Pu236(n,f) , Pu237(n,f) , and Pu238(n,f) cross sections deduced from (p,t) , (p,d) , and (p,p') surrogate reactions

Hughes, R. O.; Beausang, C. W.; Ross, T. J.; Burke, J. T.; Casperson, R. J.; Cooper, N.; Escher, J. E.; Gell, K.; Good, E.; Humby, P.; McCleskey, M.; Saastimoinen, A.; Tarlow, T. D.; Thompson, I. J.

doi:10.1103/PhysRevC.90.014304

Title: ${}^{236}{Pu} (n, f)$ , ${}^{237}{Pu} (n, f)$ , and ${}^{238}{Pu} (n, f)$ cross sections deduced from $(p, t)$ , $(p, d)$ , and $(p, p^{'})$ surrogate reactions

Journal Article · Tue Jul 01 00:00:00 EDT 2014 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.90.014304· OSTI ID:1229800

Hughes, R. O. ^[1]; Beausang, C. W. ^[1]; Ross, T. J. ^[1]; Burke, J. T. ^[2]; Casperson, R. J. ^[2]; Cooper, N. ^[3]; Escher, J. E. ^[2]; Gell, K. ^[1]; Good, E. ^[1]; Humby, P. ^[3]; McCleskey, M. ^[4]; Saastimoinen, A. ^[4]; Tarlow, T. D. ^[1]; Thompson, I. J. ^[2]

Univ. of Richmond, VA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Yale Univ., New Haven, CT (United States)
Texas A & M Univ., College Station, TX (United States)

The Pu²³⁶(n,f), Pu²³⁷(n,f) and Pu²³⁸(n,f) cross sections have been inferred by utilizing the surrogate ratio method. Targets of Pu²³⁹ and U²³⁵ were bombarded with 28.5-MeV protons, and the light ion recoils, as well as fission fragments, were detected using the STARS detector array at the K150 Cyclotron at the Texas A&M cyclotron facility. The (p, tf) reaction on Pu²³⁹ and U²³⁵ targets was used to deduce the σ (Pu²³⁶(n,f))/σ(U²³²(n,f)) ratio, and the Pu²³⁶(n,f) cross section was subsequently determined for En=0.5–7.5 MeV. Similarly, the (p,df) reaction on the same two targets was used to deduce the σ(Pu²³⁷(n,f))/σ(U²³³(n,f)) ratio, and the Pu²³⁷(n,f) cross section was extracted in the energy range En=0.5–7 MeV. The Pu²³⁸(n,f) cross section was also deduced by utilizing the (p,p') reaction channel on the same targets. There is good agreement with the recent ENDF/B-VII.1 evaluated cross section data for Pu²³⁸(n,f) in the range En=0.5–10.5 MeV and for Pu²³⁷(n,f) in the range En=0.5–7 MeV; however, the Pu²³⁶(n,f) cross section deduced in the present work is higher than the evaluation between 2 and 7 MeV.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC52-07NA27344

OSTI ID:: 1229800

Report Number(s):: LLNL-JRNL-647733; PRVCAN

Journal Information:: Physical Review C, Nuclear Physics, Vol. 90, Issue 1; ISSN 0556-2813

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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