Abstract
The nEXO experiment is double beta decay study experiment and the successor of a very successful EXO-200 experiment. The main goal is to search for neutrinoless double-beta decay ( \(2\beta 0\nu\) ) mode of \({}^{136}\) Xe isotope. \(2\beta 0\nu\) is a lepton number violating process whose positive observation would be a direct evidence of physics beyond the Standard Model. At the same time, it would indicate that neutrino is a Majorana fermion, a unique property among fundamental particles of the Standard Model, and would allow to measure neutrino mass scale. The nEXO detector is a monolithic cylindrical time projection chamber (TPC) filled with 5 t of liquid xenon enriched to 90 \(\%\) in the isotope \({}^{136}\) Xe and equipped for the detection of both ionization and scintillation signal. The project includes state-of-the-art detector design and careful material screening for radioactivity. nEXO is designed to achieve an energy resolution better than 1 \(\%\) at \(Q_{\beta\beta}\) -value and uses advanced methods of data analysis, including the extraction of its ultimate sensitivity via a multiparameter fit to the dataset using a multitude of event-level information. These factors allow to reach a half-life sensitivity to \(2\beta 0\nu\) exceeding \(10^{28}\) years at the 90 \(\%\) CL. This talk provides an overview of nEXO project as well as a summary of the diverse range of R&D efforts currently underway.
