Abstract
The structure of was studied by a one-neutron knockout reaction from a beam at 98.5 MeV/u incident on a target. The prompt rays following the de-excitation of were detected using the GRETINA -ray tracking array while the reaction residues were identified on an event-by-event basis in the focal plane of the S800 spectrometer at the National Superconducting Cyclotron Laboratory. The presently derived spectroscopic factor values, , for the and states, corresponding to a neutron removal from the and orbitals, agree with shell model calculations and point to a strong shell closure. Three states arising from the more bound orbital are proposed, one of which is unbound by about 930 keV. The sensitivity of this experiment has also confirmed a weak population of and final states, which originate from a higher-order process. This mechanism may also have populated, to some fraction, the and negative-parity states, which hinders a determination of the values for knockout from the normally unoccupied and orbits.
- Received 11 March 2020
- Revised 3 June 2020
- Accepted 29 July 2020
DOI:https://doi.org/10.1103/PhysRevC.102.024321
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