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Limits on Spin-Independent Couplings of WIMP Dark Matter with a p-Type Point-Contact Germanium Detector

Li, H. B.
Liao, H. Y.
Lin, S. T.
Liu, S. K.
Singh, L.
Singh, M. K.
Soma, A. K.
Wong, H. T.
Wu, Y. C.
Zhao, W.
Asryan, G.
Chuang, Y. C.
Fang, J. M.
Hsu, C. L.
Huang, T. R.
Kumar, G. Kiran
Lee, S. C.
Li, J.
Li, J. M.
Li, Y. J.
Li, Y. L.
Lin, C. W.
Lin, F. K.
Liu, Y. F.
Ma, H.
Ruan, X. C.
Shen, Y. T.
Singh, V.
Tang, C. J.
Tseng, C. H.
Xu, Y.
Yang, S. W.
Yu, C. X.
Yue, Q.
Zeng, Z.
Zeyrek, Mehmet Tevfik
Zhou, Z. Y.
We report new limits on a spin-independent weakly interacting massive particle (WIMP)-nucleon interaction cross section using 39.5 kg days of data taken with a p-type point-contact germanium detector of 840 g fiducial mass at the Kuo-Sheng Reactor Neutrino Laboratory. Crucial to this study is the understanding of the selection procedures and, in particular, the bulk-surface events differentiation at the sub-keV range. The signal-retaining and background-rejecting efficiencies were measured with calibration gamma sources and a novel n-type point-contact germanium detector. Part of the parameter space in the cross section versus WIMP-mass implied by various experiments is probed and excluded.