(EC+beta(+)) decay of neutron-deficient nuclide Ce-129

Citation
Yx. Xie et al., (EC+beta(+)) decay of neutron-deficient nuclide Ce-129, HIGH EN P N, 25(3), 2001, pp. 198-204
Citations number
9
Categorie Soggetti
Physics
Journal title
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION
ISSN journal
02543052 → ACNP
Volume
25
Issue
3
Year of publication
2001
Pages
198 - 204
Database
ISI
SICI code
0254-3052(200103)25:3<198:(DONNC>2.0.ZU;2-L
Abstract
The nuclide Ce-129 was produced by a (O-16,4n) reaction with an enriched Sn -117 target. With the aid of a helium-jet tape transport system, the reacti on products were transported to a shielded location,where Ce samples were p repared after chemical separation. The neighboring isotopes of Sn-117, Sn-1 16 and Sn-118,were also bombarded with O-16 beam. Different isotopes of Ce were further separated by comparing the products in the above three reactio ns. An activity with a half-life of 4.1 min in the chemically purified ceri um samples was identified as Ce-129. Based on X-gamma -t and gamma-gamma -t coincidence measurements, the EC/beta (+) decay scheme of Ce-129, includin g 51 gamma lines, was proposed. Using the observed growth-decay curve of an intense 278.6keV gamma line of La-129 decay, the beta feeding branch from the ground state of Ce-129 directly to the ground state of La-129 was estim ated to be (26 +/- 7) %. In addition, the gamma spectra gated by both La-K- alpha-X ray and intense 68.2keV gamma ray of Ce-129 decay as well as the ti me spectra of typical gamma rays were also presented here.