Search for $2\nu\beta\beta$ decay of $^{136}$Xe to the 0$_1^+$ excited
  state of $^{136}$Ba with EXO-200

Collaboration, EXO-200; :, null; Albert, J. B.; Auty, D J; Barbeau, P. S.; Beck, D.; Belov, V.; Breidenbach, M; Brunner, T; Burenkov, A.; Cao, G. F.; Chambers, C.; Chaves, J.; Cleveland, B.; Coon, M.; Craycraft, A.; Daniels, T.; Danilov, M.; Daugherty, S. J.; Davis, J.; Delaquis, S.; Der Mesrobian-Kabakian, A.; DeVoe, R.; Didberidze, T.; Dilling, J.; Dolgolenko, A.; Dolinski, M. J.; Dunford, M.; Fairbank, W.; Farine, J; Feldmeier, W.; Feyzbakhsh, S.; Fierlinger, P.; Fudenberg, D.; Gornea, R.; Graham, K.; Gratta, G; Hall, C.; Hughes, M.; Jewell, M. J.; Johnson, A.; Johnson, T. N.; Johnston, S.; Karelin, A.; Kaufman, L. J.; Killick, R; King, J.; Koffas, T.; Kravitz, S; Krücken, R.; Kuchenkov, A.; Kumar, K. S.; Leonard, D. S.; Licciardi, C.; Lin, Y. H.; Ling, J.; MacLellan, R.; Marino, M. G.; Mong, B.; Moore, D.; Njoya, O; Nelson, R.; Odian, A.; Ostrovskiy, I.; Piepke, A; Pocar, A; Prescott, C. Y.; Retiere, F; Rowson, P. C.; Russell, J. J.; Schubert, A.; Sinclair, D.; Smith, E.; Stekhanov, V.; Tarka, M.; Tolba, T.; Tsang, R.; Twelker, K.; Vogel, P.; Vuilleumier, J. L.; Waite, A.; Walton, J.; Walton, T.; Weber, M.; Wen, L. J.; Wichoski, U.; Winick, T. A.; Wood, J.; Xu, Q. Y.; YANG, L.; Yen, Y. -R.; Zeldovich, O. Ya.

doi:10.1103/PhysRevC.93.035501

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Search for $2\nu\beta\beta$ decay of $^{136}$Xe to the 0$_1^+$ excited state of $^{136}$Ba with EXO-200

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Author(s): EXO-200 Collaboration , : , J. B. Albert , D. J. Auty , P. S. Barbeau , D. Beck , V. Belov , M. Breidenbach , T. Brunner , A. Burenkov , G. F. Cao , C. Chambers , J. Chaves , B. Cleveland , M. Coon , A. Craycraft , T. Daniels , M. Danilov , S. J. Daugherty , J. Davis , S. Delaquis , A. Der Mesrobian-Kabakian , R. DeVoe , T. Didberidze , J. Dilling , A. Dolgolenko , M. J. Dolinski , M. Dunford , W. Fairbank Jr. , J. Farine , W. Feldmeier , S. Feyzbakhsh , P. Fierlinger , D. Fudenberg , R. Gornea , K. Graham , G. Gratta , C. Hall , M. Hughes , M. J. Jewell , A. Johnson , T. N. Johnson , S. Johnston , A. Karelin , L. J. Kaufman , R. Killick , J. King , T. Koffas , S. Kravitz , R. Krücken , A. Kuchenkov , K. S. Kumar , D. S. Leonard , C. Licciardi , Y. H. Lin , J. Ling , R. MacLellan , M. G. Marino , B. Mong , D. Moore , O. Njoya , R. Nelson , A. Odian , I. Ostrovskiy , A. Piepke , A. Pocar , C. Y. Prescott , F. Retière , P. C. Rowson , J. J. Russell , A. Schubert , D. Sinclair , E. Smith , V. Stekhanov , M. Tarka , T. Tolba , R. Tsang , K. Twelker , P. Vogel , J. -L. Vuilleumier , A. Waite , J. Walton , T. Walton , M. Weber , L. J. Wen , U. Wichoski , T. A. Winick , J. Wood , Q. Y. Xu , L. Yang , Y. -R. Yen , O. Ya. Zeldovich

Publication date Created: 2015-11-15

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Abstract

EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}$Xe to the ground state of $^{136}$Ba. We report here on a search for the two-neutrino double-beta decay of $^{136}$Xe to the first $0^+$ excited state, $0^+_1$, of $^{136}$Ba based on a 100 kg$\cdot$yr exposure of $^{136}$Xe. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of $1.7 \times 10^{24}$ yr. We find no statistically significant evidence for the $2\nu\beta\beta$ decay to the excited state resulting in a lower limit of $T^{2\nu}_{1/2}$ ($0^+ \rightarrow 0^+_1$) $> 6.9 \times 10^{23}$ yr at 90% CL. This observed limit is consistent with the estimated half-life of $2.5\times10^{25}$ yr.