arXiv · 1909.02522
Modeling of GERDA Phase II data
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.
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GERDA collaboration, Matteo Agostini, Alexander M. Bakalyarov, Marco Balata, Igor Barabanov, Laura Baudis, Christian Bauer, Enrico Bellotti, Sergej Belogurov, Alessandro Bettini, Leonid Bezrukov, Dariusz Borowicz, Elisabetta Bossio, Vikas Bothe, Victor Brudanin, Riccardo Brugnera, Allen Caldwell, Carla Cattadori, Andrey Chernogorov, Tommaso Comellato, Valerio D'Andrea, Elena V. Demidova, Natalia Di Marco, Alexander Domula, Evgenyi Doroshkevich, Viacheslav Egorov, Felix Fischer, Maria Fomina, Albert Gangapshev, Alberto Garfagnini, Chris Gooch, Peter Grabmayr, Valery Gurentsov, Konstantin Gusev, Janina Hakenmüller, Sabine Hemmer, Roman Hiller, Werner Hofmann, Mikael Hult, Lev V. Inzhechik, Jozsef Janicskó Csáthy, Josef Jochum, Matthias Junker, Vladimir Kazalov, Yoann Kermaïdic, Thomas Kihm, Igor V. Kirpichnikov, Alexander Klimenko, Raphael Kneißl, Karl T. Knöpfle, Oleg Kochetov, Vasily N. Kornoukhov, Patrick Krause, Valery V. Kuzminov, Matthias Laubenstein, Andrea Lazzaro, Manfred Lindner, Ivano Lippi, Alexey Lubashevskiy, Bayarto Lubsandorzhiev, Guillaume Lutter, Carla Macolino, Bela Majorovits, Werner Maneschg, Michael Miloradovic, Rizalina Mingazheva, Marcin Misiaszek, Pavel Moseev, Igor Nemchenok, Krysztof Panas, Luciano Pandola, Krysztof Pelczar, Luigi Pertoldi, Paolo Piseri, Alberto Pullia, Chloe Ransom, Stefano Riboldi, Nadezda Rumyantseva, Cinzia Sada, Francesco Salamida, Stefan Schönert, Jochen Schreiner, Mario Schütt, Ann-Katrin Schütz, Oliver Schulz, Mario Schwarz, Bernhard Schwingenheuer, Oleg Selivanenko, Egor Shevchik, Mark Shirchenko, Hardy Simgen, Anatoly Smolnikov, Danila Stukov, Laura Vanhoefer, Andrey A. Vasenko, Anna Veresnikova, Chiara Vignoli, Katharina von Sturm, Thomas Wester, Christoph Wiesinger. 2019-09-05. Modeling of GERDA Phase II data. https://doi.org/10.1007/jhep03(2020)139
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