Gabriele Cosmo
123 lines
6.3 KiB
C++
123 lines
6.3 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 "G4AntiHyperHe5.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4ParticleTable.hh"
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#include "G4PhaseSpaceDecayChannel.hh"
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#include "G4DecayTable.hh"
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// ##################################################################
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// ### ANTI HYPERHE5 ###
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// ##################################################################
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G4AntiHyperHe5* G4AntiHyperHe5::theInstance = nullptr;
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G4AntiHyperHe5* G4AntiHyperHe5::Definition() {
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if ( theInstance != nullptr ) return theInstance;
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const G4String name = "anti_hyperHe5";
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// search in particle table
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G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
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G4Ions* anInstance = reinterpret_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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anInstance = new G4Ions( name, 4840.00*MeV, 2.501e-12*MeV, -2.0*eplus,
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3, +1, 0,
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0, 0, 0,
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"anti_nucleus", 0, -5, -1010020050,
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false, 0.2631*ns, nullptr,
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false, "static", 1010020050,
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0.0, 0 );
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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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G4DecayTable* table = new G4DecayTable;
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// create decay channels
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/*
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// The decays "mode[1]" and "mode[3]" produce the secondaries "anti_Li5" and "anti_He5",
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// respectively, which are not existing in Geant4: we therefore skip them for the time being
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// (similarly for hyperHe5, to keep the symmetry between particle and anti-particle).
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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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G4VDecayChannel** mode = new G4VDecayChannel*[4];
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// anti_lambda -> anti_proton + pi+ , with 50% probability of capturing the anti_proton
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mode[0] = new G4PhaseSpaceDecayChannel( "anti_hyperHe5", half_br_lambda_to_p_pim, 3,
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"anti_alpha", "anti_proton", "pi+" );
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mode[1] = new G4PhaseSpaceDecayChannel( "anti_hyperHe5", half_br_lambda_to_p_pim, 2,
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"anti_Li5", "pi+" );
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// anti_lambda -> anti_neutron + pi0 , with 50% probability of capturing the anti_neutron
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mode[2] = new G4PhaseSpaceDecayChannel( "anti_hyperHe5", half_br_lambda_to_n_piz, 3,
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"anti_alpha", "anti_neutron", "pi0" );
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mode[3] = new G4PhaseSpaceDecayChannel( "anti_hyperHe5", half_br_lambda_to_n_piz, 2,
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"anti_He5", "pi0" );
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for ( G4int index = 0; index < 4; ++index ) table->Insert( mode[index] );
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*/
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// Replacement decay for the time being
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const G4double br_lambda_to_p_pim = 0.639;
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const G4double br_lambda_to_n_piz = 0.358;
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G4VDecayChannel** mode = new G4VDecayChannel*[2];
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// anti_lambda -> anti_proton + pi+ , with 0% probability of capturing the anti_proton
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mode[0] = new G4PhaseSpaceDecayChannel( "anti_hyperHe5", br_lambda_to_p_pim, 3,
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"anti_alpha", "anti_proton", "pi+" );
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// anti_lambda -> anti_neutron + pi0 , with 0% probability of capturing the anti_neutron
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mode[1] = new G4PhaseSpaceDecayChannel( "anti_hyperHe5", br_lambda_to_n_piz, 3,
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"anti_alpha", "anti_neutron", "pi0" );
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for ( G4int index = 0; index < 2; ++index ) table->Insert( mode[index] );
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//---
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delete [] mode;
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anInstance->SetDecayTable( table );
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}
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theInstance = reinterpret_cast< G4AntiHyperHe5* >( anInstance );
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return theInstance;
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}
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G4AntiHyperHe5* G4AntiHyperHe5::AntiHyperHe5Definition() {
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return Definition();
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}
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G4AntiHyperHe5* G4AntiHyperHe5::AntiHyperHe5() {
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return Definition();
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}
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