Short-lived Isotopes of Lanthanum, Cerium and Praseodymium Studied by SISAK-technique

Short-lived, neutron-rich isotopes of the rare earth elements La, Ce and Pr have been studied by the means of a continuous solvent extraction separation method (SISAK). Half-lives, energies and relative intensities are reported for γ-rays attributed to 40 \ub1 3 sec 144La, 20 \ub1 5 sec 145La, 11 \ub1 1 sec 146La, 58 \ub1 3 sec 147Ce, 45 \ub1 5 sec 148Ce and 9\ub71 \ub1 0\ub74 sec 150Pr. Indirect evidence for the isolation of 5 sec 149Ce and 5–10 sec 150Ce is also presented along with upper half-life limits of 5 sec for 147La and 148La