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239Pu(n,2n)238Pu cross section deduced using a combination of experiment and theory

L. A. Bernstein, J. A. Becker, P. E. Garrett, W. Younes, D. P. McNabb, D. E. Archer, C. A. McGrath, H. Chen, W. E. Ormand, M. A. Stoyer, R. O. Nelson, M. B. Chadwick, G. D. Johns, W. S. Wilburn, M. Devlin, D. M. Drake, and P. G. Young
Phys. Rev. C 65, 021601(R) – Published 9 January 2002
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Abstract

The 239Pu(n,2n)238Pu cross section has been deduced using a combination of measured partial γ-ray cross sections and enhanced Hauser-Feshbach reaction modeling from threshold to En<~20MeV. Eight 239Pu(n,2nγ)238Pu partial γ-ray cross sections were measured using the GEANIE spectrometer, the time-of-flight technique, and energetic neutrons produced at the LANSCE/WNR facility. The (n,2n) cross section was obtained by multiplying the sum of observed noncoincident partial γ-ray cross sections by the calculated ratio of the (n,2n) cross section divided by the sum of the same partial γ-ray cross sections. A comparison between the data and model calculations indicates potential deficiencies in the modeling of the γ-ray cascade.

  • Received 23 July 2001

DOI:https://doi.org/10.1103/PhysRevC.65.021601

©2002 American Physical Society

Authors & Affiliations

L. A. Bernstein, J. A. Becker, P. E. Garrett, W. Younes, D. P. McNabb, D. E. Archer, C. A. McGrath*, H. Chen, W. E. Ormand, and M. A. Stoyer

  • Lawrence Livermore National Laboratory, Livermore, California 94551

R. O. Nelson, M. B. Chadwick, G. D. Johns, W. S. Wilburn, M. Devlin, D. M. Drake, and P. G. Young

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545

  • *Present address: Idaho National Engineering and Environmental Laboratory, P.O. Box 1625, Idaho Falls, ID 83415.

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Vol. 65, Iss. 2 — February 2002

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