/ nucl-ex arXiv:1710.07776

Searching for neutrinoless double beta decay with GERDA

Agostini, M. (Munich, Tech. U., Universe) ; Bakalyarov, A.M. (Kurchatov Inst., Moscow) ; Balata, M. (Gran Sasso) ; Barabanov, I. (Moscow, INR) ; Baudis, L. (Zurich U.) ; Bauer, C. (Heidelberg, Max Planck Inst.) ; Bellotti, E. (INFN, Milan Bicocca) ; Belogurov, S. (Moscow, INR) ; Bettini, A. (INFN, Padua) ; Bezrukov, L. (Moscow, INR) ; Bode, T. (Munich, Tech. U., Universe) ; Brudanin, V. (Dubna, JINR) ; Brugnera, R. (INFN, Padua) ; Caldwell, A. (Munich, Max Planck Inst.) ; Cattadori, C. (INFN, Milan Bicocca) ; Chernogorov, A. (Moscow, ITEP) ; D'Andrea, V. (Gran Sasso) ; Demidova, E.V. (Moscow, ITEP) ; Di Marco, N. (Gran Sasso) ; Domula, A. (Dresden, Tech. U.) ; Doroshkevich, E. (Moscow, INR) ; Egorov, V. (Dubna, JINR) ; Falkenstein, R. (Tubingen U.) ; Gangapshev, A. (Heidelberg, Max Planck Inst.) ; Garfagnini, A. (INFN, Padua) ; Gooch, C. (Munich, Max Planck Inst.) ; Grabmayr, P. (Tubingen U.) ; Gurentsov, V. (Moscow, INR) ; Gusev, K. (Munich, Tech. U., Universe) ; Hakenmüller, J. (Heidelberg, Max Planck Inst.) ; Hegai, A. (Tubingen U.) ; Heisel, M. (Heidelberg, Max Planck Inst.) ; Hemmer, S. (INFN, Padua) ; Hiller, R. (Zurich U.) ; Hofmann, W. (Heidelberg, Max Planck Inst.) ; Hult, M. (Geel, JRC) ; Inzhechik, L.V. (Moscow, INR) ; JanicskóCsáthy, J. (Munich, Tech. U., Universe) ; Jochum, J. (Tubingen U.) ; Junker, M. (Gran Sasso) ; Kazalov, V. (Moscow, INR) ; Kermaidic, Y. (Heidelberg, Max Planck Inst.) ; Kihm, T. (Heidelberg, Max Planck Inst.) ; Kirpichnikov, I.V. (Moscow, ITEP) ; Kirsch, A. (Heidelberg, Max Planck Inst.) ; Kish, A. (Zurich U.) ; Klimenko, A. (Dubna, JINR) ; Kneißl, R. (Munich, Max Planck Inst.) ; Knöpfle, K.T. (Heidelberg, Max Planck Inst.) ; Kochetov, O. (Dubna, JINR) ; Kornoukhov, V.N. (Moscow, INR) ; Kuzminov, V.V. (Moscow, INR) ; Laubenstein, M. (Gran Sasso) ; Lazzaro, A. (Munich, Tech. U., Universe) ; Lebedev, V.I. (Kurchatov Inst., Moscow) ; Lindner, M. (Heidelberg, Max Planck Inst.) ; Lippi, I. (INFN, Padua) ; Lubashevskiy, A. (Dubna, JINR) ; Lubsandorzhiev, B. (Moscow, INR) ; Lutter, G. (Geel, JRC) ; Macolino, C. (Gran Sasso) ; Majorovits, B. (Munich, Max Planck Inst.) ; Maneschg, W. (Heidelberg, Max Planck Inst.) ; Miloradovic, M. (Zurich U.) ; Mingazheva, R. (Zurich U.) ; Misiaszek, M. (Jagiellonian U.) ; Moseev, P. (Moscow, INR) ; Nemchenok, I. (Dubna, JINR) ; Panas, K. (Jagiellonian U.) ; Pandola, L. (INFN, LNS) ; Pullia, A. (Milan U.) ; Ransom, C. (Zurich U.) ; Riboldi, S. (Milan U.) ; Rumyantseva, N. (Dubna, JINR) ; Sada, C. (INFN, Padua) ; Salamida, F. (INFN, Milan Bicocca) ; Schmitt, C. (Tubingen U.) ; Schneider, B. (Dresden, Tech. U.) ; Schreiner, J. (Heidelberg, Max Planck Inst.) ; Schulz, O. (Munich, Max Planck Inst.) ; Schwingenheuer, B. (Heidelberg, Max Planck Inst.) ; Schönert, S. (Munich, Tech. U., Universe) ; Schütz, A-K. (Tubingen U.) ; Selivanenko, O. (Moscow, INR) ; Shevchik, E. (Dubna, JINR) ; Shirchenko, M. (Dubna, JINR) ; Simgen, H. (Heidelberg, Max Planck Inst.) ; Smolnikov, A. (Dubna, JINR) ; Stanco, L. (INFN, Padua) ; Vanhoefer, L. (Munich, Max Planck Inst.) ; Vasenko, A.A. (Moscow, ITEP) ; Veresnikova, A. (Moscow, INR) ; von Sturm, K. (INFN, Padua) ; Wagner, V. (Heidelberg, Max Planck Inst.) ; Wegmann, A. (Heidelberg, Max Planck Inst.) ; Wester, T. (Dresden, Tech. U.) ; Wiesinger, C. (Munich, Tech. U., Universe) ; Wojcik, M. (Jagiellonian U.) ; Yanovich, E. (Moscow, INR) ; Zhitnikov, I. (Dubna, JINR) ; Zhukov, S.V. (Kurchatov Inst., Moscow) ; Zinatulina, D. (Dubna, JINR) ; Zsigmond, A.J. (Munich, Max Planck Inst.) ; Zuber, K. (Dresden, Tech. U.) ; Zuzel, G. (Jagiellonian U.)

Pages: 8

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.

Web-Page: http://inspirehep.net/record/1632043/files/plots_G1707_6_ROILimit.png; http://inspirehep.net/record/1632043/files/plots_G1707_2_Shifts.png; http://inspirehep.net/record/1632043/files/plots_GeomLayout.png; http://inspirehep.net/record/1632043/files/plots_G1707_2_ResCurves.png; http://inspirehep.net/record/1632043/files/arXiv:1710.07776.pdf

Note: 8 pages, to appear in the proceedings of TAUP2017

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