Browsing by Author "B.B. Fang"

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New limits on spin-independent and spin-dependent couplings of low-mass WIMP dark matter with a germanium detector at a threshold of 220 eV
(American Physical Society, 2009) S.T. Lin; H.B. Li; X. Li; S.K. Lin; H.T. Wong; M. Deniz; B.B. Fang; D. He; J. Li; C.W. Lin; F.K. Lin; X.C. Ruan; V. Singh; A.K. Soma; J.J. Wang; Y.R. Wang; S.C. Wu; Q. Yue; Z.Y. Zhou
An energy threshold of (220Â±10)eV was achieved at an efficiency of 50% with a four-channel ultralow-energy germanium detector, each with an active mass of 5 g. This provides a unique probe to weakly interacting massive particles (WIMP) dark matter with mass below 10 GeV. With a data acquisition live time of 0.338 kg-day at the Kuo-Sheng Laboratory, constraints on WIMPs in the galactic halo were derived. The limits improve over previous results on both spin-independent WIMP-nucleon and spin-dependent WIMP-neutron cross-sections for WIMP mass between 3 and 6 GeV. Sensitivities for full-scale experiments are projected. This detector technique makes the unexplored sub-keV energy window accessible for new neutrino and dark matter experiments. © 2009 The American Physical Society.