Structure of Fe 60 , 62 and the onset of ν g 9 / 2 </mml…
2010; American Institute of Physics; Volume: 82; Issue: 4 Linguagem: Inglês
10.1103/physrevc.82.044305
ISSN1538-4497
AutoresN. Hoteling, C. J. Chiara, R. Broda, W. B. Walters, R. V. F. Janssens, M. Hjorth‐Jensen, M. P. Carpenter, B. Fornal, A. A. Hecht, W. Królas, T. Lauritsen, T. Pawłat, D. Seweryniak, X. Wang, A. Wöhr, J. Wrzesiński, S. Zhu,
Tópico(s)Nuclear Physics and Applications
ResumoLevel structures in $^{60,62}\mathrm{Fe}{}_{34,36}$ and adjacent nuclei were studied with Gammasphere using the reaction of a $430$-MeV $^{64}\mathrm{Ni}$ beam on a 55-mg/cm${}^{2}$ thick $^{238}\mathrm{U}$ target. High-spin level schemes were deduced from singly- and doubly-gated prompt coincidence events. Levels populated in the $\ensuremath{\beta}$ decay of $^{60,62}\mathrm{Mn}$ isomers were studied in singly- and doubly-gated delayed coincidences. Spin and parity assignments were deduced from angular correlations of $\ensuremath{\gamma}$ rays observed in both nuclei, leading to firm positive-parity yrast assignments up through ${8}^{+}$ in $^{62}\mathrm{Fe}$. The observed levels for $^{60}\mathrm{Fe}$ up to $~3.5$ MeV compare well with $\mathit{pf}$ shell-model calculations available in the literature. Calculations performed in a limited $\mathit{pfg}$ basis exhibit reasonable agreement for the ${2}^{+}$, ${4}^{+}$, and ${6}^{+}$ levels in $^{62}\mathrm{Fe}$. However, theoretical descriptions that include the newly identified negative-parity levels in $^{62}\mathrm{Fe}$ require a much larger basis, necessarily including ${g}_{9/2}$ neutrons, as well as improved interactions leading to negative-parity levels.
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