| Geant4 Cross Reference |
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24 // ********************************************************************
25 //
26 // Author: 2021 Alberto Ribon
27 //
28 //----------------------------------------------------------------------------
29
30 #include "G4AntiHyperAlpha.hh"
31
32 #include "G4DecayTable.hh"
33 #include "G4ParticleTable.hh"
34 #include "G4PhaseSpaceDecayChannel.hh"
35 #include "G4PhysicalConstants.hh"
36 #include "G4String.hh"
37 #include "G4SystemOfUnits.hh"
38 #include "G4Types.hh"
39 #include "G4VDecayChannel.hh"
40
41 G4AntiHyperAlpha* G4AntiHyperAlpha::theInstance = nullptr;
42
43 G4AntiHyperAlpha* G4AntiHyperAlpha::Definition()
44 {
45 if (theInstance != nullptr) return theInstance;
46 const G4String name = "anti_hyperalpha";
47 // search in particle table
48 G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
49 auto anInstance = static_cast<G4Ions*>(pTable->FindParticle(name));
50 if (anInstance == nullptr) {
51 // create particle
52 //
53 // Arguments for constructor are as follows
54 // name mass width charge
55 // 2*spin parity C-conjugation
56 // 2*Isospin 2*Isospin3 G-parity
57 // type lepton number baryon number PDG encoding
58 // stable lifetime decay table
59 // shortlived subType anti_encoding
60 // excitation
61
62 // clang-format off
63 anInstance = new G4Ions( name, 3921.87*MeV, 2.501e-12*MeV, -2.0*eplus,
64 0, +1, 0,
65 0, 0, 0,
66 "anti_nucleus", 0, -4, -1010020040,
67 false, 0.2631*ns, nullptr,
68 false, "static", 1010020040,
69 0.0, 0 );
70 // clang-format on
71
72 // Magnetic Moment
73 G4double mN = eplus * hbar_Planck / 2.0 / (proton_mass_c2 / c_squared);
74 anInstance->SetPDGMagneticMoment(2.97896248 * mN);
75
76 // create Decay Table
77 auto table = new G4DecayTable;
78 // create decay channels
79 /*
80 // The decay "mode[1]" produces the secondary "anti_Li4" which is not existing
81 // in Geant4: we therefore skip it for the time being (similarly for hyperalpha,
82 // to keep the symmetry between particle and anti-particle).
83 const G4double half_br_lambda_to_p_pim = 0.5*0.639;
84 const G4double half_br_lambda_to_n_piz = 0.5*0.358;
85 G4VDecayChannel** mode = new G4VDecayChannel*[4];
86 // anti_lambda -> anti_proton + pi+ , with 50% probability of capturing the anti_proton
87 mode[0] = new G4PhaseSpaceDecayChannel( "anti_hyperalpha", half_br_lambda_to_p_pim, 3,
88 "anti_He3", "anti_proton", "pi+" );
89 mode[1] = new G4PhaseSpaceDecayChannel( "anti_hyperalpha", half_br_lambda_to_p_pim, 2,
90 "anti_Li4", "pi+" );
91 // anti_lambda -> anti_neutron + pi0 , with 50% probability of capturing the anti_neutron
92 mode[2] = new G4PhaseSpaceDecayChannel( "anti_hyperalpha", half_br_lambda_to_n_piz, 3,
93 "anti_He3", "anti_neutron", "pi0" );
94 mode[3] = new G4PhaseSpaceDecayChannel( "anti_hyperalpha", half_br_lambda_to_n_piz, 2,
95 "anti_alpha", "pi0" );
96 for ( G4int index = 0; index < 4; ++index ) table->Insert( mode[index] );
97 */
98 // Replacement decay for the time being
99 const G4double br_lambda_to_p_pim = 0.639;
100 const G4double half_br_lambda_to_n_piz = 0.5 * 0.358;
101 auto mode = new G4VDecayChannel*[3];
102 // anti_lambda -> anti_proton + pi+ , with 0% probability of capturing the anti_proton
103 mode[0] = new G4PhaseSpaceDecayChannel("anti_hyperalpha", br_lambda_to_p_pim, 3, "anti_He3",
104 "anti_proton", "pi+");
105 // anti_lambda -> anti_neutron + pi0 , with 50% probability of capturing the anti_neutron
106 mode[1] = new G4PhaseSpaceDecayChannel("anti_hyperalpha", half_br_lambda_to_n_piz, 3,
107 "anti_He3", "anti_neutron", "pi0");
108 mode[2] = new G4PhaseSpaceDecayChannel("anti_hyperalpha", half_br_lambda_to_n_piz, 2,
109 "anti_alpha", "pi0");
110 for (G4int index = 0; index < 3; ++index)
111 table->Insert(mode[index]);
112 //---
113 delete[] mode;
114 anInstance->SetDecayTable(table);
115 }
116 theInstance = static_cast<G4AntiHyperAlpha*>(anInstance);
117 return theInstance;
118 }
119
120 G4AntiHyperAlpha* G4AntiHyperAlpha::AntiHyperAlphaDefinition()
121 {
122 return Definition();
123 }
124
125 G4AntiHyperAlpha* G4AntiHyperAlpha::AntiHyperAlpha()
126 {
127 return Definition();
128 }
129