分类: 物理学 >> 核物理学 提交时间: 2025-05-06
摘要: The technique of Bρ-defined isochronous mass spectrometry (Bρ-IMS), established at a storage ring, serves as a valuable tool for determining the masses of short-lived nuclei. In the previous Bρ-IMS experiments, the effects of magnetic field drifts have to be corrected in order to improve the mass resolving power of Bρ-IMS [Eur. Phys. J. A 59, 27 (2023)]. The correction procedures are complicated and require multiple reference ions with well-known masses in each injection, which may not be the cases in the measurements of exotic nuclei with tiny production yields. In this study, we propose a novel approach of Bρ-IMS that requires only one reference ion for mass determination in an individual injection, avoiding the tedious and complicated correction procedures. This approach achieves the mass precision comparable to that of previous Bρ-IMS results, and is approved to be suitable for future mass measurements of exotic nuclei with extremely low production yields.
分类: 物理学 >> 核物理学 提交时间: 2023-12-06
摘要: 通过重离子熔合蒸发反应82Se(18O,p5n)94Nb,布居了94Nb的高自旋态,实验中使用的18O束流由中国原子能科学研究院的HI-13串列加速器提供,束流能量为82MeV和88MeV。在前人工作的基础上发现了15条新的跃迁并调整了部分能级的摆放位置,丰富并完善了94Nb的能级纲图,结合DC0比值和线极化测量,确认了部分能级的自旋和宇称。在质子(1f5/2, 2p3/2, 2p1/2, 1g9/2)和中子(2p1/2, 1g9/2, 1g7/2, 2d5/2)空间下对94Nb新的能级结构与壳模型计算进行了比较和讨论。
分类: 物理学 >> 核物理学 提交时间: 2023-11-03
摘要: 重锕系核弹靶组合的多核子转移反应可能是产生丰中子超重核的重要突破口,因此设计建造适用于多核子转移反应的丰中子超重核研究的原理性谱仪不仅可以为探索超重核稳定岛奠定技术、方法和装置基础,而且对研究多核子转移反应机制有重要意义。丰中子超重核研究原理性谱仪中的气体单元需要持续不断的高纯度氦气,以停阻多核子转移反应产物并将降能后的离子引出到后续的实验装置。论文主要介绍新研制的丰中子超重核研究原理性谱仪的气体单元低温纯化系统,此系统主要为谱仪提供可循环的高纯度氦气。经实验测定,低温纯化系统可以将99%的氦气纯化到99.999%以上,结合化学纯化单元,纯化后的氦气满足气体单元对高纯度氦气的需求。