The signs of the quadrupole moments and the induced nuclear polarization of $8^{+}$ isomers in ${}_{}{}^{88}{}_{}{}^{}$,90Zr have been measured by the tilted multifoil technique. The isomers were populated by pulsed ${}_{}{}^{16}{}_{}{}^{}$,18O beams and polarized by the tilted multifoil interaction. The recoil nuclei were implanted into a single crystal of Zr and the quadrupole precession was observed. The sign of the Q moments was measured to be positive for ${}_{}{}^{88}{}_{}{}^{}\mathrm{Zr}$ and negative for ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$, in accordance with shell model predictions.

• Received 21 November 1985

DOI:https://doi.org/10.1103/PhysRevC.33.1517