Study of <sup>68</sup>Co low-energy structure via β decay including fast-timing measurements
ORAL
Abstract
In neutron-rich nuclei near N = 40, the large energy separation of the νpf shell and the νg9/2 single-particle state is responsible for a subshell closure that has long been investigated for its impact on other nearby neutron-rich nuclei. Just beyond the N = 40 subshell closure, nuclei exhibit a sudden onset of collectivity as protons are removed from the πf7/2 single-particle state. This apparent fragility has been attributed to shape coexistence between spherical and prolate-deformed configurations. For 68Co, a recent β-decay study at NSCL concluded that the lowest-energy populated state was attributed to a deformed configuration, extending the presence of shape coexistence to this nucleus. This work reports on 68Co as determined from the analysis of new data from NSCL utilizing the selectivity of low-spin β decay from 68Fe to populate 68Co. An expanded schematic of the low-lying structure of 68Co including half-life information, particularly for the low-lying states, will be presented.
*This work was supported by the NSF under PHY-1102511 and PHY-1350234, the NNSA under DE-NA0000979, DE-NA0002132, DE-NA-0003180, and DE-NA-0003221, by the DOE under DE-AC-06CH11357, DE-FG02-94ER40834, and DE-FG02-96ER40983, and U.S. ARL under W911NF-12-2-0019.
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Presenters
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Benjamin Patrick Crider
- Mississippi State Univ