Abstract
Discovering unexplored high-spin states in neutron-rich nuclei can open up a new direction to study band structure and the associated shell structure in isospin-asymmetric many-body systems. However, experimental reach has so far been limited to neutron-deficient or stable nuclei which are preferentially produced in fusion reactions used in such studies. Here, we report the first -ray spectroscopy with fusion reactions using a reaccelerated rare-isotope beam of performed at the ReA3 facility of the National Superconducting Cyclotron Laboratory. Using particle and -ray coincidence techniques, three new higher-lying states around 6 MeV and five new -ray transitions were identified for , suggesting three independent band structures formed from different particle-hole configurations. The rotational-like band built on the state is established up to the tentatively assigned state. New results are compared to large-scale shell model calculations, confirming the validity of the effective interaction describing particle-hole excitations across the and shell gaps in the vicinity of doubly magic .
- Received 6 November 2020
- Accepted 27 April 2021
DOI:https://doi.org/10.1103/PhysRevC.103.L051302
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