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

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arxiv 1510.00702 v3 pith:HAZVEN6S submitted 2015-10-02 astro-ph.CO astro-ph.IMhep-exphysics.ins-det

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

The DarkSide Collaboration: P. Agnes , L. Agostino , I. F. M. Albuquerque , T. Alexander , A. K. Alton , K. Arisaka , H. O. Back , B. Baldin
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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 Al. Ianni An. 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 M. Smallcomb 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
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classification astro-ph.CO astro-ph.IMhep-exphysics.ins-det
keywords argonsearchdarkmatterwimpatmosphericdarkside-50first
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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 two-phase liquid argon time projection chamber, located at the Laboratori Nazionali del Gran Sasso. The underground argon is shown to contain Ar-39 at a level reduced by a factor (1.4 +- 0.2) x 10^3 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 x 10^-44 cm^2 (8.6 x 10^-44 cm^2, 8.0 x 10^-43 cm^2) for a WIMP mass of 100 GeV/c^2 (1 TeV/c^2 , 10 TeV/c^2).

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