阿根廷布宜诺斯艾利斯大学C. D. Archubi团队研究了等离子体离子对带电粒子穿越热等离子体的阻止能力和能量离散的影响。2025年4月1日出版的《物理评论A》杂志发表了这项成果。

在等离子体中移动的带电测试粒子会受到与等离子体粒子碰撞的影响。这些相互作用的影响可以用两个主要的能量损失参数来描述，即停止功率和能量损失离散；这些是表征外部粒子与等离子体相互作用的主要参数。

研究组对氢同位素、α粒子、正电子和μ子穿越不同类型的等离子体（托卡马克等离子体、巨星的稠密氦区和太阳内部）的停止和离散的离子和电子贡献进行了比较研究。为了计算这些参数，他们应用量子方法来描述带电粒子与等离子体的相互作用，该方法基于量子介电等离子体模型的一侧，其中包括对能量交换过程的统计效应的完整描述以及对电子激发的量子处理。

此外，研究组通过半经典介电函数结合了等离子体离子的效应，该函数将等离子体电子的量子描述与等离子体离子的经典介电模型相结合。通过各种例子，他们分析了质子、正电子和μ子对阻止能力和能量离散的部分（电子和离子）和全部贡献。这些案例之间的比较提供了对统计波动和离子对每种粒子和不同等离子体介质的能量损失过程的影响的见解。

附：英文原文

Title: Influence of plasma ions on the stopping power and the energy straggling of charged particles traversing hot plasmas

Author: C. D. Archubi, N. R. Arista

Issue&Volume: 2025/04/01

Abstract: A charged test particle moving through a plasma suffers the effects of collisions with the plasma particles. The effects of these interactions may be described in terms of the two main energy-loss parameters, namely, the stopping power and the energy-loss straggling; these are the main parameters that characterize the interaction of external particles with the plasma. Here we perform a comparative study of the ionic and electronic contributions to the stopping and the straggling for the hydrogen isotopes, alpha particles, positrons, and muons, traversing different types of plasmas: tokamak plasmas, the dense helium region of a giant star, and the solar interior. To calculate these parameters we apply a quantum approach to describe the interaction of charged particles with plasmas, based on one side on the quantum dielectric plasma model, which includes a full description of statistical effects on energy exchange processes together with a quantum treatment of electron excitations. In addition, we incorporate the effect of the plasma ions through a semiclassical dielectric function that combines a quantum description of plasma electrons with a classical dielectric model for plasma ions. Through various examples we analyze the partial (electronic and ionic) and total contributions to the stopping power and energy straggling for protons, positrons, and muons. The comparison between these cases provides insights into the effects of statistical fluctuations and ionic contributions to the energy-loss processes for each of these particles and different plasma media.

DOI: 10.1103/PhysRevA.111.042801

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.042801