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This paper reports measurements using the technique of On Line NuclearOrientation (OLNO) which reexamine the gamma decay of isomeric $^{\rm180}$Hf$^{\rm m}$ and specifically the 501 keV 8$^{\rm -}$ -- 6$^{\rm +}$transition. The irregular admixture of E2 to M2/E3 multipolarity in thistransition, deduced from the forward-backward asymmetry of its angulardistribution, has for decades stood as the prime evidence for parity mixing innuclear states. The experiment, based on ion implantation of the newlydeveloped mass-separated $^{\rm 180}$Hf$^{\rm m}$ beam at ISOLDE, CERN into aniron foil maintained at millikelvin temperatures, produces higher degrees ofpolarization than were achieved in previous studies of this system. The valuefound for the E2/M2 mixing ratio, $\epsilon$ = -0.0324(16)(17), is in closeagreement with the previous published average value $\epsilon$ = - 0.030(2), infull confirmation of the presence of the irregular E2 admixture in the 501 keVtransition. The temperature dependence of the forward-backward asymmetry hasbeen measured over a more extended range of nuclear polarization thanpreviously possible, giving further evidence for parity mixing of the 8$^{\rm-}$ and 8$^{\rm +}$ levels and the deduced E2/M2 mixing ratio.

Confirmation of Parity Violation in the Gamma Decay of $^{180}Hf^{m}$