1306.4135 (W. Zhao et al.)

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

W. Zhao, Q. Yue, K. J. Kang, J. P. Cheng, Y. J. Li, S. T. Lin, Y. Bai, Y. Bi, J. P. Chang, N. Chen, N. Chen, Q. H. Chen, Y. H. Chen, Y. C. Chuang, Z. Deng, C. Du, Q. Du, H. Gong, X. Q. Hao, H. J. He, Q. J. He, X. H. Hu, H. X. Huang, T. R. Huang, H. Jiang, H. B. Li, J. M. Li, J. Li, J. Li, X. Li, X. Y. Li, Y. L. Li, H. Y. Liao, F. K. Lin, S. K. Liu, L. C. Lv, H. Ma, S. J. Mao, J. Q. Qin, J. Ren, J. Ren, X. C. Ruan, M. B. Shen, L. Singh, M. K. Singh, A. K. Soma, J. Su, C. J. Tang, C. H. Tseng, J. M. Wang, L. Wang, Q. Wang, H. T. Wong, S. Y. Wu, W. Wu, Y. C. Wu, Y. C. Wu, Z. Z. Xianyu, H. Y. Xing, Y. Xu, X. J. Xu, T. Xue, L. T. Yang, S. W. Yang, N. Yi, C. X. Yu, H. Yu, X. Z. Yu, X. H. Zeng, Z. Zeng, L. Zhang, Y. H. Zhang, M. G. Zhao, S. N. Zhong, Z. Y. Zhou, J. J. Zhu, W. B. Zhu, X. Z. Zhu, Z. H. Zhu

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.

View original: http://arxiv.org/abs/1306.4135