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1. Characterization of inverted coaxial

Author

M, Agostini, G, Araujo, A M, Bakalyarov, M, Balata, I, Barabanov, L, Baudis, C, Bauer, E, Bellotti, S, Belogurov, A, Bettini, L, Bezrukov, V, Biancacci, E, Bossio, V, Bothe, V, Brudanin, R, Brugnera, A, Caldwell, C, Cattadori, A, Chernogorov, T, Comellato, V, D'Andrea, E V, Demidova, N Di, Marco, E, Doroshkevich, F, Fischer, M, Fomina, A, Gangapshev, A, Garfagnini, C, Gooch, P, Grabmayr, V, Gurentsov, K, Gusev, J, Hakenmüller, S, Hemmer, W, Hofmann, J, Huang, M, Hult, L V, Inzhechik, J, Janicskó Csáthy, J, Jochum, M, Junker, V, Kazalov, Y, Kermaïdic, H, Khushbakht, T, Kihm, I V, Kirpichnikov, A, Klimenko, R, Kneißl, K T, Knöpfle, O, Kochetov, V N, Kornoukhov, P, Krause, V V, Kuzminov, M, Laubenstein, M, Lindner, I, Lippi, A, Lubashevskiy, B, Lubsandorzhiev, G, Lutter, C, Macolino, B, Majorovits, W, Maneschg, L, Manzanillas, M, Miloradovic, R, Mingazheva, M, Misiaszek, P, Moseev, Y, Müller, I, Nemchenok, L, Pandola, K, Pelczar, L, Pertoldi, P, Piseri, A, Pullia, C, Ransom, L, Rauscher, S, Riboldi, N, Rumyantseva, C, Sada, F, Salamida, S, Schönert, J, Schreiner, M, Schütt, A-K, Schütz, O, Schulz, M, Schwarz, B, Schwingenheuer, O, Selivanenko, E, Shevchik, M, Shirchenko, L, Shtembari, H, Simgen, A, Smolnikov, D, Stukov, A A, Vasenko, A, Veresnikova, C, Vignoli, K, von Sturm, T, Wester, C, Wiesinger, M, Wojcik, E, Yanovich, B, Zatschler, I, Zhitnikov, S V, Zhukov, D, Zinatulina, A, Zschocke, A J, Zsigmond, K, Zuber, and G, Zuzel

Subjects
Special Article – Tools for Experiment and Theory
Abstract

Neutrinoless double-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\beta $$\end{document}β decay of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^{76}$$\end{document}76Ge 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 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^{76}$$\end{document}76Ge. 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-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\beta $$\end{document}β decay of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^{76}$$\end{document}76Ge (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$Q_{\beta \beta }$$\end{document}Qββ = 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 kg\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\cdot $$\end{document}·year, the background index after analysis cuts is measured to be \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$4.9^{+7.3}_{-3.4}\times 10^{-4} \ \text {counts}/(\text {keV} \cdot \text {kg} \cdot \text {year})$$\end{document}4.9-3.4+7.3×10-4counts/(keV·kg·year) around \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$Q_{\beta \beta }$$\end{document}Qββ. This work confirms the feasibility of IC detectors for the next-generation experiment Legend.

Published
2021

2. Final Results of GERDA on the Search for Neutrinoless Double-ß Decay

Author

V. I. Gurentsov, Bayarto Lubsandorzhiev, A. Lubashevskiy, T. Wester, A. A. Vasenko, A.A. Smolnikov, J. Huang, O.I. Kochetov, J. Janicskó Csáthy, R. Mingazheva, C. Cattadori, Anna Julia Zsigmond, Kai Zuber, A. M. Gangapshev, B. Schwingenheuer, R. Brugnera, V. V. Kuzminov, Matteo Agostini, V. V. Kazalov, O. Schulz, E. Doroshkevich, Franz Dieter Fischer, A.-K. Schütz, I. Zhitnikov, I. V. Kirpichnikov, Werner Hofmann, N. Di Marco, Paolo Piseri, G. R. Araujo, D. R. Zinatulina, A. Lazzaro, D. Stukov, M. Schwarz, M. Miloradovic, Allen Caldwell, A. Garfagnini, W. Maneschg, S. Schönert, Josef Jochum, E. A. Yanovich, M. Balata, C. Bauer, Stefano Riboldi, L. Shtembari, F. Salamida, Manfred Lindner, V.B. Brudanin, C. Ransom, Hardy Simgen, I. R. Barabanov, V. D'Andrea, C. Gooch, S. V. Zhukov, P. Krause, Igor Nemchenok, Mikael Hult, K. Panas, K. von Sturm, Bela Majorovits, K. N. Gusev, J. Hakenmüller, M. Misiaszek, R. Kneißl, K. T. Knöpfle, L. Manzanillas, E. V. Demidova, T. Comellato, L. Pertoldi, S. Hemmer, Y. Kermaïdic, Laura Baudis, A. Pullia, G. Zuzel, O. Selivanenko, S. Belogurov, Ivano Lippi, C. Wiesinger, A. V. Veresnikova, M. Shirchenko, A. Chernogorov, M. Fomina, R. Hiller, E. Bossio, M. Schütt, D. Borowicz, L. V. Inzhechik, Cinzia Sada, B. Zatschler, P. Grabmayr, Alessandro Bettini, Y. Müller, C. Macolino, V. Bothe, V. N. Kornoukhov, K. Pelczar, M. Junker, C. Vignoli, Guillaume Lutter, A. M. Bakalyarov, L. Rauscher, A. Zschocke, Jochen Schreiner, V. Biancacci, L. B. Bezrukov, E. Shevchik, M. M. Wojcik, E. Bellotti, Th. Kihm, H. Khushbakht, P. Moseev, Luciano Pandola, A. A. Klimenko, N. Rumyantseva, M. Laubenstein, and GERDA collaboration

Subjects
Physics, Physics - Instrumentation and Detectors, Signal region, General Physics and Astronomy, chemistry.chemical_element, Germanium, 7. Clean energy, 01 natural sciences, Cosmology, High Energy Physics - Experiment, 3. Good health, Semiconductor detector, Nuclear physics, chemistry, GE-76, 0103 physical sciences, GERDA - Abteilung Hinton, Liquid argon, Beta (velocity), SHAPE, High Energy Physics::Experiment, Sensitivity (control systems), 010306 general physics, Nuclear Experiment, Diode
Abstract

