Lifetimes of low- and high-spin states in the odd-$A$ nucleus ${}^{177}\mathrm{Hf}$ were measured during the EXILL&FATIMA campaign using a spectrometer equipped with eight HPGe-Clover detectors and 16 fast-timing ${\mathrm{LaBr}}_3\left(\mathrm{Ce}\right)$ detectors. For the determination of lifetimes in the pico- to nanosecond regime, the well-established generalized centroid difference method was used. Lifetimes of the $9/2^{-}$, $9/2^{+}$, $11/2^{-}$, $11/2^{+}$ states were remeasured, the lifetimes of the $13/2^{-}$, $17/2^{-}$, $13/2^{+}$, $15/2^{+}$, and $17/2^{+}$ states were determined for the first time and an upper limit for the $19/2^{+}$ state has been established. From these lifetimes absolute reduced transition probabilities were extracted and compared to particle-rotor-model calculations and quasiparticle-phonon-model calculations showing the importance of including multipole-multipole interactions in the description of odd-$A$ nuclei in the rare earth region.

• Received 30 August 2020
• Accepted 21 October 2020

DOI:https://doi.org/10.1103/PhysRevC.102.054322