^(80)Rb的旋称劈裂反转及负宇称带的回弯

Signature Splitting and Inversion and Back Bending in Negative Sideband in ^(80)Rb

通过熔合蒸发反应65Cu + 19F ,66Zn + 18O及68Zn + 16O ,在 3种入射束流的能量分别为 75MeV ,76MeV及 80MeV研究了80 Rb高自旋态的能级结构 .增加了 2 0多条新的γ跃迁 ,在已知负宇称转晕带上建立了两条新的边带 .将原有的第二条负宇称带的自旋态从 12 -推高到了 2 2 - ,并首次观察到这个带的回弯 ,它的回弯频率为 0 .4 9MeV ;负宇称转晕带在 15 -时出现了旋称反转 ,第二负宇称带存在明显的旋称劈裂 ,但没有观察到旋称反转 ,这两条负宇称带的结构均与其同中子数核82

High spin states of 80Rb have been studied by using fusion evaporation reactions, 65Cu+ 19F, 66Zn+ 18O and 68Zn+ 16O with beam energies of 75MeV, 76MeV and 80MeV, respectively, at HI-13 Tandem accelerator Beijing and JAERI Japan. γ-γ coincidence and DCO ratios were measured by the HPGe detector systems. About twenty new γ transitions are added to the previously proposed level schema from the present experiments. The second negative band is pushed up from 12 - to 22 -. Abackbending at frequency of 0.49MeV is observed. Evidence has also been found for two hitherto unknown sidebands built on the negative yrast band. Signature splitting in both negative bands is observed. Signature inversion occurs only in the yrast negative band at spin of 15 and it is close to that of 82Y. The plots of [E(I)-E(I-1)]/(2I) vs I are given and compared with its isotones 78Br and 82Y as well as its isotopes 76Rb and 78Rb.