标题： 太阳中微子在氙探测器中的低能电子反冲 显示英文标题

标题： Low-energy electronic recoil in xenon detectors by solar neutrinos

摘要： 低能电子反冲是由太阳中微子在吨级氙探测器中引起的，这不仅是因为它是直接搜索弱相互作用大质量粒子（WIMPs）的不可减少背景的一个来源，而且因为它提供了一种可行的方法来以当前标准太阳模型预测的精度水平测量太阳$pp$和$^{7}\textrm{Be}$中微子。 在这项工作中，我们对氙的结构、光致电离和中微子电离进行了$\textit{ab initio}$的多体计算。 发现原子结合效应在低反冲能量下对中微子-电子散射截面产生显著的抑制。 与基于自由电子图象的先前计算相比，我们在相同探测器配置下的电子反冲事件率减少了约$25\%$。 本文给出了在 100 eV - 30 keV 能量窗口内，以每吨每年为标准的氙探测器的电子反冲率谱，并讨论了其在低能太阳中微子探测（作为信号）和 WIMP 搜索（作为背景源）中的意义。 显示英文摘要

摘要： Low-energy electronic recoil caused by solar neutrinos in multi-ton xenon detectors is an important subject not only because it is a source of the irreducible background for direct searches of weakly-interacting massive particles (WIMPs), but also because it provides a viable way to measure the solar $pp$ and $^{7}\textrm{Be}$ neutrinos at the precision level of current standard solar model predictions. In this work we perform $\textit{ab initio}$ many-body calculations for the structure, photoionization, and neutrino-ionization of xenon. It is found that the atomic binding effect yields a sizable suppression to the neutrino-electron scattering cross section at low recoil energies. Compared with the previous calculation based on the free electron picture, our calculated event rate of electronic recoil in the same detector configuration is reduced by about $25\%$. We present in this paper the electronic recoil rate spectrum in the energy window of 100 eV - 30 keV with the standard per ton per year normalization for xenon detectors, and discuss its implication for low energy solar neutrino detection (as the signal) and WIMP search (as a source of background).