Phys. Rev. D 90, 032003 (2014) - Limits on light WIMPs with a germanium detector at 177 eVee threshold at the China Jinping Underground Laboratory

Limits on light WIMPs with a germanium detector at 177 eVee threshold at the China Jinping Underground Laboratory

S. K. Liu et al. (CDEX Collaboration)

Phys. Rev. D 90, 032003 – Published 11 August 2014

Abstract

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.