Investigating the level structure of 206Rn: evolution from seniority regime to collective dynamics

Rui Guo, Lihua Zhu, Jingbin Lu, G. Fu, meng(萌) Wang(王), B. Sun, G. Zhang, Zhen(臻) Ren(任), Yi Heng Wu, Yun Zheng, Chuang-Ye 贺创业 He, Jin-Long Wang, Xiaoguang Wu, Shun He(顺和) Yao(姚)
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Abstract

Excited states of 206Rn have been studied via the 197Au(14N, 5n)206Rn fusion reaction at a beam energy of 78 MeV. A number of transitions and levels are identified by the γ-γ coincidence measurement, further enriching the level scheme of 206Rn. Both the full configuration shell model and the nucleon-pair approximation (NPA) were utilized to investigate the single-particle configurations and seniority structures in 206Rn. The results of these two calculations suggest that the 21 + and 41 + states exhibit only a 50% component of a seniority-two state associated with a broken neutron pair. The collectivity of these two states primarily arises from configuration mixing due to residual proton-neutron interactions. The 61 + and 81 + states are predominantly characterized by a seniority-two state marked by a broken proton pair.
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调查 206Rn 的级别结构:从资历制度到集体动力的演变
在 78 MeV 的束流能量下,通过 197Au(14N, 5n)206Rn 核聚变反应研究了 206Rn 的激发态。γ-γ巧合测量确定了一些跃迁和水平,进一步丰富了 206Rn 的水平方案。全构型壳模型和核子对近似(NPA)都被用来研究 206Rn 的单粒子构型和高级结构。这两项计算的结果表明,21 + 和 41 + 状态只显示出与中子对破裂相关的资历二状态的 50% 部分。这两个态的集合性主要来自于残余质子-中子相互作用引起的构型混合。61 + 和 81 + 状态的主要特征是以质子对断裂为标志的资历二状态。
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