Updating the 238U(n,2n), 238U(n,3n), 238U(n,4n) and 238U(n,elastic) ENDL Cross Sections

Abstract

Our previous 238 U(n, 2n) cross section evaluation (Ref. [1]) contains two significant problems: 1) the threshold region does not have the right shape and 2) the peak is not high enough. In this note, we outline how we arrived at an improved cross section and what other changes are needed to the entire 238 U(n, X) cross section set in ENDL99 to accomodate this fix. We also describe the processed data files we produced from this update.