The decay of mass-separated ${}_{}{}^{124}{}_{}{}^{}\mathrm{Ag}$ to ${}_{}{}^{124}{}_{}{}^{}\mathrm{Cd}$ was studied by $\gamma$ singles and $\gamma \gamma$ coincidence measurements. A half-life for ${}_{}{}^{124}{}_{}{}^{}\mathrm{Ag}$ of 0.17 ± 0.03 s was measured. The one $\gamma$ ray from ${}_{}{}^{124}{}_{}{}^{}\mathrm{Ag}$ decay observed at 613 keV is postulated to depopulate the $2_1^{}{}_{}{}^{+}$ state in ${}_{}{}^{124}{}_{}{}^{}\mathrm{Cd}$. The resulting extension of the systematics of even-even Cd isotopes is discussed.

[RADIOACTIVITY ${}_{}{}^{124}{}_{}{}^{}\mathrm{Ag}$, ${}_{}{}^{124}{}_{}{}^{}\mathrm{Cd}$ [from ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}(\mathrm{n},f)$]; measured $T_{\frac{1}{2}}$, $E_{\gamma }$, $I_{\gamma }$, $\gamma \gamma$ coin for ${}_{}{}^{124}{}_{}{}^{}\mathrm{Ag}$, ${}_{}{}^{124}{}_{}{}^{}\mathrm{Cd}$ measured $T_{\frac{1}{2}}$; Ge(Li) detectors; ${}_{}{}^{124}{}_{}{}^{}\mathrm{Cd}$ deduced levels $J$, $\pi$. Mass-separated ${}_{}{}^{124}{}_{}{}^{}\mathrm{Ag}$ and ${}_{}{}^{124}{}_{}{}^{}\mathrm{Cd}$ activity.]

• Received 1 July 1983

DOI:https://doi.org/10.1103/PhysRevC.29.1078