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

J. B. Albert et al. (EXO Collaboration)
Phys. Rev. C 89, 015502 – Published 28 January 2014

Abstract

We report on an improved measurement of the 2νββ half-life of 136Xe 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 136Xe 2νββ half-life is found to be T1/22νββ = 2.165±0.016(stat)±0.059(sys)×1021 yr. This is the most precisely measured half-life of any 2νββ decay to date.

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  • Received 27 June 2013
  • Revised 23 November 2013

DOI:https://doi.org/10.1103/PhysRevC.89.015502

©2014 American Physical Society

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Vol. 89, Iss. 1 — January 2014

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