Geant4  10.01.p02
G4Neutron.cc
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27 // $Id: G4Neutron.cc 83749 2014-09-12 12:14:59Z 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 July 1996
36 // add neutron life time Oct 17 2000
37 // **********************************************************************
38 // New impelemenataion as an utility class M.Asai, 26 July 2004
39 // ----------------------------------------------------------------------
40 
41 #include "G4Neutron.hh"
42 #include "G4PhysicalConstants.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "G4ParticleTable.hh"
45 
47 #include "G4DecayTable.hh"
48 
49 // ######################################################################
50 // ### NEUTRON ###
51 // ######################################################################
53 
55 {
56  if (theInstance !=0) return theInstance;
57  const G4String name = "neutron";
58  // search in particle table]
60  G4Ions* anInstance = reinterpret_cast<G4Ions*>(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  // use constants in CLHEP
73  // static const double neutron_mass_c2 = 939.56563 * MeV;
74 
75  anInstance = new G4Ions(
76  name, neutron_mass_c2, 7.477e-28*GeV, 0.0,
77  1, +1, 0,
78  1, -1, 0,
79  "baryon", 0, +1, 2112,
80  false, 880.3*second, NULL,
81  false, "nucleon", -2112,
82  0.0, 0
83  );
84  // Magnetic Moment
85  G4double mN = eplus*hbar_Planck/2./(proton_mass_c2 /c_squared);
86  anInstance->SetPDGMagneticMoment( -1.9130427 * mN);
87  //create Decay Table
88  G4DecayTable* table = new G4DecayTable();
89  // create a decay channel
90  G4VDecayChannel* mode = new G4NeutronBetaDecayChannel("neutron",1.00);
91  table->Insert(mode);
92  anInstance->SetDecayTable(table);
93 
94  }
95  theInstance = reinterpret_cast<G4Neutron*>(anInstance);
96  return theInstance;
97 }
98 
100 {
101  return Definition();
102 }
103 
105 {
106  return Definition();
107 }
108 
void SetDecayTable(G4DecayTable *aDecayTable)
G4ParticleDefinition * FindParticle(G4int PDGEncoding)
G4Ions()
Definition: G4Ions.hh:62
G4String name
Definition: TRTMaterials.hh:40
Definition: G4Ions.hh:51
static const double second
Definition: G4SIunits.hh:138
static const double GeV
Definition: G4SIunits.hh:196
static G4Neutron * Neutron()
Definition: G4Neutron.cc:104
void Insert(G4VDecayChannel *aChannel)
Definition: G4DecayTable.cc:60
static G4ParticleTable * GetParticleTable()
static G4Neutron * Definition()
Definition: G4Neutron.cc:54
double G4double
Definition: G4Types.hh:76
static const double eplus
Definition: G4SIunits.hh:178
static G4Neutron * NeutronDefinition()
Definition: G4Neutron.cc:99
static G4Neutron * theInstance
Definition: G4Neutron.hh:54
void SetPDGMagneticMoment(G4double mageticMoment)