Search for Neutrinoless Double-Beta Decay in ¹³⁶Xe with EXO-200

2012/05/31 by M. Auger, D. J. Auty, P. S. Barbeau +75 · 1 citation
Physics and Astronomy · #hep-ex #nucl-ex

paper · pdf · doi:10.1103/physrevlett.109.032505

published as Phys. Rev. Lett. 109, 032505 (2012)

arxiv created 2012/07/20 · arxiv updated 2012/07/24

Abstract

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 x 10^-3 /(kg yr keV) 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 x 10²⁵ yr (90% CL), corresponding to effective Majorana masses of less than 140-380 meV, depending on the matrix element calculation.

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