【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。主要介绍新研制的丰中子超重核研究原理性谱仪气体单元低温纯化系统,此系统主要为气体单元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。更多还原

【Abstract】 Multinucleon transfer reactions involving heavy actinide projectile and target nuclei hold significant potential as a groundbreaking method to synthesize neutron-rich superheavy nuclei.Constructing a Prototype Spectrometer for Neutron-rich Superheavy Nuclei is highly desirable to establish the technical,methodological,and device foundation to explore the stability island in superheavy nuclei and to study the mechanism of multinucleon transfer reactions.The gas cell of the Prototype Spectrometer for Neutron-rich Superheavy Nuclei requires a continuous supply of high-purity helium gas to stop the energetic radioactive reaction products and to extract the energy-reduced ions to the subsequent expenmental setup.The paper focuses on a newly developed Gas Cell Cryogenic Purification System operating at Prototype Spectrometer for Neutron-rich Superheavy Nuclei.This system is designed to provide recyclable and high-purity helium for the gas cell.With a series of tests,the cryogenic purification system has been proven to be able to purify the 99% helium gas to 99.999% or higher,fulfilling the requirements of the gas cell when used in conjunction with the chemical purification system.更多还原