In-beam γ-ray spectroscopy of 32Mg via direct reactions
In-beam γ-ray spectroscopy of 32Mg via direct reactions
复制标题
通过直接反应进行 32Mg 的束内 γ 射线光谱
DOI：
10.1103/physrevc.105.034318
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发表时间：
2022
影响因子：
3.1
通讯作者：
N. Kitamura et al.,
中科院分区：
文献类型：
--
作者：
Lam Yi Hua;Lu Ning;Heger Alexander;Jacobs Adam Michael;Smirnova Nadezda A.;Nieto Teresa Kurtukian;Johnston Zac;Kubono Shigeru;N. Kitamura et al.,
背景：原子核（和）在所谓的“反转岛”中起着核心作用，在基态壳层中子被提升到壳层轨道穿过壳层间隙，导致正则中子幻数的消失。目的：这项工作的主要目标是扩展的水平计划，提供自旋宇称分配到激发态，并通过与理论计算的比较讨论每个状态的微观结构。方法：在束射线光谱的进行使用两个直接反应探针：一个中子（两个质子）敲除反应（）。结果：由于单中子和双质子敲除反应具有显著的选择性，我们构造了一个更新的能级方案，它包含了负宇称入侵态和正宇称正常态。实验结果与四种不同的原子核结构模型进行了比较，结论：在这些模型中，有些模型很好地描述了原子核结构的不同方面以及原子核向反转岛的转变。然而，仍然存在无法解释的差异，即使在这些最先进的理论方法的帮助下，这个关键核心的结构也尚未完全捕获。
Background:The nucleus(and) plays a central role in the so-called “island of inversion,” where in the ground states-shell neutrons are promoted to the-shell orbitals across the shell gap, resulting in the disappearance of the canonical neutron magic number.Purpose:The primary goals of this work are to extend the level scheme of, provide spin-parity assignments to excited states, and discuss the microscopic structure of each state through comparisons with theoretical calculations.Method:In-beam-ray spectroscopy ofwas performed using two direct-reaction probes: one-neutron (two-proton) knockout reactions on(). Final-state exclusive cross sections and parallel momentum distributions were extracted from the experimental data and compared with eikonal-based reaction model calculations combined with shell-model overlap functions.Results:Owing to the remarkable selectivity of the one-neutron and two-proton knockout reactions, a significantly updated level scheme for, which exhibits negative-parity intruder and positive-parity normal states, was constructed. The experimental results were confronted with four different nuclear structure models.Conclusions:In some of these models, different aspects ofand the transition into the island of inversion are well described. However, unexplained discrepancies remain, and, even with the help of these state-of-the-art theoretical approaches, the structure of this key nucleus is not yet fully captured.