Abstract
The half-life of $^{15}\mathrm{O}$ was measured using the $\ensuremath{\beta}$-Counting Station at the University of Notre Dame's Nuclear Science Laboratory. Our new result, ${t}_{1/2}=122.308(49)$ s, is the most precise determination to date for $^{15}\mathrm{O}$, and improves the world average by a factor of 4, yielding ${t}_{1/2}^{\text{world}}=122.27(6)$ s. This more precise value will be important for future determinations of ${V}_{\text{ud}}$ using superallowed $T=1/2$ mirror transitions.
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