Short comments to 56Fe of FENDL/MG-2.0

Dr. Kodeli pointed out a large discrepancy between neutron spectra below 1.5 keV calculated by MCNP and ANISN with the FENDL-2 library for an iron sphere benchmark, which consisted of an iron sphere of 10 cm in radius with 14 MeV neutron source in the center. Reasons of the discrepancy were investigated in detail. The benchmark calculations with FENDL-1, FENDL-2 and EFF-3.1 by ANISN and MCNP suggested that FENDL/MG-2.0 56Fe data have some problems. It was identified that reasons of the discrepancy are the LIST data of the first neutron energy of the FILE6 in FENDL/E-2.0 56Fe, through the detail check of the original libraries of 56Fe of FENDL-1, FENDL-2 and EFF-3.1. The FENDL/MG-2.0 27Al data also have the same problem, though the influence is small. (author)