Results on neutrinoless double-β decay of 76Ge from Phase I of the GERDA 
Experiment

Agostini, M.; Allardt, M.; Andreotti, E.; Bakalyarov, A. M.; Balata, M.; Barabanov, I.; Heider Barnabé, M.; Barros, N.; Baudis, L.; Bauer, C.; Becerici-Schmidt, N.; Bellotti, E.; Belogurov, S.; Belyaev, S. T.; Benato, G.; Bettini, A.; Bezrukov, L.; Bode, T.; Brudanin, V.; Brugnera, R.; Budjáš, D.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; Cossavella, F.; Demidova, E. V.; Domula, A.; Egorov, V.; Falkenstein, R.; Ferella, A.; Freund, K.; Frodyma, N.; Gangapshev, A.; Garfagnini, A.; Gotti, C.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Guthikonda, K. K.; Hampel, W.; Hegai, A.; Heisel, Mark; Hemmer, S.; Heusser, G.; Hofmann, Werner; Hult, M.; Inzhechik, L. V.; Ioannucci, L.; Csáthy, J. Janicskó; Jochum, J.; Junker, M.; Kihm, T.; Kirpichnikov, I. V.; Kirsch, A.; Klimenko, A.; Knoepfle, Karl Tasso; Kochetov, O.; Kornoukhov, V. N.; Kuzminov, V. V.; Laubenstein, M.; Lazzaro, A.; Lebedev, V. I.; Lehnert, B.; Liao, H. Y.; Lindner, Manfred; Lippi, I.; Liu, X.; Lubashevskiy, Alexey; Lubsandorzhiev, B.; Lutter, G.; Macolino, C.; Machado, A. A.; Majorovits, B.; Maneschg, W.; Misiaszek, M.; Nemchenok, I.; Nisi, S.; O'Shaughnessy, C.; Pandola, L.; Pelczar, K.; Pessina, G.; Potenza, %F.; Pullia, A.; Riboldi, S.; Rumyantseva, N.; Sada, C.; Salathe , M.; Schmitt, C.; Schreiner, Jochen; Schulz, O.; Schwingenheuer, Bernhard; Schönert, Stefan; Shevchik, E.; Shirchenko, M.; Simgen, H.; Smolnikov, A.; Stanco, L.; Strecker, Herbert; Tarka, M.; Ur, C. A.; Vasenko, A. A.; Volynets, O.; von Sturm, K.; Wagner, V.; Walter, M.; Wegmann, Anne; Wester, T.; Wojcik, M.; Yanovich, E.; Zavarise, P.; Zhitnikov, I.; Zhukov, S. V.; Zinatulina, D.; Zuber, K.; Zuzel, G.

doi:10.1103/PhysRevLett.111.122503

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Results on neutrinoless double-β decay of ⁷⁶Ge from Phase I of the GERDA Experiment

MPS-Authors

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

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Hofmann, Werner
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Knoepfle, Karl Tasso
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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

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Lubashevskiy, Alexey
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, Jochen
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Schwingenheuer, Bernhard
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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

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

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

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Citation

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., et al. (2013). Results on neutrinoless double-β decay of ⁷⁶Ge from Phase I of the GERDA Experiment. Physical Review Letters, 111(12): 122503. doi:10.1103/PhysRevLett.111.122503.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0014-7C43-0

Abstract

Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the Standard Model of particle physics. This Letter reports the results from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope 76Ge. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kgyr. A blind analysis is performed. The background index is about 1.10^{-2} cts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of 76Ge, T_1/2 > 2.1 10^{25} yr (90% C.L.). The combination with the results from the previous experiments with 76Ge yields T_1/2 > 3.0 10^{25} yr (90% C.L.).