134Cs中负宇称高自旋态的首次观测和奇奇Cs同位素中可能的手性边界

IF 4.5 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
H. Wang , K.Y. Ma , D. Zhao , J.Y. Li , H.Y. Ye , X.J. Zhao , Y.C. Hao , Z. Qiao , J.X. Teng , K.S. Su , X.R. Zhao , Z.H. Zhao , H.C. Zhang , Y.K. Pan , Y.J. Ma , J.B. Lu , Y. Zheng , C.B. Li , T.X. Li , X.G. Wu , Y.Q. Li
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引用次数: 0

摘要

利用反应130Te(7Li, 3n)134Cs首次报道了富中子铯同位素134Cs中的负宇称高自旋态。先前已知的134Cs能级方案被大大扩展,增加了50多个新的γ跃迁。在粒子转子模型计算的支持下,我们观察到两个具有π(g7/2,d5/2)⊗νh11/2构型的负宇称带,并提出了它们作为赝自旋伙伴带。在134Cs中发现了一对基于πh11/2⊗νh11/2构型的近简并正宇称带,并解释为手性双偶带,这是A≈130质量区内第一个手性富中子核。同时,134Cs也是目前Cs同位素中手性最重的核,这意味着在接近N = 82时,134Cs可能是奇奇Cs同位素中手性核的边界。此外,还观察到连接正负宇称带的电偶极子跃迁,表明134Cs中可能存在八极子相关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
First observation of negative-parity high-spin states in 134Cs and possible boundary of chirality in odd-odd Cs isotopes
Negative-parity high-spin states in neutron-rich cesium isotope 134Cs are reported for the first time using the reaction 130Te(7Li, 3n)134Cs. The previously known level scheme of 134Cs is considerably extended with the addition of more than 50 new γ transitions. Two negative-parity bands are observed and proposed as pseudospin partner bands with π(g7/2,d5/2)νh11/2 configurations, supported by particle rotor model calculations. A pair of nearly degenerate positive-parity bands based on πh11/2νh11/2 configuration are identified and interpreted as chiral doublet bands in 134Cs, which is the first chiral neutron-rich nucleus in the A130 mass region. Meanwhile, 134Cs is also currently the heaviest nucleus with chirality among Cs isotopes, meaning that it may be the boundary of the chiral nuclei in the odd-odd Cs isotopes while approaching N = 82. In addition, the electric dipole transitions linking the positive- and negative-parity bands are observed, suggesting the possible presence of octupole correlations in 134Cs.
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来源期刊
Physics Letters B
Physics Letters B 物理-物理:综合
CiteScore
9.10
自引率
6.80%
发文量
647
审稿时长
3 months
期刊介绍: Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.
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