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

GERDA collaboration; Agostini, M.; Araujo, G. R.; Bakalyarov, A. M.; Balata, M.; Barabanov, I.; Baudis, L.; Bauer, C.; Bellotti, E.; Belogurov, S.; Bettini, A.; Bezrukov, L.; Biancacci, V.; Borowicz, D.; Bossio, E.; Bothe, V.; Brudanin, V.; Brugnera, R.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; Comellato, T.; D'Andrea, V.; Demidova, E. V.; Di Marco, N.; Doroshkevich, E.; Fischer, F.; Fomina, M.; Gangapshev , A.; Garfagnini, A.; Gooch, C.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hakenmüller, Janina; 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.; Kirpichnikov, I. V.; Klimenko, A.; Kneißl, R.; Knöpfle, K. T.; 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.; Moseev, P.; Müller, Y.; Nemchenok, I.; Panas, K.; Pandola, L.; Pelczar, K.; Pertoldi, L.; Piseri, P.; Pullia, A.; Ransom, C.; Rauscher, L.; 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.; von Sturm, K.; 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.

doi:10.1103/PhysRevLett.125.252502

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

MPS-Authors

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Bothe, V.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons54359

Hakenmüller, Janina
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30605

Hofmann, W.
Prof. Werner Hofmann, Emeriti, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30690

Knöpfle, K. T.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30768

Lindner, M.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30794

Maneschg, W.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons31012

Schreiner, J.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons31027

Schwingenheuer, B.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons31050

Simgen, H.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.125.252502
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2009.06079.pdf
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Citation

GERDA collaboration, Agostini, M., Araujo, G. R., Bakalyarov, A. M., Balata, M., Barabanov, I., et al. (2020). Final Results of GERDA on the Search for Neutrinoless Double-ß Decay. Physical Review Letters, 125(25): 252502. doi:10.1103/PhysRevLett.125.252502.

Cite as: https://hdl.handle.net/21.11116/0000-0007-99CA-9

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.