Decay of RadioactiveCe143(33.4 hr)

The beta and gamma radiations of ${\mathrm{Ce}}^{143}$ have been studied with a ten-channel scintillation coincidence spectrometer, with a double-focusing magnetic spectrometer, and with photographic magnetic spectrographs. Five beta-ray components and ten gamma rays are identified with the activity, and the decay scheme is established involving six excited states of the daughter ${\mathrm{Pr}}^{143}$ nucleus. It is found that no beta rays of measurable intensity proceed directly to the ${\mathrm{Pr}}^{143}$ ground state. Spin and parity assignments are made for several of the levels.