Low-frequency anomaly inOs172moment of inertia

An investigation of a low-frequency anomaly in the moments of inertia of the yrast sequence of ${}_{}{}^{172}{}_{}{}^{}\mathrm{Os}$ has been carried out via the ${}_{}{}^{144}{}_{}{}^{}\mathrm{S}$,4n) reaction using a 162-MeV ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$ beam. Gamma-gamma coincidence information was obtained from a large array of Compton-suppressed Ge detectors. The ordering of the yrast sequence was deduced to be the same as had been previously proposed. Self-consistent cranked shell-model calculations and three-band-mixing calculations have been performed, but show only limited success in explaining the anomaly.