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    Agnes, P.; Agostino, L.; Albuquerque, I. F. M.; Alexander, T.; Arisaka, K.; Biery, K.; Bonfini, G.; Bossa, M.; Bottino, B.; Brigatti, A.; Brodsky, J.; Budano, F.; Cadeddu, M.; Calaprice, F.; Canci, N.; Cao, H.; Cariello, M.; Catalanotti, S.; Cocco, A. G.; Covone, G.; Crippa, L.; D’Angelo, D.; D’Incecco, M.; Davini, S.; De Vincenzi, M.; Derbin, A.; Devoto, A.; Di Eusanio, F.; Di Pietro, G.; Fiorillo, G.; Forster, G.; Goretti, A. M.; Granato, F.; Grandi, L.; Gromov, M.; Guan, M.; Guardincerri, Y.; Hackett, B. R.; Herner, K.; Hungerford, E. V.; Ianni, Al; James, I.; Jollet, C.; Keeter, K.; Kendziora, C. L.; Kobychev, V.; Koh, G.; Lissia, M.; Lombardi, P.; Luitz, S.; Machulin, I. N.; Mandarano, A.; Martoff, C. J.; Miletic, T.; Milincic, R.; Montanari, D.; Monte, A.; Montuschi, M.; Mount, B. J.; Muratova, V. N.; Musico, P.; Napolitano, J.; Orsini, M.; Pagani, L.; Pallavicini, M.; Parmeggiano, S.; Pelczar, K.; Perasso, S.; Pordes, S.; Pugachev, D. A.; Qian, H.; Randle, K.; Ranucci, G.; Razeto, A.; Rossi, B.; Rountree, D.; Sablone, D.; Saldanha, R.; Segreto, E.; Singh, P. N.; Skorokhvatov, M. D.; Smirnov, O.; Sotnikov, A.; Tartaglia, R.; Testera, G.; Tonazzo, A.; Unzhakov, E. V.; Vishneva, A.; Wada, M.; Walker, S.; Wang, H.; Watson, A. W.; Wojcik, M. M.; Xiang, X.; Xu, J.; Yang, C.; Zavatarelli, S.; Zec, A.; Zhu, C.; Zuzel, G.

    Physical review. D, 04/2016, Volume: 93, Issue: 8
    Journal Article

    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 super(39) Ar at a level reduced by a factor (1.4+ or -0.2)x10 super(3) relative to atmospheric argon. We report a background-free null result from (2616+ or -43)kgd 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 2.0x10 super(-44)cm super(2)(8.6x10-44cm super(2), 8.0x10 super(-43)cm super(2)) for a WIMP mass of 100GeV/c super(2)(1TeV/c super(2), 10TeV/c super(2)).