In-beam measurements of the nuclear quadrupole interaction of the isomeric states of ${}_{}{}^{67,69,71}{}_{}{}^{}\mathrm{Ge}$ in the polycrystalline metallic lattices Zn and Ga demonstrate that the unperturbed quadrupole interaction pattern can be observed for several microseconds with no indication of radiation-damage effects at target temperatures near the melting point. The symmetry of the interaction in Zn suggests that the Ge recoil nuclei reach substitutional lattice sites. The interaction frequencies point to enhanced electric field gradients at the Ge nucleus.

• Received 8 January 1973

DOI:https://doi.org/10.1103/PhysRevLett.30.656