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 // ********************************************************************** 00036 // New impelemenataion as an utility class M.Asai, 26 July 2004 00037 // ---------------------------------------------------------------------- 00038 00039 #include "G4PionZero.hh" 00040 #include "G4SystemOfUnits.hh" 00041 #include "G4ParticleTable.hh" 00042 00043 00044 #include "G4PhaseSpaceDecayChannel.hh" 00045 #include "G4DalitzDecayChannel.hh" 00046 #include "G4DecayTable.hh" 00047 00048 // ###################################################################### 00049 // ### PIONZERO ### 00050 // ###################################################################### 00051 00052 G4PionZero* G4PionZero::theInstance = 0; 00053 00054 G4PionZero* G4PionZero::Definition() 00055 { 00056 if (theInstance !=0) return theInstance; 00057 const G4String name = "pi0"; 00058 // search in particle table] 00059 G4ParticleTable* pTable = G4ParticleTable::GetParticleTable(); 00060 G4ParticleDefinition* anInstance = 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 00073 anInstance = new G4ParticleDefinition( 00074 name, 0.1349766*GeV, 7.8e-06*MeV, 0.0, 00075 0, -1, +1, 00076 2, 0, -1, 00077 "meson", 0, 0, 111, 00078 false, 8.4e-8*ns, NULL, 00079 false, "pi", 111); 00080 00081 //create Decay Table 00082 G4DecayTable* table = new G4DecayTable(); 00083 00084 // create a decay channel 00085 G4VDecayChannel* mode; 00086 // pi0 -> gamma + gamma 00087 mode = new G4PhaseSpaceDecayChannel("pi0",0.988,2,"gamma","gamma"); 00088 table->Insert(mode); 00089 // pi0 -> gamma + e+ + e- 00090 mode = new G4DalitzDecayChannel("pi0",0.012,"e-","e+"); 00091 table->Insert(mode); 00092 00093 anInstance->SetDecayTable(table); 00094 } 00095 theInstance = reinterpret_cast<G4PionZero*>(anInstance); 00096 return theInstance; 00097 } 00098 00099 G4PionZero* G4PionZero::PionZeroDefinition() 00100 { 00101 return Definition(); 00102 } 00103 00104 G4PionZero* G4PionZero::PionZero() 00105 { 00106 return Definition(); 00107 } 00108