Covariance Evaluation Methodology for Neutron Cross Sections

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We present the NNDC-BNL methodology for estimating neutron cross section covariances in thermal, resolved resonance, unresolved resonance and fast neutron regions. The three key elements of the methodology are Atlas of Neutron Resonances, nuclear reaction code EMPIRE, and the Bayesian code implementing Kalman filter concept. The covariance data processing, visualization and distribution capabilities are integral components of the NNDC methodology. We illustrate its application on examples including relatively detailed evaluation of covariances for two individual nuclei and massive production of simple covariance estimates for 307 materials. Certain peculiarities regarding evaluation of covariances for resolved resonances and the consistency between resonance ... continued below

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Herman,M.; Arcilla, R.; Mattoon, C.M.; Mughabghab, S.F.; Oblozinsky, P.; Pigni, M. et al. September 1, 2008.

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We present the NNDC-BNL methodology for estimating neutron cross section covariances in thermal, resolved resonance, unresolved resonance and fast neutron regions. The three key elements of the methodology are Atlas of Neutron Resonances, nuclear reaction code EMPIRE, and the Bayesian code implementing Kalman filter concept. The covariance data processing, visualization and distribution capabilities are integral components of the NNDC methodology. We illustrate its application on examples including relatively detailed evaluation of covariances for two individual nuclei and massive production of simple covariance estimates for 307 materials. Certain peculiarities regarding evaluation of covariances for resolved resonances and the consistency between resonance parameter uncertainties and thermal cross section uncertainties are also discussed.

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  • M3 Report prepared for GNEP, U.S. DOE Reactors Campaign; Brookhaven National Laboratory; 20080901 through 20080930

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  • Report No.: BNL--81623-2008
  • Grant Number: DE-AC02-98CH10886
  • DOI: 10.2172/928418 | External Link
  • Office of Scientific & Technical Information Report Number: 939948
  • Archival Resource Key: ark:/67531/metadc902567

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  • September 1, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 1, 2016, 2:29 p.m.

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Herman,M.; Arcilla, R.; Mattoon, C.M.; Mughabghab, S.F.; Oblozinsky, P.; Pigni, M. et al. Covariance Evaluation Methodology for Neutron Cross Sections, article, September 1, 2008; United States. (digital.library.unt.edu/ark:/67531/metadc902567/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.