MEASUREMENT AND ANALYSIS OF NEUTRON SPECTRA FROM CHROMIUM SLAB FOR 14MeV NEUTRON SOURCE
Nuclear Engineering Research Laboratory, University of Tokyo
Tokai-mura, Naka-gun, Ibaraki-ken 319-11, Japan
Akito Takahashi and Junichi Yamamoto
Department of Nuclear Engineering, Osaka University
Suita-shi, Osaka-fu 565, Japan
Neutron energy spectra scattered by a chromium slab were measured with a 14 MeV neutron source in order to assess the accuracy of chromium cross sections. The measurement was performed by the time-of-flight method for 6 scattering angles. The neutron energy spectra between 2 and 15 MeV were obtained and compared with calculated spectra. The calculation was carried out with a continuous energy Monte Carlo code MCNP using JENDL-3PR1 and ENDF/B-IV cross section libraries. Generally the spectra calculated using JENDL-3PR1 showed good agreement with the measurement, but the result suggested the cross sections and secondary angular distributions of elastic and inelastic scattering in JENDL-3PR1 should be changed for better agreement.
KEYWORDS: chromium, neutron spectra, 14 MeV neutron source, cross section, JENDL-3PR1, ENDF/B-IV, time-of-flight, Monte Carlo