Abstract
This article reports on results of an experimental search for ground state shell inversion in the neutron-unbound isotones and . Two different radioactive ion beams (, /u and , /u) impinging on a beryllium target were used to directly and selectively populate unbound states of a given in the nuclides of interest. and reactions populated unbound states in . Fragments and neutrons were detected in coincidence to reconstruct the decay energy of using invariant mass spectroscopy. Similarly, and reactions were used to populate unbound states in , and the time-of-flight method was used to determine the relative velocity of the fragments and neutrons in coincidence. Various states in both and were observed and characterized. The data indicate possible ground state shell inversion in both cases.
4 More- Received 12 February 2020
- Revised 2 May 2020
- Accepted 17 July 2020
DOI:https://doi.org/10.1103/PhysRevC.102.014325
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