Oblate shapes of four high-spin isomers in Gd isotopes (${10}^{+}$ in ${}_{}{}^{144}{}_{}{}^{}\mathrm{Gd}$, ${\frac{13}{2}}^{+}$, ${\frac{27}{2}}^{-}$, and ${\frac{49}{2}}^{+}$ in ${}_{}{}^{147}{}_{}{}^{}\mathrm{Gd}$) were established in measurements of the signs of the respective quadrupole moments. A combined tilted-multifoil and time-differential perturbed-angular-distribution technique was employed. The present results are direct evidence for the presumed oblate nature of high-spin states in the $A\approx 150$ region.

• Received 14 September 1984

DOI:https://doi.org/10.1103/PhysRevLett.53.2473