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中文摘要: 利用HIRFL提供的 2 2 Ne束流轰击锕系放射性靶 2 4 1Am ,通过熔合 蒸发反应生成了 10 5号元素的一些同位素 ,经对其衰变特性的测量和母子体关系的分析 ,确定已合成了 10 5号元素的新同位素 2 59Db ,其α衰变能Eα=9.4 7MeV ,半衰期为 0 .5 1秒。在 18O轰击Th的实验中 ,产物经化学分离后用已预先处理过的云母探测器及γ探测器同时测量 ,测得两例碎片径迹 ,经分析认定它是来自 2 3 0 Ac的缓发裂变 ,从而确定 2 3 0 Ac是缓发裂变先驱核 ,其缓发裂变几率为 (1.19± 0 .85 )× 10 -8。
Abstract:After measuring the decay properties of the produced element by bombardment of 241 Am with 22 Ne beam at HIRFL and analyzing their mother daughter relations,it shows that a new nuclide 259 Db with E α =9.47 MeV and T 1/2 =0.51s has been synthesized. The reaction production of 18 O + 232 Th was separated chemically and then measured by pre etched mica foil and γ detector at the same time in a lead shielded low background room. Two fission fragment tracks observed in the mica foil have been determined to come from 230 Ac delayed fission, and a delayed fission probability of (1.19±0.85)×10 -8 for 230 Ac is obtained.
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郭俊盛,袁双贵,靳根明.超重新核素259Db的合成及230Ac β-缓发裂变的确证[J].中国科学院院刊,2002,(2):108-111.
Guo Junsheng,Yuan Shuanggui,Jin Genming.Synthesis of New Super-heavy Nuclide 259Db and Determination of β-delayed Fission Precursor 230Ac[J].Bulletin of Chinese Academy of Sciences,2002,(2):108-111.
郭俊盛,袁双贵,靳根明.超重新核素259Db的合成及230Ac β-缓发裂变的确证[J].中国科学院院刊,2002,(2):108-111.
Guo Junsheng,Yuan Shuanggui,Jin Genming.Synthesis of New Super-heavy Nuclide 259Db and Determination of β-delayed Fission Precursor 230Ac[J].Bulletin of Chinese Academy of Sciences,2002,(2):108-111.
