缺中子^(176)Ir核β^+／EC衰变研究  

β+/EC-Decay Study of ^(176)Ir Neutron-Deficient Isotope

作　　者：王华磊[1] 张玉虎[1] 周小红[1] 郭应祥[1] 雷祥国[1] 谢元祥[1] 徐树威[1] 邢烨炳[1] 郑勇[1] 柳敏良[1] 谢成营[1] 宋立涛[1] 骆鹏[1] 于海萍[1] 郭文涛[1] 丁华杰[1] 牛雁宁[1] 

机构地区：[1]中国科学院近代物理研究所

出　　处：《高能物理与核物理》2006年第3期201-206,共6页High Energy Physics and Nuclear Physics

基　　金：国家杰出青年科学基金(10025525)国家自然科学基金(10375077;10221003)国家重点基础研究发展规划项目(TG2000077400)中国科学院基金资助~~

摘　　要：在210MeV的束流能量下,利用重离子熔合蒸发反应146Nd(35Cl,5nγ)176Ir产生具有β+／EC衰变性质的核素176Ir,由氦喷嘴快速带传输系统将反应产物传送到低本底区进行测量．经过实验数据的离线处理分析,对早先发表的176Ir衰变γ跃迁进行确认的同时又发现了3个新能级和10条新的γ射线, 丰富了176Os核的低位激发态能级纲图．并根据典型γ射线的衰变时间谱建议了176Ir核的一个长寿命的低自旋同核异能态．The β^＋/EC decay of doubly odd ^176Ir has been investigated using ^146Nd（^35Cl, 5nγ）^178Ir heavy ion fusion evaporation reaction at 210MeV bombarding energy. With the aid of a helium-jet recoil fast tape transport system, the reaction products were transported to a low-background location for measurements. Based on the data analysis, the previously published γ rays in ^176Ir decay were proved, moreover, 3 new levels and 10 new γ rays were assigned to ^176Ir decay. The new level scheme of ^176Os with low excitation energy has been established. The time spectra of typical γ rays clearly indicate a long-lived low-spin isomer in ^176Ir nuclide.

关 键 词：EC/β^+衰变 氨喷嘴带传输系统 衰变纲图 半衰期 

分 类 号：O571.3[理学—粒子物理与原子核物理] TP393[理学—物理]