Search for 2 nu beta beta decay of Xe-136 to the 0(1)(+) excited state of Ba-136 with the EXO-200 liquid xenon detector

Publication Type
Journal Article
Year of Publication
2016
Authors
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.
Mesrobian-Kabakian, A. D.
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.
Krucken, 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. Y.
Collaboration, E. X. O.
Name of Publication
Physical Review C
Volume
93
Pagination
9
Issue
3
Date Published
Mar
Type of Article
Article
Short Title
Search for 2 nu beta beta decay of Xe-136 to the 0(1)(+) excited state of Ba-136 with the EXO-200 liquid xenon detector
Accession Number
WOS:000371740600008
ISBN Number
2469-9985
Keywords
double-beta decay, mo-100, Physics, ru-100
Abstract

EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless pp decay of Xe-136 to the ground state of Ba-136. We report here on a search for the two -neutrino pp decay of Xe-136 to the first 0+ excited state, 0(1)(+), of Ba-136 based on a 100 kg yr exposure of Xe-136. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7 x 10(24) yr. We find no statistically significant evidence for the 20P decay to the excited state resulting in a lower limit of Ti-1/2(7 nu) (0(+) -> 0(1)(+)) > 6.9 x10(23) yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5 x 10(25) yr.