Mirror energy differences above the 0f7/2 shell: First ?-ray spectroscopy of the T = -2 nucleus 56Zn
Mirror energy differences above the 0f7/2 shell: First ?-ray spectroscopy of the T = -2 nucleus 56Zn
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0f7/2 壳层上方的镜像能量差异：T = -2 核 56Zn 的第一个 γ 射线光谱
DOI：
10.1016/j.physletb.2021.136784
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发表时间：
2021
影响因子：
4.4
通讯作者：
Fernández A
中科院分区：
文献类型：
--
作者：
Fernández A
在 RIKEN 放射性同位素束工厂进行的一项实验中，57 Zn 束以中间能量撞击 Be 靶材，除去一个中子后，56 Zn 中的激发态就出现了。观测到 3 条 γ 射线，初步归属于 6+→ 4+→ 2+→ 0+ yrast 序列。这将 56 Zn 转变为最重的 T z=− 2 核，其中激发态是已知的。这些能级与 T z=+ 2 镜像伙伴 56 Fe 中的同量异位类似态之间的激发能差异与考虑完整 pf 价空间和各种同位旋破坏贡献的大规模壳模型计算进行了比较。这种比较，连同对 A= 58、T z=±1 对 58 Zn 和 58 Ni 中镜像能量差异的分析，提供了有关双幻 56 Ni 上方区域中单极径向和等矢量多极同位自旋破坏项大小的有价值的信息。
Excited states in 56 Zn were populated following one-neutron removal from a 57 Zn beam impinging on a Be target at intermediate energies in an experiment conducted at the Radioactive Isotope Beam Factory at RIKEN. Three γ rays were observed and tentatively assigned to the 6+→ 4+→ 2+→ 0+ yrast sequence. This turns 56 Zn into the heaviest T z=− 2 nucleus in which excited states are known. The excitation-energy differences between these levels and the isobaric analogue states in the T z=+ 2 mirror partner, 56 Fe, are compared with large-scale shell-model calculations considering the full pf valence space and various isospin-breaking contributions. This comparison, together with an analysis of the mirror energy differences in the A= 58, T z=±1 pair 58 Zn and 58 Ni, provides valuable information with respect to the size of the monopole radial and the isovector multipole isospin-breaking terms in the region above doubly-magic 56 Ni.