Diversity of shapes and rotations in the gamma-soft Ba-130 nucleus: First observation of a t-band in the A=130 mass region
Diversity of shapes and rotations in the gamma-soft Ba-130 nucleus: First observation of a t-band in the A=130 mass region
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伽玛软 Ba-130 核中形状和旋转的多样性：首次观察到 A=130 质量区域中的 t 带
DOI：
10.1016/j.physletb.2019.06.040
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发表时间：
2019
影响因子：
4.4
通讯作者：
Riccetto S.
中科院分区：
文献类型：
--
作者：
Petrache C. M.;Walker P. M.;Guo S.;Chen Q. B.;Frauendorf S.;Liu Y. X.;Wyss R. A.;Mengoni D.;Qiang Y. H.;Astier A.;Dupont E.;Li R.;Lv B. F.;Zheng K. K.;Bazzacco D.;Boso A.;Goasduff A.;Recchia F.;Testov D.;Galtarossa F.;Jaworski G.;Napoli D. R.;Riccetto S.
在130Ba中发现了几个新的谱带，其中一个谱带的带头自旋为8+。它的性质与费米排列的νh11/2 2，7/2−[523]⊗9/2−[514]Nilsson构型一致。这是在A=130质量区首次观测到两个准粒子的t带。T带由包含两个额外的h11/2质子的偶极带馈电。还新确定了质子和中子S带的奇自旋对以及高自旋时的基态带。用几种理论模型，全Routhians表面(TRS)，倾斜轴转动(TAC)，粒子转子模型(PRM)和投影壳模型(PSM)讨论了观测到的谱带，这些模型强烈地表明由旋转排列的两质子和两中子组态极化的扁形和扁圆形共存，以及绕不同取向的轴的长形集体旋转。根据新的结果，130BA提供了γ软核在中高自旋时最好和最完整的集体激发之一，揭示了A=130质量区原子核的形状和旋转的多样性。
Several new bands have been identified in 130 Ba, among which there is one with band-head spin 8+. Its properties are in agreement with the Fermi-aligned ν h 11/2 2, 7/2−[523]⊗ 9/2−[514] Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the A= 130 mass region. The t-band is fed by a dipole band involving two additional h 11/2 protons. The odd-spin partners of the proton and neutron S-bands and the ground-state band at high spins are also newly identified. The observed bands are discussed using several theoretical models, total Routhians surfaces (TRS), tilted axis cranking (TAC), particle rotor model (PRM) and projected shell model (PSM), which strongly suggest the coexistence of prolate and oblate shapes polarized by rotation aligned two-proton and two-neutron configurations, as well as prolate collective rotations around axes with different orientations. With the new results, 130 Ba presents one of the best and most complete sets of collective excitations that a γ-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the A= 130 mass region.