Gabriele Cosmo
125 lines
6.0 KiB
C++
125 lines
6.0 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
// Author: 2021 Alberto Ribon
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
#include "G4HyperAlpha.hh"
|
|
#include "G4PhysicalConstants.hh"
|
|
#include "G4SystemOfUnits.hh"
|
|
#include "G4ParticleTable.hh"
|
|
|
|
#include "G4PhaseSpaceDecayChannel.hh"
|
|
#include "G4DecayTable.hh"
|
|
|
|
// ######################################################################
|
|
// ### HYPERALPHA ###
|
|
// ######################################################################
|
|
|
|
G4HyperAlpha* G4HyperAlpha::theInstance = nullptr;
|
|
|
|
|
|
G4HyperAlpha* G4HyperAlpha::Definition() {
|
|
if ( theInstance != nullptr ) return theInstance;
|
|
const G4String name = "hyperalpha";
|
|
// search in particle table
|
|
G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
|
|
G4Ions* anInstance = reinterpret_cast< G4Ions* >( pTable->FindParticle( name ) );
|
|
if ( anInstance == nullptr ) {
|
|
// create particle
|
|
//
|
|
// Arguments for constructor are as follows
|
|
// name mass width charge
|
|
// 2*spin parity C-conjugation
|
|
// 2*Isospin 2*Isospin3 G-parity
|
|
// type lepton number baryon number PDG encoding
|
|
// stable lifetime decay table
|
|
// shortlived subType anti_encoding
|
|
// excitation
|
|
anInstance = new G4Ions( name, 3921.87*MeV, 2.501e-12*MeV, +2.0*eplus,
|
|
0, +1, 0,
|
|
0, 0, 0,
|
|
"nucleus", 0, +4, 1010020040,
|
|
false, 0.2631*ns, nullptr,
|
|
false, "static", -1010020040,
|
|
0.0, 0 );
|
|
// Magnetic Moment
|
|
G4double mN = eplus*hbar_Planck/2.0/(proton_mass_c2 /c_squared);
|
|
anInstance->SetPDGMagneticMoment( 2.97896248 * mN );
|
|
|
|
// create Decay Table
|
|
G4DecayTable* table = new G4DecayTable;
|
|
// create decay channels
|
|
/*
|
|
// The decay "mode[1]" produces the secondary "Li4" whose corresponding anti-particle
|
|
// is not existing in Geant4: we therefore skip it for the time being, to keep the
|
|
// symmetry with the decays of anti_hyperalpha.
|
|
const G4double half_br_lambda_to_p_pim = 0.5*0.639;
|
|
const G4double half_br_lambda_to_n_piz = 0.5*0.358;
|
|
G4VDecayChannel** mode = new G4VDecayChannel*[4];
|
|
// lambda -> proton + pi- , with 50% probability of capturing the proton
|
|
mode[0] = new G4PhaseSpaceDecayChannel( "hyperalpha", half_br_lambda_to_p_pim, 3,
|
|
"He3", "proton", "pi-" );
|
|
mode[1] = new G4PhaseSpaceDecayChannel( "hyperalpha", half_br_lambda_to_p_pim, 2,
|
|
"Li4", "pi-" );
|
|
// lambda -> neutron + pi0 , with 50% probability of capturing the neutron
|
|
mode[2] = new G4PhaseSpaceDecayChannel( "hyperalpha", half_br_lambda_to_n_piz, 3,
|
|
"He3", "neutron", "pi0" );
|
|
mode[3] = new G4PhaseSpaceDecayChannel( "hyperalpha", half_br_lambda_to_n_piz, 2,
|
|
"alpha", "pi0" );
|
|
for ( G4int index = 0; index < 4; ++index ) table->Insert( mode[index] );
|
|
*/
|
|
// Replacement decay for the time being
|
|
const G4double br_lambda_to_p_pim = 0.639;
|
|
const G4double half_br_lambda_to_n_piz = 0.5*0.358;
|
|
G4VDecayChannel** mode = new G4VDecayChannel*[3];
|
|
// lambda -> proton + pi- , with 0% probability of capturing the proton
|
|
mode[0] = new G4PhaseSpaceDecayChannel( "hyperalpha", br_lambda_to_p_pim, 3,
|
|
"He3", "proton", "pi-" );
|
|
// lambda -> neutron + pi0 , with 50% probability of capturing the neutron
|
|
mode[1] = new G4PhaseSpaceDecayChannel( "hyperalpha", half_br_lambda_to_n_piz, 3,
|
|
"He3", "neutron", "pi0" );
|
|
mode[2] = new G4PhaseSpaceDecayChannel( "hyperalpha", half_br_lambda_to_n_piz, 2,
|
|
"alpha", "pi0" );
|
|
for ( G4int index = 0; index < 3; ++index ) table->Insert( mode[index] );
|
|
//---
|
|
delete [] mode;
|
|
anInstance->SetDecayTable( table );
|
|
}
|
|
theInstance = reinterpret_cast< G4HyperAlpha* >( anInstance );
|
|
return theInstance;
|
|
}
|
|
|
|
|
|
G4HyperAlpha* G4HyperAlpha::HyperAlphaDefinition() {
|
|
return Definition();
|
|
}
|
|
|
|
|
|
G4HyperAlpha* G4HyperAlpha::HyperAlpha() {
|
|
return Definition();
|
|
}
|