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Many extensions of the standard model of particle physics suggest that neutrinos should be Majorana-type fermions-that is, that neutrinos are their own anti-particles-but this assumption is difficult to confirm. Observation of neutrinoless double-β decay (0νββ), a spontaneous transition that may occur in several candidate nuclei, would verify the Majorana(More)
We report on a search for neutrinoless double-beta decay of 136Xe with EXO-200. No signal is observed for an exposure of 32.5 kg yr, with a background of ∼1.5×10(-3)  kg(-1) yr(-1)  keV(-1) in the ±1σ region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay T(1/2)(0νββ)(136Xe)>1.6×10(25)  yr (90% C.L.),(More)
J. B. Albert,1 M. Auger,2 D. J. Auty,3 P. S. Barbeau,4 E. Beauchamp,5 D. Beck,6 V. Belov,7 C. Benitez-Medina,8 J. Bonatt,9,4 M. Breidenbach,10 T. Brunner,4 A. Burenkov,7 G. F. Cao,11 C. Chambers,8 J. Chaves,4 B. Cleveland,5,* S. Cook,8 A. Craycraft,8 T. Daniels,9 M. Danilov,7 S. J. Daugherty,1 C. G. Davis,12 J. Davis,4 R. DeVoe,4 S. Delaquis,2 A. Dobi,12 A.(More)
J.B. Albert, M. Auger, D.J. Auty, P.S. Barbeau, E. Beauchamp, D. Beck, V. Belov, C. Benitez-Medina, J. Bonatt, 4 M. Breidenbach, T. Brunner, A. Burenkov, G.F. Cao, C. Chambers, J. Chaves, B. Cleveland, a S. Cook, A. Craycraft, T. Daniels, M. Danilov, S.J. Daugherty, C.G. Davis, J. Davis, R. DeVoe, S. Delaquis, A. Dobi, A. Dolgolenko, M.J. Dolinski, M.(More)
J.B. Albert, P.S. Barbeau, D. Beck, V. Belov, M. Breidenbach, T. Brunner, 7 A. Burenkov, G.F. Cao, C. Chambers, B. Cleveland, ∗ M. Coon, A. Craycraft, T. Daniels, M. Danilov, S.J. Daugherty, C.G. Davis, † J. Davis, S. Delaquis, A. Der Mesrobian-Kabakian, R. DeVoe, J.S. Dı́az, T. Didberidze, J. Dilling, A. Dolgolenko, M.J. Dolinski, M. Dunford, W. Fairbank(More)
A successfull application of Geiger-mode multipixel avalanche diodes (GMAPDs) for pulse-shape discrimination in alpha-beta spectrometry using organic liquid scintillator is described in this paper. Efficient discrimination of alpha and beta components in the emission of radioactive isotopes is achieved for alpha energies above 0.3 MeV. The ultra-compact(More)
J. B. Albert, D. J. Auty, P. S. Barbeau, E. Beauchamp, D. Beck, V. Belov, C. Benitez-Medina, 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, C. G. Davis, J. Davis, R. DeVoe, S. Delaquis, T. Didberidze, A. Dolgolenko, M. J. Dolinski, M. Dunford, W.(More)
J. B. Albert,1 D. J. Auty,2,* P. S. Barbeau,3 D. Beck,4 V. Belov,5 M. Breidenbach,6 T. Brunner,7,8 A. Burenkov,5 G. F. Cao,9 C. Chambers,10 J. Chaves,11 B. Cleveland,12,† M. Coon,4 A. Craycraft,10 T. Daniels,6 M. Danilov,5 S. J. Daugherty,1 J. Davis,6 S. Delaquis,13 A. Der Mesrobian-Kabakian,12 R. DeVoe,11 T. Didberidze,2 J. Dilling,8 A. Dolgolenko,5 M. J.(More)
We describe a system to transport and identify barium ions produced in liquid xenon, as part of R&D towards the second phase of a double beta decay experiment, nEXO. The goal is to identify the Ba ion resulting from an extremely rare nuclear decay of the isotope (136)Xe, hence providing a confirmation of the occurrence of the decay. This is achieved through(More)
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