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Final Result of the MAJORANA DEMONSTRATOR's Search for Neutrinoless Double-β Decay in ⁷⁶Ge

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arxiv 2207.07638 v2 pith:MSPAPGXS submitted 2022-07-15 nucl-ex hep-exphysics.ins-det

Final Result of the MAJORANA DEMONSTRATOR's Search for Neutrinoless Double-$\beta$ Decay in $^{76}$Ge

I.J. Arnquist , F.T. Avignone III , A.S. Barabash , C.J. Barton , P.J. Barton , K.H. Bhimani , E. Blalock , B. Bos
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M. Busch M. Buuck T.S. Caldwell Y-D. Chan C.D. Christofferson P.-H. Chu M.L. Clark C. Cuesta J.A. Detwiler Yu. Efremenko H. Ejiri S.R. Elliott G.K. Giovanetti M.P. Green J. Gruszko I.S. Guinn V.E. Guiseppe C.R. Haufe R. Henning D. Hervas Aguilar E.W. Hoppe A. Hostiuc M.F. Kidd I. Kim R.T. Kouzes T.E. Lannen V A. Li A.M. Lopez J.M. L\'opez-Casta\~no E.L. Martin R.D. Martin R. Massarczyk S.J. Meijer S. Mertens T.K. Oli G. Othman L.S. Paudel W. Pettus A.W.P. Poon D.C. Radford A.L. Reine K. Rielage N.W. Ruof D.C. Schaper D. Tedeschi R.L. Varner S. Vasilyev J.F. Wilkerson C. Wiseman W. Xu C.-H. Yu B.X. Zhu
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classification nucl-ex hep-exphysics.ins-det
keywords betademonstratorarraysdecaydetectorsdouble-enrichedmajorana
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

The MAJORANA DEMONSTRATOR searched for neutrinoless double-$\beta$ decay ($0\nu\beta\beta$) of $^{76}$Ge using modular arrays of high-purity Ge detectors operated in vacuum cryostats in a low-background shield. The arrays operated with up to 40.4 kg of detectors (27.2 kg enriched to $\sim$88\% in $^{76}$Ge). From these measurements, the DEMONSTRATOR has accumulated 64.5 kg yr of enriched active exposure. With a world-leading energy resolution of 2.52 keV FWHM at the 2039 keV $Q_{\beta\beta}$ (0.12\%), we set a half-life limit of $0\nu\beta\beta$ in $^{76}$Ge at $T_{1/2}>8.3\times10^{25}$ yr (90\% C.L.). This provides a range of upper limits on $m_{\beta\beta}$ of $(113-269)$ meV (90\% C.L.), depending on the choice of nuclear matrix elements.

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