重丰中子新同位素——^(238)Th  

A New Heavy Neutron rich Isotope—— 238 Th

作　　者：徐岩冰[1] 袁双贵[1] 杨维凡[1] 何建军[1] 李宗伟[1] 马桃桃[1] 熊兵[1] 秦芝[1] 牟万统[1] 甘再国[1] 石立军[1] 郭天瑞[1] 陈展图[1] 郭俊盛[1] 

机构地区：[1]中国科学院近代物理研究所

出　　处：《原子核物理评论》1998年第3期191-192,共2页Nuclear Physics Review

基　　金：国家自然科学基金;中国科学院资助

摘　　要：利用兰州重离子加速器（ＨＩＲＦＬ）提供的６０ＭｅＶ／ｕ的１８Ｏ离子束照射天然铀靶，通过多核子转移反应生成２３８Ｔｈ．用快速放射化学分离技术从铀及其反应产物的混合物中分离出Ｔｈ同位素．使用两台高纯锗（ＨＰＧｅ）探测器测量了样品的γ射线活性，观测到了２３８Ｔｈ的β－衰变子体２３８Ｐａ的γ射线的生长、衰变行为，测定２３８Ｔｈ的半衰期为９．４±２．０ｍｉｎ．A new nuclide 238 Th has been produced via multinucleon transfer reaction by 60 MeV/u 18 O ion irradiation of natural uranium. The produced thorium was radiochemically separated from the mixture of uranium and its reaction products. The activity of thorium was measured by using a HPGe detector and a planar HPGe detector. 238 Th has been identified for the first time by measuring the growth and decay of the γ rays from its daughter nucleus 238 Pa. The half life of 238 Th was determined to be 9.4±2.0 min.

关 键 词：新核素 多核子转移反应 重丰中子 Th238 

分 类 号：O615.3[理学—无机化学]