Excited States ofCe138

Sources of 2.02-h ${}_{}{}^{138m}{}_{}{}^{}\mathrm{Pr}$ and 1.44-min ${}_{}{}^{138}{}_{}{}^{}\mathrm{Pr}$ were made by the ($p,n$) reaction on enriched ${}_{}{}^{138}{}_{}{}^{}\mathrm{Ce}$, and sources of 5.7-h ${}_{}{}^{138}{}_{}{}^{}\mathrm{Nd}$ were produced by the ($\alpha ,2n$) reaction on enriched ${}_{}{}^{136}{}_{}{}^{}\mathrm{Ce}$. Eighteen $\gamma$ rays plus annihilation radiation were attributed to the decay of ${}_{}{}^{138m}{}_{}{}^{}\mathrm{Pr}$, and twelve $\gamma$ rays plus annihilation radiation were attributed to the decay of ${}_{}{}^{138}{}_{}{}^{}\mathrm{Pr}$. The level scheme of ${}_{}{}^{138}{}_{}{}^{}\mathrm{Ce}$ is discussed. Evidence is given for the existence of a ($2^{+}$) level of ${}_{}{}^{138}{}_{}{}^{}\mathrm{Ce}$ at 1510.9 keV, near the previously reported $0^{+}$ and $4^{+}$ levels at, respectively, 1477.0 and 1826.4 keV.