Title: Covariances Obtained from an Evaluation of the Neutron Cross Section Standards
Authors: CARLSON A. D.BADIKOV S. A.ZHENPENG ChenGAI E.HALE G. M.HAMBSCH Franz-JosefHOFMANN H. M.KAWANO T.LARSON N. M.OH S. Y.PRONYAEV V. GSMITH D. L.TAGESEN S.VONACH H.
Citation: NUCLEAR DATA SHEETS vol. 109 no. 12 p. 2834-2839
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication Year: 2008
JRC N°: JRC46338
ISSN: 0090-3752
URI: http://www.sciencedirect.com
http://publications.jrc.ec.europa.eu/repository/handle/JRC46338
DOI: 10.1016/j.nds.2008.11.019
Type: Contributions to Conferences
Abstract: New measurements and an improved evaluation process were used to obtain a new evaluation of the neutron cross section standards. Efforts were made to include as much information as possible on the components of the data uncertainties that were then used to obtain the covariance matrices for the experimental data. Evaluations were produced from this process for the 6Li(n,t), 10B(n,a), 10B(n,a,gamma), 197Au(n,gamma), 235U(n,f), and 238U(n,f) standard cross sections as well as the non-standard 238U(n,gamma) and 239Pu(n,f) cross sections. There is a general increase in the cross sections for most of the new evaluations, by as much as about 5%, compared with the ENDF/B-VI results. Covariance data were obtained for the 6Li(n,t), 6Li(n,n), 10B(n,a), 10B(n,a1gamma), 10B(n,n), 197Au(n,gamma), 235U(n,f), 238U(n,f), 238U(n,gamma) and 239Pu(n,f) reactions. Also an independent R-Matrix evaluation was produced for the H(n,n) standard cross section however covariance data are not available for this reaction. The evaluations were used in the new ENDF/B-VII library.
JRC Institute:Institute for Reference Materials and Measurements

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.