【摘要】 通过重离子核反应与在束γ谱的实验技术,对A=130缺中子核区的双奇核¹³⁶La的高自旋态进行了研究,所用核反应为¹³⁰Te(¹¹B,5n)。实验结果扩展了¹³⁶La的能级纲图,包括3个集体转动带,最高自旋态达20h。对于πh_11/2vh_11/2带,观测到了旋称反转与集体回弯现象。通过系统学比较,对旋称反转特性进行了讨论。由推转壳模型的计算指出,此集体回弯是由一对中子的角动量顺排引起的。另外两个集体带为具有γ≈-60°的扁椭形变带,其可能的组态为:πh_11/2vg_7/2h_11/2²与πg_7/2vg_7/2²d_5/2h_11/2²。更多还原

【Abstract】 Using heavy-ion nuclear reaction and in-beam 7-ray spectroscopy technique, high spin states of ¹³⁶La have been studied. The nuclear reaction used is ¹³⁰Te(¹¹B, 5n) with a beam energy 60MeV. The level scheme with three collective band structures has been updated with spin up to 20h. The collective backbending has been observed in πh_11/2 vh_11/2 band. According to the TRS calculations, this backbending is due to the alignment of a pair of h_11/2 neutrons. The signature splitting and inversion for the πh_11/2 vh_11/2 band were also discussed. Other two bands based on 12^- and 16⁺ levels were proposed as oblate deformation with γ≈-60°. They most probably originate from four and six- quasiparticle configurations, that is, πh_11/2 vg_7/2h_11/2² and πg_7/2 vg_7/2² d_5/2h_11/2² respectively.更多还原