S. K. Liu, Q. Yue, K. J. Kang et al.
Limits on light WIMPs with a germanium detector at 177 eVee threshold at the China Jinping Underground Laboratory

Phys. Rev. D 90, 032003 (2014)

The China Dark Matter Experiment reports results on light WIMP dark matter searches at the China Jinping Underground Laboratory with a germanium detector array with a total mass of 20 g. The physics threshold achieved is 177 eVee (“ee” represents electron equivalent energy) at 50% signal efficiency. With 0.784 kg-days of data, exclusion region on spin-independent coupling with the nucleon is derived, improving over our earlier bounds at WIMP mass less than 4.6 GeV.