Exotic Dark Matter Search with the CDEX-10 Experiment at China's Jinping Underground Laboratory

Abstract

A search for exotic dark matter (DM) in the sub-GeV mass range has been conducted using 205 kg day data taken from a p-type point contact germanium detector of the CDEX-10 experiment at China's Jinping underground laboratory. New low-mass dark matter searching channels, neutral current fermionic DM absorption (?+A+A) and DM-nucleus 3?2 scattering (?+?+A+A), have been analyzed with an energy threshold of 160 eVee. No significant signal was found; thus new limits on the DM-nucleon interaction cross section are set for both models at the sub-GeV DM mass region. A cross section limit for the fermionic DM absorption is set to be 2.5×10-46 cm2 (90% C.L.) at DM mass of 10 MeV/c2. For the DM-nucleus 3?2 scattering scenario, limits are extended to DM mass of 5 and 14 MeV/c2 for the massless dark photon and bound DM final state, respectively. © 2022 authors. Published by the American Physical Society.