缺中子^(120)Ba核EC/β^+衰变的再研究  

Reinvestigation for EC/β^+ Decay of Neutron-Deficient Nuclide ^(120)Ba

作　　者：谢元祥[1] 徐树威[1] 李占奎[1] 马瑞昌[1] 于涌[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》1999年第12期1129-1134,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金!19775056;中国科学院重大资助

摘　　要：利用１７１ＭｅＶ(３２)Ｓ束轰击(９２)Ｍｏ靶，熔合蒸发（２ｎ２ｐ）反应合成了(１２０)Ｂａ核．由氦喷嘴反冲快速带传输系统将反应产物送到低本底区．位于带子两侧的两个平面型高纯锗探测器对反应产物进行了符合测量．经离线数据分析，对早先发表的(１２０)Ｂａ衰变γ射线予以确认，并补充了１９条强度较弱、能量较低的γ射线．建议了(１２０)Ｂａ的衰变纲图共包括３５条γ射线和２５条能级．120Ba was produced by irradiation of 92Mo with 171MeV 32S via fusion-evaporahon reaction channel. The reaction preducts were camed to a low-backgroundregion using a He-jet recoil fast tape transport system. Two planar High-PurityGermanitim detectors were put at oppsite sides of the tape so as to make acoincidence measurements. Based on the data analysis, the previously Published y raysin 120Ba decay were proved and other nineteen y rays with weaker intensity and lowerenergy were also assigned to 120Ba decay. A new decay scheme of 120Ba was proposed.It includes 35 γ rays and 25 energy levels.

关 键 词：EC/β^+衰变 衰变纲图 ^120Ba核 Γ射线 

分 类 号：O571.3[理学—粒子物理与原子核物理]