The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-$\beta$ ($0\nu\beta\beta$) decay of $^{76}$Ge, whose discovery would have far-reaching implications in cosmology and particle physics. By operating bare germanium diodes, enriched in $^{76}$Ge, in an active liquid argon shield, GERDA achieved an unprecedently low background index of $5.2\times10^{-4}$ counts/(keV$\cdot$kg$\cdot$yr) in the signal region and met the design goal to collect an exposure of 100 kg$\cdot$yr in a background-free regime. When combined with the result of Phase I, no signal is observed after 127.2 kg$\cdot$yr of total exposure. A limit on the half-life of $0\nu\beta\beta$ decay in $^{76}$Ge is set at $T_{1/2}>1.8\times10^{26}$ yr at 90% C.L., which coincides with the sensitivity assuming no signal., Comment: 7 pages, 3 figures, submitted to Physical Review Letters

Published
2020

3. First Search for Bosonic Superweakly Interacting Massive Particles with Masses up to 1 MeV/c2 with GERDA

Author

K. Panas, M. M. Wojcik, V. N. Kornoukhov, K. Pelczar, A.-K. Schütz, E. Bellotti, L. B. Bezrukov, E. Shevchik, N. Di Marco, Alessandro Bettini, Manfred Lindner, W. Maneschg, Guillaume Lutter, A. M. Bakalyarov, E. A. Yanovich, T. Wester, A.A. Smolnikov, O.I. Kochetov, Laura Baudis, C. Cattadori, Anna Julia Zsigmond, V. G. Egorov, Kai Zuber, R. Brugnera, O. Selivanenko, R. Mingazheva, Th. Kihm, M. Balata, A. A. Vasenko, V. V. Kuzminov, Matteo Agostini, L. Rauscher, B. Schwingenheuer, M. Junker, Werner Hofmann, V. I. Gurentsov, A. Zschocke, V. Bothe, Paolo Piseri, Allen Caldwell, A. M. Gangapshev, E. Doroshkevich, I. V. Kirpichnikov, H. Khushbakht, P. Moseev, Jochen Schreiner, P. Grabmayr, Luciano Pandola, Bayarto Lubsandorzhiev, L. V. Inzhechik, C. Vignoli, A. Lazzaro, M. Miloradovic, K. von Sturm, A. A. Klimenko, L. Pertoldi, M. Schwarz, A. Garfagnini, O. Schulz, A. Pullia, K. N. Gusev, A. Lubashevskiy, N. Rumyantseva, K. T. Knöpfle, C. Macolino, Cinzia Sada, V.B. Brudanin, C. Ransom, Hardy Simgen, B. Zatschler, I. R. Barabanov, C. Gooch, R. Kneißl, S. V. Zhukov, Josef Jochum, S. Schönert, V. V. Kazalov, Franz Dieter Fischer, T. Comellato, M. Laubenstein, A. V. Veresnikova, A. Chernogorov, R. Hiller, G. Zuzel, P. Krause, Y. Kermaïdic, Ivano Lippi, J. Hakenmüller, C. Wiesinger, M. Shirchenko, V. D'Andrea, M. Fomina, D. Stukov, E. Bossio, F. Salamida, C. Bauer, Stefano Riboldi, M. Misiaszek, M. Schütt, D. Borowicz, J. Janicskó Csáthy, I. Zhitnikov, Igor Nemchenok, Bela Majorovits, E. V. Demidova, S. Belogurov, D. R. Zinatulina, Mikael Hult, and S. Hemmer

Subjects
Physics, Particle physics, 2019-20 coronavirus outbreak, Photon, Coronavirus disease 2019 (COVID-19), Physics::Instrumentation and Detectors, Dark matter, General Physics and Astronomy, chemistry.chemical_element, Germanium, Electron, 7. Clean energy, 01 natural sciences, Pseudoscalar, chemistry, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Dimensionless quantity
Abstract

We present the first search for bosonic superweakly interacting massive particles (super-WIMPs) as keV-scale dark matter candidates performed with the GERDA experiment. GERDA is a neutrinoless double-s decay experiment which operates high-purity germanium detectors enriched in ^{76}Ge in an ultralow background environment at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN in Italy. Searches were performed for pseudoscalar and vector particles in the mass region from 60 keV/c^{2} to 1 MeV/c^{2}. No evidence for a dark matter signal was observed, and the most stringent constraints on the couplings of super-WIMPs with masses above 120 keV/c^{2} have been set. As an example, at a mass of 150 keV/c^{2} the most stringent direct limits on the dimensionless couplings of axionlike particles and dark photons to electrons of g_{ae}

Published
2020

4. Modeling of GERDA Phase II data

Author

A. Domula, M. Schwarz, Laura Baudis, C. Wiesinger, Paolo Piseri, M. Shirchenko, A. Lazzaro, E. Bossio, I. V. Kirpichnikov, Alessandro Bettini, D. R. Zinatulina, M. Miloradovic, E. V. Demidova, A. V. Veresnikova, A. Chernogorov, R. Hiller, R. Kneißl, S. Belogurov, V. D'Andrea, Stefano Riboldi, V.B. Brudanin, C. Ransom, Igor Nemchenok, M. Schütt, M. Misiaszek, Cinzia Sada, B. Zatschler, Bela Majorovits, C. Macolino, Hardy Simgen, W. Maneschg, E. A. Yanovich, P. Moseev, Luciano Pandola, A. A. Klimenko, C. Vignoli, R. Brugnera, Mikael Hult, D. Borowicz, K. N. Gusev, Jochen Schreiner, L. Pertoldi, F. Fischer, Josef Jochum, N. Rumyantseva, V. V. Kuzminov, Matteo Agostini, V. I. Gurentsov, S. Hemmer, Y. Kermaïdic, J. Janicskó Csáthy, Stefan Schönert, E. Doroshkevich, Bayarto Lubsandorzhiev, L. V. Inzhechik, Ivano Lippi, Manfred Lindner, E. Bellotti, T. Wester, A.A. Smolnikov, K. Panas, I. Zhitnikov, V. Bothe, C. Cattadori, Anna Julia Zsigmond, Kai Zuber, A. Zschocke, L. B. Bezrukov, E. Shevchik, A.-K. Schütz, Marcin Wójcik, V. N. Kornoukhov, M. Fomina, P. Grabmayr, K. Pelczar, N. Di Marco, O.I. Kochetov, Guillaume Lutter, A. M. Bakalyarov, I. R. Barabanov, A. M. Gangapshev, C. Gooch, S. V. Zhukov, Thomas Kihm, O. Selivanenko, R. Mingazheva, B. Schwingenheuer, M. Junker, Oliver Schulz, Alberto Pullia, V. G. Egorov, M. Balata, A. Garfagnini, K. T. Knöpfle, T. Comellato, L. Vanhoefer, Matthias Laubenstein, G. Zuzel, V. V. Kazalov, P. Krause, A. A. Vasenko, Christian Bauer, A. Lubashevskiy, J. Hakenmüller, D. Stukov, Werner Hofmann, F. Salamida, Allen Caldwell, and K. von Sturm

