Journal
PHYSICAL REVIEW D
Volume 88, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.88.052004
Keywords
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Funding
- National Natural Science Foundation of China [10935005, 10945002, 11275107, 11175099]
- National Basic Research program of China (973 Program) [2010CB833006]
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The China Dark Matter Experiment Collaboration reports the first experimental limit on weakly interacting massive particles (WIMPs) dark matter from 14.6 kg-days 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 sigma(chi N) = 1.75 x 10(-40) cm(2) at a 90% confidence level on the spin-independent cross section at a WIMP mass of 7 GeV before differentiating bulk signals from the surface backgrounds.
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