Title: Modeling of Gerda Phase II data
Authors: AGOSTINI M.BAKALYAROV A.M.BALATA M.BARABANOV I.BAUDIS L.BAUER C.BELLOTTI E.BELOGUROV S.BETTINI A.BEZRUKOV L.BOROWICZ D.BOSSIO E.BOTHE V.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.FISCHER F.FOMINA M.GANGAPSHEV A.GARFAGNINI A.GOOCH C.GRABMAYR P.GURENTSOV V.GUSEV K.HAKENMÜLLER J.HEMMER S.HILLER R.HOFMANN W.HULT MIKAELINZHECHIK L.JANICSKO J.JOCHUM J.JUNKER M.KAZALOV V.KERMAÏDIC Y.KIHM T.KIRPICHNIKOV IKLIMENKO 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.SALAMIDA F.SCHOENERT S.SCHREINER J.SCHÜTT M.SCHÜTZ A. K.SCHULZ O.SCHWARZ M.SCHWINGENHEUER B.SELIVANENKO O.SHEVCHIK E.SHIRCHENKO M.SIMGEN H.SMOLNIKOV A.STUKOV D.VANHOEFER L.VASENKO A. A.VERESNIKOVA A.VIGNOLI C.VON STURM K.WESTER T.WIESINGER C.WOJCIK M.YANOVICH E.ZATSCHLER B.ZHITNIKOV I.ZHUKOV S. V.ZINATULINA D.ZSCHOCKE A.ZSIGMOND A. J.ZUBER K.ZUZEL G.
Citation: JOURNAL OF HIGH ENERGY PHYSICS vol. 3 p. 139
Publisher: SPRINGER
Publication Year: 2020
JRC N°: JRC119749
ISSN: 1029-8479 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC119749
DOI: 10.1007/JHEP03139
Type: Articles in periodicals and books
Abstract: The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0nbb) decay of 76Ge. The technological challenge of Gerda is to operate in a “background-free” regime in the region of interest (ROI) after analysis cuts for the full 100 kg.yr target exposure of the experiment. A careful modeling and decomposition of the full-range energy spectrum is essential to predict the shape and composition of events in the ROI around Qbb for the 0nbb search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos (2nbb) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for Gerda Phase II. The background model fit yields a flat spectrum in the ROI with a background index (BI) of 16.04 +0.78 -0.85 X 10-3 cts/(keV.kg.yr) for the enriched BEGe data set and 14.68 +0.47 -0.52 X 10-3 cts/(keV.kg.yr) for the enriched coaxial data set. These values are similar to the one of Phase I despite a much larger number of detectors and hence radioactive hardware components.
JRC Directorate:Nuclear Safety and Security

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