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1. 中国科学院近代物理研究所
2. 兰州大学现代物理系
3. 中国科学院近代物理研究所,兰州,730000
纸质出版日期:2002-01-01
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[1]张天梅,杜金洲,徐树威,谢元祥,李占魁.~(130)Ce(EC+β~+)衰变研究及其放射化学分离[J].核技术,2002(01):9-14.
ZHANG Tianmei 1 DU Jinzhou 2 XU Shuwei 1 XIE Yuanxiang 1 LI Zhankui 1 1. (EC+β+) decay study of 130Ce and it’s radiochemical separation[J]. Nuclear techniques, 2002, (1): 9-14.
利用兰州SFC加速的16O束轰击同位素118Sn
由熔合蒸发 4n反应产生目标核13 0 Ce。为了消除本底干扰并指定13 0 Ce核
采用溶剂萃取法对He - jet带传输系统从靶室传输出来的反应产物进行了离线分离与纯化。将目标核13 0 Ce从大量的靶材料、反应产物及母核中分离出来
快速制成薄源后在铅室中进行γ单谱测量及X -γ、γ -γ符合测量。从化学分离后的产物中观察到了半衰期为 2 2 .9min的 10 8条γ射线
其中 10 7条是新发现的
该活性被指定为13 0 Ce。在此基础上
进一步研究这些γ线的级联关系
建立了缺中子同位素13 0 Ce较完整的 (EC + β+ )衰变纲图。为118Sn(16O
4n) 13 0 Ce反应体系建立的放化分离流程的分离时间仅 10min
化学产额大于70 %。化学分离除去 98%以上的核反应生成的13 0 La
对其它杂质的去污完全满足13 0 Ce(EC + β+ )衰变研究的要求。
The nuclide 130 Ce was produced by a ( 16O
4n) reaction carried out at the SFC accelerator of IMP on an enriched 118 Sn target. Reaction products were moved to a shielded location by a He-jet tape-transport system
then using a radiochemical separation procedure in which a solvent extraction and precipitation with oxalic acid method was applied
Ce was separated
purified and made into thin sample rapidly
and then a single spectrum as well as X-γ
γ-γ coincidence measurements was performed . A 22.9min activity in chemical separated sample was identified as 130 Ce. The decay scheme was proposed for the first time. The scheme included 108 lines of γ rays
among which 107 being new. Total separation time of this new chemical procedure was about 10min
and the chemical yield was about 70%. More than 98% La produced in nuclear reaction was removed
decontamination of other impurities also satisfied the requirement of study of 130 Ce (EC+β +) decay scheme.
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