The yrast structure of the neutron-rich nucleus ${}^{97}\mathrm{Zr}$ has been studied using fission of targetlike products in the reaction of a ${}^{48}\mathrm{Ca}$ beam on a thick ${}^{238}\mathrm{U}$ target. The level scheme, known from previous studies up to an excitation energy and spin-parity of approximately 4619 keV and $23/2^{-}$, has been extended by about 3 MeV and a few units of angular momentum. Two states fed in the $\beta$ decay of the $27/2^{-}$ high-spin isomer in ${}^{97}\mathrm{Y}$ were identified at 5570 and 5606 keV. The located level structure can be discussed in terms of shell-model configurations.

• Received 8 May 2009

DOI:https://doi.org/10.1103/PhysRevC.80.017302