The Nuclear Spectra ofCe144andPr144

The nuclear spectra of ${\mathrm{Ce}}^{144}$ and ${\mathrm{Pr}}^{144}$ have been studied with magnetic and scintillation spectrometers. The 304-kev beta transition of ${\mathrm{Ce}}^{144}$ was found to be 70.5 percent abundant from a Kurie plot analysis. For the beta spectra leading to the 134-kev and 81-kev levels, intensities of 22 percent and three percent were obtained, respectively, from internal conversion and gamma-ray data. An energy level of 175 kev in ${\mathrm{Pr}}^{144}$ was inferred from energy balance considerations. The relative intensities of the ${\mathrm{Pr}}^{144}$ beta transitions were determined from the abundance of the 695-kev gamma transition in ${\mathrm{Nd}}^{144}$ which was found to be 1.25±0.2 percent. A spin of one and odd parity appears plausible for the 2185-kev level in ${\mathrm{Nd}}^{144}$.