Structure and 2p decay mechanism of 18Mg

IF 3.6 1区 物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Science and Techniques Pub Date : 2024-06-26 DOI:10.1007/s41365-024-01479-1
Long Zhou, De-Qing Fang, Si-Min Wang, Hui Hua
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Abstract

The recently discovered, extremely proton-rich nuclide \(^{18}\)Mg exhibits ground-state decay via two sequential two-proton (2p) emissions through the intermediate nucleus, \(^{16}\)Ne. This study investigates the structure and the initial 2p decay mechanism of \(^{18}\textrm{Mg}\) by examining the density and correlations of the valence protons using a three-body Gamow coupled-channel method. The results show that the ground state of \(^{18}\textrm{Mg}\) is significantly influenced by the continuum, resulting in a significant s-wave component. However, based on the current framework, this does not lead to a significant deviation in mirror symmetry in either the structure or spectroscopy of the \(^{18}\textrm{Mg}\)\(^{18}\textrm{C}\) pair. Additionally, the time evolution analysis of the \(^{18}\textrm{Mg}\) ground state suggests a simultaneous 2p emission during the first step of decay. The observed nucleon–nucleon correlations align with those of the light-mass 2p emitters, indicating a consistent decay behavior within this nuclear region.

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18Mg 的结构和 2p 衰变机理
最近发现的极富质子的核素((^{18}\)Mg)通过中间核(\(^{16}\)Ne)的两个连续的双质子(2p)发射,表现出基态衰变。本研究通过使用三体伽莫耦合通道方法考察价质子的密度和相关性,研究了\(^{18}\textrm{Mg}\)的结构和初始 2p 衰变机制。结果表明,(^{18}textrm{Mg}/) 的基态受到连续体的显著影响,从而产生了一个重要的 s 波分量。然而,基于当前的框架,这并不会导致\(^{18}textrm{Mg}\)-\(^{18}textrm{C}\)对的结构或光谱出现明显的镜像对称性偏差。此外,对(^{18}textrm{Mg}/)基态的时间演化分析表明,在衰变的第一步,同时存在 2p 发射。观测到的核子-核子相关性与轻质量 2p 发射器的相关性一致,表明在这一核区域内存在一致的衰变行为。
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来源期刊
Nuclear Science and Techniques
Nuclear Science and Techniques 物理-核科学技术
CiteScore
5.10
自引率
39.30%
发文量
141
审稿时长
5 months
期刊介绍: Nuclear Science and Techniques (NST) reports scientific findings, technical advances and important results in the fields of nuclear science and techniques. The aim of this periodical is to stimulate cross-fertilization of knowledge among scientists and engineers working in the fields of nuclear research. Scope covers the following subjects: • Synchrotron radiation applications, beamline technology; • Accelerator, ray technology and applications; • Nuclear chemistry, radiochemistry, radiopharmaceuticals, nuclear medicine; • Nuclear electronics and instrumentation; • Nuclear physics and interdisciplinary research; • Nuclear energy science and engineering.
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