丰中子核^(113)Ru集体转动带的识别  

Identification of Collective Bands in Neutron-Rich ~113Ru Nucleus

作　　者：张征[1] 朱胜江[1] J.H.Hamilton A.V.Ramayya J.K.Hwang 许瑞清[1] 姜卓[1] 肖树冬[1] I.Y.Lee J.O.Rasmussen W.C.Ma 

机构地区：[1]清华大学物理系 [2]Department of Physics, Vanderbilt University, Nashville, TN37235, USA [3]Lawrence Berkeley National Laboratory, Berkeley, CA94720, USA [4]Department of Physics, Mississippi State University, MS39762, USA

出　　处：《高能物理与核物理》2003年第8期688-691,共4页High Energy Physics and Nuclear Physics

基　　金：国家重点基础研究发展规划项目(G2000077400);国家自然科学基金(19975028);美国能源部(DE-FG05-88ER40407)

摘　　要：通过对重核^(252)Cf自发裂变产生的瞬发γ谱的测量,对非常丰中子核^(113)Ru的能级结构进行了研究,建立了较高自旋态的能级纲图,识别了基于中子h_(11/2)轨道激发产生的集体转动带,最高自旋态达31/2h.还发现了另一个可能基于9/2^-能级的集体转动带,对新建立的^(113)Ru的集体带的一些重要特性进行了讨论。Through measuring high-fold prompt γ- ray coincidence events following the spontaneous fission of 252 Cf with the Gammasphere detector array, new level scheme in the very neutron-rich odd-A 113Ru nucleus has been established. An intruder collective band based on 11/2- level has been identified with spin up to 31/2 k and excitation energy 3.6 MeV. This band most probably originates from vh11/2. intruder orbital. Another collective band probably built on 9/2- level is also observed. Some important characteristics of the collective bands have been systematically discussed.

关 键 词：丰中子核 ^113Ru 集体转动带 较高自旋态 能级纲图 自发裂变 原子核结构 瞬发γ谱 钌 

分 类 号：O571.5[理学—粒子物理与原子核物理]