Limits on Light Weakly Interacting Massive Particles from the First <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>102.8</mml:mn><mml:mtext> </mml:mtext><mml:mtext>kg</mml:mtext><mml:mo>×</mml:mo><mml:mtext>day</mml:mtext></mml:mrow></mml:math> Data of the CDEX-10 Experiment

Hao Jiang, Liwei Jia, Qian Yue, K. Kang, Jianping Cheng, Y. J. Li, H. T. Wong, M. Ağartıoğlu, Haipeng An, J. P. Chang

Abstract

We report the first results of a light weakly interacting massive particles (WIMPs) search from the CDEX-10 experiment with a 10 kg germanium detector array immersed in liquid nitrogen at the China Jinping Underground Laboratory with a physics data size of 102.8 kg day. At an analysis threshold of 160 eVee, improved limits of 8×10^{-42} and 3×10^{-36} cm^{2} at a 90% confidence level on spin-independent and spin-dependent WIMP-nucleon cross sections, respectively, at a WIMP mass (m_{χ}) of 5 GeV/c^{2} are achieved. The lower reach of m_{χ} is extended to 2 GeV/c^{2}.

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