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Modeling of GERDA Phase II data

Authors :
GERDA collaboration
Agostini, Matteo
Bakalyarov, Alexander M.
Balata, Marco
Barabanov, Igor
Baudis, Laura
Bauer, Christian
Bellotti, Enrico
Belogurov, Sergej
Bettini, Alessandro
Bezrukov, Leonid
Borowicz, Dariusz
Bossio, Elisabetta
Bothe, Vikas
Brudanin, Victor
Brugnera, Riccardo
Caldwell, Allen
Cattadori, Carla
Chernogorov, Andrey
Comellato, Tommaso
D'Andrea, Valerio
Demidova, Elena V.
Di Marco, Natalia
Domula, Alexander
Doroshkevich, Evgenyi
Egorov, Viacheslav
Fischer, Felix
Fomina, Maria
Gangapshev, Albert
Garfagnini, Alberto
Gooch, Chris
Grabmayr, Peter
Gurentsov, Valery
Gusev, Konstantin
Hakenmüller, Janina
Hemmer, Sabine
Hiller, Roman
Hofmann, Werner
Hult, Mikael
Inzhechik, Lev V.
Csáthy, Jozsef Janicskó
Jochum, Josef
Junker, Matthias
Kazalov, Vladimir
Kermaïdic, Yoann
Kihm, Thomas
Kirpichnikov, Igor V.
Klimenko, Alexander
Kneißl, Raphael
Knöpfle, Karl T.
Kochetov, Oleg
Kornoukhov, Vasily N.
Krause, Patrick
Kuzminov, Valery V.
Laubenstein, Matthias
Lazzaro, Andrea
Lindner, Manfred
Lippi, Ivano
Lubashevskiy, Alexey
Lubsandorzhiev, Bayarto
Lutter, Guillaume
Macolino, Carla
Majorovits, Bela
Maneschg, Werner
Miloradovic, Michael
Mingazheva, Rizalina
Misiaszek, Marcin
Moseev, Pavel
Nemchenok, Igor
Panas, Krysztof
Pandola, Luciano
Pelczar, Krysztof
Pertoldi, Luigi
Piseri, Paolo
Pullia, Alberto
Ransom, Chloe
Riboldi, Stefano
Rumyantseva, Nadezda
Sada, Cinzia
Salamida, Francesco
Schönert, Stefan
Schreiner, Jochen
Schütt, Mario
Schütz, Ann-Katrin
Schulz, Oliver
Schwarz, Mario
Schwingenheuer, Bernhard
Selivanenko, Oleg
Shevchik, Egor
Shirchenko, Mark
Simgen, Hardy
Smolnikov, Anatoly
Stukov, Danila
Vanhoefer, Laura
Vasenko, Andrey A.
Veresnikova, Anna
Vignoli, Chiara
von Sturm, Katharina
Wester, Thomas
Wiesinger, Christoph
Wojcik, Marcin
Yanovich, Evgeny
Zatschler, Birgit
Zhitnikov, Igor
Zhukov, Sergey V.
Zinatulina, Daniya
Zschocke, Andreas
Zsigmond, Anna J.
Zuber, Kai
Zuzel, Grzegorz
Publication Year :
2019

Abstract

The GERmanium Detector Array (GERDA) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta ($0\nu\beta\beta$) decay of $^{76}$Ge. 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$\cdot$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 $Q_{\beta\beta}$ for the $0\nu\beta\beta$ search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos ($2\nu\beta\beta$) 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 $16.04^{+0.78}_{-0.85} \cdot 10^{-3}\,$cts/(kg$\cdot$keV$\cdot$yr) for the enriched BEGe data set and $14.68^{+0.47}_{-0.52} \cdot 10^{-3}\,$cts/(kg$\cdot$keV$\cdot$yr) for the enriched coaxial data set. These values are similar to the one of Gerda Phase I despite a much larger number of detectors and hence radioactive hardware components.

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1909.02522
Document Type :
Working Paper
Full Text :
https://doi.org/10.1007/JHEP03(2020)139