Observation of T=3/2 isobaric analog states in Be9 using p+Li8 resonance scattering

C. Hunt, G. V. Rogachev, S. Almaraz-Calderon, A. Aprahamian, M. Avila, L. T. Baby, B. Bucher, V. Z. Goldberg, E. D. Johnson, K. W. Kemper, A. N. Kuchera, W. P. Tan, and I. Wiedenhöver
Phys. Rev. C 102, 014615 – Published 20 July 2020

Abstract

Background: Resonance scattering has been extensively used to study the structure of exotic, neutron-deficient nuclei. Extension of the resonance scattering technique to neutron-rich nuclei was suggested more than 20 years ago. This development is based on the isospin conservation law. In spite of broad field of the application, it has never gained a wide-spread acceptance.

Purpose: To benchmark the experimental approach to study the structure of exotic neutron-rich nuclei through resonance scattering on a proton target.

Method: The excitation function for p+Li8 resonance scattering is measured using a thick target by recording coincidence between light and heavy recoils, populating T=3/2 isobaric analog states (IAS) in Be9.

Results: A good fit of the Li8(p,p)Li8 resonance elastic scattering excitation function was obtained using previously tentatively known 5/2T=3/2 state at 18.65 MeV in Be9 and a new broad T=3/2s-wave state—the 5/2+ at 18.5 MeV. These results fit the expected isomirror properties for the T=3/2A=9 isoquartet.

Conclusions: Our analysis confirmed isospin as a good quantum number for the investigated highly excited T=3/2 states and demonstrated that studying the structure of neutron-rich exotic nuclei through IAS is a promising approach.

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  • Received 21 May 2020
  • Accepted 1 July 2020

DOI:https://doi.org/10.1103/PhysRevC.102.014615

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

C. Hunt1,2, G. V. Rogachev1,2,3,*, S. Almaraz-Calderon4, A. Aprahamian5, M. Avila6, L. T. Baby4, B. Bucher7, V. Z. Goldberg2, E. D. Johnson4, K. W. Kemper4, A. N. Kuchera8, W. P. Tan5, and I. Wiedenhöver4

  • 1Department of Physics and Astronomy, Texas A&M University, College Station 77843, Texas, USA
  • 2Cyclotron Institute, Texas A&M University, College Station 77843, Texas, USA
  • 3Nuclear Solutions Institute, Texas A&M University, College Station 77843, Texas, USA
  • 4Department of Physics, Florida State University, Tallahasee 32306, Florida, USA
  • 5Department of Physics, University of Notre Dame, Notre Dame 46556, Indiana, USA
  • 6Argonne National Laboratory, Lemont 60439, Illinois, USA
  • 7Idaho National Laboratory, Idaho Falls 83415, Idaho, USA
  • 8Department of Physics, Davidson College, Davidson 28035, North Carolina, USA

  • *rogachev@tamu.edu

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Vol. 102, Iss. 1 — July 2020

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