Title: Search of Neutrinoless Double Beta Decay with the GERDA Experiment
Authors: AGOSTINI M.ALLARDT M.BAKALYAROV A.m.BALATA M.BARABANOV I.BAUDIS L.BAUER C.BECERICI-SCHMIDT N.BELLOTTI E.BELOGUROV S.BELYAEV S.t.BENATO G.BETTINI A.BEZRUKOV L.BODE T.BOROWICZ D.BRUDANIN V.BRUGNERA R.BUDJAS D.CALDWELL A.CATTADORI CCHERNOGOROV A.D'ANDREA V.DEMIDOVA E.v.DOMULA A.r.DOROSHKEVICH E.EGOROV V.FALKENSTEIN R.FEDOROVA O.FREUND K.FRODYMA N.GANGAPSHEV A.GARFAGNINI A.GOOCH C.GOTTI C.GRABMAYR P.GURENTSOV V.GUSEV K.HAMPEL W.HEGAI A.HEISEL M.HEMMER S.HEUSSER G.HOFMANN W.HULT MikaelIOANNUCCI L.Inzhechik L.JANICSKO J.JOCHUM J.JUNKER M.KAZALOV V.KIHM T.KIRPICHNIKOV IKIRSCH A.KLIMENKO A.KNOEPFLE K.t.KOCHETOV O.KUZMINOV V.Kornoukhov V.LAUBENSTEIN M.LAZZARO A.LEBEDEV VLEHNERT B.LIAO H.LINDNER M.LIPPI I.LUBASHEVSKY A.LUBSANDORZHIEV B.LUTTER GUILLAUMEMACOLINO C.MANESCHG W.MARISSENS GerdMEDINACELI E.MISIASZEK M.MOSEEV P.Majorovits B.NEMCHENOK I.NISI S.PALIOSELITIS D.PANAS K.PANDOLA L.PELCZAR K.PESSINA G.PULLIA A.REISSFELDER M.RIBOLDI S.RUMYANTSEVA N.SADA C.SALATHE M.SCHMITT C.SCHNEIDER B.SCHOENERT S.SCHREINER J.SCHULZ O.SCHWINGENHEUER B.SEITZ H.SELIVANENKO O.SHEVCHIK E.SHIRCHENKO M.SIMGEN H.SMOLNIKOV A.STANCO L.STEPANIUK M.STRECKER H.UR C AVANHOEFER L.VASENKO A. A.VERESNIKOVA A.VON STURM K.WAGNER V.WALTER M.WEGMANN A.WESTER T.WIESINGER C.WILSENACH H.WOJCIK M.YANOVICH E.ZAVARISE P.ZHITNIKOV I.ZHUKOV S. V.ZINATULINA D.ZUBER K.ZUZEL G.
Publisher: Elsevier
Publication Year: 2016
JRC N°: JRC103977
ISSN: 2405-6014
URI: http://www.sciencedirect.com/science/article/pii/S2405601415007920
http://publications.jrc.ec.europa.eu/repository/handle/JRC103977
DOI: 10.1016/j.nuclphysbps.2015.09.303
Type: Articles in periodicals and books
Abstract: The GERDA (GERmanium Detector Array) is an experiment for the search of neutrinoless double beta decay (0νββ) in 76Ge, located at Laboratori Nazionali del Gran Sasso of INFN (Italy). In the first phase of the experiment, a 90% confidence level (C.L.) sensitivity of 2.4 · 1025 yr on the 0νββ decay half-life was achieved with a 21.6 kg·yr exposure and an unprecedented background index in the region of interest of 10−2 counts/(keV·kg·yr). No excess of signal events was found, and an experimental lower limit on the half-life of 2.1 · 1025 yr (90% C.L.) was established. Correspondingly, the limit on the effective Majorana neutrino mass is mee < 0.2-0.4 eV, depending on the considered nuclear matrix element. The previous claim for evidence of a 0νββ decay signal is strongly disfavored, and the field of research is open again.
JRC Directorate:Nuclear Safety and Security

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