Measurement of the Spectral Shape of the beta-Decay of Xe-137 to the Ground State of Cs-137 in EXO-200 and Comparison with Theory

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, Mesrobian-Kabakian AD, Devoe R, Dilling J, Dolgolenko A, Dolinski MJ, Echevers J, Fairbank W, Fairbank D, Farine J, Feyzbakhsh S, Fierlinger P, Fudenberg D, Gautam P, Gornea R, Gratta G, Hall C, Hansen E, Hößl J, Hufschmidt P, Hughes M, Iverson A, Jamil A, Jessiman C, Jewell MJ, Johnson A, Karelin A, Kaufman LJ, Koffas T, Kostensalo J, Krucken 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, Nakarmi P, Njoya O, Nusair O, Odian A, Ostrovskiy I, Piepke A, Pocar A, Retiere F, Robinson AL, Rowson PC, Ruddell D, Runge J, Schmidt S, Sinclair D, Skarpaas K, Soma AK, Stekhanov V, Suhonen J, Tarka M, Thibado S, Todd J, Tolba T, Totev T, 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 (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Book Volume: 124

Journal Issue: 23

DOI: 10.1103/PhysRevLett.124.232502

Abstract

We report on a comparison between the theoretically predicted and experimentally measured spectra of the first-forbidden nonunique beta-decay transition Xe-137(7/2(-)) -> Cs-137(7/2(+)). The experimental data were acquired by the EXO-200 experiment during a deployment of an AmBe neutron source. The ultralow background environment of EXO-200, together with dedicated source deployment and analysis procedures, allowed for collection of a pure sample of the decays, with an estimated signal to background ratio of more than 99 to 1 in the energy range from 1075 to 4175 keV. In addition to providing a rare and accurate measurement of the first-forbidden nonunique beta-decay shape, this work constitutes a novel test of the calculated electron spectral shapes in the context of the reactor antineutrino anomaly and spectral bump.

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Additional Organisation(s)

Involved external institutions

Stanford National Accelerator Laboratory (SLAC) United States (USA) (US) National Research Centre "Kurchatov Institute" / Hациональный исследовательский центр "Курчатовский Институт" Russian Federation (RU) Stanford University United States (USA) (US) Laurentian University Canada (CA) University of Massachusetts Amherst (UMass) United States (USA) (US) University of Illinois at Urbana-Champaign United States (USA) (US) Drexel University United States (USA) (US) University of North Carolina Wilmington (UNCW) United States (USA) (US) Triumf Canada (CA) McGill University Canada (CA) Carleton University Canada (CA) Duke University United States (USA) (US) Institute of High Energy Physics (IHEP) / 中国科学院高能物理研究所 China (CN) Colorado State University United States (USA) (US) State University of New York at Albany (UNY Albany / UAlbany) United States (USA) (US) University of Alabama in Huntsville (UAH) United States (USA) (US) University of California, San Diego United States (USA) (US) California Institute of Technology (Caltech) United States (USA) (US) University of Jyväskylä / Jyväskylän yliopisto Finland (FI) Institute for Basic Science Korea, Republic of (KR) Yale University United States (USA) (US) University of South Dakota United States (USA) (US) University of Maryland United States (USA) (US) Technische Universität München (TUM) Germany (DE) Universität Bern Switzerland (CH) Indiana University United States (USA) (US)

How to cite

APA:

Al Kharusi, S., Anton, G., Badhrees, I., Barbeau, P.S., Beck, D., Belov, V.,... Ziegler, T. (2020). Measurement of the Spectral Shape of the beta-Decay of Xe-137 to the Ground State of Cs-137 in EXO-200 and Comparison with Theory. Physical Review Letters, 124(23). https://doi.org/10.1103/PhysRevLett.124.232502

MLA:

Al Kharusi, S., et al. "Measurement of the Spectral Shape of the beta-Decay of Xe-137 to the Ground State of Cs-137 in EXO-200 and Comparison with Theory." Physical Review Letters 124.23 (2020).

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