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

Al Kharusi, S. and Anton, G. and Badhrees, I. and Barbeau, P. S. and Beck, D. and Belov, V. and Bhatta, T. and Breidenbach, M. and Brunner, T. and Cao, G. F. and Cen, W. R. and Chambers, C. and Cleveland, B. and Coon, M. and Craycraft, A. and Daniels, T. and Darroch, L. and Daugherty, S. J. and Davis, J. and Delaquis, S. and Der Mesrobian-Kabakian, A. and DeVoe, R. and Dilling, J. and Dolgolenko, A. and Dolinski, M. J. and Echevers, J. and Fairbank, W. and Fairbank, D. and Farine, J. and Feyzbakhsh, S. and Fierlinger, P. and Fudenberg, D. and Gautam, P. and Gornea, R. and Gratta, G. and Hall, C. and Hansen, E. V. and Hoessl, J. and Hufschmidt, P. and Hughes, M. and Iverson, A. and Jamil, A. and Jessiman, C. and Jewell, M. J. and Johnson, A. and Karelin, A. and Kaufman, L. J. and Koffas, T. and Kostensalo, J. and Krücken, R. and Kuchenkov, A. and Kumar, K. S. and Lan, Y. and Larson, A. and Lenardo, B. G. and Leonard, D. S. and Li, G. S. and Li, S. and Li, Z. and Licciardi, C. and Lin, Y. H. and MacLellan, R. and McElroy, T. and Michel, T. and Mong, B. and Moore, D. C. and Murray, K. and Nakarmi, P. and Njoya, O. and Nusair, O. and Odian, A. and Ostrovskiy, I. and Piepke, A. and Pocar, A. and Retière, F. and Robinson, A. L. and Rowson, P. C. and Ruddell, D. and Runge, J. and Schmidt, S. and Sinclair, D. and Skarpaas, K. and Soma, A. K. and Stekhanov, V. and Suhonen, J. and Tarka, M. and Thibado, S. and Todd, J. and Tolba, T. and Totev, T. I. and Tsang, R. and Veenstra, B. and Veeraraghavan, V. and Vogel, P. and Vuilleumier, J.-L. and Wagenpfeil, M. and Watkins, J. and Weber, M. and Wen, L. J. and Wichoski, U. and Wrede, G. and Wu, S. X. and Xia, Q. and Yahne, D. R. and Yang, L. and Yen, Y.-R. and Zeldovich, O. Ya. and Ziegler, T. (2020) Measurement of the Spectral Shape of the β-Decay of ¹³⁷Xe to the Ground State of ¹³⁷Cs in EXO-200 and Comparison with Theory. Physical Review Letters, 124 (23). Art. No. 232502. ISSN 0031-9007.

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We report on a comparison between the theoretically predicted and experimentally measured spectra of the first-forbidden nonunique β-decay transition ¹³⁷Xe(7/2⁻)→¹³⁷Cs(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 β-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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Ostrovskiy, I.0000-0003-4939-0225
Vogel, P.0000-0003-0587-5466
Alternate Title:Measurement of the Spectral Shape of the beta-decay of 137Xe to the Ground State of 137Cs in EXO-200 and Comparison with Theory
Additional Information:© 2020 American Physical Society. Received 3 February 2020; revised manuscript received 17 April 2020; accepted 7 May 2020; published 12 June 2020. EXO-200 is supported by DOE and NSF in the United States, NSERC in Canada, IBS in Korea, RFBR (18-02-00550) in Russia, DFG in Germany, and CAS and ISTCP in China. EXO-200 data analysis and simulation uses resources of the National Energy Research Scientific Computing Center (NERSC). This work has been partially supported by the Academy of Finland under the Academy Project No. 318043. J. K. acknowledges the financial support from the Jenny and Antti Wihuri Foundation. We gratefully acknowledge the KARMEN collaboration for supplying the cosmic ray veto detectors, and the WIPP for their hospitality.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Institute for Basic Science (Korea)UNSPECIFIED
Russian Foundation for Basic Research18-02-00550
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Chinese Academy of SciencesUNSPECIFIED
International Science and Technology Cooperation Project (ISTCP)UNSPECIFIED
Academy of Finland318043
Jenny and Antti Wihuri FoundationUNSPECIFIED
Issue or Number:23
Record Number:CaltechAUTHORS:20200612-150950688
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103902
Deposited By: Tony Diaz
Deposited On:12 Jun 2020 22:23
Last Modified:12 Jun 2020 22:23

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