Evaluations of the Fast Neutron Cross Sections of58Ni,60Ni and28Si Including Complete Covariance Information

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.