A new 181Ta neutron resolved resonance region evaluation

D. P. Barry; M. T. Pigni; J. M. Brown; A. M. Lewis; T. H. Trumbull; K. H. Guber; B. J. McDermott; R. C. Block; Y. Danon

doi:10.1016/j.anucene.2024.110778

A new ¹⁸¹Ta neutron resolved resonance region evaluation

D. P. Barry, M. T. Pigni, J. M. Brown, A. M. Lewis, T. H. Trumbull, K. H. Guber, B. J. McDermott, R. C. Block, Y. Danon

Nuclear Data

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

A new ¹⁸¹Ta neutron resolved resonance region evaluation has been performed from the thermal energy range up to approximately 2.5 keV. The R-matrix SAMMY code was used with the Reich–Moore approximation to evaluate resonance parameters from several experimental data sets. A Monte Carlo approach was used for resonance spin assignments and generating 59 small fictitious resonance levels which were shown to improve the cumulative level, Porter-Thomas, and Wigner distributions as compared to theoretical predictions. Covariance information was also generated for the entire resolved resonance region. The positive impact of the new evaluation was validated through benchmark calculations which were sensitive to the ¹⁸¹Ta cross section and showed improvement in the reactivity bias for several benchmark cases.

Original language	English
Article number	110778
Journal	Annals of Nuclear Energy
Volume	208
DOIs	https://doi.org/10.1016/j.anucene.2024.110778
State	Published - Dec 1 2024

Funding

This manuscript has been authored by the Naval Nuclear Laboratory, operated by Fluor Marine Propulsion, LLC under Contract No. 89233018CNR000004 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, world-wide license to publish, distribute, translate, duplicate, exhibit, and perform the published form of this manuscript, or allow others to do so, for United States Government purposes. In addition, this work was supported by the US Department of Energy (DOE), Nuclear Criticality Safety Program (NCSP) funded and managed by the National Nuclear Security Administration (NNSA) for DOE, United States of America.

Keywords

Evaluation
Neutron
Resolved
Resonance
Tantalum

Access to Document

10.1016/j.anucene.2024.110778

Cite this

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title = "A new 181Ta neutron resolved resonance region evaluation",

abstract = "A new 181Ta neutron resolved resonance region evaluation has been performed from the thermal energy range up to approximately 2.5 keV. The R-matrix SAMMY code was used with the Reich–Moore approximation to evaluate resonance parameters from several experimental data sets. A Monte Carlo approach was used for resonance spin assignments and generating 59 small fictitious resonance levels which were shown to improve the cumulative level, Porter-Thomas, and Wigner distributions as compared to theoretical predictions. Covariance information was also generated for the entire resolved resonance region. The positive impact of the new evaluation was validated through benchmark calculations which were sensitive to the 181Ta cross section and showed improvement in the reactivity bias for several benchmark cases.",

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AU - Barry, D. P.

AU - Pigni, M. T.

AU - Brown, J. M.

AU - Lewis, A. M.

AU - Trumbull, T. H.

AU - Guber, K. H.

AU - McDermott, B. J.

AU - Block, R. C.

AU - Danon, Y.

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AB - A new 181Ta neutron resolved resonance region evaluation has been performed from the thermal energy range up to approximately 2.5 keV. The R-matrix SAMMY code was used with the Reich–Moore approximation to evaluate resonance parameters from several experimental data sets. A Monte Carlo approach was used for resonance spin assignments and generating 59 small fictitious resonance levels which were shown to improve the cumulative level, Porter-Thomas, and Wigner distributions as compared to theoretical predictions. Covariance information was also generated for the entire resolved resonance region. The positive impact of the new evaluation was validated through benchmark calculations which were sensitive to the 181Ta cross section and showed improvement in the reactivity bias for several benchmark cases.

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