Evaluation of Covariance Data for Chromium, Iron and Nickel Contained in JENDL-3.2.

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  • OH Soo Youl
    Nuclear Data Evaluation Laboratory, Korea Atomic Energy Research Institute
  • SHIBATA Keiichi
    Nuclear Data Center, Japan Atomic Energy Research Institute

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  • Evaluation of Covariance Data for Chrom

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An evaluation has been made for the covariances of neutron cross sections of 52Cr, 56Fe, 58Ni and 60Ni contained in JENDL-3.2. Reactions considered were the threshold reactions such as (n, 2n), (n, nα), (n, np), (n, p), (n, d), (n, t) and (n, α), the radiative capture reaction above the resonance region, and the inelastic scattering to discrete and continuum levels. Evaluation guidelines and procedures were established during the work.<BR>A generalized least-squares fitting code GMA was used in estimating covariances for reactions of which JENDL-3.2 cross sections had been evaluated by taking account of many measured data. For cross sections that had been evaluated by nuclear reaction model calculations, the KALMAN code, which yields covariances of cross sections and of associated model parameters on the basis of the Bayesian statistics, was used in conjunction with reaction model codes EGNASH and CASTHY.<BR>The evaluated uncertainties of a few percent to 30% in the cross sections look reasonable, and the correlation matrices show understandable trends. Even though there is no strict way to confirm the validity of the evaluated covariances, tools and procedures adopted in the present work are appropriate for producing covariance files based on JENDL-3.2. The covariances obtained will be compiled into JENDL in the near future. Meanwhile, new sets of optical model and level density parameters were proposed as one of byproducts obtained from the KALMAN calculations.

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