Transitions inPd107Following 22-minRh107Decay

Abstract

We have studied the decay of ${}_{}{}^{107}{}_{}{}^{}\mathrm{Rh}$ by $\gamma$-ray spectroscopy using Ge(Li) detectors and $\mathrm{Ge}\left(\mathrm{Li}\right)-\mathrm{N}\mathrm{a}\mathrm{I}{\left(\mathrm{Tl}\right)}_{\gamma \gamma }$ coincidence techniques. A decay scheme has been constructed incorporating all but six of the 39 transitions reported. This decay scheme involves excited states in ${}_{}{}^{107}{}_{}{}^{}\mathrm{Pd}$ at 115.6, 302.8, 312.2, 348.2, 381.8, 392.5, 471.2, 567.7, 670.0, 1102, and 1148 keV. A half-life of 850±100 nsec was found for the 115.6-keV level, and $\gamma \gamma$ delayed-coincidence spectroscopy was employed to determine the features of the decay scheme related to this level. $\beta$ branching ratios and $log\mathrm{ft}$ values have been derived from the relative $\gamma$-ray intensities and the $\frac{\beta }{\gamma }$ ratio. We find that the $\beta$ decay of ${}_{}{}^{107}{}_{}{}^{}\mathrm{Rh}$ tends to avoid populating ${}_{}{}^{107}{}_{}{}^{}\mathrm{Pd}$ levels that have strong single-particle character [that is, levels populated strongly in ($d,p$) and ($d,t$) reactions].