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Spectrum (functional analysis), Detector, Phase (waves), FOS: Physical sciences, Order (ring theory), Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Semiconductor detector, ddc, Region of interest, 0103 physical sciences, Dark Matter and Double Beta Decay (experiments), lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, DOUBLE-BETA DECAY, Sensitivity (control systems), Nuclear Experiment (nucl-ex), Neutrino, 010306 general physics, Nuclear Experiment
Abstract

The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0νββ) decay of 76Ge. 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·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 Qββ for the 0νββ search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos (2νββ) 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 $$ {16.04}_{-0.85}^{+0.78}\cdotp {10}^{-3} $$ 16.04 − 0.85 + 0.78 · 10 − 3 cts/(keV·kg·yr) for the enriched BEGe data set and $$ {14.68}_{-0.52}^{+0.47}\cdotp {10}^{-3} $$ 14.68 − 0.52 + 0.47 · 10 − 3 cts/(keV·kg·yr) for the enriched coaxial data set. These values are similar to the one of Phase I despite a much larger number of detectors and hence radioactive hardware components.

Published
2019

5. Searching for neutrinoless double beta decay with GERDA

Author

S. Hemmer, V. N. Kornoukhov, Matthias Laubenstein, K. Pelczar, V. G. Egorov, K. T. Knöpfle, R. Brugnera, M. Balata, A. A. Vasenko, Guillaume Lutter, T. Wester, A. M. Bakalyarov, V. I. Lebedev, A.A. Smolnikov, A. Lazzaro, V. V. Kuzminov, Matteo Agostini, C. Wiesinger, L. Vanhoefer, Thomas Kihm, B. Schneider, Anna Julia Zsigmond, M. Shirchenko, E. Doroshkevich, Manfred Lindner, L. B. Bezrukov, Oliver Schulz, Kai Zuber, C. Macolino, L. Stanco, V. V. Kazalov, E. Shevchik, O.I. Kochetov, G. Zuzel, R. Falkenstein, H. V. Kirpichnikov, Jochen Schreiner, Alberto Pullia, A. Garfagnini, D. R. Zinatulina, O. Selivanenko, V.B. Brudanin, C. Ransom, J. Janicsko, A.-K. Schütz, Hardy Simgen, Werner Hofmann, Allen Caldwell, M. Miloradovic, V. I. Gurentsov, K. N. Gusev, A. Hegai, K. Panas, T. Bode, A. Kish, A. M. Gangapshev, Marcin Wójcik, N. Di Marco, R. Mingazheva, Christian Bauer, A. Lubashevskiy, A. Domula, R. Kneiβl, Cinzia Sada, M. Junker, J. Hakenmüller, P. Grabmayr, B. Schwingenheuer, K. von Sturm, Mikael Hult, R. Hiller, Stefano Riboldi, E. Bellotti, Bayarto Lubsandorzhiev, Stefan Schönert, C. Gooch, P. Moseev, Luciano Pandola, V. Wagner, I. Zhitnikov, I. R. Barabanov, Laura Baudis, M. Misiaszek, A. A. Klimenko, M. Heisel, N. Rumyantseva, F. Salamida, S. V. Zhukov, Alessandro Bettini, B. Cattadori, A. Kirsch, Y. Kermaïdic, V. D'Andrea, Ivano Lippi, L. V. Inzhechik, W. Maneschg, E. A. Yanovich, C. Schmitt, A. V. Veresnikova, A. Chernogorov, J. Jochum Csáthy, A. Wegmann, Igor Nemchenok, Bela Majorovits, E. V. Demidova, and S. Belogurov

Subjects
Paper, Physics, History, Particle physics, Physics - Instrumentation and Detectors, Double beta decay, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Nuclear Experiment, ddc, Computer Science Applications, Education
Abstract

The GERmanium Detector Array (GERDA) experiment located at the INFN Gran Sasso Laboratory (Italy), is looking for the neutrinoless double beta decay of Ge76, by using high-purity germanium detectors made from isotopically enriched material. The combination of the novel experimental design, the careful material selection for radio-purity and the active/passive shielding techniques result in a very low residual background at the Q-value of the decay, about 1e-3 counts/(keV kg yr). This makes GERDA the first experiment in the field to be background-free for the complete design exposure of 100 kg yr. A search for neutrinoless double beta decay was performed with a total exposure of 47.7 kg yr: 23.2 kg yr come from the second phase (Phase II) of the experiment, in which the background is reduced by about a factor of ten with respect to the previous phase. The analysis presented in this paper includes 12.4 kg yr of new Phase II data. No evidence for a possible signal is found: the lower limit for the half-life of Ge76 is 8.0e25 yr at 90% CL. The experimental median sensitivity is 5.8e25 yr. The experiment is currently taking data. As it is running in a background-free regime, its sensitivity grows linearly with exposure and it is expected to surpass 1e26 yr within 2018., 8 pages, to appear in the proceedings of TAUP2017

