First Results from the DEAP-3600 Dark Matter Search with Argon at SNOLAB

Physical Review Letters
P-A AmaudruzDEAP-3600 Collaboration

Abstract

This Letter reports the first results of a direct dark matter search with the DEAP-3600 single-phase liquid argon (LAr) detector. The experiment was performed 2 km underground at SNOLAB (Sudbury, Canada) utilizing a large target mass, with the LAr target contained in a spherical acrylic vessel of 3600 kg capacity. The LAr is viewed by an array of PMTs, which would register scintillation light produced by rare nuclear recoil signals induced by dark matter particle scattering. An analysis of 4.44 live days (fiducial exposure of 9.87 ton day) of data taken during the initial filling phase demonstrates the best electronic recoil rejection using pulse-shape discrimination in argon, with leakage <1.2×10^{-7} (90% C.L.) between 15 and 31  keV_{ee}. No candidate signal events are observed, which results in the leading limit on weakly interacting massive particle (WIMP)-nucleon spin-independent cross section on argon, <1.2×10^{-44}  cm^{2} for a 100  GeV/c^{2} WIMP mass (90% C.L.).

References

Oct 1, 2016·Physical Review Letters·Andi TanUNKNOWN PandaX-II Collaboration
Jan 28, 2017·Physical Review Letters·D S AkeribUNKNOWN LUX Collaboration
Dec 9, 2017·Physical Review Letters·E AprileUNKNOWN XENON Collaboration

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Citations

Mar 9, 2019·Physical Review Letters·E AprileA Schwenk
Apr 24, 2019·Physical Review Letters·C HaUNKNOWN COSINE-100 Collaboration
Jan 21, 2021·Sensors·Jean-François PratteSerge A Charlebois

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