New Neutron-Deficient Isotope of Cerium

Cerium-132, a positron emitter with a half-life of 4.2±0.2 hours, has been identified through its generic relationship to the known daughter nuclide, ${\mathrm{La}}^{132}$. An activity of 30-minutes half-life and 4.2-Mev maximum positron energy, which may be due to ${\mathrm{Ce}}^{131}$, was also observed.