Search for Neutrinoless Double-Beta Decay in Xe136 with EXO-200
Abstract
We report on a search for neutrinoless double-beta decay of Xe136 with EXO-200. No signal is observed for an exposure of 32.5 kg yr, with a background of ∼1.5×10-3kg-1yr-1keV-1 in the ±1σ region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay T1/20νββ(Xe136)>1.6×1025yr (90% C.L.), corresponding to effective Majorana masses of less than 140-380 meV, depending on the matrix element calculation.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 2012
- DOI:
- arXiv:
- arXiv:1205.5608
- Bibcode:
- 2012PhRvL.109c2505A
- Keywords:
-
- 23.40.-s;
- 14.60.Pq;
- 21.10.Tg;
- 27.60.+j;
- Beta decay;
- double beta decay;
- electron and muon capture;
- Neutrino mass and mixing;
- Lifetimes;
- 90<
- =A<
- =149;
- High Energy Physics - Experiment;
- Nuclear Experiment
- E-Print:
- Phys. Rev. Lett. 109, 032505 (2012)