Excited States ofDy161

Abstract

The $\gamma$ rays following $\beta$ decay of ${\mathrm{Tb}}^{161}$ have been investigated with sodium iodide scintillation counters and with a xenon counter used with and without x-ray escape gating. Gamma rays of 74, 57, 49, and 26 kev were observed together with Dy x-rays. From these data and $\gamma$, $K$ x-ray coincidence measurements, rough estimates are obtained for the $K$ conversion coefficients of the 74- and 57-kev transitions. Combination of the $\gamma$-ray intensities with conversion-electron intensities determined by Cork, Brice, Schmid, and Helmer yields $K$ and $L$ conversion coefficients for all the transitions once the normalization of conversion electron and $\gamma$-ray intensities has been assumed. Where comparison is possible these conversion coefficients agree with those determined from the x-ray and $\gamma$-ray measurements alone.