Decay of 49-minCd118and 5.1-secIn118

Abstract

The decay properties of 49-min ${\mathrm{Cd}}^{118}$ and its daughter 5.1-sec ${\mathrm{In}}^{118}$ are established. The ${\mathrm{Cd}}^{118}$ has a low $\beta$-decay energy and seems to be an allowed transition. The ${\mathrm{In}}^{118}$ has (4.2±0.4)-Mev $\beta$-decay energy, with about 15% of the decays going to the 1.22-Mev excited state of ${\mathrm{Sn}}^{118}$, both $\beta$ transitions being allowed. It is proposed that a previously identified 4.5-min In species is a high-spin isomer ${\mathrm{In}}^{118m}$ not formed in the $\beta$ decay of ${\mathrm{Cd}}^{118}$ or formed directly in uranium fission.