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Phys Rev Lett. 2018 Jun 15;120(24):241301. doi: 10.1103/PhysRevLett.120.241301.

Limits on Light Weakly Interacting Massive Particles from the First 102.8 kg×day Data of the CDEX-10 Experiment.

Author information

1
Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084.
2
College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875.
3
Institute of Physics, Academia Sinica, Taipei 11529.
4
Department of Physics, Dokuz Eylül University, Ízmir 35160.
5
Department of Physics, Tsinghua University, Beijing 100084.
6
NUCTECH Company, Beijing 100084.
7
YaLong River Hydropower Development Company, Chengdu 610051.
8
College of Physical Science and Technology, Sichuan University, Chengdu 610064.
9
Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413.
10
School of Physics, Nankai University, Tianjin 300071.
11
Department of Physics, Banaras Hindu University, Varanasi 221005.
12
Department of Physics, Beijing Normal University, Beijing 100875.

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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