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A Search for Neutrinoless Double-Beta Decay in $^{76}$Ge with 26 kg-yr of Exposure from the MAJORANA DEMONSTRATOR

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arxiv 1902.02299 v1 pith:WLUH5LRK submitted 2019-02-06 nucl-ex hep-ex

S.I. Alvis , I.J. Arnquist , F.T. Avignone III , A.S. Barabash , C.J. Barton , V. Basu , F.E. Bertrand , B. Bos
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M. Busch M. Buuck T.S. Caldwell Y-D. Chan C.D. Christofferson P.-H. Chu C. Cuesta J.A. Detwiler Yu. Efremenko H. Ejiri S.R. Elliott T. Gilliss G.K. Giovanetti M.P. Green J. Gruszko I.S. Guinn V.E. Guiseppe C.R. Haufe R.J. Hegedus L. Hehn R. Henning D. Hervas Aguilar E.W. Hoppe M.A. Howe M.F. Kidd S.I. Konovalov R.T. Kouzes A.M. Lopez R.D. Martin R. Massarczyk S.J. Meijer S. Mertens J. Myslik G. Othman W. Pettus A. Piliounis A.W.P. Poon D.C. Radford J. Rager A.L. Reine K. Rielage N.W. Ruof B. Shanks M. Shirchenko D. Tedeschi R.L. Varner S. Vasilyev B.R. White J.F. Wilkerson C. Wiseman W. Xu E. Yakushev C.-H. Yu V. Yumatov I. Zhitnikov B.X. Zhu
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classification nucl-exhep-ex
keywords decaydouble-betamajorananeutrinolessdemonstratorsearchbackgroundbeta
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abstract

The MAJORANA Collaboration is operating an array of high purity Ge detectors to search for the neutrinoless double-beta decay of $^{76}$Ge. The MAJORANA DEMONSTRATOR consists of 44.1 kg of Ge detectors (29.7 kg enriched to 88% in $^{76}$Ge) split between two modules constructed from ultra-clean materials. Both modules are contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota. We present updated results on the search for neutrinoless double-beta decay in $^{76}$Ge with $26.0\pm0.5$ kg-yr of enriched exposure. With the DEMONSTRATOR's unprecedented energy resolution of 2.53 keV FWHM at $Q_{\beta\beta}$, we observe one event in the region of interest with 0.65 events expected from the estimated background, resulting in a lower limit on the $^{76}$Ge neutrinoless double-beta decay half-life of $2.7\times10^{25}$ yr (90% CL) with a median sensitivity of $4.8\times10^{25}$ yr (90% CL). Depending on the matrix elements used, a 90% CL upper limit on the effective Majorana neutrino mass in the range of 200-433 meV is obtained. The measured background in the low-background configurations is $11.9\pm2.0$ counts/(FWHM t yr).

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