Journal
CHINESE PHYSICS C
Volume 37, Issue 12, Pages -Publisher
CHINESE PHYSICAL SOC
DOI: 10.1088/1674-1137/37/12/126002
Keywords
CDEX; point-contact germanium detector; dark matter; CJPL
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Funding
- National Natural Science Foundation of China [10935005, 10945002, 11275107, 11175099]
- National Basic Research Program of China (973 Program) [2010CB833006]
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The CDEX collaboration has been established for direct detection of light dark matter particles using ultra-low energy threshold point-contact p-type 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.
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