奇奇核^(170)Ta高自旋态及旋称反转研究

Study on the High-Spin States and Signature Inversion of Odd-Odd Nucleus ^(170) Ta

用 97MeV的1 9F束通过1 55Gd( 1 9F ,4n) 1 70 Ta反应布居了奇奇核1 70 Ta的高自旋态 ,将1 70 Ta的 3个转动带推向了更高的自旋态 ,并观测到了半退耦带的旋称反转点 ,将其自旋值定在了 1 9.5 .首次比较系统地总结了稀土区半退耦带的旋称反转系统规律 ,并比较了该核区半退耦带与晕带的系统性差异 ,特别是这两个带在能量劈裂程度上存在着系统性差异 .从这一现象出发 ,探讨了半退耦带与晕带旋称反转系统性差异的成因 ,指出p n剩余相互作用在这一现象中起着非常重要的作用 .

The high spin states of odd odd nucleus 170 Ta were populated via the 155 Gd( 19 F,4n) 170 Ta reaction with beam energy of 97 MeV provided by the HI 13 tandem accelerator of China Institute of Atomic Energy. Three rotational bands have been pushed to higher spin states and the signature inversion point of the semidecoupled band based on the π h 9/2 1/2 -ν i 13/2 configuration has been observed to be 19.5  . The systematic features of the signature inversion in semidecoupled bands in odd odd rare earth nuclei were summarized. The systematic differences of signature inversion, especially the difference in the energy splitting between the yrast bands and the semidecoupled bands in odd odd rare earth nuclei are pointed out and discussed for the first time. It seems that p n interaction between the odd proton and odd neutron in the odd odd nuclei plays an important role.