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).
Results from the first use of low radioactivity argon in a dark matter search / P. 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, J. Brodsky, F. Budano, S. Bussino, M. Cadeddu, L. Cadonati, M. Cadoni, F. Calaprice, N. Canci, A. Candela, H. Cao, M. Cariello, M. Carlini, S. Catalanotti, P. Cavalcante, A. Chepurnov, A.G. Cocco, G. Covone, L. Crippa, D. D'Angelo, M. D'Incecco, S. Davini, S. De Cecco, M. De Deo, M. De Vincenzi, A. Derbin, A. Devoto, F. Di Eusanio, G. Di Pietro, E. Edkins, A. Empl, A. Fan, G. Fiorillo, K. Fomenko, G. Forster, D. Franco, F. Gabriele, C. Galbiati, C. Giganti, A.M. Goretti, F. Granato, L. Grandi, M. Gromov, M. Guan, Y. Guardincerri, B.R. Hackett, K. Herner, E.V. Hungerford, A. Ianni, A. Ianni, I. James, C. Jollet, K. Keeter, C.L. Kendziora, V. Kobychev, G. Koh, D. Korablev, G. Korga, A. Kubankin, X. Li, M. Lissia, P. Lombardi, S. Luitz, Y. Ma, I.N. Machulin, A. Mandarano, S.M. Mari, J. Maricic, L. Marini, C.J. Martoff, A. Meregaglia, P.D. Meyers, T. Miletic, R. Milincic, D. Montanari, A. Monte, M. Montuschi, M. Monzani, P. Mosteiro, B.J. Mount, V.N. Muratova, P. Musico, J. Napolitano, A. Nelson, S. Odrowski, M. Orsini, F. Ortica, L. Pagani, M. Pallavicini, E. Pantic, S. Parmeggiano, K. Pelczar, N. Pelliccia, S. Perasso, A. Pocar, S. Pordes, D.A. Pugachev, H. Qian, K. Randle, G. Ranucci, A. Razeto, B. Reinhold, A.L. Renshaw, A. Romani, B. Rossi, N. Rossi, D. Rountree, D. Sablone, P. Saggese, R. Saldanha, W. Sands, S. Sangiorgio, C. Savarese, E. Segreto, D.A. Semenov, E. Shields, P.N. Singh, M.D. Skorokhvatov, O. Smirnov, A. Sotnikov, C. Stanford, Y. Suvorov, R. Tartaglia, J. Tatarowicz, G. Testera, A. Tonazzo, P. Trinchese, E.V. Unzhakov, A. Vishneva, B. Vogelaar, M. Wada, S. Walker, H. Wang, Y. Wang, A.W. Watson, S. Westerdale, J. Wilhelmi, M.M. Wojcik, X. Xiang, J. Xu, C. Yang, J. Yoo, S. Zavatarelli, A. Zec, W. Zhong, C. Zhu, G. Zuzel. - In: PHYSICAL REVIEW D.. - ISSN 2470-0029. - 93:8(2016 Apr 08).
Results from the first use of low radioactivity argon in a dark matter search
D. D'Angelo;
2016
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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