  The NEXT-100 time projection chamber, currently under construction, will
search for neutrinoless double beta decay (bb0nu) using 100-150 kg of
high-pressure xenon gas enriched in the Xe-136 isotope to ~91%. The detector
possesses two important features for bb0nu searches: very good energy
resolution (better than 1% FWHM at the Q value of Xe-136) and event topological
information for the distinction between signal and background. Furthermore, the
technique can be extrapolated to the ton-scale, thus allowing the full
exploration of the inverted hierarchy of neutrino masses.
