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25 April 2024

» arxiv » 2009.06079

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Final Results of GERDA on the Search for Neutrinoless Double-$β$ Decay
GERDA collaboration ; M. Agostini ; G. R. Araujo ; A. M. Bakalyarov ; M. Balata ; I. Barabanov ; L. Baudis ; C. Bauer ; E. Bellotti ; S. Belogurov ; A. Bettini ; L. Bezrukov ; V. Biancacci ; D. Borowicz ; E. Bossio ; V. Bothe ; V. Brudanin ; R. Brugnera ; A. Caldwell ; C. Cattadori ; A. Chernogorov ; T. Comellato ; V. D'Andrea ; E. V. Demidova ; N. Di Marco ; E. Doroshkevich ; F. Fischer ; M. Fomina ; A. Gangapshev ; A. Garfagnini ; C. Gooch ; P. Grabmayr ; V. Gurentsov ; K. Gusev ; J. Hakenmüller ; S. Hemmer ; R. Hiller ; W. Hofmann ; J. Huang ; M. Hult ; L. V. Inzhechik ; J. Janicskó Csáthy ; J. Jochum ; M. Junker ; V. Kazalov ; Y. Kermaïdic ; H. Khushbakht ; T. Kihm ; I. V. Kirpichnikov ; A. Klimenko ; R. Kneißl ; K. T. Knöpfle ; O.Kochetov ; V. N. Kornoukhov ; P. Krause ; V. V. Kuzminov ; M. Laubenstein ; A. Lazzaro ; M. Lindner ; I. Lippi ; A. Lubashevskiy ; B. Lubsandorzhiev ; G. Lutter ; C. Macolino ; B. Majorovits ; W. Maneschg ; L. Manzanillas ; M. Miloradovic ; R. Mingazheva ; M. Misiaszek ; P. Moseev ; Y. Müller ; I. Nemchenok ; K. Panas ; L. Pandola ; K. Pelczar ; L. Pertoldi ; P. Piseri ; A. Pullia ; C. Ransom ; L. Rauscher ; S. Riboldi ; N. Rumyantseva ; C. Sada ; F. Salamida ; S. Schönert ; J. Schreiner ; M. Schütt ; A.-K. Schütz ; O. Schulz ; M. Schwarz ; B. Schwingenheuer ; O. Selivanenko ; E. Shevchik ; M. Shirchenko ; L. Shtembari ; H. Simgen ; A. Smolnikov ; D. Stukov ; A. A. Vasenko ; A. Veresnikova ; C. Vignoli ; K. von Sturm ; T. Wester ; C. Wiesinger ; M. Wojcik ; E. Yanovich ; B. Zatschler ; I. Zhitnikov ; S. V. Zhukov ; D. Zinatulina ; A. Zschocke ; A. J. Zsigmond ; K. Zuber ; G. Zuzel ;
Date:	13 Sep 2020
Abstract:	The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-$eta$ ($0 uetaeta$) decay of $^{76}$Ge, whose discovery would have far-reaching implications in cosmology and particle physics. By operating bare germanium diodes, enriched in $^{76}$Ge, in an active liquid argon shield, GERDA achieved an unprecedently low background index of $5.2 imes10^{-4}$ counts/(keV$cdot$kg$cdot$yr) in the signal region and met the design goal to collect an exposure of 100 kg$cdot$yr in a background-free regime. When combined with the result of Phase I, no signal is observed after 127.2 kg$cdot$yr of total exposure. A limit on the half-life of $0 uetaeta$ decay in $^{76}$Ge is set at $T_{1/2}>1.8 imes10^{26}$ yr at 90% C.L., which coincides with the sensitivity assuming no signal.
Source:	arXiv, 2009.06079
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