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

Al Kharusi S, Anton G, Badhrees I, Barbeau PS, Beck D, Belov V, Bhatta T, Breidenbach M, Brunner T, Cao GF, Cen WR, Chambers C, Cleveland B, Coon M, Craycraft A, Daniels T, Darroch L, Daugherty SJ, Davis J, Delaquis S, Der Mesrobian-Kabakian A, Devoe R, Dilling J, Dolgolenko A, Dolinski MJ, Echevers J, Fairbank W, Fairbank D, Farine J, Feyzbakhsh S, Fierlinger P, Fu YS, Fudenberg D, Gautam P, Gornea R, Gratta G, Hall C, Hansen EV, Hößl J, Hufschmidt P, Hughes M, Iverson A, Jamil A, Jessiman C, Jewell MJ, Johnson A, Karelin A, Kaufman LJ, Koffas T, Krücken R, Kuchenkov A, Kumar KS, Lan Y, Larson A, Lenardo BG, Leonard DS, Li GS, Li S, Li Z, Licciardi C, Lin YH, MacLellan R, McElroy T, Michel T, Mong B, Moore DC, Murray K, Njoya O, Nusair O, Odian A, Ostrovskiy I, Perna A, Piepke A, Pocar A, Retière F, Robinson AL, Rowson PC, Runge J, Schmidt S, Sinclair D, Skarpaas K, Soma AK, Stekhanov V, Tarka M, Thibado S, Todd J, Tolba T, Totev TI, Tsang R, Veenstra B, Veeraraghavan V, Vogel P, Vuilleumier JL, Wagenpfeil M, Watkins J, Weber M, Wen LJ, Wichoski U, Wrede G, Wu SX, Xia Q, Yahne DR, Yang L, Yen YR, Zeldovich OY, Ziegler T (2023)

Publication Language: English

Publication Type: Journal article

Publication year: 2023

Journal

Book Volume: 47

Article Number: 103001

Journal Issue: 10

DOI: 10.1088/1674-1137/aceee3

Abstract

A new search for two-neutrino double-beta (2νββ) decay of ¹³⁶Xe to the 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 events. Signal detection efficiency is increased relative to previous searches by EXO-200 by more than a factor of two. With the addition of the Phase II dataset taken with an upgraded detector, the median 90% confidence level half-life sensitivity of 2νββ decay to the state of ¹³⁶Ba is yr using a total ¹³⁶Xe exposure of 234.1 kg yr. No statistically significant evidence for 2νββ decay to the state is observed, leading to a lower limit of yr at 90% confidence level, improved by 70% relative to the current world's best constraint.

Authors with CRIS profile

Involved external institutions

Triangle Universities Nuclear Laboratory United States (USA) (US) Institute of High Energy Physics (IHEP) / 中国科学院高能物理研究所 China (CN) McGill University Canada (CA) University of Illinois at Urbana-Champaign United States (USA) (US) University of Maryland, College Park (UMD) United States (USA) (US) Colorado State University United States (USA) (US) Institute for Basic Science Korea, Republic of (KR) Laurentian University Canada (CA) State University of New York at Albany (UNY Albany / UAlbany) United States (USA) (US) The University of Alabama United States (USA) (US) Stanford National Accelerator Laboratory (SLAC) United States (USA) (US) University of Massachusetts Amherst (UMass) United States (USA) (US) Drexel University United States (USA) (US) Institute for Theoretical and Experimental Physics (ITEP) /Институт теоретической и экспериментальной физики Russian Federation (RU) Stanford University United States (USA) (US) Indiana University United States (USA) (US) TRIUMF Canada (CA) Yale University United States (USA) (US) University of South Dakota United States (USA) (US) Carleton University Canada (CA) California Institute of Technology (Caltech) United States (USA) (US) University of California, San Diego (UC San Diego, UCSD) United States (USA) (US) Universität Bern Switzerland (CH) Technische Universität München (TUM) Germany (DE) University of North Carolina Wilmington (UNCW) United States (USA) (US)

How to cite

APA:

Al Kharusi, S., Anton, G., Badhrees, I., Barbeau, P.S., Beck, D., Belov, V.,... Ziegler, T. (2023). Search for two-neutrino double-beta decay of 136Xe to the excited state of 136Ba with the complete EXO-200 dataset. Chinese Physics C, 47(10). https://doi.org/10.1088/1674-1137/aceee3

MLA:

Al Kharusi, S., et al. "Search for two-neutrino double-beta decay of 136Xe to the excited state of 136Ba with the complete EXO-200 dataset." Chinese Physics C 47.10 (2023).

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