Title: First results of GERDA Phase II and consistency with background models
Authors: AGOSTINI M.ALLARDT M.BAKALYAROV A.M.BALATA M.BARABANOV I.BAUDIS L.BAUER C.BELLOTTI E.BELOGUROV S.BELYAEV S.T.BENATO G.BETTINI A.BEZRUKOV L.BODE T.BOROWICZ D.BRUDANIN V.BRUGNERA R.CALDWELL A.CATTADORI CCHERNOGOROV A.D'ANDREA V.DEMIDOVA E.V.DI MARCO N.DOMULA A.R.DOROSHKEVICH E.EGOROV V.FALKENSTEIN R.FRODYMA N.GANGAPSHEV A.GARFAGNINI A.GOOCH C.GRABMAYR P.GURENTSOV V.GUSEV K.HAKENMÜLLER J.HEGAI A.HEISEL M.HEMMER S.HOFMANN W.HULT MIKAELINZHECHIK L.JANICSKO J.JOCHUM J.JUNKER M.KAZALOV V.KIHM T.KIRPICHNIKOV IKIRSCH A.KISH A.KLIMENKO A.KNEISSL R.KNOEPFLE K.T.KOCHETOV O.KORNOUKHOV V.KUZMINOV V.LAUBENSTEIN M.LAZZARO A.LEBEDEV VLEHNERT B.LIAO H.LINDNER M.LIPPI I.LUBASHEVSKY A.LUBSANDORZHIEV B.LUTTER GUILLAUMEMACOLINO C.MAJOROVITS B.MANESCHG W.MEDINACELI E.MILORADOVIC M.MINGAZHEVA R.MISIASZEK M.MOSEEV P.NEMCHENOK I.PALIOSELITIS D.PANAS K.PANDOLA L.PELCZAR K.PULLIA A.RIBOLDI S.RUMYANTSEVA N.SADA C.SALAMIDA F.SALATHE M.SCHMITT C.SCHNEIDER B.SCHOENERT S.SCHREINER J.SCHULZ O.SCHÜTZ A. K.SCHWINGENHEUER B.SELIVANENKO O.SHEVCHIK E.SHIRCHENKO M.SIMGEN H.SMOLNIKOV A.STANCO L.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.ZUBER K.ZUZEL G.
Citation: JOURNAL OF PHYSICS: CONFERENCE SERIES vol. 798 no. 012106 p. 6 pp
Publisher: INSTITUTE OF PHYSICS
Publication Year: 2017
JRC N°: JRC106648
ISSN: 1742-6588
URI: http://iopscience.iop.org/article/10.1088/1742-6596/798/1/012106
http://publications.jrc.ec.europa.eu/repository/handle/JRC106648
DOI: 10.1088/1742-6596/798/1/012106
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). GERDA operates bare high purity germanium detectors submersed in liquid Argon (LAr). Phase II of data-taking started in Dec 2015 and is currently ongoing. In Phase II 35 kg of germanium detectors enriched in 76Ge including thirty newly produced Broad Energy Germanium (BEGe) detectors is operating to reach an exposure of 100 kg·yr within about 3 years data taking. The design goal of Phase II is to reduce the background by one order of magnitude to get the sensitivity for ν02/1T = O(1026) yr. To achieve the necessary background reduction, the setup was complemented with LAr veto. Analysis of the background spectrum of Phase II demonstrates consistency with the background models. Furthermore 226Ra and 232Th contamination levels consistent with screening results. In the first Phase II data release we found no hint for a 0νββ decay signal and place a limit of this process ν02/1T> 5.3·1025 yr (90% C.L., sensitivity 4.0·1025 yr). First results of GERDA Phase II will be presented.
JRC Directorate:Nuclear Safety and Security

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