Improved measurement of the 2 ν β β half-life of 136 Xe with the EXO-200 detector

J. B. Albert, M. Auger, D. J. Auty, P. S. Barbeau, E. Beauchamp, D. Beck, V. Belov, C. Benitez-Medina, J. Bonatt, M. Breidenbach, T. Brunner, A. Burenkov, G. F. Cao, C. Chambers, J. Chaves, B. Cleveland, S. Cook, A. Craycraft, T. Daniels, M. DanilovS. J. Daugherty, C. G. Davis, J. Davis, R. Devoe, S. Delaquis, A. Dobi, A. Dolgolenko, M. J. Dolinski, M. Dunford, W. Fairbank, J. Farine, W. Feldmeier, P. Fierlinger, D. Franco, D. Fudenberg, G. Giroux, R. Gornea, K. Graham, G. Gratta, C. Hall, K. Hall, C. Hargrove, S. Herrin, M. Hughes, X. S. Jiang, A. Johnson, T. N. Johnson, S. Johnston, A. Karelin, L. J. Kaufman, R. Killick, S. Kravitz, A. Kuchenkov, K. S. Kumar, D. S. Leonard, F. Leonard, C. Licciardi, R. Maclellan, M. G. Marino, B. Mong, M. Montero Díez, D. Moore, R. Nelson, K. O'Sullivan, A. Odian, I. Ostrovskiy, C. Ouellet, A. Piepke, A. Pocar, C. Y. Prescott, A. Rivas, P. C. Rowson, M. P. Rozo, J. J. Russell, A. Sabourov, D. Sinclair, K. Skarpaas, S. Slutsky, V. Stekhanov, V. Strickland, M. Tarka, T. Tolba, D. Tosi, K. Twelker, P. Vogel, J. L. Vuilleumier, A. Waite, J. Walton, T. Walton, M. Weber, L. J. Wen, U. Wichoski, J. Wodin, J. D. Wright, L. Yang, Y. R. Yen, O. Ya Zeldovich, Y. B. Zhao

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Abstract

We report on an improved measurement of the 2νββ half-life of 136Xe performed by EXO-200. The use of a large and homogeneous time-projection chamber allows for the precise estimate of the fiducial mass used for the measurement, resulting in a small systematic uncertainty. We also discuss in detail the data-analysis methods used for double-β decay searches with EXO-200, while emphasizing those directly related to the present measurement. The 136Xe 2νββ half-life is found to be T1/22νββ = 2.165±0.016(stat)±0.059(sys)×1021 yr. This is the most precisely measured half-life of any 2νββ decay to date.

Original languageEnglish
Article number015502
JournalPhysical Review C - Nuclear Physics
Volume89
Issue number1
DOIs
StatePublished - Jan 28 2014
Externally publishedYes

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