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arxiv 1710.07776 v1 pith:JIMMCYO7 submitted 2017-10-21 nucl-ex physics.ins-det

Searching for neutrinoless double beta decay with GERDA

GERDA Collaboration: M. Agostini , A.M. Bakalyarov , M. Balata , I. Barabanov , L. Baudis , C. Bauer , E. Bellotti , S. Belogurov
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A. Bettini L. Bezrukov T. Bode V. Brudanin R. Brugnera A. Caldwell C. Cattadori A. Chernogorov V. D'Andrea E.V. Demidova N. Di Marco A. Domula E. Doroshkevich V. Egorov R. Falkenstein A. Gangapshev A. Garfagnini C. Gooch P. Grabmayr V. Gurentsov K. Gusev J. Hakenm\"uller A. Hegai M. Heisel S. Hemmer R. Hiller W. Hofmann M. Hult L.V. Inzhechik J. Janicsk\'o Cs\'athy J. Jochum M. Junker V. Kazalov Y. Kermaidic T. Kihm I.V. Kirpichnikov A. Kirsch A. Kish A. Klimenko R. Knei{\ss}l K.T. Kn\"opfle O. Kochetov V.N. Kornoukhov V.V. Kuzminov M. Laubenstein A. Lazzaro V.I. Lebedev M. Lindner I. Lippi A. Lubashevskiy B. Lubsandorzhiev G. Lutter C. Macolino B. Majorovits W. Maneschg M. Miloradovic R. Mingazheva M. Misiaszek P. Moseev I. Nemchenok K. Panas L. Pandola A. Pullia C. Ransom S. Riboldi N. Rumyantseva C. Sada F. Salamida C. Schmitt B. Schneider J. Schreiner O. Schulz B. Schwingenheuer S. Sch\"onert A-K. Sch\"utz O. Selivanenko E. Shevchik M. Shirchenko H. Simgen A. Smolnikov L. Stanco L. Vanhoefer A.A. Vasenko A. Veresnikova K. von Sturm V. Wagner A. Wegmann T. Wester C. Wiesinger M. Wojcik E. Yanovich I. Zhitnikov S.V. Zhukov D. Zinatulina A.J. Zsigmond K. Zuber G. Zuzel
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classification nucl-ex physics.ins-det
keywords decayexperimentphasebetadoubleexposuregerdaneutrinoless
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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