Published
2020

6. Improved Limit on Neutrinoless Double- β Decay of Ge76 from GERDA Phase II

Author

L. V. Inzhechik, D. R. Zinatulina, O. Schulz, Mikael Hult, T. Comellato, V. G. Egorov, M. Balata, V. Wagner, G. Zuzel, L. Vanhoefer, C. Bauer, A. A. Vasenko, T. Bode, Stefano Riboldi, A.-K. Schütz, A. Hegai, N. Di Marco, M. Misiaszek, F. Salamida, R. Brugnera, A. Garfagnini, V. V. Kuzminov, Matteo Agostini, Manfred Lindner, J. Janicskó Csáthy, V. N. Kornoukhov, Y. Kermaïdic, A. Kish, K. Pelczar, A. V. Veresnikova, J. Hakenmüller, I. Zhitnikov, Ivano Lippi, Allen Caldwell, A. Chernogorov, M. Junker, C. Wiesinger, A. Wegmann, M. Shirchenko, R. Hiller, L. Pertoldi, Igor Nemchenok, Guillaume Lutter, A. Kirsch, O. Selivanenko, A. M. Bakalyarov, A. Lubashevskiy, W. Maneschg, S. Hemmer, M. Laubenstein, E. A. Yanovich, K. von Sturm, Bela Majorovits, R. Falkenstein, P. Grabmayr, B. Schneider, I. V. Kirpichnikov, V. I. Gurentsov, V. V. Kazalov, M. Miloradovic, D. Borowicz, J. Biernat, Bayarto Lubsandorzhiev, R. Mingazheva, C. Schmitt, B. Schwingenheuer, R. Kneißl, O.I. Kochetov, Th. Kihm, A. M. Gangapshev, P. Moseev, Luciano Pandola, A. A. Klimenko, Werner Hofmann, M. Heisel, N. Rumyantseva, A. Zschocke, Alessandro Bettini, E. V. Demidova, S. Belogurov, C. Macolino, A. Pullia, Cinzia Sada, V. D'Andrea, A. Lazzaro, S. Schönert, K. Panas, T. Wester, A.A. Smolnikov, C. Cattadori, Anna Julia Zsigmond, Kai Zuber, M. M. Wojcik, E. Bellotti, E. Doroshkevich, L. B. Bezrukov, E. Shevchik, A. Domula, L. Stanco, V.B. Brudanin, C. Ransom, Hardy Simgen, Josef Jochum, I. R. Barabanov, S. V. Zhukov, K. N. Gusev, K. T. Knöpfle, and Laura Baudis

Subjects
Semileptonic decay, Physics, 010308 nuclear & particles physics, Phase (waves), General Physics and Astronomy, chemistry.chemical_element, Germanium, Type (model theory), 01 natural sciences, chemistry, Double beta decay, 0103 physical sciences, Sensitivity (control systems), Atomic physics, 010306 general physics, Energy (signal processing), Diode
Abstract

The GERDA experiment searches for the lepton-number-violating neutrinoless double-β decay of ^{76}Ge (^{76}Ge→^{76}Se+2e^{-}) operating bare Ge diodes with an enriched ^{76}Ge fraction in liquid argon. The exposure for broad-energy germanium type (BEGe) detectors is increased threefold with respect to our previous data release. The BEGe detectors feature an excellent background suppression from the analysis of the time profile of the detector signals. In the analysis window a background level of 1.0_{-0.4}^{+0.6}×10^{-3} counts/(keV kg yr) has been achieved; if normalized to the energy resolution this is the lowest ever achieved in any 0νββ experiment. No signal is observed and a new 90% C.L. lower limit for the half-life of 8.0×10^{25} yr is placed when combining with our previous data. The expected median sensitivity assuming no signal is 5.8×10^{25} yr.

Published
2018

7. Search for Neutrinoless Double Beta Decay with the GERDA experiment: Phase II

Author

Christian Bauer, A. Lubashevskiy, Oliver Schulz, Alberto Pullia, V. I. Gurentsov, I. R. Barabanov, M. Heisel, C. Macolino, A. Garfagnini, S. V. Zhukov, M. Balata, Bayarto Lubsandorzhiev, J. Schreiner, L. Vanhoefer, T. Bode, E. Doroshkevich, R. Brugnera, M. Salathe, V. V. Kazalov, V. V. Kuzminov, J. Janicsko, Manfred Lindner, T. Wester, Matteo Agostini, A.A. Smolnikov, D. R. Zinatulina, Matthias Laubenstein, C. Cattadori, Kai Zuber, Allen Caldwell, Ivano Lippi, V. Egorov, Josef Jochum, D. Palioselitis, A. Kish, S. Schoenert, K. N. Gusev, A. K. Schuetz, E. Medinaceli, V. Wagner, O. Selivanenko, J. Janicskó Csáthy, Marcin Wójcik, V. D'Andrea, W. Maneschg, C. Gooch, E. A. Yanovich, K. T. Knoepfle, Cinzia Sada, P. Grabmayr, Stefano Riboldi, A. A. Vasenko, K. von Sturm, Giovanni Benato, A. Lazzaro, A. Domula, A. Hegai, E. V. Demidova, Mikael Hult, I. Zhitnikov, M. Misiaszek, B. Schwingenheuer, B. Lehnert, G. Zuzel, C. Wiesinger, R. Mingazheva, M. Shirchenko, M. Allardt, N. Di Marco, V. I. Lebedev, V.B. Brudanin, Hardy Simgen, V. N. Kornoukhov, K. Pelczar, S. Hemmer, Alessandro Bettini, P. Moseev, Luciano Pandola, R. Kneissl, A. Kirsch, S. Belogurov, A. A. Klimenko, Laura Baudis, A. V. Veresnikova, J. Hakenmüller, Guillaume Lutter, A. M. Bakalyarov, D. Borowicz, A. Chernogorov, N. Rumyantseva, K. Panas, B. Schneider, H. Y. Liao, Werner Hofmann, R. Falkenstein, I. V. Kirpichnikov, Luca Stanco, C. Schmitt, M. Miloradovic, A. Wegmann, Igor Nemchenok, F. Salamida, Bela Majorovits, M. Junker, L. B. Bezrukov, E. Shevchik, Thomas Kihm, E. Bellotti, N. Frodyma, O.I. Kochetov, S. T. Belyaev, A. M. Gangapshev, and L. V. Inzhechik

Subjects
Nuclear physics, Physics, chemistry, Double beta decay, Liquid argon, Underground laboratory, Phase (waves), chemistry.chemical_element, Germanium, Sensitivity (control systems), Energy (signal processing), Semiconductor detector
Abstract

