Energy Levels ofPr143

The gamma rays of ${\mathrm{Pr}}^{143}$, following the beta decay of ${\mathrm{Ce}}^{143}$, have been studied with a scintillation co-incidence spectrometer. The existence of levels at 57, 350, 725, 945, and 1167 keV has been confirmed. In addition, a level at 493 keV has been established. The directional correlation functions for the 668-57-keV, 232-493-keV, and 293-57-keV cascades in ${\mathrm{Pr}}^{143}$ have been measured. A spin of $\frac{5}{2}$ has been assigned to the 57 and 725-keV levels and a spin of $\frac{7}{2}$ to the 350-keV level. The spin of the 493-keV level may be either $\frac{5}{2}$ or $\frac{7}{2}$. The experimental level structure is compared with the theoretical predictions.