Abstract
The time-differential perturbed angular correlation technique (TDPAC) has been applied to the 482 keV excited state of181Ta, to determine the nuclear electric quadrupole interaction (QI) at Ta in Be. Sources were prepared by ion-implantation of181Hf in Be. Particle channeling measurements have revealed that. Hf impurities implanted in Be reside primarily at the tetrahedral interstitial site. The fundamental QI frequency obtained for Ta at this interstitial site in Be is |vQ| =e2qQ/h = 227.0 ± 2.2 MHz which corresponds to an electric field gradient |eq|=(3.71±0.15)×1017 V/cm2. This result is discussed in terms of results for Cd impurities in the same system and the systematics of the impurity QI in metals.
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