Abstract

A $^{60}\mathrm{Co}$ source has been used to photoactivate the 392 keV (${T}_{1/2}$\ensuremath{\sim}99.5 min) isomeric level of $^{113}\mathrm{In}$ and the 388 keV (${T}_{1/2}$\ensuremath{\sim}2.8 h) isomeric level of $^{87}\mathrm{Sr}$. As observed in investigations of $^{115}\mathrm{In}$ and $^{111}\mathrm{Cd}$, nonresonant processes were found to make significant contributions to the excitation of isomeric levels.

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