Pulse shape analysis in Gerda Phase II
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Published:2022-04
Issue:4
Volume:82
Page:
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ISSN:1434-6052
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Container-title:The European Physical Journal C
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language:en
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Short-container-title:Eur. Phys. J. C
Author:
Agostini M., Araujo G., Bakalyarov A. M., Balata M., Barabanov I., Baudis L., Bauer C., Bellotti E., 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., Gangapshev A., Garfagnini A., Gooch C., Grabmayr P., Gurentsov V., Gusev K., Hakenmüller J., Hemmer S., Hiller R., Hofmann W., Huang J., Hult M., Inzhechik L. V., Csáthy J. Janicskó, Jochum J., Junker M., Kazalov V., Kermaïdic Y., Khushbakht H., Kihm T., Kilgus K., Kirsch A., Kirpichnikov I. V., Klimenko A., Knöpfle K. T.ORCID, Kochetov O., Kornoukhov V. N., Krause P., Kuzminov V. V., Laubenstein M., Lazzaro A., Lindner M., Lippi I., Lubashevskiy A., Lubsandorzhiev B., Lutter G., Macolino C., Majorovits B., Maneschg W., Manzanillas L., Miloradovic M., Mingazheva R., Misiaszek M., Müller Y., Nemchenok I., Panas K., Pandola L., Pelczar K., Pertoldi L., Piseri P., Pullia A., Ransom C., Rauscher L., Redchuk M., Riboldi S., Rumyantseva N., Sada C., Salamida F., Schönert S., Schreiner J., Schütt M., Schütz A. -K., Schulz O., Schwarz M., Schwingenheuer B., Selivanenko O., Shevchik E., Shirchenko M., Shtembari L., Simgen H., Smolnikov A., Stukov D., Vasenko A. A., Veresnikova A., Vignoli C., Sturm K. von, Wagner V., 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.,
Abstract
AbstractThe GERmanium Detector Array (Gerda) collaboration searched for neutrinoless double-$$\beta $$
β
decay in $$^{76}$$
76
Ge using isotopically enriched high purity germanium detectors at the Laboratori Nazionali del Gran Sasso of INFN. After Phase I (2011–2013), the experiment benefited from several upgrades, including an additional active veto based on LAr instrumentation and a significant increase of mass by point-contact germanium detectors that improved the half-life sensitivity of Phase II (2015–2019) by an order of magnitude. At the core of the background mitigation strategy, the analysis of the time profile of individual pulses provides a powerful topological discrimination of signal-like and background-like events. Data from regular $$^{228}$$
228
Th calibrations and physics data were both considered in the evaluation of the pulse shape discrimination performance. In this work, we describe the various methods applied to the data collected in Gerda Phase II corresponding to an exposure of 103.7 kg year. These methods suppress the background by a factor of about 5 in the region of interest around $$Q_{\beta \beta }= 2039$$
Q
β
β
=
2039
keV, while preserving $$(81\pm 3)$$
(
81
±
3
)
% of the signal. In addition, an exhaustive list of parameters is provided which were used in the final data analysis.
Funder
Russian Foundation for Basic Research Deutsche Forschungsgemeinschaft Horizon 2020 Framework Programme Bundesministerium für Bildung und Forschung Narodowe Centrum Nauki Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung Max-Planck-Gesellschaft Fundacja na rzecz Nauki Polskiej Science and Technology Facilities Council Instituto Nazionale di Fisica Nucleare
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
Reference35 articles.
1. V. Cirigliano et al., A neutrinoless double beta decay master formula from effective field theory. JHEP 12, 097 (2018) 2. K.H. Ackermann et al. (Gerda collaboration), The GERDA experiment for the search of $$ov\beta \beta $$ decay in 76Ge. Eur. Phys. J. C 73(3), 2330 (2013) 3. M. Agostini et al. (Gerda collaboration), Upgrade for Phase II of the GERDA experiment. Eur. Phys. J. C 78(5), 388 (2018) 4. M. Agostini et al. (Gerda collaboration), Production, characterization and operation of $$^{76}$$Ge enriched BEGe detectors in GERDA. Eur. Phys. J. C 75(2), 39 (2015) 5. M. Agostini et al., (Gerda collaboration), Characterization of 30 $$^{76}$$Ge enriched Broad Energy Ge detectors for GERDA Phase II. Eur. Phys. J. C 79(11), 978 (2019)
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