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Dai, W H; Jia, L P; Ma, H; Yue, Q; Kang, K J; Li, Y J; An, H P; C, Greeshma; Chang, J P; Chen, Y H; Cheng, J P; Deng, Z; Fang, C H; Geng, X P; Gong, H; Guo, Q J; Guo, X Y; He, L; He, S M; Hu, J W; Huang, H X; Huang, T C; Jia, H T; Jiang, X; Karmakar, S; Li, H B; Li, J M; Li, J; Li, Q Y; Li, R M J; Li, X Q; Li, Y L; Liang, Y F; Liao, B; Lin, F K; Lin, S T; Liu, S K; Liu, Y D; Liu, Y; Liu, Y Y; Liu, Z Z; Mao, Y C; Nie, Q Y; Ning, J H; Pan, H; Qi, N C; Ren, J; Ruan, X C; She, Z; Singh, M K; Sun, T X; Tang, C J; Tang, W Y; Tian, Y; Wang, G F; Wang, L; Wang, Q; Wang, Y; Wang, Y X; Wong, H T; Wu, S Y; Wu, Y C; Xing, H Y; Xu, R; Xu, Y; Xue, T; Yan, Y L; Yang, L T; Yi, N; Yu, C X; Yu, H J; Yue, J F; Zeng, M; Zeng, Z; Zhang, B T; Zhang, F S; Zhang, L; Zhang, Z H; Zhang, Z Y; Zhao, K K; Zhao, M G; Zhou, J F; Zhou, Z Y; Zhu, J J
Physical review letters, 11/2022, Letnik: 129, Številka: 22Journal Article
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 (χ+A→ν+A) and DM-nucleus 3→2 scattering (χ+χ+A→ϕ+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} cm^{2} (90% C.L.) at DM mass of 10 MeV/c^{2}. For the DM-nucleus 3→2 scattering scenario, limits are extended to DM mass of 5 and 14 MeV/c^{2} for the massless dark photon and bound DM final state, respectively.
