Beta(-) Decay Of Ce-150 To Odd-Odd Pr-150

The beta(-) decay of Ce-150 having a half-life of 6.05(7) s produced by the thermal-neutron-induced fission of U-235 has been studied using the on-line isotope separator at the Kyoto University Research Reactor. A decay scheme containing 18 excited levels and 55 gamma-rays was constructed from gamma-ray singles and gamma-gamma coincidence measurements. Of these, 9 levels and 37 gamma-rays were newly placed. The dominant beta-feeding observed at the 110 keV level of Pr-150 was found to be an allowed unhindered spin-flip transition. On the basis of the systematics of the neighboring nuclides, the Gallagher-Moszkowski coupling rules, and the selection rules for the beta-decay of deformed nuclei, the Nilsson configurations of the ground and 110 keV states in Pr-150 were newly proposed to be pi 5/2(+)[413]-upsilon 3/2(-)[521] and pi 5/2(-)[532]-upsilon 3/2(-)[532], respectively.