XIE Yuan-xiang, XU Shu-wei, MA Rui-chang, LI Zhan-kui, GUO Ying-xiang, ZHANG Tian-mei, GE Yuan-xiu, WANG Chun-fang, GUO Bin,
XING Jian-ping, GUO Tian-rui, WANG Yan-yu, ZHU Shao-fei, XU Wang, DU Jin-zhou1
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
1Department of Modern Physics, Lanzhou University, Lanzhou 730000
Abstract: The nuclide 129Ce was produced by a (16O, 4n) reaction on an enriched 117Sn target. Reaction products were transported to a shielded location by using a helium-jet tape transport system. An activity of 4.1 min in chemically separated cerium sample was identified as 129Ce. Based on x-γ-t and γ-γ-t coincidence measurements, the (EC+β+) decay scheme of 129Ce was proposed, and takes accounts of 50 observed γ-lines.
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