Search for neutrinoless double-beta decay in 136Xe with EXO-200.
Auger M,Auty D J,Barbeau P S,Beauchamp E,Belov V,Benitez-Medina C,Breidenbach M,Brunner T,Burenkov A,Cleveland B,Cook S,Daniels T,Danilov M,Davis C G,Delaquis S,deVoe R,Dobi A,Dolinski M J,Dolgolenko A,Dunford M,Fairbank W,Farine J,Feldmeier W,Fierlinger P,Franco D,Giroux G,Gornea R,Graham K,Gratta G,Hall C,Hall K,Hargrove C,Herrin S,Hughes M,Johnson A,Johnson T N,Karelin A,Kaufman L J,Kuchenkov A,Kumar K S,Leonard D S,Leonard F,Mackay D,MacLellan R,Marino M,Mong B,Montero Díez M,Müller A R,Neilson R,Nelson R,Odian A,Ostrovskiy I,O'Sullivan K,Ouellet C,Piepke A,Pocar A,Prescott C Y,Pushkin K,Rowson P C,Russell J J,Sabourov A,Sinclair D,Slutsky S,Stekhanov V,Tolba T,Tosi D,Twelker K,Vogel P,Vuilleumier J-L,Waite A,Walton T,Weber M,Wichoski U,Wodin J,Wright J D,Yang L,Yen Y-R,Zeldovich O Ya,Null Null
Physical review letters（2012）
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摘要
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.), corresponding to effective Majorana masses of less than 140-380 meV, depending on the matrix element calculation.
