关键词: 
丰中子核素 /
元素分离 /
熔化靶装置 /
半衰期

摘要:  新丰中子同位素²⁰⁸Hg,首次从30MeV/u的¹²C束轰击厚的天然铅靶反应产物中被鉴定出来,²⁰⁸Hg的鉴别基于二步化学分离及γ活性分析,第一步,借助于在本工作中所发展起来的熔化靶装置和一种特殊的热色谱技术,实现了Hg元素产物高效、高选择性的分离,第二步则是周期性的提取随着收集样品中的丰中子Hg同位素的β—衰变而生长起来的Tl元素,在提取的Tl样品中,观察到能量为2614.6keV、半衰期为191±10~4 50s的γ活性,它只能被指定为²⁰⁸Hg的β—衰变子体²⁰⁸Tl,将测得的²⁰⁸Hg半衰期42±23 12min与理论预言进行了比较。 The new neutron-rich isotope ²⁰⁸Hg was identified for the first time from the reactionproducts in a thick ^natPb target bombarded by a 30MeV/u ¹²C beam. The identification of ²⁰⁸Hg wasbased on two-step chemical separation and γ activity analysis. The first step was the release,separation and collection of Hg element products with a high efficiency and good selectivity bymeans of a melt target device and a special thermochromatographic technique developed in presentwork. The second step was..