The GERmanium Detector Array (GERDA) experiment, located at the Gran Sasso underground laboratory in Italy, is built for the search of $0\nu\beta\beta$ decay in $^{76}$Ge. GERDA operates bare high purity germanium detectors submersed in liquid Argon (LAr). Phase I of the experiment was completed reaching an exposure of about 21 kg$\cdot$yr with a background level of $10^{-2}$ cts/(ke V $\cdot$ kg $\cdot$ yr). GERDA Phase I set a limit on the $0\nu\beta\beta$ decay of $^{76}$Ge of $T_{1/2}^{0\nu} > 2.1 \cdot 10^{25}$ yr. In Phase II 35 kg of germanium detectors enriched in $^{76}$Ge are operated to reach an exposure of 100 kg$\cdot$yr. The design goal is to reduce the background by one order of magnitude to reach the sensitivity for $T_{1/2}^{0\nu} = \mathcal{O} (10^{26} )$ yr. The Phase II setup comprises thirty newly produced Broad Energy Germanium (BEGe) detectors. They contribute to the background reduction with better energy resolution and enhanced pulse shape discrimination. To achieve the necessary background reduction, the setup was complemented with LAr veto. The hardware upgrade for Phase II was finished and all detectors were deployed in December 2015. We present the first results of Phase II with 10.8 kg$\cdot$yr exposure reached in June 2016.

Published
2017

8. Limit on the radiative neutrinoless double electron capture of $$^{36}$$ 36 Ar from GERDA Phase I

Author

Marc Walter, O.I. Kochetov, J. Janicskó Csáthy, D. Palioselitis, S. T. Belyaev, A. M. Gangapshev, H. Wilsenach, V. I. Gurentsov, R. Brugnera, C. Wiesinger, M. Stepaniuk, M. Heisel, V. V. Kuzminov, Matteo Agostini, B. Lehnert, I. Zhitnikov, A. Domula, C. Macolino, R. Mingazheva, Bayarto Lubsandorzhiev, M. Shirchenko, K. Freund, L. V. Inzhechik, L. B. Bezrukov, B. Schwingenheuer, Oliver Schulz, A. V. Veresnikova, M. Balata, E. Doroshkevich, O. Fedorova, A. Chernogorov, E. V. Demidova, V.B. Brudanin, A. Lazzaro, Alberto Pullia, Hardy Simgen, I. V. Kirpichnikov, E. Medinaceli, I. R. Barabanov, N. Frodyma, A. Garfagnini, M. Miloradovic, W. Maneschg, E. A. Yanovich, S. V. Zhukov, Alessandro Bettini, V. Egorov, S. Belogurov, A.-K. Schütz, V. I. Lebedev, J. Schreiner, A. Hegai, G. Heusser, A. Kirsch, Marcin Wójcik, P. Grabmayr, N. Barros, M. Salathe, L. Vanhoefer, T. Bode, K. T. Knöpfle, Cinzia Sada, Manfred Lindner, P. Moseev, S. Hemmer, Luciano Pandola, R. Kneißl, Matthias Laubenstein, Giovanni Benato, A. A. Klimenko, N. Rumyantseva, V. Wagner, A. Wegmann, O. Selivanenko, C. Gooch, Igor Nemchenok, A. A. Vasenko, K. N. Gusev, B. Schneider, Bela Majorovits, Thomas Kihm, Josef Jochum, V. V. Kazalov, D. R. Zinatulina, G. Zuzel, Ivano Lippi, V. D'Andrea, A. Kish, Mikael Hult, J. Hakenmüller, Stefano Riboldi, K. Panas, M. Misiaszek, M. Allardt, E. Bellotti, A. di Vacri, Werner Hofmann, Allen Caldwell, Luca Stanco, F. Salamida, K. von Sturm, T. Wester, A.A. Smolnikov, C. Cattadori, Kai Zuber, D. Borowicz, Christian Bauer, A. Lubashevskiy, Stefan Schönert, M. Junker, Laura Baudis, V. N. Kornoukhov, H. Y. Liao, K. Pelczar, Guillaume Lutter, A. M. Bakalyarov, R. Falkenstein, and C. Schmitt

Subjects
Physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Electron capture, High Energy Physics::Phenomenology, Phase (waves), chemistry.chemical_element, Germanium, Physics::Data Analysis, Statistics and Probability, 01 natural sciences, 7. Clean energy, Lepton number, Semiconductor detector, Nuclear physics, MAJORANA, chemistry, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous)
Abstract

Neutrinoless double electron capture is a process that, if detected, would give evidence of lepton number violation and the Majorana nature of neutrinos. A search for neutrinoless double electron capture of $^{36}$Ar has been performed with germanium detectors installed in liquid argon using data from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory of INFN, Italy. No signal was observed and an experimental lower limit on the half-life of the radiative neutrinoless double electron capture of $^{36}$Ar was established: $T_{1/2} > $ 3.6 $\times$ 10$^{21}$ yr at 90 % C.I.

Published
2016

9. New Data Release of GERDA Phase II: Search for 0νββ Decay of 76Ge

Author

Igor Nemchenok, Bela Majorovits, M Agostini, Mikael Hult, I V Kirpichnikov, O. Schulz, A Garfagnini, Allen Caldwell, Manfred Lindner, S. Hemmer, Y. Kermaïdic, A Chernogorov, A. Lubashevskiy, P Moseev, Ivano Lippi, C. Gooch, R. Mingazheva, Th. Kihm, E. Shevchik, R. Kneißl, V. Egorov, O Selivanenko, R Falkenstein, L Bezrukov, A Lazzaro, V.B. Brudanin, C Sada, M Balata, O.I. Kochetov, A. M. Gangapshev, A A Vasenko, C. Bauer, A.-K. Schütz, Hardy Simgen, Luciano Pandola, A. Hegai, B Schneider, S Belogurov, B. Schwingenheuer, E V Demidova, S Riboldi, M Junker, Luca Stanco, N. Di Marco, V V Kuzminov, J. Janicsko Csathy, N Rumyantseva, A. A. Klimenko, A Pullia, A Kish, M. Heisel, V N Kornoukhov, A Domula, M. Misiaszek, E Doroshkevich, A Bettini, Matthias Laubenstein, V Kazalov, Guillaume Lutter, A. M. Bakalyarov, M. Shirchenko, B Lubsandorzhiev, J. Hakenmüller, R. Hiller, K. Panas, L. Vanhoefer, A. Kirsch, C Schmitt, Jochen Schreiner, T. Bode, W. Maneschg, P. Grabmayr, C. Ransom, K. N. Gusev, R Brugnera, K. T. Knöpfle, L V Inzhechik, S. Schönert, Laura Baudis, I Barabanov, J. Jochum, M. Miloradovic, E Bellotti, Werner Hofmann, V D’Andrea, C Macolino, F Salamida, V Gurentsov, A.A. Smolnikov, and C. Cattadori

