nEXO - Neutrinoless double beta decay experiment

The nEXO collaboration is currently designing a 5-ton liquid-xenon time projection chamber to search for neutrinoless double beta decay. An observation of this decay would show that neutrinos are Majorana particles and that lepton number is not always conserved. Here we discuss some of the initial design choices for the nEXO detector, which will follow the currently operating ∼ 175kg EXO-200 experiment. Initial simulations will be presented that show that the nEXO detector will have very low backgrounds and that the multi-parameter approach tested in EXO- 200 will be even more powerful in the larger nEXO detector