Abstract
A $^{60}\mathrm{Co}$ source has been used to study the photoactivation of the 336 keV (${T}_{\frac{1}{2}}\ensuremath{\sim}4.3$h) isomeric level of $^{115}\mathrm{In}$. In contrast to earlier investigations, we have considered the possibility of nonresonant processes and have developed a technique which allows us to distinguish between activation via the resonance fluorescence of the 1078 keV $^{115}\mathrm{In}$ level, and by nonresonant processes involving the 1172 and 1332 keV $^{60}\mathrm{Co}$ photons. We have found that nonresonant processes are the dominant modes of activation. Although various possible mechanisms for the nonresonant excitation have been considered, none seem sufficiently strong to explain our results.RADIOACTIVITY $^{115}\mathrm{In}$; studied photoactivation with $^{60}\mathrm{Co}$, measured ${\ensuremath{\Gamma}}_{0}$ for 1078 keV, investigated excitation mechanism.
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