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

Abstract

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.

5 pages, 5 figures

References in corpus (6)

• Dark Matter Results from 225 Live Days of XENON100 Data
• First results from DAMA/LIBRA and the combined results with DAMA/NaI
• New results from DAMA/LIBRA
• Search for Low-Mass WIMPs with SuperCDMS
• New limits on spin-independent and spin-dependent couplings of low-mass WIMP dark matter with a germanium detector at a threshold of 220 eV
• Ultra-Low-Energy Germanium Detector for Neutrino-Nucleus Coherent Scattering and Dark Matter Searches

Cited by in corpus (12)

• The China Jinping Underground Laboratory and its Early Science
• Quantifying the evidence for Dark Matter in CoGeNT data
• Dark Matter vs. Neutrinos: The effect of astrophysical uncertainties and timing information on the neutrino floor
• Can dark matter - electron scattering explain the DAMA annual modulation signal?
• The Past and Future of Light Dark Matter Direct Detection
• Muon-induced neutrons do not explain the DAMA data
• Light mediators in dark matter direct detections
• Exotic Dark Matter Search with CDEX-10 Experiment at China's Jinping Underground Laboratory
• Exothermic isospin-violating dark matter after SuperCDMS and CDEX
• Prototype of Pulse Digitizer and Readout Electronics for CDEX-10 in CJPL
• Measurement of the Compton scattering in germanium with a p-type point-contact germanium detector for dark matter detection
• Study of cosmogenic activation in ${}^{76}$Ge enriched germanium detectors during fabrication and transportation above ground