Time-Differential Quadrupole Interaction ofCd111Nuclei Implanted by (α,2n) Reactions into a Cubic Ag Lattice

Abstract

The quadrupole interaction of ${\mathrm{Cd}}^{111}$ ions following the decay of ${\mathrm{In}}^{111}$ implanted by ($\alpha ,2n$) reactions into a cubic (fcc) Ag lattice has been measured with the time-differential perturbed angular correlation method. In addition to a smeared-out quadrupole interaction with a centroid frequency of ${\overline{\omega }}_Q\simeq 2.5$ MHz, about 10% of the implanted ${\mathrm{Cd}}^{111}$ ions experience a unique quadrupole interaction with $\omega _Q^{}{}_{}{}^0=115,130, or 140$ MHz, depending on the primary $\alpha$ beam. Annealing causes the quadrupole perturbation to vanish completely.