235U elastic cross-section adjustment in criticality benchmarks - Comparison between JENDL-4.0 and ENDF/-VII.1

The results obtained show that: the 235U elastic cross-sections taken from JENDL-4.0 requires an adjustment which can reach 6% in 0-100 keV, 4.5% in 100 keV-625 keV and 2.5% in 625 keV-0.5 MeV, while those from ENDF/B-VII.1 needs an adjustment which can reach 5% in 0-100 keV, 3% in 100 keV-625 keV and 1% in 625 keV-0.5 MeV interval. The adjusted cross-section in the two evaluations ameliorates the posterior calculated keff with respect to the experimental keff. Also the posterior covariance matrix decreases the nuclear uncertainty of the adjusted keff.