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Limits on light WIMPs from the CDEX-1 experiment with a p-type point-contact germanium detector at the China Jingping Underground Laboratory

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arxiv 1404.4946 v2 pith:OQJJ2GMU submitted 2014-04-19 hep-ex physics.ins-det

Q. Yue , W. Zhao , K.J. Kang , J.P. Cheng , Y.J. Li , S.T. Lin , J.P. Chang , N. Chen
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Q.H. Chen Y.H. Chen Y.C. Chuang Z. Deng Q. Du H. Gong X.Q. Hao H.J. He Q.J. He H.X. Huang T.R. Huang H. Jiang H.B. Li J.M. 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 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 Y.C. Wu Z.Z. Xianyu R.Q. Xiao H.Y. Xing F.Z. Xu 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 Z.Y. Zhou J.J. Zhu W.B. Zhu X.Z. Zhu Z.H. Zhu
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classification hep-exphysics.ins-det
keywords detectorexperimentcdex-1chinadarkgermaniumlaboratorylight
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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.

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