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Search for two-neutrino double-beta decay of 136Xe to the 0+1excited state of 136Ba with the complete EXO-200 dataset*

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Search for two-neutrino double-beta decay of <sup>136</sup>Xe to the 0<sup>+</sup><sub>1</sub>excited state of <sup>136</sup>Ba with the complete EXO-200 dataset*
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., Jr.; Fairbank, D.; Farine, J.; Feyzbakhsh, S.; Fierlinger, P.; Fu, Y. S.; 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.; Kruecken, R.; Kuchenkov, A.; Kumar, K. S.; Lan, Y.; Larson, A.; Lenardo, B. G.; D. S. Leonard; 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.; Retiere, F.; Robinson, A. L.; Rowson, P. C.; 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.
Publication Date
Chinese Physics C, v.47, no.10
Institute of Physics Publishing
`A new search for two-neutrino double-beta (2 nu ss ss) decay of Xe-136 to the 0(1)(+)excited state of Ba-136 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 2 nu ss ss decay to the state of Ba-136 is yr using a total Xe-136 exposure of 234.1 kg yr. No statistically significant evidence for 2 nu ss ss decay to the 0(1)(+) state is observed, leading to a lower limit of T-1/2(2 nu)(0+ -> 0(1)(+)) > 1.4 x 10(24) yr at 90% confidence level, improved by 70% relative to the current world's best constraint.
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Center for Underground Physics(지하실험 연구단) > 1. Journal Papers (저널논문)
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