Title: Results on neutrinoless double-beta decay of 76Ge from phase I of the GERDA experiment
Authors: AGOSTINI M.ALLARDT M.ANDREOTTI ERICABAKALYAROV A.m.BALATA M.BARABANOV I.BARNABE HEIDER MBARROS N.BAUDIS L.BAUER C.BECERICI-SCHMIDT N.BELLOTTI E.BELOGUROV S.BELYAEV S.t.BENATO G.BETTINI A.BEZRUKOV L.BODE T.BRUDANIN V.BRUGNERA R.BUDJAS D.CALDWELL A.CATTADORI CCHERNOGOROV A.COSSAVELLA F.DEMIDOVA E.v.DOMULA A.r.EGOROV V.FALKENSTEIN R.GOTTI C.FERELLA A.FREUND K.FRODYMA N.GANGAPSHEV A.GARFAGNINI A.GRABMAYR P.GURENTSOV V.GUSEV K.GUTHIKONDA K. K.HAMPEL W.HEGAI A.HEISEL M.HEMMER S.HEUSSER G.HOFMANN W.HULT MikaelIOANNUCCI L.Inzhechik L.JANICSKO J.JOCHUM J.JUNKER M.KIRPICHNIKOV IKIRSCH A.KLIMENKO A.KIHM T.KNOEPFLE K.t.KOCHETOV O.KUZMINOV V.Kornoukhov V.LAUBENSTEIN M.LAZZARO A.LEBEDEV VLEHNERT B.LIAO H.LINDNER M.LIPPI I.LIU X.LUBASHEVSKY A.LUBSANDORZHIEV B.LUTTER GUILLAUMEMajorovits B.MACOLINO C.MACHADO A. A.MANESCHG W.MISIASZEK M.NEMCHENOK I.NISI S.O'SHAUGHNESSY C.PANDOLA L.PESSINA G.PELCZAR K.PULLIA A.RUMYANTSEVA N.RIBOLDI S.SADA C.SALATHE M.SCHMITT C.SCHREINER J.SCHULZ O.SCHWINGENHEUER B.SCHOENERT S.SHEVCHIK E.SHIRCHENKO M.SIMGEN H.SMOLNIKOV A.STANCO L.STRECKER H.TARKA M.UR C AVASENKO A. A.VOLYNETS O.VON STURM K.WALTER M.WAGNER V.WEGMANN A.WESTER T.WOJCIK M.YANOVICH E.ZAVARISE P.ZHITNIKOV I.ZHUKOV S. V.ZINATULINA D.ZUBER K.ZUZEL G.
Citation: PHYSICAL REVIEW LETTERS vol. 111 no. 12 p. 122503 [6 pages]
Publisher: AMER PHYSICAL SOC
Publication Year: 2013
JRC N°: JRC84522
ISSN: 0031-9007
URI: http://link.aps.org/doi/10.1103/PhysRevLett.111.122503
http://publications.jrc.ec.europa.eu/repository/handle/JRC84522
DOI: 10.1103/PhysRevLett.111.122503
Type: Articles in periodicals and books
Abstract: Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the Standard Model of particle physics. This Letter reports the results from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope 76Ge. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kgyr. A blind analysis is performed. The background index is about 1.10^{-2} cts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of 76Ge, T_1/2 > 2.1 10^{25} yr (90% C.L.). The combination with the results from the previous experiments with 76Ge yields T_1/2 > 3.0 10^{25} yr (90% C.L.).
JRC Directorate:Health, Consumers and Reference Materials

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