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Low-spin states and the non-observation of a proposed 2202-keV, 0 + isomer in 68 Ni

2012; American Institute of Physics; Volume: 86; Issue: 4 Linguagem: Inglês

10.1103/physrevc.86.041304

1538-4497

C. J. Chiara, R. Broda, W. B. Walters, R. V. F. Janssens, M. Albers, M. Alcorta, P. F. Bertone, M. P. Carpenter, C. R. Hoffman, T. Lauritsen, A. M. Rogers, D. Seweryniak, S. Zhu, F. G. Kondev, B. Fornal, W. Królas, J. Wrzesiński, N. Larson, S. N. Liddick, C. J. Prokop, S. Suchyta, H. M. David, D. T. Doherty,

Atomic and Molecular Physics

The low-spin level scheme of ${}^{68}$Ni was investigated with the Gammasphere array following reactions between a ${}^{70}$Zn beam and ${}^{238}$U, ${}^{208}$Pb, and ${}^{197}$Au targets. Spin assignments for some states have been verified through $\ensuremath{\gamma}$-ray angular correlations, including the ${0}^{+}$ assignment for the 2511-keV level. Two previously unknown states at 3302 and 3405 keV have been identified. No evidence was found for a recently reported 216-ns, ${0}^{+}$ isomer at 2202 keV that was attributed to a proton two-particle, two-hole intruder configuration, despite experimental conditions similar to those used in the measurement reporting its discovery.