Controlling and Measuring Radon ingress in a Tonne Scale Double Beta Decay Experiment

by Nasim Fatemighomi (SNOLAB)

Friday Sep 19, 2025, 9:30 AM → 10:30 AM Canada/Eastern

Surface Facility/1-121 - Fraser Duncan Auditorium (SNOLAB)

The discovery of neutrinoless double beta decay would answer one of the most profound questions in particle physics: why does the Universe contain more matter than antimatter? Achieving this goal requires an extraordinary level of control over radioactive backgrounds, which can obscure or mimic the extremely rare signals being sought. Among these, the decay products of radon-222 present one of the most persistent and challenging sources of background. In this talk, I will present a range of techniques and methods I have developed and applied to characterize and suppress radon backgrounds in the SNO+ experiment. I will also highlight ongoing research efforts at SNOLAB aimed at establishing ultra-low-radon systems—efforts that are crucial for enabling the next generation of rare-event searches.