Characterizing the Outgassing of Electronegative Impurities in nEXO

Neutrinoless double beta decay (0vbb) is a hypothetical rare nuclear process that could occur if neutrinos are their own antiparticles, a property that might explain why matter dominates antimatter in the universe. nEXO is an upcoming project that will search for this decay in Xenon-136 using a time projection chamber filled with 5 tonnes of liquid xenon. When 0vbb occurs, two neutrons decay into two protons, emitting a pair of electrons that carry the entire decay energy. To effectively separate 0vbb events from background, nEXO requires an accurate reconstruction of the electron pair's energy. However, the outgassing of electronegative impurities via diffusion from detector materials compromises this reconstruction. Our study aims to quantify this diffusion of impurities, compare it across candidate nEXO materials, and develop a model to ensure that nEXO meets its design goals for electronegative impurities.