Characterization of inverted coaxial $^{76}$Ge detectors in GERDA for future double-$\beta$ decay experiments
Abstract
Neutrinoless double- decay of Ge is searched for with germanium detectors where source and detector of the decay are identical. For the success of future experiments it is important to increase the mass of the detectors. We report here on the characterization and testing of five prototype detectors manufactured in inverted coaxial (IC) geometry from material enriched to 88% in Ge. IC detectors combine the large mass of the traditional semi-coaxial Ge detectors with the superior resolution and pulse shape discrimination power of point contact detectors which exhibited so far much lower mass. Their performance has been found to be satisfactory both when operated in vacuum cryostat and bare in liquid argon within the GERDA setup. The measured resolutions at the Q-value for double- decay of Ge (Q = 2039 keV) are about 2.1 keV full width at half maximum in vacuum cryostat. After 18 months of operation within the ultra-low background environment of the GERmanium Detector Array (GERDA) experiment and an accumulated exposure of 8.5 kgyr, the background index after analysis cuts is measured to be counts /(keVkgyr) around Q. This work confirms the feasibility of IC detectors for the next-generation experiment LEGEND.
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Cite
@article{arxiv.2103.15111,
title = {Characterization of inverted coaxial $^{76}$Ge detectors in GERDA for future double-$\beta$ decay experiments},
author = {GERDA collaboration and M. Agostini and G. R. 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 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 I. V. Kirpichnikov and A. Klimenko and R. Kneißl and K. T. Knöpfle and O. Kochetov and V. N. Kornoukhov and P. Krause and V. V. Kuzminov and M. Laubenstein 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 P. Moseev and Y. Müller and I. Nemchenok and L. Pandola and K. Pelczar and L. Pertoldi and P. Piseri and A. Pullia and C. Ransom and L. Rauscher 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 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:2103.15111},
year = {2021}
}
Comments
13 pages, 12 figures, submitted to EPJC