Subjects
Physics, Nuclear physics, chemistry, Isotope, Double beta decay, Detector, Phase (waves), chemistry.chemical_element, Germanium, Cryogenics, Data release, Semiconductor detector
Abstract

The GERmanium Detector Array (GERDA) experiment is searching for the neutrinoless double beta decay ( 0νββ ) of the isotope 76 Ge. High-purity germanium crystals enriched in 76 Ge, simultaneously used as source and detector, are directly deployed into ultra-pure, cryogenic liquid argon, which acts both as cooling medium and shield against the external radiation. The second phase of the experiment is taking data since end of 2015 with 20 additional kg of custom-made BEGe-type Germanium detectors and an active LAr veto. In this paper we will summarize the results of the last data release of June 2017. No evidence for a possible signal is found: the lower limit for the half-life of 76 Ge is 8.0·1025 yr at 90% CL. The very low residual background found at the Q -value of the decay, about 10-3 cts/(keV · kg · yr), makes Gerda the first experiment in the field to be background-free for the complete design exposure of 100 kg · yr.

Published
2018

10. GERDA results and the future perspectives for the neutrinoless double beta decay search using 76Ge

Author

A. Domula, Allen Caldwell, K. von Sturm, J. Janicskó Csáthy, C. Macolino, A. V. Veresnikova, V.B. Brudanin, Hardy Simgen, A. Chernogorov, V. N. Kornoukhov, K. Pelczar, Christian Bauer, Oliver Schulz, Alberto Pullia, P. Moseev, Luciano Pandola, I. R. Barabanov, I. Zhitnikov, E. Doroshkevich, A. Lubashevskiy, A. A. Klimenko, N. Rumyantseva, Guillaume Lutter, R. Mingazheva, A. M. Bakalyarov, A. Garfagnini, I. V. Kirpichnikov, W. Maneschg, E. A. Yanovich, O.I. Kochetov, S. Hemmer, Matthias Laubenstein, R. Hiller, A. M. Gangapshev, J. Schreiner, Stefano Riboldi, M. Balata, V. Wagner, Alessandro Bettini, E. V. Demidova, B. Schneider, E. Shevchik, R. Kneißl, M. Misiaszek, A. A. Vasenko, V. Egorov, V. I. Gurentsov, L. Vanhoefer, T. Bode, M. Heisel, A. Kirsch, Marcin Wójcik, P. Grabmayr, Y. Kermaïdic, S. Belogurov, V. D'Andrea, M. Miloradovic, L. Pertoldi, Bayarto Lubsandorzhiev, Ivano Lippi, A. Wegmann, L. V. Inzhechik, Igor Nemchenok, V. V. Kazalov, C. Wiesinger, M. Shirchenko, Bela Majorovits, Mikael Hult, K. N. Gusev, M. Giordano, Cinzia Sada, A. Lazzaro, D. Borowicz, R. Brugnera, Stefan Schönert, V. V. Kuzminov, Matteo Agostini, Laura Baudis, A.-K. Schütz, A. Zschocke, N. Di Marco, J. Jochum, Manfred Lindner, J. Biernat, O. Selivanenko, B. Schwingenheuer, E. Bellotti, C. Ransom, L. B. Bezrukov, Werner Hofmann, S. V. Zhukov, Thomas Kihm, M. Junker, K. T. Knöpfle, T. Comellato, G. Zuzel, J. Hakenmüller, K. Panas, Luca Stanco, F. Salamida, T. Wester, A.A. Smolnikov, C. Cattadori, Anna Julia Zsigmond, Kai Zuber, and D. Zinatulina

Subjects
Semileptonic decay, Nuclear and High Energy Physics, MAJORONS, Majorana mass, chemistry.chemical_element, Germanium, 01 natural sciences, Nuclear physics, Atomic and Molecular Physics, Double beta decay, 0103 physical sciences, Neutrinoless double beta decay, lepton number violation, Atomic and Molecular Physics, and Optics, Astronomy and Astrophysics, 010306 general physics, Diode, Physics, 010308 nuclear & particles physics, Detector, Beta decay, Semiconductor detector, chemistry, Liquid argon, and Optics
Abstract

The GERmanium Detector Array (GERDA) is a low background experiment at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN designed to search for the rare neutrinoless double beta decay ([Formula: see text]) of [Formula: see text]Ge. In the first phase (Phase I) of the experiment, high purity germanium diodes were operated in a “bare” mode and immersed in liquid argon. The overall background level of [Formula: see text] was a factor of ten better than those of its predecessors. No signal was found and a lower limit was set on the half-life for the [Formula: see text] decay of [Formula: see text]Ge [Formula: see text] yr (90% CL), while the corresponding median sensitivity was [Formula: see text] yr (90% CL). A second phase (Phase II) started at the end of 2015 after a major upgrade. Thanks to the increased detector mass and performance of the enriched germanium diodes and due to the introduction of liquid argon instrumentation techniques, it was possible to reduce the background down to [Formula: see text]. After analyzing 23.2 kg[Formula: see text]⋅[Formula: see text]yr of these new data no signal was seen. Combining these with the data from Phase I a stronger half-life limit of the [Formula: see text]Ge [Formula: see text] decay was obtained: [Formula: see text] yr (90% CL), reaching a sensitivity of [Formula: see text] yr (90% CL). Phase II will continue for the collection of an exposure of 100 kg[Formula: see text]yr. If no signal is found by then the GERDA sensitivity will have reached [Formula: see text] yr for setting a 90% CL. limit. After the end of GERDA Phase II, the flagship experiment for the search of [Formula: see text] decay of [Formula: see text]Ge will be LEGEND. LEGEND experiment is foreseen to deploy up to 1-ton of [Formula: see text]Ge. After ten years of data taking, it will reach a sensitivity beyond 10[Formula: see text] yr, and hence fully cover the inverted hierarchy region.

