Excited states in ${}^{161}\mathrm{Re}$ were populated using the ${}^{106}\mathrm{Cd}$(${}^{58}\mathrm{Ni}$, $p2n$) reaction at a beam energy of 270 MeV, resulting in the first observation of γ rays emitted from this nucleus. The reaction products were separated from scattered beam and fission fragments by the gas-filled recoil separator RITU, and were implanted in the double-sided silicon strip detectors of the GREAT spectrometer. Prompt γ rays were detected by the JUROGAM Ge detector array and were assigned to ${}^{161}\mathrm{Re}$ based on α- and proton-decay tagging of the implanted reaction products. The near-yrast high-spin level structure, which was delineated to spins around $39/2$, is discussed in the context of the total Routhian surface formalism. The level scheme is interpreted in terms of the alignment of $h_{9/2}/f_{7/2}$ neutrons at lower spins, followed by excitations involving the $\pi h_{11/2}$ subshell at higher spins.

• Received 1 May 2006

DOI:https://doi.org/10.1103/PhysRevC.74.024316