Calibration of the nEXO search for neutrinoless double beta decay

The nEXO experiment is a proposed next-generation search for the neutrinoless double beta decay (NDBD) of ¹³⁶Xe, which will achieve sensitivity to a NDBD half-life beyond 10²⁸ years. The primary detector will be a 5-tonne, monolithic liquid xenon time projection chamber (TPC), which provides both a high-resolution (sub-1%) energy measurement and mm-scale 3D topological information of each event to enable powerful signal/background discrimination. Validating and optimizing nEXO’s event reconstruction will require careful calibration, spanning the instrumental calibration of individual readout channels all the way to the complete reconstruction of signal-like and background-like calibration events in the liquid xenon TPC. In this talk, I will describe the calibration plan for nEXO. I will include discussion of the various calibration systems (including ongoing R&D and prototyping work) that will enable comprehensive characterization of the nEXO TPC.