Opportunities for production and property research of neutron-rich nuclei around N = 126 at HIAF

IF 3.6 1区 物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY
Shao-Bo Ma, Li-Na Sheng, Xue-Heng Zhang, Shi-Tao Wang, Kai-Long Wang, Chun-Wang Ma, Hool-Jin Ong, Zhi-Yu Sun, Shu-Wen Tang, Yu-Hong Yu, Xin-Tong Du, Xiao-Bao Wei
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Abstract

The study of nuclide production and its properties in the \({N}=126\) neutron-rich region is prevalent in nuclear physics and astrophysics research. The upcoming High-energy FRagment Separator (HFRS) at the High-Intensity heavy-ion Accelerator Facility (HIAF), an in-flight separator at relativistic energies, is characterized by high beam intensity, large ion-optical acceptance, high magnetic rigidity, and high momentum resolution power. This provides an opportunity to study the production and properties of neutron-rich nuclei around \({N}=126\). In this paper, an experimental scheme is proposed to produce neutron-rich nuclei around \({N}=126\) and simultaneously measure their mass and lifetime based on the HFRS separator; the feasibility of this scheme is evaluated through simulations. The results show that under the high-resolution optical mode, many new neutron-rich nuclei approaching the r-process abundance peak around \({A}=195\) can be produced for the first time, and many nuclei with unknown masses and lifetimes can be produced with high statistics. Using the time-of-flight corrected by the measured dispersive position and energy loss information, the cocktails produced from \({}^{208}\)Pb fragmentation can be unambiguously identified. Moreover, the masses of some neutron-rich nuclei near \({N}=126\) can be measured with high precision using the time-of-flight magnetic rigidity technique. This indicates that the HIAF-HFRS facility has the potential for the production and property research of neutron-rich nuclei around \({N}=126\), which is of great significance for expanding the chart of nuclides, developing nuclear theories, and understanding the origin of heavy elements in the universe.

Abstract Image

在 HIAF 进行 N = 126 附近富中子核的生产和性质研究的机会
在核物理和天体物理学研究中,对中子富集区({N}=126\)的核素产生及其特性的研究非常普遍。即将在高强度重离子加速器设施(HIAF)上安装的高能碎片分离器(HFRS)是一个相对论能量的飞行中分离器,具有束流强度高、离子光学接受度大、磁刚度高和动量分辨能力强等特点。这为研究\({N}=126\)附近富中子核的产生和性质提供了机会。本文提出了一种在 \({N}=126\) 附近产生富中子核并同时测量其质量和寿命的基于高分辨率磁共振分离器的实验方案;并通过模拟评估了该方案的可行性。结果表明,在高分辨率光学模式下,可以首次产生许多接近r过程丰度峰的({A}=195)附近的新富中子原子核,并且可以以高统计量产生许多质量和寿命未知的原子核。利用测量到的色散位置和能量损失信息对飞行时间进行校正,可以明确地识别由 \({}^{208}\)Pb 碎片产生的鸡尾酒。此外,利用飞行时间磁刚度技术,还可以高精度地测量出\({N}=126\)附近一些富中子原子核的质量。这表明HIAF-HFRS设施具有生产和研究({N}=126)附近富中子核的潜力,对拓展核素谱图、发展核理论、了解宇宙重元素起源具有重要意义。
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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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