  The next-generation Enriched Xenon Observatory (nEXO) is a proposed
experiment to search for neutrinoless double beta ($0\nu\beta\beta$) decay in
$^{136}$Xe with a target half-life sensitivity of approximately $10^{28}$ years
using $5\times10^3$ kg of isotopically enriched liquid-xenon in a time
projection chamber. This improvement of two orders of magnitude in sensitivity
over current limits is obtained by a significant increase of the $^{136}$Xe
mass, the monolithic and homogeneous configuration of the active medium, and
the multi-parameter measurements of the interactions enabled by the time
projection chamber. The detector concept and anticipated performance are
presented based upon demonstrated realizable background rates.
