First results on low-mass WIMP from the CDEX-1 experiment at the China Jinping underground Laboratory
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, 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, 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. · 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. · 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.
Original · EN
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 cm² at 90% confidence level on the spin-independent cross-section at WIMP mass of 7 GeV before differentiating bulk signals from the surface backgrounds.
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