First Results from a Spin-Independent WIMP Search with COSINE-100

COSINE-100 is a direct detection dark matter search that uses low-background NaI(Tl) scintillation detectors to test DAMA/LIBRA’s claim of dark matter discovery. Located 700 meters underground at the Yangyang Underground Laboratory, COSINE-100 consists of 106 kg of low-background NaI(Tl) detectors submerged within a 2000 liter liquid scintillator veto. In this talk, I will discuss a search for one of the most common models of dark matter, the spin-independent WIMP in the standard halo model. We observe no excess of events above COSINE-100’s background model, allowing us to rule out the spin-independent interpretation of the DAMA signal as well as set the most stringent exclusion limits on spin-independent WIMP interactions in a sodium iodide detector.