Abstract
We present the results of a search for dark matter weakly interacting massive particles (WIMPs) in the mass range below using a target of low-radioactivity argon with a 6786.0 kg d exposure. The data were obtained using the DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso. The analysis is based on the ionization signal, for which the DarkSide-50 time projection chamber is fully efficient at . The observed rate in the detector at is about and is almost entirely accounted for by known background sources. We obtain a 90% C.L. exclusion limit above for the spin-independent cross section of dark matter WIMPs on nucleons, extending the exclusion region for dark matter below previous limits in the range .
1 More- Received 28 April 2018
DOI:https://doi.org/10.1103/PhysRevLett.121.081307
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