Results from the first use of low radioactivity argon in a dark matter search

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ID: 267169
2016
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Abstract
Liquid argon is a bright scintillator with potent particle identification properties, making it an attractive target for direct-detection dark matter searches. The DarkSide-50 dark matter search here reports the first WIMP search results obtained using a target of low-radioactivity argon. DarkSide-50 is a dark matter detector, using a two-phase liquid argon time projection chamber, located at the Laboratori Nazionali del Gran Sasso. The underground argon is shown to contain Ar39 at a level reduced by a factor (1.4±0.2)×103 relative to atmospheric argon. We report a background-free null result from (2616±43) kg d of data, accumulated over 70.9 live days. When combined with our previous search using an atmospheric argon, the 90% C.L. upper limit on the WIMP-nucleon spin-independent cross section, based on zero events found in the WIMP search regions, is 2.0×10−44 cm2 (8.6×10−44 cm2, 8.0×10−43 cm2) for a WIMP mass of 100 GeV/c2 (1 TeV/c2, 10 TeV/c2).
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Authors Paolo Agnes, L. Agostino, I. F. M. Albuquerque, T. Alexander, A. K. Alton, K. Arisaka, H. O. Back, B. Baldin, K. Biery, G. Bonfini, M. Bossa, B. Bottino, A. Brigatti, Jason Brodsky, F. Budano, S. Bussino, M. Cadeddu, L. Cadonati, Mariano Cadoni, F. Calaprice, Nicola Canci, A. Candela, H. Cao, M. Cariello, M. Carlini, Sergio Catalanotti, P. Cavalcante, A. Chepurnov, Alfredo Giuseppe Cocco, G. Covone, L. Crippa, Davide D'Angelo, M. D'Incecco, S. Davini, S. De Cecco, M. De Deo, M. De Vincenzi, Alexander Derbin, Alberto Devoto, F. Di Eusanio, G. Di Pietro, E. Edkins, A. Empl, A. Fan, Giuliana Fiorillo, K. Fomenko, G. Forster, Davide Franco, Federico Gabriele, Cristiano Galbiati, C. Giganti, A. M. Goretti, F. Granato, Luca Grandi, M. Gromov, M. Guan, Y. Guardincerri, B. R. Hackett, K. Herner, E. V. Hungerford, Al. Ianni, An. Ianni, I. James, C. Jollet, K. Keeter, C. L. Kendziora, Vladislav Kobychev, G. Koh, D. Korablev, G. Korga, A. Kubankin, X. Li, Marcello Lissia, P. Lombardi, S. Luitz, Y. Ma, I. N. Machulin, A. Mandarano, S. M. Mari, J. Maricic, Laura Marini, C. J. Martoff, Anselmo Meregaglia, P. D. Meyers, T. Miletic, R. Milincic, D. Montanari, A. Monte, Michele Montuschi, M. Monzani, P. Mosteiro, B. J. Mount, V. N. Muratova, P. Musico, J. Napolitano, A. Nelson, S. Odrowski, M. Orsini, Fausto Ortica, L. Pagani
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Journal physical review d
Year 2016
DOI
10.1103/physrevd.93.081101
URL
https://sciprofiles.com/publication/view/70f6aad66d6c5da02ff2adce7f85fcfc
Keywords
radioactivity search dark matter argon wimp cm2 darkside tev/c2

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