Improved measurement of the 2νββ half-life of ^(136)Xe with the EXO-200 detector

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

Abstract

We report on an improved measurement of the 2νββ half-life of ^(136)Xe performed by EXO-200. The use of a large and homogeneous time-projection chamber allows for the precise estimate of the fiducial mass used for the measurement, resulting in a small systematic uncertainty. We also discuss in detail the data-analysis methods used for double-β decay searches with EXO-200, while emphasizing those directly related to the present measurement. The ^(136)Xe 2νββ half-life is found to be T^(2νββ)_(1/2) = 2.165±0.016(stat)±0.059(sys)×10^(21) yr. This is the most precisely measured half-life of any 2νββ decay to date.

Additional Information

© 2014 American Physical Society. Received 27 June 2013; revised manuscript received 23 November 2013; published 28 January 2014. EXO-200 is supported by the DOE and the NSF in the United States, the NSERC in Canada, the SNF in Switzerland, the NRF in Korea, the RFBR (12-02-12145) in Russia, and the 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 the hospitality and Dr. J. P. Severinghaus of the Scripps Institution of Oceanography for the accurate measurement of the isotopic composition of the EXO-200 enriched xenon.

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Published - PhysRevC.89.015502.pdf

Submitted - 1306.6106v4.pdf

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