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

Li, H.; Liao, H.; Lin, S.; Liu, S.; Singh, L.; Singh, M.; Soma, A.; Wong, H.; Wu, Y.; Zhao, W.; Asryan, G.; Chuang, Y.; DENİZ, MUHAMMED; Fang, J.; Hsu, C.; Huang, T.; Kumar, G.; Lee, S.; Li, J.; Li, J.; Li, Y.; Li, Y.; Lin, C.; Lin, F.; Liu, Y.; Ma, H.; Ruan, X.; Shen, Y.; Singh, V.; Tang, C.; Tseng, C.; Xu, Y.; Yang, S.; Yu, C.; Yue, Q.; Zeng, Z.; ZEYREK, MEHMET; Zhou, Z.

doi:10.1103/physrevlett.110.261301

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

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Li H. B., Liao H. Y., Lin S. T., Liu S. K., Singh L., Singh M. K., ...More

PHYSICAL REVIEW LETTERS, vol.110, no.26, 2013 (SCI-Expanded)

Publication Type: Article / Article
Volume: 110 Issue: 26
Publication Date: 2013
Doi Number: 10.1103/physrevlett.110.261301
Journal Name: PHYSICAL REVIEW LETTERS
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Middle East Technical University Affiliated: Yes

Abstract

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.