摘要
利用能量为８５—１０５ＭｅＶ的１６Ｏ束流，通过１８７Ｒｅ（１６Ｏ，５ｎ）反应研究了１９８Ｂｉ的高自旋态能级结构．用６台ＢＧＯ（ＡＣ）ＨＰＧｅ探测器和一台用于探测低能γ跃迁的平面探测器进行了γ射线的激发函数、γ－γ—ｔ符合及γ射线的角分布测量．基于这些测量，首次建立了包括２６条γ跃迁的１９８Ｂｉ的高自旋能级纲图，确定了一个半寿命为（８．０±３．６）ｎｓ，自旋和宇称为１５＋的同质异能态．基于较重的双奇铋核２００－２０６Ｂｉ能级结构的系统性，定性地对１９８Ｂｉ的能级结构进行了解释．
The high-spin states in 198Bi have been studied with the 187Re(16O,5n)198Bi reaction at 16O energies between 85 and 105 MeV.In-beam measurements of γ-ray excitation functions γ-γ-t coincidences and γ-ray angular distributions were carried out with 6 BGO(AC)HPGe detectors and an intrinsic Ge planar detector.A level scheme of 198Bi with 26 γ-rays was established for the first time,and an 15+ isomer was determined with t1/2=8.0±3.6ns.Based on the known level systematics in 200-206Bi,the level structure in 198Bi was qualitatively interpreted.
出处
《高能物理与核物理》
CSCD
北大核心
1996年第9期769-777,共9页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金资助
