G4SigmaMinus.cc

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// 
// ----------------------------------------------------------------------
//      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 "G4SigmaMinus.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleTable.hh"

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

// ######################################################################
// ###                           SigmaMinus                           ###
// ######################################################################

G4SigmaMinus* G4SigmaMinus::theInstance = 0;

G4SigmaMinus* G4SigmaMinus::Definition()
{
  if (theInstance !=0) return theInstance;
  const G4String name = "sigma-";
  // 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,    1.197449*GeV,  4.45e-12*MeV,    -1*eplus,
                    1,              +1,             0,
                    2,              -2,             0,
             "baryon",               0,            +1,        3112,
                false,       0.1479*ns,          NULL,
                false,       "sigma");
 
    // Magnetic Moment
    G4double mN = eplus*hbar_Planck/2./(proton_mass_c2 /c_squared);
    anInstance->SetPDGMagneticMoment( -1.160 * mN);
 
    //create Decay Table 
    G4DecayTable* table = new G4DecayTable();
    
    // create decay channels
    G4VDecayChannel** mode = new G4VDecayChannel*[1];
    // sigma- -> neutron + pi-
    mode[0] = new G4PhaseSpaceDecayChannel("sigma-",1.00,2,"neutron","pi-");
    
    for (G4int index=0; index <1; index++ ) table->Insert(mode[index]);
    delete [] mode;
    
    anInstance->SetDecayTable(table);
  }
  theInstance = reinterpret_cast<G4SigmaMinus*>(anInstance);
  return theInstance;
}

G4SigmaMinus*  G4SigmaMinus::SigmaMinusDefinition()
{ 
  return Definition();
}

G4SigmaMinus*  G4SigmaMinus::SigmaMinus()
{ 
  return Definition();
}