BENCHMARK EXPERIMENT ON COPPER WITH D-T NEUTRONS FOR VERIFICATION OF NEUTRON-TRANSPORT AND RELATED NUCLEAR-DATA OF JENDL-3.1

A clean benchmark experiment on copper was performed with D-T neutrons at the Fusion Neutronics Source facility of the Japan Atomic Energy R esearch Institute. A pure copper slab 629 mm in diameter and 608 mm in depth was set at 200 mm from the D-T neutron source. Neutron spectra above a few keV and activation reaction rates such as Nb-93(n,2n)Nb-92 m, In-115(n,n')In-115m and Au-197(n,gamma)Au-198 were measured at the front surface of the copper slab and inside the copper slab (depths of 76, 228, 380 and 532 mm) using a spherical NE213 scintillation detect or (diameter 14 mm), two small proton recoil gas proportional counters and activation foils. The experimental analyses were performed using the two-dimensional transport code DOT3.5 and the continuous energy Mo nte Carlo code MCNP-4 with the cross-section sets based on the JENDL-3 .1 nuclear data library. The present benchmark experiment suggests tha t there are still problems in the nuclear data of copper in JENDL-3.1 and the self-shielding correction of the group constants for the DOT3. 5 calculation.