Search for Majoron-emitting modes of double-beta decay of ^(136)Xe with EXO-200

Creators: Albert, J. B.; Vogel, P.; EXO 200 Collaboration

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Abstract

EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of ^(136)Xe. Here, we report on a search for various Majoron-emitting modes based on 100 kg yr exposure of ^(136)Xe. A lower limit of T^(136)Xe_(1/2) > 1.2 × 10^(24) yr at 90% C.L. on the half-life of the spectral index=1 Majoron decay was obtained, corresponding to a constraint on the Majoron-neutrino coupling constant of |⟨g^(M)_(ee)⟩| < (0.8–1.7) × 10^(−5).

Additional Information

© 2014 American Physical Society. Published 10 November 2014; received 24 September 2014. EXO-200 is supported by DOE and NSF in the United States, NSERC in Canada, SNF in Switzerland, NRF in Korea, RFBR-14-22-03028 in Russia, and DFG Cluster of Excellence "Universe" in Germany. EXO-200 data analysis and simulation uses resources of the National Energy Research Scientific Computing Center (NERSC), which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02- 05CH11231. The collaboration gratefully acknowledges the WIPP for their hospitality.

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Published - PhysRevD.90.092004.pdf

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