Results from the Complete EXO-200 Dataset

EXO-200 was a low-background time-projection chamber employing a stockpile of 200 kg of xenon enriched to 80.6{\%} in isotope 136 and located underground at the WIPP site outside Carlsbad NM. In its first phase of data-taking between September 2011 and February 2014, the experiment made the first observation of two-neutrino double-beta decay of~136Xe, provided the most precise measurement of any two-neutrino half-life to date, and provided one of the most sensitive searches for neutrinoless double-beta decay. While the first phase ended with the 2014 fire and radiation events at WIPP, a second phase of data collection with upgrades including improved energy resolution extended from May 2016 -- December 2018. Analysis of the complete EXO-200 dataset, representing a total $^{\mathrm{136}}$Xe exposure of 234.1 kg-yr, results in a lower limit of 3.5*10$^{\mathrm{25\thinspace }}$yr on the zero-neutrino double-beta decay half-life, with a median sensitivity of 5.0*10$^{\mathrm{25}}$ yr.