Decay Scheme of the 86-secZn61

Abstract

The decay of the 86-sec ${}_{}{}^{61}{}_{}{}^{}\mathrm{Zn}$ has been investigated using Ge(Li) and NaI(Tl) $\gamma$-ray detectors. Coincidence relationships among the $\gamma$ rays were established in $\gamma -\gamma$ coincidence experiments. It was found from observed coincident $\gamma$ rays that the decay of the 86-sec ${}_{}{}^{61}{}_{}{}^{}\mathrm{Zn}$ populates levels at 476.3, 970.7, 1311.1, 1661.4, 1908.1, 2090.9, 2359.2, 2474.3, 2684.7, 2793.7, 2841.5, and 2932.7 keV. Levels in ${}_{}{}^{61}{}_{}{}^{}\mathrm{Cu}$ at 1394.9, 1934.8, level 2858.1, 3016.8, and 3090.4 keV are proposed on the basis of observed $\gamma$-ray intensities, energy sums, and positions established from studies of nuclear reactions. May spin assignments have been made from present $log\mathrm{ft}$ values and previously reported correlation data from studies of nuclear reactions. The half-life of ${}_{}{}^{61}{}_{}{}^{}\mathrm{Zn}$ was measured and found to be 85.9±0.6 sec. The levels in${}_{}{}^{61}{}_{}{}^{}\mathrm{Cu}$ are compared with previously reported theoretical calculations based on current models for the nucleus.