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Search for Neutrinoless Double-Beta Decay in ^{136}Xe with EXO-200 |
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| Authors: | M Auger D J Auty P S Barbeau E Beauchamp V Belov C Benitez-Medina M Breidenbach T Brunner A Burenkov B Cleveland S Cook T Daniels M Danilov C G Davis S Delaquis R Devoe A Dobi M J Dolinski A Dolgolenko M Dunford W Fairbank J Farine W Feldmeier P Fierlinger D Franco G Giroux R Gornea K Graham G Gratta C Hall K Hall C Hargrove S Herrin M Hughes A Johnson T N Johnson A Karelin L J Kaufman A Kuchenkov K S Kumar D S Leonard F Leonard D Mackay R Maclellan M Marino B Mong M Montero Díez A R Müller R Neilson R Nelson A Odian I Ostrovskiy K O'Sullivan C Ouellet A Piepke A Pocar C Y Prescott K Pushkin |
| Institution: | LHEP, Albert Einstein Center, University of Bern, Bern, Switzerland. |
| Abstract: | We report on a search for neutrinoless double-beta decay of ^{136}Xe 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}(^{136}Xe)>1.6×10^{25} yr (90% C.L.), corresponding to effective Majorana masses of less than 140-380?meV, depending on the matrix element calculation. |
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