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

Understand

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.