Published
2018

11. Results on $$\beta \beta $$ β β decay with emission of two neutrinos or Majorons in $$^{76}$$ 76 Ge from GERDA Phase I

Author

M. Shirchenko, I. V. Kirpichnikov, C. A. Ur, E. V. Demidova, N. Barros, Oliver Schulz, V. Egorov, E. Doroshkevich, Alberto Pullia, O. Fedorova, A. V. Veresnikova, A. Chernogorov, K. N. Gusev, Alessandro Bettini, Allen Caldwell, J. Janicskó Csáthy, R. Falkenstein, A. Kirsch, A. Garfagnini, Stefano Riboldi, D. Borowicz, N. Frodyma, S. Belogurov, E. Medinaceli, D. R. Zinatulina, M. Misiaszek, A. Domula, M. Balata, O.I. Kochetov, Stefan Schönert, D. Budjáš, C. Macolino, B. Lehnert, A. Wegmann, I. Zhitnikov, Igor Nemchenok, A. Hegai, P. Grabmayr, Cinzia Sada, Thomas Kihm, C. Schmitt, Matthias Laubenstein, Ivano Lippi, P. Zavarise, V.B. Brudanin, Hardy Simgen, Giovanni Benato, I. R. Barabanov, L. Vanhoefer, S. V. Zhukov, L. B. Bezrukov, M. Junker, V. Wagner, K. Panas, M. M. Wojcik, S. T. Belyaev, V. I. Gurentsov, Bela Majorovits, T. Bode, V. N. Kornoukhov, K. Pelczar, K. von Sturm, K. Freund, Luca Stanco, A. A. Vasenko, B. Schwingenheuer, Mikael Hult, A. M. Gangapshev, N. Becerici-Schmidt, M. Heisel, Laura Baudis, H. Wilsenach, S. Hemmer, M. Stepaniuk, Guillaume Lutter, A. M. Bakalyarov, M. Salathe, Manfred Lindner, H. Y. Liao, Christian Bauer, J. Schreiner, E. Bellotti, K. T. Knöpfle, A. Lubashevskiy, R. Brugnera, V. V. Kuzminov, Bayarto Lubsandorzhiev, Matteo Agostini, J. Jochum, P. Moseev, Luciano Pandola, A. A. Klimenko, T. Wester, N. Rumyantseva, A.A. Smolnikov, G. Zuzel, C. Cattadori, Kai Zuber, V. V. Kazalov, G. Heusser, Werner Hofmann, V. I. Lebedev, D. Palioselitis, M. Allardt, A. Lazzaro, O. Selivanenko, V. D'Andrea, W. Maneschg, E. A. Yanovich, L. V. Inzhechik, A. di Vacri, and Marc Walter

Subjects
Nuclear physics, Physics, Physics and Astronomy (miscellaneous), Phase (waves), Order (ring theory), Beta (velocity), Neutrino, Engineering (miscellaneous), Beta decay, Majoron, Semiconductor detector
Abstract

A search for neutrinoless $\beta\beta$ decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10$^{23}$ yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with $^{76}$Ge. A new result for the half-life of the neutrino-accompanied $\beta\beta$ decay of $^{76}$Ge with significantly reduced uncertainties is also given, resulting in $T^{2\nu}_{1/2} = (1.926 \pm 0.095)\cdot10^{21}$ yr.

Published
2015

12. First results from GERDA Phase II

Author

Manfred Lindner, V. I. Gurentsov, Cinzia Sada, Giovanni Benato, E. Bellotti, V. V. Kazalov, D. Borowicz, Bayarto Lubsandorzhiev, O. Selivanenko, E. Doroshkevich, J. Hakenmüller, Christian Bauer, C. Macolino, J. Janicskó Csáthy, A. Lubashevskiy, L. B. Bezrukov, E. Shevchik, K. T. Knöpfle, R. Mingazheva, R. Brugnera, V. V. Kuzminov, Marcin Wójcik, Matteo Agostini, P. Grabmayr, Werner Hofmann, J. Jochum, L. Stanco, B. Schwingenheuer, Allen Caldwell, O.I. Kochetov, V. Wagner, I. Zhitnikov, A. Wegmann, Alessandro Bettini, B. Lehnert, Igor Nemchenok, A. Kirsch, V.B. Brudanin, G. Zuzel, D. Palioselitis, V. N. Kornoukhov, M. Allardt, Stefano Riboldi, W. Maneschg, Hardy Simgen, E. A. Yanovich, S. T. Belyaev, V. G. Egorov, M. Balata, C. Schmitt, E. Medinaceli, K. Pelczar, K. Panas, A. M. Gangapshev, T. Wester, A.A. Smolnikov, A. Lazzaro, Bela Majorovits, L. V. Inzhechik, P. Moseev, C. Cattadori, Kai Zuber, Guillaume Lutter, A. M. Bakalyarov, L. Vanhoefer, Luciano Pandola, M. Misiaszek, A. A. Klimenko, C. Wiesinger, K. von Sturm, Thomas Kihm, M. Heisel, N. Rumyantseva, M. Shirchenko, Laura Baudis, A. Kish, E. V. Demidova, I. R. Barabanov, A. Domula, F. Salamida, C. Gooch, S. V. Zhukov, A.-K. Schütz, R. Falkenstein, A. Hegai, M. Junker, V. D'Andrea, Jochen Schreiner, N. Di Marco, T. Bode, S. Belogurov, V. I. Lebedev, M. Salathe, Ivano Lippi, D. R. Zinatulina, H. Y. Liao, A. V. Veresnikova, Mikael Hult, A. Chernogorov, S. Hemmer, I. V. Kirpichnikov, M. Miloradovic, B. Schneider, R. Kneißl, K. N. Gusev, Stefan Schönert, Matthias Laubenstein, A. A. Vasenko, N. Frodyma, Oliver Schulz, Alberto Pullia, and A. Garfagnini

Subjects
Nuclear physics, Physics, Semileptonic decay, History, Phase (matter), Nuclear Matrix, Beta Decay, Bolometers, Beta Decay, Bolometers, Nuclear Matrix, Computer Science Applications, Education
Published
2017

