Search For Neutrinoless Double-Beta Decay In Xe-136 With Exo-200

M Auger,D J Auty,P S Barbeau,Elspeth M Beauchamp,V A Belov,C Benitezmedina,M Breidenbach,Thomas A Brunner,A A Burenkov,B T Cleveland,Stephen C Cook,T V Daniels,M Danilov,C G Davis, S Delaquis,R Devoe,A Dobi,M J Dolinski,A G Dolgolenko,M Dunford,W M Fairbank,J Farine,W Feldmeier,P Fierlinger,D T Franco,G Giroux, R Gornea,K Graham,G Gratta,C Hall, K L Hall,C K Hargrove,S Herrin,Michael S Hughes,Andrew M Johnson, T N Johnson,A Karelin,L J Kaufman,A Kuchenkov,K S Kumar,D S Leonard,F Leonard, Douglas M Mackay,R Maclellan,M G Marino,B Mong,M Montero Diez,A Muller,R Neilson,R Nelson,A Odian,I Ostrovskiy,K Osullivan, C Ouellet,A Piepke,A Pocar,C Prescott,K Pushkin,P C Rowson, J J Russell, A Sabourov,David A Sinclair,S Slutsky,V N Stekhanov,T Tolba,D Tosi, K Twelker,P Vogel,J L Vuilleumier,A P Waite,T Walton,M Weber, U Wichoski, J Wodin,John D Wright,Lu Yang,Y R Yen, O Zeldovich

PHYSICAL REVIEW LETTERS（2012）

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摘要

We report on a search for neutrinoless double-beta decay of Xe-136 with EXO-200. No signal is observed for an exposure of 32.5 kg yr, with a background of similar to 1.5 x 10(-3) kg(-1) yr(-1) keV(-1) in the +/- 1 sigma region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay T-1/2(0 nu beta beta) (Xe-136) > 1.6 x 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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关键词

region of interest,neutrons,atomic physics,physics

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