^(130)Nd和^(140)Tb的EC/β^+衰变研究  

(EC/β^+) Decay of ^(130)Nd and ^(140)Tb

作　　者：于涌[1] 谢元祥[1] 徐树威[1] 李占奎[1] 潘强岩[1] 王春芳[1] 邢建萍[1] 张天梅[1] 

机构地区：[1]中国科学院近代物理研究所,兰州730000

出　　处：《高能物理与核物理》2001年第2期108-114,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金!(19975057);中国科学院重大项目;国家重点基础研究发展规划!(G2000077400)资助

摘　　要：利用能量为１７０ＭｅＶ左右的３６Ａｒ重离子束轰击９６Ｒｕ和１０６Ｃｄ浓缩同位素靶，分别生成缺中子同位素１３０Ｎｄ和１４０Ｔｂ．借助氦喷嘴带传输系统，用 Ｘ－γ和 γ－γ符合方法，分离鉴别了这两种核素，并进一步测定了它们的衰变性质．得到１３０ Ｎｄ的半衰期为（１３± ３）ｓ，首次建议了它的ＥＣ／β＋衰变纲图，推测了其子核１３０Ｐｒ的基态和低位能级的自旋宇称．修订了１４０Ｔｂ的原有极简单的ＥＣ／β＋衰变纲图并指认１４０Ｔｂ的基态自旋宇称为７＋．Isotopes,130Nd and 140Tb were produced using enriched targets 96Ru and 106Cd, respectively,bombarded by 36Ar ion beam. The two nuclides were identified and studied by a He-jet tape transport system in combination with 'X-γ' and 'γ-γ' coincidence measure- ments. The half-life of 130Nd was determined to be (13 ± 2) s. The EC/β+ decay scheme of 130Nd was proposed for the first time, and the spins and parties of the ground-state and observed low-lying states in the daughter nucleus 130Pr were speculated tentatively. The previous simple EC/β+ decay scheme of 140Tb was revised, and the spin-parity of its groundstate was assigned to be 7+.

关 键 词：EC/β^+衰变 衰变纲图 氦喷嘴带传输系统 铽原子核 钕原子核 核素 

分 类 号：O571[理学—粒子物理与原子核物理]