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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)
N. Ackerman,* B. Aharmim, M. Auger, D. J. Auty, P. S. Barbeau, K. Barry, L. Bartoszek, E. Beauchamp, V. Belov, C. Benitez-Medina, M. Breidenbach, A. Burenkov, B. Cleveland, R. Conley, E. Conti, J. Cook, S. Cook, A. Coppens, I. Counts, W. Craddock, T. Daniels, M.V. Danilov, C. G. Davis, J. Davis, R. deVoe, Z. Djurcic, A. Dobi, A.G. Dolgolenko, M. J.(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)
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)
We report the observation of two-neutrino double-beta decay in (136)Xe with T(1/2) = 2.11 ± 0.04(stat) ± 0.21(syst) × 10(21) yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for (136)Xe. The observed decay rate provides new input to matrix element calculations and to the search for the more(More)
1 Executive Summary E12-06-104 seeks to perform measurements of the ratio R = σ L /σ T of longitudinal to transverse cross sections in pion electroproduction. The emphasis will be on measurements in the so-called semi-inclusive deep inelastic scattering region, where essentially no information exists on the value of R, with extensions into the exclusive(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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