Abstract
In this article we report on the first spectroscopic information on and the observation of an isomer in this nucleus with . It is located in close proximity to for , where the orbit is completely filled. The possible origin of the isomeric state is a coupling configuration, resulting in a or spin-parity. This is likely caused by an inversion of the and orbitals at . The existence of such an isomer far from stability is discussed extensively in the context of shell-model calculations and compared to results from mean-field calculations performed using a deformed Woods-Saxon potential. Both approaches suggest the observation of a single-particle excitation mode at an extreme neutron number.
- Received 9 September 2015
- Revised 25 November 2015
DOI:https://doi.org/10.1103/PhysRevC.93.014316
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