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1. Modeling of GERDA Phase II data

Author

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, and Zuzel, Grzegorz

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
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.

Published
2019
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2. An improved limit on the neutrinoless double-electron capture of $^{36}$Ar with GERDA

Author

Agostini, M, Alexander, A, Araujo, G R, Bakalyarov, A M, Balata, M, Barabanov, I, Baudis, L, Bauer, C, Belogurov, S, Bettini, A, Bezrukov, L, Biancacci, V, Bossio, E, Bothe, V, Brudanin, V, Brugnera, R, Caldwell, A, Cattadori, C, Chernogorov, A, Comellato, T, D’Andrea, V, Demidova, E V, Marco, N Di, Doroshkevich, E, Fischer, F, Fomina, M, Ransom, Chloe; https://orcid.org/0000-0001-6668-9478, Müller, Y, Huang, J, et al, Agostini, M, Alexander, A, Araujo, G R, Bakalyarov, A M, Balata, M, Barabanov, I, Baudis, L, Bauer, C, Belogurov, S, Bettini, A, Bezrukov, L, Biancacci, V, Bossio, E, Bothe, V, Brudanin, V, Brugnera, R, Caldwell, A, Cattadori, C, Chernogorov, A, Comellato, T, D’Andrea, V, Demidova, E V, Marco, N Di, Doroshkevich, E, Fischer, F, Fomina, M, Ransom, Chloe; https://orcid.org/0000-0001-6668-9478, Müller, Y, Huang, J, and et al

Abstract

The GERmanium Detector Array (Gerda) experiment operated enriched high-purity germanium detectors in a liquid argon cryostat, which contains 0.33% of $^{36}$Ar, a candidate isotope for the two-neutrino double-electron capture (2$\nu $ECEC) and therefore for the neutrinoless double-electron capture (0$\nu $ECEC). If detected, this process would give evidence of lepton number violation and the Majorana nature of neutrinos. In the radiative 0$\nu $ECEC of $^{36}$Ar, a monochromatic photon is emitted with an energy of 429.88 keV, which may be detected by the Gerda germanium detectors. We searched for the $^{36}$Ar 0$\nu $ECEC with Gerda data, with a total live time of 4.34 year (3.08 year accumulated during Gerda Phase II and 1.26 year during Gerda Phase I). No signal was found and a 90% CL lower limit on the half-life of this process was established $T_{1/2} >1.5\cdot 10^{22} $ year.

Published
2024

3. Final Results of GERDA on the Search for Neutrinoless Double-β Decay

Author

Agostini, M, et al, Araujo, G R, Baudis, Laura, Hiller, Roman, Huang, J, Miloradovic, Michael, Mingazheva, Rizalina, Müller, Yanik, Ransom, Chloe, and University of Zurich

Subjects
530 Physics, General Physics and Astronomy, 10192 Physics Institute, 3100 General Physics and Astronomy
Published
2020

5. Energy Calibration for the GERDA Experiment

Author

Ransom, Chloe and Junting Huang

Subjects
Physics::Instrumentation and Detectors, Astrophysics::Instrumentation and Methods for Astrophysics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

GERDA (GERmanium Detector Array) is an experiment conducted at the underground laboratory of LNGS (Laboratori Nazionali del Gran Sasso) to search for neutrinoless double beta decay in Ge76. It uses enriched high-purity germanium diodes both as the sources of the decay and as the detectors. The unparalleled energy resolution of germanium detectors, among other features of the experiment, has placed GERDA as one of the most competitive experiments looking for this decay. In this poster, we present the details of the energy calibration performed in GERDA, including those on the calibration source and its deployment, the energy scale calibration, as well as the energy resolution measurement. The estimations of the systematic uncertainties on the energy scale and resolution are also discussed.

Published
2020
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6. Modeling of GERDA Phase II data

Author

GERDA Collaboration, et al, Baudis, Laura, Hiller, Roman, Miloradovic, Michael, Mingazheva, Rizalina, Ransom, Chloe, and University of Zurich

Subjects
Nuclear and High Energy Physics, 530 Physics, 10192 Physics Institute, 3106 Nuclear and High Energy Physics
Published
2020

7. Characterization of 3076Ge enriched Broad Energy Ge detectors for GERDA Phase II

Author

Baudis, L, Hiller, Roman, Mingazheva, Rizalina, Miloradovic, Michael, Benato, Giovanni, Kish, A, Ransom, Chloe, et al, and University of Zurich

Subjects
Physics and Astronomy (miscellaneous), 530 Physics, 10192 Physics Institute, 2201 Engineering (miscellaneous), 3101 Physics and Astronomy (miscellaneous), Engineering (miscellaneous)
Published
2019

8. Probing Majorana neutrinos with double-β decay

Author

Baudis, Laura, Mingazheva, R, Hiller, Roman, Miloradovic, Michael, Kish, A, Ransom, Chloe, et al, GERDA Collaboration, and University of Zurich

Subjects
1000 Multidisciplinary, Multidisciplinary, 530 Physics, 10192 Physics Institute
Published
2019

9. Modeling of GERDA Phase II data / Working Paper

Author

GERDA Collaboration, et al, Baudis, Laura, Hiller, Roman, Miloradovic, Michael, Mingazheva, Rizalina, Ransom, Chloe, and University of Zurich

Subjects
530 Physics, 10192 Physics Institute
Published
2019

10. Characterization of 3076Ge enriched Broad Energy Ge detectors for GERDA Phase II

Author

Baudis, L; https://orcid.org/0000-0003-4710-1768, Hiller, Roman, Mingazheva, Rizalina, Miloradovic, Michael, Benato, Giovanni, Kish, A, Ransom, Chloe, et al, Baudis, L; https://orcid.org/0000-0003-4710-1768, Hiller, Roman, Mingazheva, Rizalina, Miloradovic, Michael, Benato, Giovanni, Kish, A, Ransom, Chloe, and et al

Abstract

The GERmanium Detector Array (Gerda) is a low background experiment located at the Laboratori Nazionali del Gran Sasso in Italy, which searches for neutrinoless double-beta decay of 76Ge into 76Se + 2e−. Gerda has been conceived in two phases. Phase II, which started in December 2015, features several novelties including 30 new 76Ge enriched detectors. These were manufactured according to the Broad Energy Germanium (BEGe) detector design that has a better background discrimination capability and energy resolution compared to formerly widely-used types. Prior to their installation, the new BEGe detectors were mounted in vacuum cryostats and characterized in detail in the Hades underground laboratory in Belgium. This paper describes the properties and the overall performance of these detectors during operation in vacuum. The characterization campaign provided not only direct input for GerdaPhase II data collection and analyses, but also allowed to study detector phenomena, detector correlations as well as to test the accuracy of pulse shape simulation codes.

Published
2019

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