Abstract
To provide high quality benchmark data for the integral test of evaluated nuclear data files such as JENDL-3, angular neutron flux spectra from lead slabs were measured by the time-of-flight method. The experimental assembly was set up in a pseudo-cylindrical slab shape of 630 mmin diameter. The thickness was 50.8, 203 and 406 mm. The angular flux spectra were obtained in the energy range of 0.08 to 15 MeV, and at 0, 12.2, 24.9, 41.8 and 66.8°. The analysis was performed by the Monte Carlo code MCNP. The calculation based on JENDL-3 agrees very well with the experiment except in the region between 5 and 11 MeV. A good agreement should be expected when the number of inelastic levels increases more than the present limit in JENDL-3 or bunched levels are used.
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