The next generation neutrinoless double-beta decay experiment nEXO

The nEXO Collaboration is designing a very large detector for neutrinoless double-beta decay of $^{136}$Xe. The nEXO detector is rooted in the current EXO-200 program, which has reached a sensitivity for the half-life of the decay of $1.9\times10^{25}$y with an exposure of 100 kg-y. The baseline nEXO design assumes 5 tonnes of liquid xenon, enriched in the mass 136 isotope, within a time projection chamber. The detector is being designed to reach a half-life sensitivity of $>5\times10^{27}$y, covering the inverted neutrino mass hierarchy, with 5 years of data. We present the nEXO detector design, the current status of R\&D efforts, and the physics case for the experiment.