标题： CDEX-1 1千克点接触锗探测器用于低质量暗物质搜寻 显示英文标题

标题： The CDEX-1 1 kg Point-Contact Germanium Detector for Low Mass Dark Matter Searches

摘要： CDEX合作组成立于中国锦屏地下实验室（CJPL），旨在利用超低能量阈值的p型点接触锗探测器直接探测轻质量暗物质粒子。 首个能量阈值低于keV的1千克点接触锗探测器已经在CJPL的被动屏蔽系统中完成测试。 点接触p+电极和外部n+电极的输出使得探测低于1千电子伏特的低能区成为可能，同时也能探测高达3兆电子伏特的高能区。 p+和n+电极的输出也可能为暗物质实验提供一种更有力的信号甄别方法。 包括能量分辨率、死时间、内部X射线衰变时间以及系统稳定性在内的若干关键参数已经过测试和测量。 结果显示，该1千克点接触锗探测器与其屏蔽系统和电子设备可以平稳运行并表现出良好的性能。 该探测器系统将被用于暗物质搜寻实验。 显示英文摘要

摘要： The CDEX Collaboration has been established for direct detection of light dark matter particles, using ultra-low energy threshold p-type point-contact germanium detectors, in China JinPing underground Laboratory (CJPL). The first 1 kg point-contact germanium detector with a sub-keV energy threshold has been tested in a passive shielding system located in CJPL. The outputs from both the point-contact p+ electrode and the outside n+ electrode make it possible to scan the lower energy range of less than 1 keV and at the same time to detect the higher energy range up to 3 MeV. The outputs from both p+ and n+ electrode may also provide a more powerful method for signal discrimination for dark matter experiment. Some key parameters, including energy resolution, dead time, decay times of internal X-rays, and system stability, have been tested and measured. The results show that the 1 kg point-contact germanium detector, together with its shielding system and electronics, can run smoothly with good performances. This detector system will be deployed for dark matter search experiments.