00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // $Id$ 00028 // 00029 // 00030 // ---------------------------------------------------------------------- 00031 // GEANT 4 class implementation file 00032 // 00033 // History: first implementation, based on object model of 00034 // 4th April 1996, G.Cosmo 00035 // H.Kurashige 7 July 1996 00036 // add neutron life time Oct 17 2000 00037 // ********************************************************************** 00038 // New impelemenataion as an utility class M.Asai, 26 July 2004 00039 // ---------------------------------------------------------------------- 00040 00041 #include "G4Neutron.hh" 00042 #include "G4PhysicalConstants.hh" 00043 #include "G4SystemOfUnits.hh" 00044 #include "G4ParticleTable.hh" 00045 00046 #include "G4NeutronBetaDecayChannel.hh" 00047 #include "G4DecayTable.hh" 00048 00049 // ###################################################################### 00050 // ### NEUTRON ### 00051 // ###################################################################### 00052 G4Neutron* G4Neutron::theInstance = 0; 00053 00054 G4Neutron* G4Neutron::Definition() 00055 { 00056 if (theInstance !=0) return theInstance; 00057 const G4String name = "neutron"; 00058 // search in particle table] 00059 G4ParticleTable* pTable = G4ParticleTable::GetParticleTable(); 00060 G4Ions* anInstance = reinterpret_cast<G4Ions*>(pTable->FindParticle(name)); 00061 if (anInstance ==0) 00062 { 00063 // create particle 00064 // 00065 // Arguments for constructor are as follows 00066 // name mass width charge 00067 // 2*spin parity C-conjugation 00068 // 2*Isospin 2*Isospin3 G-parity 00069 // type lepton number baryon number PDG encoding 00070 // stable lifetime decay table 00071 // shortlived subType anti_encoding 00072 // use constants in CLHEP 00073 // static const double neutron_mass_c2 = 939.56563 * MeV; 00074 00075 anInstance = new G4Ions( 00076 name, neutron_mass_c2, 7.467e-28*GeV, 0.0, 00077 1, +1, 0, 00078 1, -1, 0, 00079 "baryon", 0, +1, 2112, 00080 false, 885.7*second, NULL, 00081 false, "nucleon", 0, 00082 0.0 00083 ); 00084 // Magnetic Moment 00085 G4double mN = eplus*hbar_Planck/2./(proton_mass_c2 /c_squared); 00086 anInstance->SetPDGMagneticMoment( -1.9130427 * mN); 00087 //create Decay Table 00088 G4DecayTable* table = new G4DecayTable(); 00089 // create a decay channel 00090 G4VDecayChannel* mode = new G4NeutronBetaDecayChannel("neutron",1.00); 00091 table->Insert(mode); 00092 anInstance->SetDecayTable(table); 00093 00094 } 00095 theInstance = reinterpret_cast<G4Neutron*>(anInstance); 00096 return theInstance; 00097 } 00098 00099 G4Neutron* G4Neutron::NeutronDefinition() 00100 { 00101 return Definition(); 00102 } 00103 00104 G4Neutron* G4Neutron::Neutron() 00105 { 00106 return Definition(); 00107 } 00108