definition: G4SIunits.hh:216
#define ns
Definition: xmlparse.cc:614
static G4Eta * EtaDefinition()
Definition: G4Eta.cc:104