Limit on the Radiative Neutrinoless Double Electron Capture of ³⁶Ar from GERDA Phase I

M. Agostini , M. Allardt , A.M. Bakalyarov , M. Balata , I. Barabanov , N. Barros , L. Baudis , C. Bauer

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E. Bellotti S. Belogurov S.T. Belyaev G. Benato A. Bettini L. Bezrukov T. Bode D. Borowicz V. Brudanin R. Brugnera A. Caldwell C. Cattadori A. Chernogorov V. D'Andrea E.V. Demidova A. Di Vacri A. Domula E. Doroshkevich V. Egorov R. Falkenstein O. Fedorova K. Freund N. Frodyma A. Gangapshev A. Garfagnini C. Gooch P. Grabmayr V. Gurentsov K. Gusev J. Hakenm\"uller A. Hegai M. Heisel S. Hemmer G. Heusser W. Hofmann M. Hult L.V. Inzhechik J. Janicsk\'o Cs\'athy J. Jochum M. Junker V. Kazalov 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 B. Lehnert H.Y. Liao M. Lindner I. Lippi A. Lubashevskiy B. Lubsandorzhiev G. Lutter C. Macolino B. Majorovits W. Maneschg E. Medinaceli M. Miloradovic R. Mingazheva M. Misiaszek P. Moseev I. Nemchenok D. Palioselitis K. Panas L. Pandola K. Pelczar A. Pullia S. Riboldi N. Rumyantseva C. Sada F. Salamida M. Salathe C. Schmitt B. Schneider S. Sch\"onert J. Schreiner A.-K. Sch\"utz O. Schulz B. Schwingenheuer O. Selivanenko M. Shirchenko H. Simgen A. Smolnikov L. Stanco M. Stepaniuk L. Vanhoefer A.A. Vasenko A. Veresnikova K. von Sturm V. Wagner M. Walter A. Wegmann T. Wester C. Wiesinger H. Wilsenach M. Wojcik E. Yanovich I. Zhitnikov S.V. Zhukov D. Zinatulina K. Zuber G. Zuzel

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classification ⚛️ nucl-ex hep-ex

keywords capturedoubleelectronneutrinolessgerdagermaniumlimitphase

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Neutrinoless double electron capture is a process that, if detected, would give evidence of lepton number violation and the Majorana nature of neutrinos. A search for neutrinoless double electron capture of $^{36}$Ar has been performed with germanium detectors installed in liquid argon using data from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory of INFN, Italy. No signal was observed and an experimental lower limit on the half-life of the radiative neutrinoless double electron capture of $^{36}$Ar was established: $T_{1/2} > $ 3.6 $\times$ 10$^{21}$ yr at 90 % C.I.

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Limit on the Radiative Neutrinoless Double Electron Capture of ³⁶Ar from GERDA Phase I

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