EPJ Web Conf.
Volume 281, 20235th International Workshop on Nuclear Data Covariances (CW2022)
|Number of page(s)||4|
|Published online||29 March 2023|
A proposed method for addressing large unphysical uncertainties in mubar
Nuclear Data Team, Group XCP-5, Los Alamos National Laboratory, Los Alamos NM, USA
* Corresponding author: email@example.com
Published online: 29 March 2023
Mubar uncertainties in Section MF 34 MT 2 of ENDF/B-VIII.0 data are sometimes too large. Physical limitations of the bounds of mubar limit the maximum uncertainty to be < 1.0 and usually ≪ 1.0. Two ad hoc methods are proposed to artificially constrain the randomly sampled values of mubar to allowable values. The application of NJOY’s mubar covariance matrix to the “sandwich rule” is also discussed and a consistent way to apply sensitivity coefficients is described. Mubar uncertainties for the Jezebel keff were found to be 156 pcm – a value comparable to other evaluated cross section uncertainties.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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