Abstract
Level structures in and adjacent nuclei were studied with Gammasphere using the reaction of a -MeV beam on a 55-mg/cm thick target. High-spin level schemes were deduced from singly- and doubly-gated prompt coincidence events. Levels populated in the decay of isomers were studied in singly- and doubly-gated delayed coincidences. Spin and parity assignments were deduced from angular correlations of rays observed in both nuclei, leading to firm positive-parity yrast assignments up through in . The observed levels for up to MeV compare well with shell-model calculations available in the literature. Calculations performed in a limited basis exhibit reasonable agreement for the , , and levels in . However, theoretical descriptions that include the newly identified negative-parity levels in require a much larger basis, necessarily including neutrons, as well as improved interactions leading to negative-parity levels.
3 More- Received 28 May 2010
DOI:https://doi.org/10.1103/PhysRevC.82.044305
©2010 American Physical Society