Precise predictions and new insights for atomic ionization from the Migdal effect
Precise predictions and new insights for atomic ionization from the Migdal effect
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米格达尔效应中原子电离的精确预测和新见解
DOI：
10.1103/physrevd.107.035032
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发表时间：
2022-08
影响因子：
5
通讯作者：
P. Cox;M. Dolan;C. McCabe;H. Quiney
中科院分区：
文献类型：
--
作者：
P. Cox;M. Dolan;C. McCabe;H. Quiney
中性粒子被原子核散射会导致电子电离和激发，这一过程被称为米格达尔效应。我们回顾和改进以前的计算Migdal效应，使用Dirac-Hartree-Fock方法计算原子波函数。我们的方法不依赖于偶极近似的使用，使我们能够提出更高的核反冲速度比以前可能的强大的结果。我们的计算为未来使用中子源测量Migdal效应提供了理论基础，并在直接探测实验中寻找暗物质。我们表明，多电离必须考虑到在实验中与快中子，并推导出半包容性的概率产生一个硬电子以上的一个定义的能量阈值的过程。我们目前的结果为贵元素，包括氙，以及碳，氟，硅和锗。我们计算的跃迁概率是公开的。
The scattering of neutral particles by an atomic nucleus can lead to electronic ionisation and excitation through a process known as the Migdal effect. We revisit and improve upon previous calculations of the Migdal effect, using the Dirac-Hartree-Fock method to calculate the atomic wavefunctions. Our methods do not rely on the use of the dipole approximation, allowing us to present robust results for higher nuclear recoil velocities than was previously possible. Our calculations provide the theoretical foundations for future measurements of the Migdal effect using neutron sources, and searches for dark matter in direct detection experiments. We show that multiple ionisation must be taken into account in experiments with fast neutrons, and derive the semi-inclusive probability for processes that yield a hard electron above a defined energy threshold. We present results for the noble elements up to and including xenon, as well as carbon, fluorine, silicon and germanium. The transition probabilities from our calculations are publicly available.