中子数 N=50核^(88)Sr的高自旋态

High Spin States in the N = 50 Nucleus ^(88)Sr

在用８２Ｓｅ束流和天然 Ｂａ靶之间的深部非弹反应研究类靶余核激发态时，Ｂａ靶严重氧化，８８Ｓｒ的激发态由１６Ｏ与８２Ｓｅ之间的融合蒸发反应产生．通过在束γ谱学方法测量了８８ Ｓｒ的退激 γ射线，提取了γ跃迁的 ＤＣＯ系数和角分布各向异性因子，对所有能级进行了自旋指定．在已知能级之上观测到了两个高自旋能级结构，自旋、激发能分别达到１３ｈ，８５２０ｋｅＶ和１２ｈ，７９０９ｋｅＶ．根据能级衰变特征和邻近Ｎ＝５０同中子素的能级结构系统性，对高自旋态的组态进行了讨论．

Excited states of 88 Sr have been produced in the fusion evaporation reaction between 82 Se beam and 16 O from a heavily oxidized Ba target and studied using the in-beam γspectroscopy tech- niques. Two high-spin level structures have been Observed and established up to 8. 5MeV and 7 .9MeV excitation energy with spin values of 13 h and 12h, respectively. Based on the measure- ments of the DCO ratios and anisotropies of γ-rays, spin values of the excited states have been as- signed up to the highest levels observed. Possible coofgurations are discussed for the two high spin level structures.