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Limits on light weakly interacting massive particles from the CDEX-1 experiment with a p -type point-contact germanium detector at the China Jinping Underground Laboratory

2014; American Physical Society; Volume: 90; Issue: 9 Linguagem: Inglês

10.1103/physrevd.90.091701

1550-7998

Qian Yue, Wen Zhao, K. Kang, J. Cheng, Y. J. Li, S. T. Lin, J. P. Chang, N. Chen, Q. H. Chen, Y. H. Chen, Y. C. Chuang, Z. Deng, Q. Du, Haipeng Gong, Xiaoyang Hao, H. He, Qingming He, Han‐Xiong 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. Liao, F. K. Lin, S. K. Liu, L. C. Lü, Hao Ma, S. J. Mao, Jiangyi Qin, Jing Ren, Jing Ren, Xichao Ruan, M. B. Shen, L. Singh, M. K. Singh, A. K. Soma, Jian Su, C. J. Tang, C. H. Tseng, J. M. Wang, L. Wang, Qing Wang, H. T. Wong, Yongcheng Wu, Y. C. Wu, Y. C. Wu, Zhong-Zhi Xianyu, Rui-Qing Xiao, Haoyang Xing, F. Z. Xu, Y. Xu, Xun-Jie Xu, T. Xue, L. T. Yang, S. W. Yang, Yi Nan, C. X. Yu, Hao Yu, Xun-Zhen Yu, X. H. Zeng, Zhi Zeng, L. Zhang, Y. H. Zhang, M. G. Zhao, Z. Y. Zhou, J. J. Zhu, W. B. Zhu, X. Z. Zhu, Zhonghua Zhu,

High-Energy Particle Collisions Research

We report results of a search for light Dark Matter WIMPs with CDEX-1 experiment at the China Jinping Underground Laboratory, based on 53.9 kg-days of data from a p-type point-contact germanium detector enclosed by a NaI(Tl) crystal scintillator as anti-Compton detector. The event rate and spectrum above the analysis threshold of 475 eVee are consistent with the understood background model. Part of the allowed regions for WIMP-nucleus coherent elastic scattering at WIMP mass of 6-20 GeV are probed and excluded. Independent of interaction channels, this result contradicts the interpretation that the anomalous excesses of the CoGeNT experiment are induced by Dark Matter, since identical detector techniques are used in both experiments.