KLOE calorimeter simulation with Virtual Monte Carlo

The calorimeter of KLOE at INFN-LNF is a high-sampling, lead/scintillating-fiber calorimeter primarily designed to detect photons with very high efficiency. During a KLOE study of kaon interactions in the apparatus walls, hints of a high efficiency for low energy neutrons (<; 20MeV) were observed and confirmed by the experiment simulation. A more systematic study, involving exposing the prototype on a dedicated neutron test beam at TSL, Uppsala and detailed simulations with Geant3 and Fluka concluded on a possible explanation for the increased efficiency, mainly due to increased neutron inelastic scattering on lead and the high sampling ratio. In this study we repeat the simulation using the Virtual Monte Carlo interface as a front-end to Geant3 and Geant4 and compare with existing simulation results and test beam data.