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The nuclideCe was produced by a (O, 4 n) reaction on an enrichedSn target. Reaction products were transported to a shielded location by using a heliumjet tape transport system. A 22.9 min activity in chemically separated cerium sample was identified asCe. The (EC+ β ) decay scheme ofCe was proposed for the first time. This scheme includes 108 γ-lines, 107 γ-lines among them being new. More than 13 1 low-lying states ofLa are populated in the decay ofCe. Two new isomers with half-life of 77±10 ns and 17±5 ns were observed by means of delayed γ-γ coincidence measurements. [ABSTRACT FROM AUTHOR]

Unknown β-delayed proton precursorGd has been synthesized by the reactionCd (S, 3n) and identified using a helium-jet recoil fast tape-transport system with a γ(X)-p coincidence measurements. Its β-delayed proton spectrum has been observed. The half-life ofGd decay has been determined to be 1.1±0.2 s. [ABSTRACT FROM AUTHOR]

Fr has been produced by irradiation ofAu withO,and studied using a He-jet recoil tape transport system.A decay scheme is proposed for the first time,based on X-γ and γ-γ coincidence measurements,which takes account of 20 observed γ-rays. The branching ratio for (EC+ β ) decay ofFr has been estimated to be 3.0±1.5%. Five members of low-lying states inRn can be explained with the configuration [(Rn 2)( νf5/2)]. [ABSTRACT FROM AUTHOR]