摘要
利用能量为６０－８０ＭｅＶ的^(１２)Ｃ束流，通过~１９７Ａｎ（^(１２)Ｃ，３ｎ）~２０６Ａｔ反应研究了~２０６Ａｔ核的高自旋能级结构．用７台ＢＧＯ（ＡＣ）ＨＰＧｅ探测器和一台用于探测低能γ射线的平面型ＨＰＧｅ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２５条γ跃迁的~２０６Ａｔ高自旋能级纲图．确定了一个半寿命为（９０８±４００）ｎｓ、自旋和宇称为１０的同质异能态．基于较重的双奇核^(２０８，２１０ )Ａｔ能级结构的系统性，对^(２０６)Ａｔ的１０~－同质异能态进行了讨论．
The high-spin states of ~206At have been studied in the ~197An (~12C, 3n) ~206At re- action at 12C energies from 60 to 80 MeV using technique of in-beam γ-ray spectroscopy. Measurements of Tray excitation functions, γ-γ-t coincidences, and y-ray angular distri- butions were performed. A level scheme for ~206At, including a 10- isomer with a mea- sured half-life of 908±400 ns, was established for the first the. The characteristics of the 10 - isomers in doubly edd 206_At nuclei were stressed. Keywoeds: isomer, half-life, two-body interaction
出处
《高能物理与核物理》
CSCD
北大核心
2000年第4期359-363,共5页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金!(19575059,19635030)
中国科学院"百人计划"
"九五"特别支持项目!(KJ95T-03)
