论文部分内容阅读
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 order structure of 206At nuclei was investigated by ~ 197An (~ (12) C, 3n) ~ 206At reaction using ~ (12) C beam with energy of 60-80MeV. Gamma-ray excitation functions, gamma-gamma-t coincidence and gamma ray angular distribution measurements were performed with seven BGO (AC) HPGe detectors and a planar HPGe detector for detecting low-energy gamma rays. Based on these measurements, the ~ 206At high spin level framework including 25 γ transitions was first established. A half-life of (908 ± 400) ns, a spin and parity parity of 10 is defined. Based on the systematicness of the heavier two-odd nuclei ~ (208,210) At-level structures, the 10 ~ -isotropic states of ~ (206) At are discussed.