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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;

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

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

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

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

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

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

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

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

Fulltext (public)

2009.06079.pdf
(Preprint), 423KB

Supplementary Material (public)
There is no public supplementary material available
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: http://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.