Low-lying level structure of the neutron-unbound N=7 isotones

D. Votaw et al.
Phys. Rev. C 102, 014325 – Published 29 July 2020

Abstract

This article reports on results of an experimental search for ground state shell inversion in the neutron-unbound N=7 isotones He9 and Li10. Two different radioactive ion beams (Be11, Elab=44MeV/u and B12, Elab=45MeV/u) impinging on a beryllium target were used to directly and selectively populate unbound states of a given in the nuclides of interest. Be(Be11,He8+n) and Be(B12,He8+n) reactions populated unbound states in He9. Fragments and neutrons were detected in coincidence to reconstruct the decay energy of He9 using invariant mass spectroscopy. Similarly, Be(Be11,Li9+n) and Be(B12,Li9+n) reactions were used to populate unbound states in Li10, and the time-of-flight method was used to determine the relative velocity of the Li9 fragments and neutrons in coincidence. Various states in both He9 and Li10 were observed and characterized. The data indicate possible ground state shell inversion in both cases.

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  • Received 12 February 2020
  • Revised 2 May 2020
  • Accepted 17 July 2020

DOI:https://doi.org/10.1103/PhysRevC.102.014325

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 102, Iss. 1 — July 2020

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