Regular Article

Critical review of CIELO evaluations of n+ ²³⁵U, ²³⁸U using differential experiments

NAPC – Nuclear Data Section, International Atomic Energy Agency, Vienna 1400, Austria

^* e-mail: R.CapoteNoy@iaea.org

Received: 18 December 2017
Received in final form: 28 February 2018
Accepted: 14 May 2018
Published online: 14 November 2018

Abstract

Key reactions have been selected to compare JEFF-3.3 (CIELO 2) and IAEA CIELO (CIELO 1) evaluated nuclear data files for neutron induced reactions on ²³⁵U and ²³⁸U targets. IAEA CIELO evaluation uses reaction models to construct the evaluation prior, but strongly relied on differential data including all reaction cross sections fitted within the IAEA Neutron Standards project. The JEFF-3.3 evaluation relied on a mix of differential and integral data with strong contribution from nuclear reaction modelling. Differences in evaluations are discussed; a better reproduction of differential data for the IAEA CIELO evaluation is shown for key reaction channels.