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20 April 2024

» arxiv » 2002.0108

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Measurement of the Spectral Shape of the beta-decay of 137Xe to the Ground State of 137Cs in EXO-200 and Comparison with Theory
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 ; 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 ; J. Kostensalo ; 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 ; P. Nakarmi ; O. Njoya ; O. Nusair ; A. Odian ; I. Ostrovskiy ; A. Piepke ; A. Pocar ; F. Retière ; A.L. Robinson ; P.C. Rowson ; D. Ruddell ; J. Runge ; S. Schmidt ; D. Sinclair ; K. Skarpaas ; A.K. Soma ; V. Stekhanov ; J. Suhonen ; 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 ;
Date:	1 Feb 2020
Abstract:	We report on a comparison between the theoretically predicted and experimentally measured spectra of the first-forbidden non-unique $eta$-decay transition $^{137} extrm{Xe}(7/2^-) o,^{137} extrm{Cs}(7/2^+)$. The experimental data were acquired by the EXO-200 experiment during a deployment of an AmBe neutron source. The ultra-low 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 non-unique $eta$-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.
Source:	arXiv, 2002.0108
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