Developing an Outgassing Model for Candidate Detector Materials in nEXO

Neutrinoless double beta decay is a hypothesized nuclear process that would confirm the Majorana nature of neutrinos. nEXO is an upcoming search for this decay in Xenon-136 using a high voltage time projection chamber (TPC) filled with 5 tonnes of isotopically enriched liquid xenon (LXe). nEXO reconstructs energy deposits through measurements of ionization electrons and scintillation photons produced by such decays within the TPC. However, the outgassing of electronegative impurities via diffusion from detector materials into the LXe bulk compromises the measurement of ionization electrons. In our study, we develop an outgassing model that quantifies this diffusion of impurities from candidate materials to qualify materials for use in the upcoming nEXO experiment.