Investigation of discrete states and quasidiscrete structures observed in Sm150 and Sm152 using the (p,tγ) reaction

P. Humby, A. Simon, C. W. Beausang, J. M. Allmond, J. T. Harke, R. J. Casperson, R. Chyzh, M. Dag, K. Gell, R. O. Hughes, J. Koglin, E. McCleskey, M. McCleskey, S. Ota, T. J. Ross, A. Saastamoinen, T. Tarlow, and G. Vyas
Phys. Rev. C 94, 064314 – Published 14 December 2016

Abstract

New levels and γ-ray transitions were identified in Sm150,152 utilizing the (p,t) reaction and particle-γ coincidence data. A large, peak-like structure observed between 2.3–3.0 MeV in excitation energy in the triton energy spectra was also investigated. The orbital angular-momentum transfer was probed by comparing the experimental angular distributions of the outgoing tritons to calculated distorted wave Born approximation curves. The angular distributions of the outgoing tritons populating the peak-like structure are remarkably similar in the two reactions and are significantly different from the angular distributions associated with the nearby continuum region. Relative partial cross sections for the observed levels, angle averaged between 34 and 58 degrees, were measured. In Sm150, 39(4)% of the strength of the peak-like structure could be accounted for by the observed discrete states. This compares with a value of 93(15)% for Sm152.

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  • Received 19 September 2016

DOI:https://doi.org/10.1103/PhysRevC.94.064314

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

P. Humby1,2, A. Simon1,3, C. W. Beausang1, J. M. Allmond4, J. T. Harke5, R. J. Casperson5, R. Chyzh6, M. Dag6, K. Gell1, R. O. Hughes5, J. Koglin5, E. McCleskey6, M. McCleskey6, S. Ota5, T. J. Ross7, A. Saastamoinen6, T. Tarlow1, and G. Vyas1

  • 1Department of Physics, University of Richmond, Richmond, Virginia 23171, USA
  • 2Department of Physics, University of Surrey, Surrey, GU27XH, United Kingdom
  • 3Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
  • 4Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 5Lawrence Livermore National Laboratory, Livermore, California 94551, USA
  • 6Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
  • 7Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, USA

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Issue

Vol. 94, Iss. 6 — December 2016

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