G4SigmaPlus.cc

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//
// $Id$
//
// 
// ----------------------------------------------------------------------
//      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 "G4SigmaPlus.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleTable.hh"
 
#include "G4PhaseSpaceDecayChannel.hh"
#include "G4DecayTable.hh"
 
// ######################################################################
// ###                           SigmaPlus                            ###
// ######################################################################
 
G4SigmaPlus* G4SigmaPlus::theInstance = 0;
 
G4SigmaPlus* G4SigmaPlus::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,    1.18937*GeV, 8.209e-12*MeV,       eplus,
                    1,              +1,             0,
                    2,              +2,             0,
             "baryon",               0,            +1,        3222,
                false,      0.08018*ns,          NULL,
                false,       "sigma");
 
    // Magnetic Moment
    G4double mN = eplus*hbar_Planck/2./(proton_mass_c2 /c_squared);
    anInstance->SetPDGMagneticMoment( 2.458 * mN);
 
    //create Decay Table
    G4DecayTable* table = new G4DecayTable();
    
    // create decay channels
    G4VDecayChannel** mode = new G4VDecayChannel*[2];
    // sigma+ -> proton + pi0
    mode[0] = new G4PhaseSpaceDecayChannel("sigma+",0.516,2,"proton","pi0");
    // sigma+ -> neutron + pi+
    mode[1] = new G4PhaseSpaceDecayChannel("sigma+",0.483,2,"neutron","pi+");
    
    for (G4int index=0; index <2; index++ ) table->Insert(mode[index]);
    delete [] mode;
    
    anInstance->SetDecayTable(table);
  }
  theInstance = reinterpret_cast<G4SigmaPlus*>(anInstance);
  return theInstance;
}
 
G4SigmaPlus*  G4SigmaPlus::SigmaPlusDefinition()
{
  return Definition();
}
 
G4SigmaPlus*  G4SigmaPlus::SigmaPlus()
{
  return Definition();
}