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丰中子核^(116,118,120)Cd的高自旋态和负宇称能级研究(英文)

High-Spin States and Negative Parity Levels in Neutron-Rich ^(116,118,120)Cd Nuclei
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摘要 通过对 2 52 Cf自发裂变产生的瞬发γ射线的多重符合测量 ,对丰中子核 116,118,12 0 Cd的高自旋态进行了研究 .实验是利用美国罗仑兹伯克利实验室的超级γ球探测装置进行的 .118Cd的晕带自旋扩展到 18 ,而116,12 0 Cd的晕带扩展到 16 .利用推转壳模型对带结构进行了计算 ,对这几个核晕带很陡的回弯现象做了讨论 .在每个核中观测到了 5 -和 7-能级 ,对其特性进行了讨论 .在 118Cd中还观测到一个基于 High spin states in neutron-rich 116,118,120Cd nuclei have been investigated by observing high-fold prompt γ-ray coincidence events from the spontaneous fission of 252Cf with the Gammasphere detector array. The yrast bands have been extended with spin up to 18  in 118Cd and 16  in 116,120Cd respectively. The band structures are calculated using the cranked shell model and possible origination for the backbends in the yrast bands is discussed. Proposed 5 - and 7 - levels are observed in each of these cadmium isotopes, and possible explanation for the negative states is discussed based on systematic comparison. A quasi-rotational band based on 7 - level in 118Cd has been established.
出处 《高能物理与核物理》 CSCD 北大核心 2004年第1期37-41,共5页 High Energy Physics and Nuclear Physics
基金 国家重点基础研究发展规划项目 (G2 0 0 0 0 7740 0 ) 国家自然科学基金 ( 19975 0 2 8) 美国能源部 (DE FG0 5 88ER40 40 7)资助~~
关键词 高自旋态 带交叉 负宇称能级 丰中子核 中子物理 γ射线 核晕带 回弯现象 high-spin state, band-crossing, negative parity level
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