用于不稳定核性质研究的激光共振电离技术  

Laser resonance ionization techniques for studying the properties of unstable nuclei

作　　者：胡晗睿 郭洋帆 杨晓菲 白世伟 HU Hanrui;GUO Yangfan;YANG Xiaofei;BAI Shiwei(School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China)

机构地区：[1]北京大学物理学院和核物理与核技术国家重点实验室,北京100871

出　　处：《核技术》2023年第8期155-165,共11页Nuclear Techniques

基　　金：国家自然科学基金(No.12027809,No.U1967201,No.11961141003);国家重点研发计划(No.2022YFA1604800);北京大学核物理与核技术国家重点实验室(No.NPT2020KFY17)资助。

摘　　要：不稳定原子核的基本性质反映了核的内在结构和有效相互作用,可用于研究不稳定核的奇特结构。激光核谱技术通过测量核外电子光谱的超精细结构和同位素移位,可以核模型无关地提取原子核的多个基本性质,是研究不稳定核性质和结构的有力工具之一。多步激光共振电离方法是测量原子或离子超精细结构和同位素移位的方法之一。基于此,国际上发展了多种共振电离谱实验技术,用于放射性核束装置上开展不稳定核基本性质和结构研究。本文首先介绍了激光共振电离方法,以及由此发展的各种共振电离激光谱实验技术。随后详细讨论了近十年来刚发展起来的共线共振电离谱技术。此技术可同时实现超精细结构谱的高分辨和高灵敏度测量,正在核素版图大质量范围内的不稳定核性质和结构研究中发挥重要作用。最后分析了用于国内放射性核束装置的共振电离激光谱技术的发展现状及应用前景。The fundamental properties of unstable nuclei are highly related to the nuclear structure and effective nucleon-nucleon interaction,and they can be used to study various exotic structures of unstable nuclei.Laser spectroscopy is a powerful tool used to study nuclear properties and structure by probing the hyperfine structure and isotope shift of the corresponding atoms or ions,from which the nuclear properties can be extracted in a nuclear model-independent manner.Multi-step laser resonance ionization spectroscopy(RIS)can be used to measure the atomic or ionic hyperfine structure.Based on this approach,various experimental techniques have been developed at radioactive ion beam(RIB)facilities worldwide to study the nuclear properties and structure of atomic nuclei.In this paper,the RIS approaches and relevant RIS experimental techniques are first introduced.Subsequently,the recentlydeveloped collinear resonance ionization spectroscopy experimental technique,which can be used to measure the atomic or ionic hyperfine structure spectrum with a high-resolution and high sensitivity and plays an important role in the study of the nuclear properties and structure of unstable nuclei in the large mass regions of nuclear charts,is discussed in detail.Finally,the development status of RIS and its application in domestic RIB facilities are discussed.

关 键 词：不稳定原子核 超精细结构 激光共振电离 激光谱技术 

分 类 号：TL99[核科学技术—核技术及应用]