G4SigmaZero.cc

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//
// $Id: G4SigmaZero.cc 79357 2014-02-25 10:06:54Z gcosmo $
//
// 
// ----------------------------------------------------------------------
//      GEANT 4 class implementation file
//
//      History: first implementation, based on object model of
//      4th April 1996, G.Cosmo
// **********************************************************************
//  New impelemenataion as an utility class  M.Asai, 26 July 2004
// ----------------------------------------------------------------------

#include "G4SigmaZero.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleTable.hh"

#include "G4PhaseSpaceDecayChannel.hh"
#include "G4DecayTable.hh"

// ######################################################################
// ###                           SigmaZero                            ###
// ######################################################################

G4SigmaZero* G4SigmaZero::theInstance = 0;

G4SigmaZero* G4SigmaZero::Definition()
{
  if (theInstance !=0) return theInstance;
  const G4String name = "sigma0";
  // search in particle table]
  G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* anInstance = pTable->FindParticle(name);
  if (anInstance ==0)
  {
  // 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

    anInstance = new G4ParticleDefinition(
                 name,    1.192642*GeV,    8.9e-3*MeV,         0.0,
                    1,              +1,             0,
                    2,               0,             0,
             "baryon",               0,            +1,        3212,
                false,      7.4e-11*ns,          NULL,
                false,       "sigma");
   // Life time is given from width
   anInstance->SetPDGLifeTime( hbar_Planck/(anInstance->GetPDGWidth()) );

    //create Decay Table
    G4DecayTable* table = new G4DecayTable();
    
    // create decay channels
    // sigma0 -> lambda + gamma
    G4VDecayChannel* mode  = new G4PhaseSpaceDecayChannel("sigma0",1.000,2,"lambda","gamma");
    
    table->Insert(mode);
    
    anInstance->SetDecayTable(table);
  }
  theInstance = reinterpret_cast<G4SigmaZero*>(anInstance);
  return theInstance;
}

G4SigmaZero*  G4SigmaZero::SigmaZeroDefinition()
{
  return Definition();
}

G4SigmaZero*  G4SigmaZero::SigmaZero()
{
  return Definition();
}