G4AntiLambda.cc

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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 "G4AntiLambda.hh"
00040 #include "G4PhysicalConstants.hh"
00041 #include "G4SystemOfUnits.hh"
00042 #include "G4ParticleTable.hh"
00043 
00044 #include "G4PhaseSpaceDecayChannel.hh"
00045 #include "G4DecayTable.hh"
00046 
00047 // ######################################################################
00048 // ###                           AntiLambda                           ###
00049 // ######################################################################
00050 
00051 G4AntiLambda* G4AntiLambda::theInstance = 0;
00052 
00053 G4AntiLambda* G4AntiLambda::Definition()
00054 {
00055   if (theInstance !=0) return theInstance;
00056   const G4String name = "anti_lambda";
00057   // search in particle table]
00058   G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
00059   G4ParticleDefinition* anInstance = pTable->FindParticle(name);
00060   if (anInstance ==0)
00061   {
00062   // create particle
00063   //
00064   //    Arguments for constructor are as follows
00065   //               name             mass          width         charge
00066   //             2*spin           parity  C-conjugation
00067   //          2*Isospin       2*Isospin3       G-parity
00068   //               type    lepton number  baryon number   PDG encoding
00069   //             stable         lifetime    decay table
00070   //             shortlived      subType    anti_encoding
00071 
00072     anInstance = new G4ParticleDefinition(
00073                  name,    1.115683*GeV,  2.501e-12*MeV,         0.0, 
00074                     1,              +1,             0,          
00075                     0,               0,             0,             
00076              "baryon",               0,            -1,       -3122,
00077                 false,       0.2631*ns,          NULL,
00078                 false,       "lambda");
00079 
00080     // Magnetic Moment
00081     G4double mN = eplus*hbar_Planck/2./(proton_mass_c2 /c_squared);
00082     anInstance->SetPDGMagneticMoment( 0.613 * mN);
00083 
00084     //create Decay Table 
00085     G4DecayTable* table = new G4DecayTable();
00086     
00087     // create decay channels
00088     G4VDecayChannel** mode = new G4VDecayChannel*[2];
00089     // anti_lambda -> anti_proton + pi+
00090     mode[0] = new G4PhaseSpaceDecayChannel("anti_lambda",0.639,2,"anti_proton","pi+");
00091     // anti_lambda -> anti_neutron + pi0
00092     mode[1] = new G4PhaseSpaceDecayChannel("anti_lambda",0.358,2,"anti_neutron","pi0");
00093     
00094     for (G4int index=0; index <2; index++ ) table->Insert(mode[index]);  
00095     delete [] mode;
00096     
00097     anInstance->SetDecayTable(table);
00098   }
00099   theInstance = reinterpret_cast<G4AntiLambda*>(anInstance);
00100   return theInstance;
00101 }
00102 
00103 G4AntiLambda*  G4AntiLambda::AntiLambdaDefinition()
00104 {
00105   return Definition();
00106 }
00107 
00108 G4AntiLambda*  G4AntiLambda::AntiLambda()
00109 {
00110   return Definition();
00111 }
00112 
00113 

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