Constraints on spin-independent nucleus scattering with sub-GeV WIMP dark matter from the CDEX-1B Experiment at CJPL
2019
We report results on the searches of
weakly interacting massive particles(
WIMPs) with sub-GeV masses ($m_{\chi}$) via
WIMP-nucleus spin-independent scattering with Migdal effects and
bremsstrahlungemissions incorporated. Analysis on time-integrated (TI) and annual modulation (AM) effects on CDEX-1B data are performed, with 737.1 kg$\cdot$day exposure and 160 eVee threshold for TI analysis, 1107.5 kg$\cdot$day exposure and 250 eVee threshold for AM analysis. The sensitive windows in $m_{\chi}$ are expanded by an order of magnitude. New limits on $\sigma_{\chi N}^{\rm SI}$ at 90\% confidence level at $m_{\chi}\sim$ 0.05$-$0.18 GeV/$c^2$ and 0.075$-$3.0 GeV/$c^2$ in the TI and AM analysis are derived, respectively.
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