Abstract
The structure was investigated in a high-statistics -decay experiment of using the GRIFFIN spectrometer at TRIUMF-ISAC through , , , and spectroscopy. No evidence was found for the recently reported 639-keV level suggested as evidence for low-energy shape coexistence in . Large-scale shell model calculations performed in place the level in at 2 MeV. The new experimental evidence combined with shell model predictions indicate that low-energy shape coexistence is not present in .
- Received 19 June 2020
- Revised 19 August 2020
- Accepted 18 September 2020
DOI:https://doi.org/10.1103/PhysRevLett.125.172501
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