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Search for two-neutrino double-beta decay of 136Xe to the 01+excited state of136Ba with the complete EXO-200 dataset

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Chinese Physics C 2023年第10期47卷 5-13页

作者： S.Al Kharusi G.Anton I.Badhrees P.S.Barbeau D.Beck V.Belov T.Bhatta M.Breidenbach T.Brunner G.F.Cao W.R.Cen C.Chambers B.Cleveland M.Coon A.Craycraft T.Daniels L.Darroch S.J.Daugherty J.Davis S.Delaquis A.Der Mesrobian-Kabakian R.De Voe J.Dilling A.Dolgolenko M.J.Dolinski J.Echevers W.Fairbank Jr. D.Fairbank J.Farine S.Feyzbakhsh P.Fierlinger Y.S.Fu D.Fudenberg P.Gautam R.Gornea G.Gratta C.Hall E.V.Hansen J.Hoessl P.Hufschmidt M.Hughes A.Iverson A.jamil C.Jessiman M.J.Jewell A.Johnson A.Karelin L.J.Kaufman T.Koffas R.Krücken A.Kuchenkov K.S.Kumar Y.Lan A.Larson B.G.Lenardo D.S.Leonard G.S.Li S.Li Z.Li C.Licciardi Y.H.Lin R.Mac Lellan T.Mc Elroy T.Michel B.Mong D.C.Moore K.Murray O.Njoya O.Nusair A.Odian I.Ostrovskiy A.Perna A.Piepke A.Pocar F.Retière A.L.Robinson P.C.Rowson J.Runge S.Schmidt D.Sinclair K.Skarpaas A.K.Soma V.Stekhanov M.Tarka S.Thibado J.Todd T.Tolba T.I.Totev R.Tsang B.Veenstra V.Veeraraghavan P.Vogel J.-L.Vuilleumier M.Wagenpfeil J.Watkins M.Weber L.J.Wen U.Wichoski G.Wrede S.X.Wu Q.Xia D.R.Yahne L.Yang Y.-R.Yen O.Ya.Zeldovich T.Ziegler EXO-200 Collaboration Physics Department McGill University Erlangen Centre for Astroparticle Physics (ECAP) Friedrich-Alexander-University Erlangen-Nürnberg Physics Department Carleton University King Abdulaziz City for Science and Technology Department of Physics Duke University and Triangle Universities Nuclear Laboratory (TUNL) Physics Department University of Illinois Institute for Theoretical and Experimental Physics named by A.I.Alikhanov of National Research Centre “Kurchatov Institute” a division of National Research Center “Kurchatov Institute” Department of Physics University of South Dakota Department of Physics and Astronomy University of Kentucky SLAC National Accelerator Laboratory TRIUMF Institute of High Energy Physics Witmem Technology Co. Ltd. Department of Physics Laurentian University Also at SNOLAB Physics Department Colorado State University Department of Physics and Physical Oceanography University of North Carolina at Wilmington Physics Department and CEEM Indiana University Carleton University Commissariat àl’Energie Atomique et auxénergies alternatives Physics Department Stanford University Department of Physics Drexel University University of California Amherst Center for Fundamental Interactions and Physics Department University of Massachusetts Technische Universit?t München Physikdepartment and Excellence Cluster Universe Qventus Department of Physics University of Virginia Physics Department University of Maryland Department of Physics at the University of California Department of Physics and Astronomy University of Alabama Wright Laboratory Department of Physics Yale University Department of Physics Princeton University IBS Center for Underground Physics Physics Department University of California SNOLAB Department of Physics and Astronomy Stony Brook University SUNY SCIPP University of California Institute for Experimental Physics Hamburg University Department of Physics and Astronomy Iowa State University Kellogg Lab Caltech LHEP Albert Einstein Center University of Ber

A new search for two-neutrino double-beta(2vββ) decay of136Xe to the 01+excited state of136Ba is performed with the full EXO-200 dataset.A deep learning-based convolutional neural network is used to discriminate signal from background *** detection efficiency is increased relative to previous searches by EXO-200 by more than a factor of *** the addition of the Phase Ⅱ dataset taken with an upgraded detector,the median 90%confidence level half-life sensitivity of 2vββ decay to the 01+state of136Ba is 2.9 × 1024yr using a total136Xe exposure of 234.1 kg *** statistically significant evidence for 2vββ decay to the 01+state is observed,leading to a lower limit of T1/22v(0+→01+)>1.4×1024yr at 90% confidence level,improved by 70% relative to the current world’s best constraint.

关键词： EXO-200 experiment neutrinoless double beta decay excited state

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