Geant4 Cross Reference

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Geant4/particles/hadrons/ions/src/G4AntiDoubleHyperDoubleNeutron.cc

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  1 //
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 25 //
 26 // Author:       2021 Alberto Ribon
 27 //
 28 //----------------------------------------------------------------------------
 29 
 30 #include "G4AntiDoubleHyperDoubleNeutron.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 G4AntiDoubleHyperDoubleNeutron* G4AntiDoubleHyperDoubleNeutron::theInstance = nullptr;
 42 
 43 G4AntiDoubleHyperDoubleNeutron* G4AntiDoubleHyperDoubleNeutron::Definition()
 44 {
 45   if (theInstance != nullptr) return theInstance;
 46   const G4String name = "anti_doublehyperdoubleneutron";
 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,     4110.24*MeV, 2.501e-12*MeV,    0.0*eplus,
 64                                      0,              +1,             0,
 65                                      0,               0,             0,
 66                         "anti_nucleus",               0,            -4,  -1020000040,
 67                                  false,       0.2631*ns,       nullptr,
 68                      false,        "static",    1020000040, 
 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     const G4double half_br_lambda_to_p_pim = 0.5 * 0.639;
 80     const G4double br_lambda_to_n_piz = 0.358;
 81     auto mode = new G4VDecayChannel*[3];
 82     // anti_lambda -> anti_proton + pi+ , with 50% probability of capturing the anti_proton
 83     mode[0] = new G4PhaseSpaceDecayChannel("anti_doublehyperdoubleneutron", half_br_lambda_to_p_pim,
 84                                            5, "anti_neutron", "anti_neutron", "anti_lambda",
 85                                            "anti_proton", "pi+");
 86     mode[1] = new G4PhaseSpaceDecayChannel("anti_doublehyperdoubleneutron", half_br_lambda_to_p_pim,
 87                                            2, "anti_hyperH4", "pi+");
 88     // anti_lambda -> anti_neutron + pi0 , without any possibility of capturing the anti_neutron
 89     mode[2] = new G4PhaseSpaceDecayChannel("anti_doublehyperdoubleneutron", br_lambda_to_n_piz, 5,
 90                                            "anti_neutron", "anti_neutron", "anti_lambda",
 91                                            "anti_neutron", "pi0");
 92     for (G4int index = 0; index < 3; ++index)
 93       table->Insert(mode[index]);
 94     delete[] mode;
 95     anInstance->SetDecayTable(table);
 96   }
 97   theInstance = static_cast<G4AntiDoubleHyperDoubleNeutron*>(anInstance);
 98   return theInstance;
 99 }
100 
101 G4AntiDoubleHyperDoubleNeutron*
102 G4AntiDoubleHyperDoubleNeutron::AntiDoubleHyperDoubleNeutronDefinition()
103 {
104   return Definition();
105 }
106 
107 G4AntiDoubleHyperDoubleNeutron* G4AntiDoubleHyperDoubleNeutron::AntiDoubleHyperDoubleNeutron()
108 {
109   return Definition();
110 }
111