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
- Lin, S. K.
- Wong, H. T.
- He, D.
- Li, X.
- Li, H. B.
- Lin, S. T.
- Zhou, Z. Y.
- Yue, Q.
- Wu, S. C.
- Li, J.
- Lin, C. W.
- Lin, F. K.
- Ruan, X. C.
- Singh, V.
- Fang, B. B.
- Deniz, Muhammed
- Wang, Y. R.
- Wang, J. J.
- Soma, A. K.
DOIAbstract
An energy threshold of (220 +/- 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 experiment...
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