Experimental apparatus at KUR-ISOL to identify isomeric transitions from fission products, and decay spectroscopy of 151Ce

Kojima Yasuaki

Shibata M.

Taniguchi A.

Kawase Y.

Doi R.

Nagao A.

Shizuma Kiyoshi

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Decay studies on 151Ce have been performed using the on-line isotope separator connected to the Kyoto University Reactor. In addition to conventional γ and conversion electron spectroscopy, β-gated measurements were carried out on mass-separated 151Ce to identify an isomeric transition. From the analysis of the obtained data, the half-life of the isotope was ascertained to be 1.76(6) s and a decay scheme containing six excited levels was constructed for the first time. The excited level at 35.1 keV in 151Pr was found to be a long-lived state (a half-life of approximately 10us or longer).

Radioactivity 151Ce

β-gated measurement

Long-lived level; Decay scheme;

151Pr deduced level

Mass-separation

Mechanical engineering [ 530 ]

eng

Elsevier

Copyright (c) 2006 Elsevier B.V.

[ISSN] 0168-9002

[NCID] AA10529991

[DOI] http://dx.doi.org/10.1016/j.nima.2006.05.014 isVersionOf