Abstract
The quadrupole interaction of excited $^{111}\mathrm{Cd}$ nuclei with electric field gradients due to lattice defects in fcc palladium has been studied by the technique of time-differential observation of perturbed angular distribution of $\ensuremath{\gamma}$ rays. The lattice defects were induced by the recoiling ions following the nuclear reaction $^{108}\mathrm{Pd}(\ensuremath{\alpha},n)^{111}\mathrm{Cd}$. A sharp frequency of 87(2) MHz is assigned to trapped interstitials. A broad temperature-dependent frequency distribution arising from various other lattice defects was found. A migration energy of 0.10(2) eV for free interstitials is deduced.
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