~(229)Ra的衰变

摘要: 用１４ＭｅＶ中子轰击钍靶，通过２３２Ｔｈ（ｎ，α）２２９Ｒａ反应产生２２９Ｒａ，用放射化学方法从被照靶物质中分离出２２９Ｒａ。利用γ（Ｘ）谱学方法，首次观测到了能量分别为１４．５，１５．６，１８．８，２１．８，２２．５，４４．０，４７．５，５５．０，６３．０，６９．６，９３．６，９４．１，９８．５，１０２．２，１０４．５，１０６．１，１６１．１，１７１．５ｋｅＶ的２２９Ｒａ衰变的１８条新γ射线，建立了２２９Ｒａ的部分衰变纲图。

Abstract: THE DECAY OF 229RaFang Keming Yang Weifan Yuan Shuanggui Shen Shuifa Mou WantongZhang Xueqian Li Zongwei Zhong Jiquan Guo Tianrui Chen Zhantu(Institute of Modern Physics, the Chinese Academy of Sciences, Lanzhou 730000)ABSTRACT229Ra is produced in the 232Th(n,α)　229Ra reaction using 14 MeV neutron irradiation of natural thorium. The 229Ra activities are radiochemically separated from the irradiated target material. 18 new γ rays of 229Ra decay with the energies of 14.5, 15.6, 18.8, 21.8, 22.5, 44.0, 47.5, 55.0, 63.0, 69.6, 93.6, 94.1, 98.5, 102.2, 104.5, 106.1, 161.1, 171.5 keV are found for the first time. A partial decay scheme of 229Ra is proposed.Key words 229Ra Coincidence measurement Decay scheme