高纯锗探测器10keV以下反冲核淬灭因子实验研究

The high purity germanium detector is an important detector for the direct detection of low-mass dark matter. Due to the existence of quenching effect, the energy of the nuclear recoil measured by the high purity germanium detector is not equal to the real recoil nuclear energy. Therefore, it is very important to study the corresponding relationship between the nuclear recoil energy and the visible energy measured by the high purity germanium detector. This project will establish a high purity germanium quenching factor measurement system based on low threshold and high energy resolution high purity germanium detector. This project will use accelerator neutron sources to measure the quenching factor at the recoil energy below 10keV, and provides more precise quenching factor measurement result for direct detection of dark matter as well as more information for theoretical analysis of quenching effect at low energy zone.

高纯锗探测器是进行低质量暗物质直接探测的重要探测器。由于淬灭效应的存在，高纯锗探测器测量到的核反冲事例能量在数值上并不等于反冲核能量，因此对高纯锗探测器核反冲能量与其可见能量之间对应关系的研究与精确测量是非常重要的。本项目将基于低阈值、高能量分辨率的高纯锗探测器，建立一套高纯锗淬灭因子测量系统。使用加速器中子源对锗晶体10keV以下反冲核的淬灭因子进行测量,为高纯锗暗物质直接探测实验物理分析提供更加精确的淬灭因子修正数据，并为低能区淬灭效应的理论分析提供更多的参考和依据。