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Search for Neutrinoless Double-Beta Decay with the Upgraded EXO-200 Detector
J.B. Albert ; G. Anton ; I. Badhrees ; P.S. Barbeau ; R. Bayerlein ; D. Beck ; V. Belov ; M. Breidenbach ; T. Brunner ; G.F. Cao ; W.R. Cen ; C. Chambers ; B. Cleveland ; M. Coon ; A. Craycraft ; W. Cree ; T. Daniels ; M. Danilov ; S.J. Daugherty ; J. Daughhetee ; J. Davis ; S. Delaquis ; A. Der Mesrobian-Kabakian ; R. DeVoe ; T. Didberidze ; J. Dilling ; A. Dolgolenko ; M.J. Dolinski ; W. Fairbank Jr. ; J. Farine ; S. Feyzbakhsh ; P. Fierlinger ; D. Fudenberg ; R. Gornea ; K. Graham ; G. Gratta ; C. Hall ; E.V. Hansen ; J. Hoessl ; P. Hufschmidt ; M. Hughes ; A. Jamil ; M.J. Jewell ; A. Johnson ; S. Johnston ; A. Karelin ; L.J. Kaufman ; T. Koffas ; S. Kravitz ; R. Krücken ; A. Kuchenkov ; K.S. Kumar ; Y. Lan ; D.S. Leonard ; G.S. Li ; S. Li ; C. Licciardi ; Y.H. Lin ; R. MacLellan ; T. Michel ; B. Mong ; D. Moore ; K. Murray ; R. Nelson ; O. Njoya ; A. Odian ; I. Ostrovskiy ; A. Piepke ; A. Pocar ; F. Retière ; P.C. Rowson ; J.J. Russell ; S. Schmidt ; A. Schubert ; D. Sinclair ; V. Stekhanov ; M. Tarka ; T. Tolba ; R. Tsang ; P. Vogel ; J.-L. Vuilleumier ; M. Wagenpfeil ; A. Waite ; T. Walton ; M. Weber ; L.J. Wen ; U. Wichoski ; G. Wrede ; L. Yang ; Y.-R. Yen ; O.Ya. Zeldovich ; J. Zettlemoyer ; T. Ziegler ;
Date:	27 Jul 2017
Abstract:	Results from a search for neutrinoless double-beta decay $0 ueta!eta$ of $^{136}$Xe are presented using the first year of data taken with the upgraded EXO-200 detector. Relative to previous searches by EXO-200, the energy resolution of the detector has been improved to $sigma/E$=1.23%, the electric field in the drift region has been raised by 50%, and a system to suppress radon in the volume between the cryostat and lead shielding has been implemented. In addition, analysis techniques that improve topological discrimination between $0 ueta!eta$ and background events have been developed. Incorporating these hardware and analysis improvements, the median 90% confidence level $0 ueta!eta$ half-life sensitivity after combining with the full data set acquired before the upgrade has increased 2-fold to $3.7 cdot 10^{25}$ yr. No statistically significant evidence for $0 ueta!eta$ is observed, leading to a lower limit on the $0 ueta!eta$ half-life of $1.8cdot10^{25}$ yr at the 90% confidence level.
Source:	arXiv, 1707.8707
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