Abstract
Level structures in {sup 60,62}Fe{sub 34,36} and adjacent nuclei were studied with Gammasphere using the reaction of a 430-MeV {sup 64}Ni beam on a 55-mg/cm{sup 2} thick {sup 238}U target. High-spin level schemes were deduced from singly- and doubly-gated prompt coincidence events. Levels populated in the {beta} decay of {sup 60,62}Mn isomers were studied in singly- and doubly-gated delayed coincidences. Spin and parity assignments were deduced from angular correlations of {gamma} rays observed in both nuclei, leading to firm positive-parity yrast assignments up through 8{sup +} in {sup 62}Fe. The observed levels for {sup 60}Fe up to {approx}3.5 MeV compare well with pf shell-model calculations available in the literature. Calculations performed in a limited pfg basis exhibit reasonable agreement for the 2{sup +}, 4{sup +}, and 6{sup +} levels in {sup 62}Fe. However, theoretical descriptions that include the newly identified negative-parity levels in {sup 62}Fe require a much larger basis, necessarily including g{sub 9/2} neutrons, as well as improved interactions leading to negative-parity levels.
Published Version
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