Observation of Two-Neutrino Double-Beta Decay in [superscript 136]Xe with the EXO-200 Detector

Ackerman, N.; Aharmim, B.; Auger, M.; Auty, D.; Barbeau, P.; Barry, K.; Bartoszek, L.; Beauchamp, E.; Belov, V.; Benitez-Medina, C.; Breidenbach, M.; Burenkov, A.; Cleveland, B.; Conley, R.; Conti, E.; Cook, J.; Cook, S.; Coppens, A.; Counts, I.; Craddock, W.; Daniels, T.; Danilov, M.; Davis, C.; Davis, J.; deVoe, R.; Djurcic, Z.; Dobi, A.; Dolgolenko, A.; Dolinski, M.; Donato, K.; Dunford, M.; Fairbank, W.; Farine, J.; Fierlinger, P.; Franco, D.; Freytag, D.; Giroux, G.; Gornea, R.; Graham, K.; Gratta, G.; Green, M.; Hägemann, C.; Hall, C.; Hall, K.; Haller, G.; Hargrove, C.; Herbst, R.; Herrin, S.; Hodgson, J.; Hughes, M.; Johnson, A.; Karelin, A.; Kaufman, L.; Koffas, T.; Kuchenkov, A.; Kumar, A.; Kumar, K.; Leonard, D.; Leonard, F.; LePort, F.; Mackay, D.; MacLellan, R.; Marino, M.; Martin, Y.; Mong, B.; Montero Díez, M.; Morgan, P.; Müller, A.; Neilson, R.; Nelson, R.; Odian, A.; O’Sullivan, K.; Ouellet, C.; Piepke, A.; Pocar, A.; Prescott, C.; Pushkin, K.; Rivas, A.; Rollin, E.; Rowson, P.; Russell, J.; Sabourov, A.; Sinclair, D.; Skarpaas, K.; Slutsky, S.; Stekhanov, V.; Strickland, V.; Swift, M.; Tosi, D.; Twelker, K.; Vogel, P.; Vuilleumier, J.-L.; Vuilleumier, J.-M.; Waite, A.; Waldman, S.; Walton, T.; Wamba, K.; Weber, M.; Wichoski, U.; Wodin, J.; Wright, J.; Yang, L.; Yen, Y.-R.; Zeldovich, O.

Author(s)

Waldman, Samuel J.

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Alternative title

Observation of Two-Neutrino Double-Beta Decay in 136Xe with the EXO-200 Detector

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Abstract

We report the observation of two-neutrino double-beta decay in [superscript 136]Xe with T[subscript 1/2]=2.11±0.04(stat)±0.21(syst)×10[superscript 21] yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for [superscript 136]Xe. The observed decay rate provides new input to matrix element calculations and to the search for the more interesting neutrinoless double-beta decay, the most sensitive probe for the existence of Majorana particles and the measurement of the neutrino mass scale.

Date issued

2011-11

URI

http://hdl.handle.net/1721.1/70884

Department

Massachusetts Institute of Technology. Department of Physics

Journal

Physical Review Letters

Publisher

American Physical Society

Citation

Version: Final published version

ISSN

0031-9007

1079-7114

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