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24 April 2024

» arxiv » 1510.0702

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Low radioactivity argon dark matter search results from the DarkSide-50 experiment
DarkSide Collaboration ; 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 ; 25 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 ;
Date:	2 Oct 2015
Abstract:	The DarkSide-50 dark matter search reports the first results obtained using a target of low-radioactivity argon extracted from underground sources. The experiment is located at the Laboratori Nazionali del Gran Sasso and uses a two-phase time projection chamber as a detector. A total of 155 kg of low radioactivity argon has been obtained, and we have determined that underground argon is depleted in Ar-39 by a factor (1.4 +- 0.2) x 10^3 relative to atmospheric argon. The underground argon was also found to contain (2.05 +- 0.13) mBq/kg of Kr-85. We found no evidence for dark matter in the form of WIMPs in 70.9 live-days of data with a fiducial mass of (36.9 +- 0.6) kg. When combined with our preceding search with an atmospheric argon target, we set a 90 % C.L. upper limit on the WIMP-nucleon spin-independent cross section of 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 ).
Source:	arXiv, 1510.0702
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