Pulse shape analysis in GERDA Phase II
Abstract
The GERmanium Detector Array (GERDA) collaboration searched for neutrinoless double- decay in 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 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 kgyr. These methods suppress the background by a factor of about 5 in the region of interest around Q = 2039 keV, while preserving (813)% of the signal. In addition, an exhaustive list of parameters is provided which were used in the final data analysis.
Keywords
Cite
@article{arxiv.2202.13355,
title = {Pulse shape analysis in GERDA Phase II},
author = {The GERDA collaboration and M. Agostini and G. Araujo and A. M. Bakalyarov and M. Balata and I. Barabanov and L. Baudis and C. Bauer and E. Bellotti and S. Belogurov and A. Bettini and L. Bezrukov and V. Biancacci and E. Bossio and V. Bothe and V. Brudanin and R. Brugnera and A. Caldwell and C. Cattadori and A. Chernogorov and T. Comellato and V. D'Andrea and E. V. Demidova and N. Di Marco and E. Doroshkevich and F. Fischer and M. Fomina and A. Gangapshev and A. Garfagnini and C. Gooch and P. Grabmayr and V. Gurentsov and K. Gusev and J. Hakenmüller and S. Hemmer and R. Hiller and W. Hofmann and J. Huang and M. Hult and L. V. Inzhechik and J. Janicskó Csáthy and J. Jochum and M. Junker and V. Kazalov and Y. Kermaïdic and H. Khushbakht and T. Kihm and K. Kilgus and A. Kirsch and I. V. Kirpichnikov and A. Klimenko and K. T. Knöpfle and O. Kochetov and V. N. Kornoukhov and P. Krause and V. V. Kuzminov and M. Laubenstein and A. Lazzaro and M. Lindner and I. Lippi and A. Lubashevskiy and B. Lubsandorzhiev and G. Lutter and C. Macolino and B. Majorovits and W. Maneschg and L. Manzanillas and M. Miloradovic and R. Mingazheva and M. Misiaszek and Y. Müller and I. Nemchenok and K. Panas and L. Pandola and K. Pelczar and L. Pertoldi and P. Piseri and A. Pullia and C. Ransom and L. Rauscher and M. Redchuk and S. Riboldi and N. Rumyantseva and C. Sada and F. Salamida and S. Schönert and J. Schreiner and M. Schütt and A. -K. Schütz and O. Schulz and M. Schwarz and B. Schwingenheuer and O. Selivanenko and E. Shevchik and M. Shirchenko and L. Shtembari and H. Simgen and A. Smolnikov and D. Stukov and A. A. Vasenko and A. Veresnikova and C. Vignoli and K. von Sturm and V. Wagner and T. Wester and C. Wiesinger and M. Wojcik and E. Yanovich and B. Zatschler and I. Zhitnikov and S. V. Zhukov and D. Zinatulina and A. Zschocke and A. J. Zsigmond and K. Zuber and G. Zuzel},
journal= {arXiv preprint arXiv:2202.13355},
year = {2022}
}