Pu236(n,f), Pu237(n,f), and Pu238(n,f) cross sections deduced from (p,t), (p,d), and (p,p) surrogate reactions

R. O. Hughes, C. W. Beausang, T. J. Ross, J. T. Harke, R. J. Casperson, N. Cooper, J. E. Escher, K. Gell, E. Good, P. Humby, M. McCleskey, A. Saastimoinen, T. D. Tarlow, and I. J. Thompson
Phys. Rev. C 90, 014304 – Published 10 July 2014

Abstract

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 (ptf) 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=0.57.5 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=0.57 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=0.510.5 MeV and for Pu237(n,f) in the range En=0.57 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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  • Received 28 March 2014
  • Revised 28 May 2014

DOI:https://doi.org/10.1103/PhysRevC.90.014304

©2014 American Physical Society

Authors & Affiliations

R. O. Hughes1,*, C. W. Beausang1, T. J. Ross1,†, J. T. Harke2, R. J. Casperson2, N. Cooper3, J. E. Escher2, K. Gell1, E. Good1, P. Humby3,‡, M. McCleskey4, A. Saastimoinen4, T. D. Tarlow1, and I. J. Thompson2

  • 1Department of Physics, University of Richmond, 28 Westhampton Way, Richmond, Virginia 23173, USA
  • 2Lawrence Livermore National Laboratory, Livermore, California 94551, USA
  • 3Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511, USA
  • 4Cyclotron Institute, Texas A&M University, College Station, Texas, USA

  • *Present address: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
  • Present address: Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, USA.
  • Present address: Department of Physics, University of Richmond, 28 Westhampton Way, Richmond, Virginia 23173, USA.

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Vol. 90, Iss. 1 — July 2014

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