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Search for two-neutrino double-beta decay of^(136)Xe to the 0^(+)_(1)excited state of 136Ba with the complete EXO-200 dataset

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Chinese Physics C 2023年第10期47卷 1-9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.DeVoe 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.MacLellan T.McElroy 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 无 Physics Department McGill UniversityMontrealQuebec H3A 2T8Canada Erlangen Centre for Astroparticle Physics(ECAP) Friedrich-Alexander-University Erlangen-NürnbergErlangen 91058Germany Physics Department Carleton UniversityOttawaOntario K1S 5B6Canada Department of Physics Duke Universityand Triangle Universities Nuclear Laboratory(TUNL)DurhamNorth Carolina 27708USA Physics Department University of IllinoisUrbana-ChampaignIllinois 61801USA Institute for Theoretical and Experimental Physics named by A.I.Alikhanov of national research Centre“Kurchatov Institute” Moscow 117218Russia Department of Physics University of South DakotaVermillionSouth Dakota 57069USA SLAC national Accelerator Laboratory Menlo ParkCalifornia 94025USA TrIUMF VancouverBritish Columbia V6T 2A3Canada Institute of High Energy Physics Beijing 100049China Department of Physics Laurentian UniversitySudburyOntario P3E 2C6Canada Physics Department Colorado State UniversityFort CollinsColorado 80523USA Department of Physics and Physical Oceanography University of North Carolina at WilmingtonWilmingtonNC 28403USA Physics Department and CEEM Indiana UniversityBloomingtonIndiana 47405USA Physics Department Stanford UniversityStanfordCalifornia 94305USA Department of Physics Drexel UniversityPhiladelphiaPennsylvania 19104USA Amherst Center for Fundamental Interactions and Physics Department University of MassachusettsAmherstMA 01003USA Technische Universität München Physikdepartment and Excellence Cluster UniverseGarching 80805Germany Physics Department University of MarylandCollege ParkMaryland 20742USA Department of Physics and Astronomy University of AlabamaTuscaloosaAlabama 35487USA Wright Laboratory Department of PhysicsYale UniversityNew HavenConnecticut 06511USA IBS Center for Underground Physics Daejeon 34126Korea Department of Physics and Astronomy Stony Brook UniversitySUNYStony BrookNew York 11794USA Kellogg Lab CaltechPasadenaCalifornia 91125USA LHEP Albert Einstein CenterUniversi

A new search for two-neutrino double-beta(2νββ)decay of^(136)Xe to the 0+1 excited state of 136Ba 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 2νββdecay to the 0+1 state of 136Ba is 2.9×10^(24)yr using a total^(136)Xe exposure of 234.1 kg *** statistically significant evidence for 2νββdecay to the 0^(+)_(1)state is observed,leading to a lower limit of T2ν1/2(0^(+)→0^(+)_(1))>1.4×10^(24)yr 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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