Search for Majoron-emitting modes of ${}^{136}\mathrm{Xe}$ double beta decay with the complete EXO-200 dataset

Journal Article · Fri Dec 10 00:00:00 EST 2021 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.104.112002· OSTI ID:1835143

Al Kharusi, S.; Anton, G.; Badhrees, I.; Barbeau, P. S.; Beck, D.; Belov, V.; Bhatta, T.; Breidenbach, M.; Brunner, T.; Cao, G. F.; Cen, W. R.; Chambers, C.; Cleveland, B.; Coon, M.; Craycraft, A.; Daniels, T.; Darroch, L.; Daugherty, S. J.; Davis, J.; Delaquis, S. ; Der Mesrobian-Kabakian, A.; DeVoe, R.; Dilling, J.; Dolgolenko, A.; Dolinski, M. J.; Echevers, J.; Fairbank, W.; Fairbank, D.; Farine, J.; Feyzbakhsh, S.; Fierlinger, P.; Fudenberg, D.; Gautam, P.; Gornea, R.; Gratta, G.; Hall, C.; Hansen, E. V.; Hoessl, J.; Hufschmidt, P.; Hughes, M.; Iverson, A.; Jamil, A.; Jessiman, C.; Jewell, M. J.; Johnson, A.; Karelin, A.; Kaufman, L. J.; Koffas, T.; Krücken, R.; Kuchenkov, A.; Kumar, K. S.; Lan, Y.; Larson, A.; Lenardo, B. G.; Leonard, D. S.; Li, G. S.; Li, S.; Li, Z. ; Licciardi, C.; Lin, Y. H.; MacLellan, R.; McElroy, T.; Michel, T.; Mong, B.; Moore, D. C.; Murray, K.; Njoya, O.; Nusair, O.; Odian, A.; Ostrovskiy, I.; Perna, A.; Piepke, A.; Pocar, A.; Retière, F.; Robinson, A. L.; Rowson, P. C.; Ruddell, D.; Runge, J.; Schmidt, S.; Sinclair, D.; Skarpaas, K.; Soma, A. K.; Stekhanov, V.; Tarka, M.; Thibado, S.; Todd, J.; Tolba, T.; Totev, T. I.; Tsang, R.; Veenstra, B.; Veeraraghavan, V.; Vogel, P.; Vuilleumier, J. -L.; Wagenpfeil, M.; Watkins, J.; Weber, M.; Wen, L. J.; Wichoski, U.; Wrede, G.; Wu, S. X.; Xia, Q.; Yahne, D. R.; Yang, L.; Yen, Y. -R.; Zeldovich, O. Ya.; Ziegler, T.

A search for Majoron-emitting modes of the neutrinoless double beta decay of ¹³⁶Xe is performed with the full EXO-200 dataset. This dataset consists of a total ¹³⁶Xe exposure of 234.1 kg · yr, and includes data with detector upgrades that have improved the energy threshold relative to previous searches. A lower limit of $$T_{1/2}^{^{136}Xe}$$ > 4.3 × 10²⁴ yr at 90% C.L. on the half-life of the spectral index n = 1 Majoron decay was obtained, a factor of 3.6 more stringent than the previous limit from EXO-200 and a factor of 1.6 more stringent than the previous best limit from KamLAND-Zen. This limit corresponds to a constraint on the Majoron-neutrino coupling constant of | $$\langle g^{M}_{ee} \rangle$$ | < (0.4–0.9) × 10^–5. The lower threshold and the additional data taken resulted in a factor 8.4 improvement for the n = 7 mode compared to the previous EXO-200 search. This search provides the most stringent limits to date on the Majoron-emitting decays of ¹³⁶Xe with spectral indices n = 1, 2, 3, and 7.

• Research Organization: Univ. of Alabama, Tuscaloosa, AL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Stanford Univ., CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: EXO-200 Collaboration
• Grant/Contract Number: FG02-01ER41166; AC02-76SF00515; AC02-05CH11231; SC0017970
• OSTI ID: 1835143
• Alternate ID(s): OSTI ID: 1841747; OSTI ID: 1865899; OSTI ID: 1903457; OSTI ID: 1925176; OSTI ID: 1992038
• Journal Information: Physical Review D, Journal Name: Physical Review D Vol. 104 Journal Issue: 11; ISSN 2470-0010
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

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