摘要
以５０ＭｅＶ／ｕ丰中子炮弹１８Ｏ轰击天然铀靶，通过奇异的多核于转移反应产生了２３９Ｐａ，用放射化学分离方法从复杂的反应产物中分离出Ｐａ活性，借助于２３９Ｐａ及其子体２３９Ｕ衰变的观察，鉴别了新重丰中子核素２３９Ｐａ，并测定其半衰期为１０６±３０ｍｉｎ．同时，还发现了能量为５２２．０、５６２．０、６３８．５、６８１．０ｋｅＶ的２３９Ｐａ的四条衰变γ射线。
This paper presents the experimental method and result on observation of a new isotope 239Pa.The 239Pa was produced by 50MeV/u neutron-rich projectile(18O)bombarding natural uranium through exotic multi-nucleon transfer reactions.The new heavy neutron-rich nuclide 239Pa was identified for the first time by using chemical separation and observing the decay of 239Pa was determined to be 106 ± 30min. In addition, four decay γ-ray of 239Pa as well as its daughter 239U,the half-life of 239Pa with energy 522.0,562.0.638.5 and 681.0 keV respectively have been found.
出处
《核技术》
CAS
CSCD
北大核心
1996年第12期705-708,共4页
Nuclear Techniques
基金
国家自然科学基金
中国科学院八.五重大项目
关键词
重丰中子核素
多核子转移反应
镁
Heavy neutron-rich nuclide,Multi-nucleon transfer reaction,Chemical separation,Identification
