Quadrupole and octupole collectivity in the semi-magic nucleus 80206 Hg126
Quadrupole and octupole collectivity in the semi-magic nucleus 80206 Hg126
复制标题
半魔核80206 Hg126中的四极和八极集体
DOI：
10.1016/j.physletb.2023.137675
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发表时间：
2023
影响因子：
4.4
通讯作者：
Boukhari, A.
中科院分区：
文献类型：
--
作者：
Morrison, L.;Hadyńska-Klȩk, K.;Podolyák, Zs.;Gaffney, L.P.;Zielińska, M.;Brown, B.A.;Grawe, H.;Stevenson, P.D.;Berry, T.;Boukhari, A.
首次对放射性、半魔法、两个质子空穴核 206 Hg 进行低能库仑激发测量是在 CERN 最近投入使用的 HIE-ISOLDE 设施中进行的。观测到 206 Hg 中的两束 γ 射线使低洼态数量减少。根据数据，确定了降低的转变强度 B (E 2; 2 1+→ 0 1+)= 4.4 (6) Wu，这是 208 Pb 以南 N= 126 核的第一个此类值，发现该值略低于壳模型计算的预测值。此外，在 2705 keV 的激发能量下发现了集体八极态，并提取了 30− 13+ 10 Wu 的简化 B (E 3) 跃迁概率。这些结果对于理解最重双幻核 208 Pb 附近的四极和八极集体以及对这一关键区域的许多理论方法进行基准测试至关重要。鉴于该区域过渡强度数据的缺乏，这一点尤为重要，原则上，这些数据可用于测试与天体物理 r 过程相关的计算。
The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus 206 Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two γ rays depopulating low-lying states in 206 Hg were observed. From the data, a reduced transition strength B (E 2; 2 1+→ 0 1+)= 4.4 (6) Wu was determined, the first such value for an N= 126 nucleus south of 208 Pb, which is found to be slightly lower than that predicted by shell-model calculations. In addition, a collective octupole state was identified at an excitation energy of 2705 keV, for which a reduced B (E 3) transition probability of 30− 13+ 10 Wu was extracted. These results are crucial for understanding both quadrupole and octupole collectivity in the vicinity of the heaviest doubly-magic nucleus 208 Pb, and for benchmarking a number of theoretical approaches in this key region. This is of particular importance given the paucity of data on transition strengths in this region, which could be used, in principle, to test calculations relevant to the astrophysical r-process.