13. Active background suppression with the liquid argon scintillation veto of GERDA Phase II

Author

O.I. Kochetov, Oliver Schulz, L. B. Bezrukov, M. Salathe, K. Panas, A. M. Bakalyarov, E. V. Demidova, A. Chernogorov, A. Wegmann, Alberto Pullia, Igor Nemchenok, Christian Bauer, Bela Majorovits, K. Pelczar, S. T. Belyaev, A. Kish, A. Lubashevskiy, D. Palioselitis, D. R. Zinatulina, A. Domula, A. M. Gangapshev, A. Garfagnini, I. R. Barabanov, Guillaume Lutter, C. Gooch, S. V. Zhukov, I. V. Kirpichnikov, B. Lehnert, A.-K. Schütz, Th. Kihm, A. Hegai, Mikael Hult, V. G. Egorov, M. Balata, C. Schmitt, N. Di Marco, M. Allardt, C. Cattadori, L. Stanco, J. Janicskó Csáthy, P. Moseev, L. V. Inzhechik, Luciano Pandola, Ivano Lippi, S. Hemmer, M. Miloradovic, K. N. Gusev, L. Vanhoefer, A. A. Klimenko, V.B. Brudanin, V.N. Kornoukhov, M. Heisel, C. Macolino, Hardy Simgen, R. Falkenstein, Jochen Schreiner, C. Wiesinger, K. T. Knöpfle, N. Rumyantseva, S. Belogurov, R. Brugnera, Manfred Lindner, M. Shirchenko, Matthias Laubenstein, E. Bellotti, E. Doroshkevich, V. V. Kuzminov, B. Schneider, Stefan Schönert, N. Frodyma, M. Junker, Matteo Agostini, V. Wagner, I. Zhitnikov, Laura Baudis, A. V. Veresnikova, O. Selivanenko, Alessandro Bettini, V. I. Lebedev, R. Mingazheva, Cinzia Sada, Marcin Wójcik, P. Grabmayr, B. Schwingenheuer, E. Medinaceli, T. Bode, J. Jochum, H. Y. Liao, Giovanni Benato, V. Kazalov, Stefano Riboldi, M. Misiaszek, V. I. Gurentsov, Bayarto Lubsandorzhiev, E. Shevzik, R. Kneißl, A. Kirsch, W. Maneschg, E. A. Yanovich, V. D'Andrea, A. A. Vasenko, Allen Caldwell, K. von Sturm, Werner Hofmann, D. Borowicz, J. Hakenmüller, T. Wester, A.A. Smolnikov, A. Lazzaro, Kai Zuber, G. Zuzel, and F. Salamida

Subjects
Physics, History, Scintillation, Argon, 010308 nuclear & particles physics, Veto, chemistry.chemical_element, 01 natural sciences, Particle detector, Computer Science Applications, Education, Semiconductor detector, Nuclear physics, chemistry, Impurity, Phase (matter), 0103 physical sciences, Scintillation counter, DETECTORS, 010306 general physics
Published
2017

14. 2νββ decay of 76Ge into excited states with GERDA phase I

Author

null GERDA Collaboration, M Agostini, M Allardt, A M Bakalyarov, M Balata, I Barabanov, N Barros, L Baudis, C Bauer, N Becerici-Schmidt, E Bellotti, S Belogurov, S T Belyaev, G Benato, A Bettini, L Bezrukov, T Bode, D Borowicz, V Brudanin, R Brugnera, D Budjáš, A Caldwell, C Cattadori, A Chernogorov, V D’Andrea, E V Demidova, A di Vacri, A Domula, E Doroshkevich, V Egorov, R Falkenstein, O Fedorova, K Freund, N Frodyma, A Gangapshev, A Garfagnini, C Gooch, P Grabmayr, V Gurentsov, K Gusev, A Hegai, M Heisel, S Hemmer, G Heusser, W Hofmann, M Hult, L V Inzhechik, J Janicskó Csáthy, J Jochum, M Junker, V Kazalov, T Kihm, I V Kirpichnikov, A Kirsch, A Klimenko, K T Knöpfle, O Kochetov, V N Kornoukhov, V V Kuzminov, M Laubenstein, A Lazzaro, V I Lebedev, B Lehnert, H Y Liao, M Lindner, I Lippi, A Lubashevskiy, B Lubsandorzhiev, G Lutter, C Macolino, B Majorovits, W Maneschg, E Medinaceli, Y Mi, M Misiaszek, P Moseev, I Nemchenok, D Palioselitis, K Panas, L Pandola, K Pelczar, A Pullia, S Riboldi, N Rumyantseva, C Sada, M Salathe, C Schmitt, B Schneider, J Schreiner, O Schulz, B Schwingenheuer, S Schönert, A-K Schütz, O Selivanenko, M Shirchenko, H Simgen, A Smolnikov, L Stanco, M Stepaniuk, C A Ur, L Vanhoefer, A A Vasenko, A Veresnikova, K von Sturm, V Wagner, M Walter, A Wegmann, T Wester, H Wilsenach, M Wojcik, E Yanovich, P Zavarise, I Zhitnikov, S V Zhukov, D Zinatulina, K Zuber, and G Zuzel

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, chemistry, Double beta decay, Excited state, chemistry.chemical_element, Beta (velocity), Germanium, Electron, Neutrino, Beta decay, Order of magnitude
Abstract

Two neutrino double beta decay of $^{76}$Ge to excited states of $^{76}$Se has been studied using data from Phase I of the GERDA experiment. An array composed of up to 14 germanium detectors including detectors that have been isotopically enriched in $^{76}$Ge was deployed in liquid argon. The analysis of various possible transitions to excited final states is based on coincidence events between pairs of detectors where a de-excitation $\gamma$ ray is detected in one detector and the two electrons in the other. No signal has been observed and an event counting profile likelihood analysis has been used to determine Frequentist 90\,\% C.L. bounds for three transitions: ${0^+_{\rm g.s.}-2^+_1}$: $T^{2\nu}_{1/2}>$1.6$\cdot10^{23}$ yr, ${0^+_{\rm g.s.}-0^+_1}$: $T^{2\nu}_{1/2}>$3.7$\cdot10^{23}$ yr and ${0^+_{\rm g.s.}-2^+_2}$: $T^{2\nu}_{1/2}>$2.3$\cdot10^{23}$ yr. These bounds are more than two orders of magnitude larger than those reported previously. Bayesian 90\,\% credibility bounds were extracted and used to exclude several models for the ${0^+_{\rm g.s.}-0^+_1}$ transition.

Published
2015

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