Gabriele Cosmo
109 lines
4.9 KiB
C++
109 lines
4.9 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// Author: 2021 Alberto Ribon
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//
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//----------------------------------------------------------------------------
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#include "G4HyperTriton.hh"
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#include "G4DecayTable.hh"
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#include "G4ParticleTable.hh"
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#include "G4PhaseSpaceDecayChannel.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4String.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4Types.hh"
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#include "G4VDecayChannel.hh"
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G4HyperTriton* G4HyperTriton::theInstance = nullptr;
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G4HyperTriton* G4HyperTriton::Definition()
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{
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if (theInstance != nullptr) return theInstance;
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const G4String name = "hypertriton";
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// search in particle table
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G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
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auto anInstance = static_cast<G4Ions*>(pTable->FindParticle(name));
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if (anInstance == nullptr) {
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// create particle
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//
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// Arguments for constructor are as follows
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// name mass width charge
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// 2*spin parity C-conjugation
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// 2*Isospin 2*Isospin3 G-parity
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// type lepton number baryon number PDG encoding
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// stable lifetime decay table
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// shortlived subType anti_encoding
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// excitation
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// clang-format off
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anInstance = new G4Ions( name, 2991.17*MeV, 2.501e-12*MeV, +1.0*eplus,
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1, +1, 0,
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0, 0, 0,
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"nucleus", 0, +3, 1010010030,
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false, 0.2631*ns, nullptr,
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false, "static", -1010010030,
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0.0, 0 );
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// clang-format on
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// Magnetic Moment
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G4double mN = eplus * hbar_Planck / 2.0 / (proton_mass_c2 / c_squared);
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anInstance->SetPDGMagneticMoment(2.97896248 * mN);
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// create Decay Table
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auto table = new G4DecayTable;
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// create decay channels
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const G4double half_br_lambda_to_p_pim = 0.5 * 0.639;
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const G4double half_br_lambda_to_n_piz = 0.5 * 0.358;
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auto mode = new G4VDecayChannel*[4];
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// lambda -> proton + pi- , with 50% probability of capturing the proton
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mode[0] = new G4PhaseSpaceDecayChannel("hypertriton", half_br_lambda_to_p_pim, 3, "deuteron",
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"proton", "pi-");
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mode[1] = new G4PhaseSpaceDecayChannel("hypertriton", half_br_lambda_to_p_pim, 2, "He3", "pi-");
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// lambda -> neutron + pi0 , with 50% probability of capturing the neutron
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mode[2] = new G4PhaseSpaceDecayChannel("hypertriton", half_br_lambda_to_n_piz, 3, "deuteron",
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"neutron", "pi0");
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mode[3] =
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new G4PhaseSpaceDecayChannel("hypertriton", half_br_lambda_to_n_piz, 2, "triton", "pi0");
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for (G4int index = 0; index < 4; ++index)
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table->Insert(mode[index]);
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delete[] mode;
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anInstance->SetDecayTable(table);
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}
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theInstance = static_cast<G4HyperTriton*>(anInstance);
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return theInstance;
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}
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G4HyperTriton* G4HyperTriton::HyperTritonDefinition()
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{
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return Definition();
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}
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G4HyperTriton* G4HyperTriton::HyperTriton()
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{
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return Definition();
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}
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