发表机构
China Institute of Atomic Energy; Yalong River Hydropower Development Company, Ltd; Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of Sichuan Province（中国原子能科学研究院; 雅砻江流域水电开发有限公司; 四川锦屏深地下前沿科学与暗物质重点实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文采用基于COMSOL的模拟框架，首次表征液氦中keV级α粒子电离径迹的电子逃逸比，发现其约为5.3 MeV径迹的1.5-2.5倍，且逃逸比与离子数密度线性相关。
AI 中文摘要
已有多项实验测量了不同外电场下液氦中5.3 MeV α粒子电离径迹的电子逃逸比，但据我们所知，同介质中keV级α径迹的对应比例尚未见报道。本文首次证明，可采用基于COMSOL的模拟准确表征该比例。我们的模拟框架分两个阶段开发：第一阶段旨在验证模拟结果与已发表的5.3 MeV α粒子实验数据的一致性，该阶段验证成功后，我们进入第二阶段，将5.3 MeV径迹替换为2、5、10 keV径迹。模拟结果显示：(a) keV级径迹的电子逃逸比约为5.3 MeV径迹的1.5至2.5倍；(b) 所有径迹能量（2、5、10 keV及5.3 MeV）的逃逸比均与模拟T0时刻的离子数密度呈线性相关，但与电子数密度无关。
英文摘要
The electron escape ratio for 5.3 MeV alpha-particle ionization tracks in liquid helium under varying external electric fields has been measured in several experiments. However, to the best of our knowledge, the corresponding ratio for keV-scale alpha tracks in the same medium has not yet been reported. In this article, we demonstrate for the first time that this ratio can be accurately characterized using COMSOL-based simulations. Our simulation framework was developed in two stages. In Stage I, we aimed to verify consistency between our simulated results and published experimental data for 5.3 MeV alpha particles. Following successful verification in Stage I, we proceeded to Stage II, in which the 5.3 MeV track was replaced by 2, 5, and 10 keV tracks. Our simulated results reveal that (a) keV-scale tracks exhibit electron escape ratios approximately 1.5-2.5 times higher than that of the 5.3 MeV track, and (b) the escape ratios for all track energies (2, 5, 10 keV, and 5.3 MeV) exhibit a linear dependence on the ion number density at the simulation's T0, but not on the electron number density.
