Title: Probing Majorana neutrinos with double-beta decay
Authors: AGOSTINI M.BAKALYAROV A.M.BALATA M.BARABANOV I.BAUDIS L.BAUER C.BELLOTTI E.BELOGUROV S.BETTINI A.BEZRUKOV L.BOROWICZ D.BRUDANIN V.BRUGNERA R.CALDWELL A.CATTADORI CCHERNOGOROV A.COMELLATO T.D'ANDREA V.DEMIDOVA E.V.DI MARCO N.DOMULA A.R.DOROSHKEVICH E.EGOROV V.FALKENSTEIN R.FOMINA M.GANGAPSHEV A.GARFAGNINI A.GIORDANO M.GRABMAYR P.GURENTSOV V.GUSEV K.HAKENMÜLLER J.HEGAI A.HEISEL M.HEMMER S.HILLER R.HOFMANN W.HULT MIKAELINZHECHIK L.JANICSKO J.JOCHUM J.JUNKER M.KAZALOV V.KERMAÏDIC Y.KIHM T.KIRPICHNIKOV IKIRSCH A.KISH A.KLIMENKO A.KNEISSL R.KNOEPFLE K.T.KOCHETOV O.KORNOUKHOV V.KRAUSE P.KUZMINOV V.LAUBENSTEIN M.LAZZARO A.LINDNER M.LIPPI I.LUBASHEVSKY A.LUBSANDORZHIEV B.LUTTER GUILLAUMEMACOLINO C.MAJOROVITS B.MANESCHG W.MILORADOVIC M.MINGAZHEVA R.MISIASZEK M.MOSEEV P.NEMCHENOK I.PANAS K.PANDOLA L.PELCZAR K.PERTOLDI L.PISERI P.PULLIA A.RANSOM C.RIBOLDI S.RUMYANTSEVA N.SADA C.SALA E.SALAMIDA F.SCHMITT C.SCHNEIDER B.SCHOENERT S.SCHULZ O.SCHWARZ M.SCHWINGENHEUER B.SCHÜTZ A. K.SELIVANENKO O.SHEVCHIK E.SHIRCHENKO M.SIMGEN H.SMOLNIKOV A.STANCO L.STUKOV D.VANHOEFER L.VASENKO A. A.VERESNIKOVA A.VON STURM K.WAGNER V.WEGMANN A.WESTER T.WIESINGER C.WOJCIK M.YANOVICH E.ZHITNIKOV I.ZHUKOV S. V.ZINATULINA D.ZSCHOCKE A.ZSIGMOND A. J.ZUBER K.ZUZEL G.
Citation: SCIENCE vol. 365 no. 6460 p. 1445-1448
Publisher: AMER ASSOC ADVANCEMENT SCIENCE
Publication Year: 2019
JRC N°: JRC112861
ISSN: 0036-8075 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC112861
DOI: 10.1126/science.aav8613
Type: Articles in periodicals and books
Abstract: A discovery that neutrinos are Majorana fermions would have profound implications for particle physics and cosmology. The Majorana character of neutrinos would make possible the neutrinoless double-beta (0nbetabeta) decay, a matter-creating process without the balancing emission of antimatter. The GERDA Collaboration searches for the 0nbetabeta decay of 76Ge by operating bare germanium detectors in an active liquid argon shield. With a total exposure of 82.4 kg⋅year, we observe no signal and derive a lower half-life limit of T1/2 > 0.9 × 1026 years (90% C.L.). Our T1/2 sensitivity, assuming no signal, is 1.1 × 1026 years. Combining the latter with those from other 0nbetabeta decay searches yields a sensitivity to the effective Majorana neutrino mass of 0.07 to 0.16 electron volts.
JRC Directorate:Nuclear Safety and Security

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