Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/particles/hadrons/barions/src/G4Neutron.cc

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  1 //
  2 // ********************************************************************
  3 // * License and Disclaimer                                           *
  4 // *                                                                  *
  5 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
  6 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
  7 // * conditions of the Geant4 Software License,  included in the file *
  8 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
  9 // * include a list of copyright holders.                             *
 10 // *                                                                  *
 11 // * Neither the authors of this software system, nor their employing *
 12 // * institutes,nor the agencies providing financial support for this *
 13 // * work  make  any representation or  warranty, express or implied, *
 14 // * regarding  this  software system or assume any liability for its *
 15 // * use.  Please see the license in the file  LICENSE  and URL above *
 16 // * for the full disclaimer and the limitation of liability.         *
 17 // *                                                                  *
 18 // * This  code  implementation is the result of  the  scientific and *
 19 // * technical work of the GEANT4 collaboration.                      *
 20 // * By using,  copying,  modifying or  distributing the software (or *
 21 // * any work based  on the software)  you  agree  to acknowledge its *
 22 // * use  in  resulting  scientific  publications,  and indicate your *
 23 // * acceptance of all terms of the Geant4 Software license.          *
 24 // ********************************************************************
 25 //
 26 // ----------------------------------------------------------------------
 27 //      GEANT 4 class implementation file
 28 //
 29 //      History: first implementation, based on object model of
 30 //      4th April 1996, G.Cosmo
 31 //                          H.Kurashige 7 July 1996
 32 //      add neutron life time    Oct 17 2000
 33 // **********************************************************************
 34 //  New impelemenataion as an utility class  M.Asai, 26 July 2004
 35 // ----------------------------------------------------------------------
 36 
 37 #include "G4Neutron.hh"
 38 
 39 #include "G4DecayTable.hh"
 40 #include "G4NeutronBetaDecayChannel.hh"
 41 #include "G4ParticleTable.hh"
 42 #include "G4PhysicalConstants.hh"
 43 #include "G4String.hh"
 44 #include "G4SystemOfUnits.hh"
 45 #include "G4Types.hh"
 46 #include "G4VDecayChannel.hh"
 47 
 48 G4Neutron* G4Neutron::theInstance = nullptr;
 49 
 50 G4Neutron* G4Neutron::Definition()
 51 {
 52   if (theInstance != nullptr) return theInstance;
 53   const G4String name = "neutron";
 54   // search in particle table]
 55   G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
 56   auto anInstance = static_cast<G4Ions*>(pTable->FindParticle(name));
 57   if (anInstance == nullptr) {
 58     // create particle
 59     //
 60     //    Arguments for constructor are as follows
 61     //               name             mass          width         charge
 62     //             2*spin           parity  C-conjugation
 63     //          2*Isospin       2*Isospin3       G-parity
 64     //               type    lepton number  baryon number   PDG encoding
 65     //             stable         lifetime    decay table
 66     //             shortlived      subType    anti_encoding
 67     // use constants in CLHEP
 68     // static const double  neutron_mass_c2 = 939.56563 * MeV;
 69 
 70     // clang-format off
 71     anInstance = new G4Ions(
 72                  name, neutron_mass_c2, 7.478e-28*GeV,         0.0, 
 73         1,              +1,             0,          
 74         1,              -1,             0,             
 75        "baryon",               0,            +1,        2112,
 76     false,    880.2*second,          nullptr,
 77     false,       "nucleon",         -2112,
 78      0.0,                0 
 79               );
 80     // clang-format on
 81 
 82     // Magnetic Moment
 83     G4double mN = eplus * hbar_Planck / 2. / (proton_mass_c2 / c_squared);
 84     anInstance->SetPDGMagneticMoment(-1.9130427 * mN);
 85     // create Decay Table
 86     auto table = new G4DecayTable();
 87     // create a decay channel
 88     G4VDecayChannel* mode = new G4NeutronBetaDecayChannel("neutron", 1.00);
 89     table->Insert(mode);
 90     anInstance->SetDecayTable(table);
 91   }
 92   theInstance = static_cast<G4Neutron*>(anInstance);
 93   return theInstance;
 94 }
 95 
 96 G4Neutron* G4Neutron::NeutronDefinition()
 97 {
 98   return Definition();
 99 }
100 
101 G4Neutron* G4Neutron::Neutron()
102 {
103   return Definition();
104 }
105