First results on low-mass WIMP from the CDEX-1 experiment at the China Jinping underground Laboratory

Authors :: Zhao, W.
Yue, Q.
Kang, K. J.
Cheng, J. P.
Li, Y. J.
Lin, S. T.
Bai, Y.
Bi, Y.
Chang, J. P.
Chen, N.
Chen, Q. H.
Chen, Y. H.
Chuang, Y. C.
Deng, Z.
Du, C.
Du, Q.
Gong, H.
Hao, X. Q.
He, H. J.
He, Q. J.
Hu, X. H.
Huang, H. X.
Huang, T. R.
Jiang, H.
Li, H. B.
Li, J. M.
Li, J.
Li, X.
Li, X. Y.
Li, Y. L.
Liao, H. Y.
Lin, F. K.
Liu, S. K.
Lv, L. C.
Ma, H.
Mao, S. J.
Qin, J. Q.
Ren, J.
Ruan, X. C.
Shen, M. B.
Singh, L.
Singh, M. K.
Soma, A. K.
Su, J.
Tang, C. J.
Tseng, C. H.
Wang, J. M.
Wang, L.
Wang, Q.
Wong, H. T.
Wu, S. Y.
Wu, W.
Wu, Y. C.
Xianyu, Z. Z.
Xing, H. Y.
Xu, Y.
Xu, X. J.
Xue, T.
Yang, L. T.
Yang, S. W.
Yi, N.
Yu, C. X.
Yu, H.
Yu, X. Z.
Zeng, X. H.
Zeng, Z.
Zhang, L.
Zhang, Y. H.
Zhao, M. G.
Zhong, S. N.
Zhou, Z. Y.
Zhu, J. J.
Zhu, W. B.
Zhu, X. Z.
Zhu, Z. H.
Source :: Physical Review D 88, 052004 (2013)
Publication Year :: 2013
Abstract: The China Dark matter Experiment collaboration reports the first experimental limit on WIMP dark matter from 14.6 kg-day of data taken with a 994 g p-type point-contact germanium detector at the China Jinping underground Laboratory where the rock overburden is more than 2400 m. The energy threshold achieved was 400 eVee. According to the 14.6 kg-day live data, we placed the limit of N= 1.75 * 10^{-40} cm^{2} at 90% confidence level on the spin-independent cross-section at WIMP mass of 7 GeV before differentiating bulk signals from the surface backgrounds.<br />Comment: 5 pages, 5 figures

Subjects :: High Energy Physics - Experiment
Astrophysics - Cosmology and Extragalactic Astrophysics
Physics - Instrumentation and Detectors

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