Evaluations of the Fast Neutron Cross Sections of 58Ni, 60Ni and 28Si Including Complete Covariance InformationInstitut für Isotopenforschung und Kernphysik der Universität Wien, Boltzmanngasse 3, A-1090 Wien, Austria A simultaneous evaluation of all important neutron cross sections for each of the isotopes was performed in the incident neutron energy range from end of the resonance region to 20 MeV. The Bayesian least-squares code GLUCS combined the results of nuclear model calculations ("prior") with the complete existing experimental database to obtain the most accurate description of the cross sections and their covariances within our present knowledge ("posterior"). The results of the new evaluations agree with ENDF/B-VI and EFF-2 within the uncertainties of these evaluations. Most of the uncertainties of our evaluated cross sections, however, are considerably smaller than those of ENDF/B-VI and EFF-2. KEYWORDS: simultaneous evaluation, nickel 58, nickel 60, silicon 28, neutron cross section, complete covariances |
