Kavli Affiliate: A. C. Davis
| First 5 Authors: S. Al Kharusi, S. Al Kharusi, , ,

| Summary:
EXO-200 was a leading double beta decay experiment consisting of a single-phase, enriched liquid xenon time projection chamber filled with an admixture of 80.672% $^136$Xe and 19.098% $^134$Xe. The detector operated at WIPP between 2010 and 2018 and was designed to search for double beta decay of $^136$Xe. Data was acquired in two phases separated by a period of detector upgrades. We report on the search for $0νββ$ and $2νββ$ decay of $^134$Xe with Phase II EXO-200 data, with median 90% C.L. exclusion sensitivity $T_1/2^0ν geq 3.7times 10^23$ yr and $T_1/2^2ν geq 2.6 times 10^21$ yr, respectively. No statistically significant signal is observed for either decay mode. We set a world-leading lower limit on the half-life of the neutrinoless decay mode of $^134$Xe of $T_1/2^0ν geq 8.7times10^23$ (90% C.L.) and the second strongest constraint on the two-neutrino decay of $T_1/2^2ν geq 2.9times10^21$ (90% C.L.), a 3-fold improvement over the EXO-200 Phase I measurement. New constraints are also set for the $2νββ$ and $0νββ$ decays of $^134$Xe to the lowest excited state of $^134$Ba.
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