Multi-site Event Discrimination in the SNO+ Experiment

Large liquid scintillator detectors, such as SNO+, are powerful tools for neutrinoless double beta decay searches due to their exceptional mass scalability, good signal efficiency and low cost. One of the challenges of liquid scintillator experiments is the lack of reliable particle identification for electrons and gammas to allow for radioactive background rejection. In this talk, applying a pulse shape discrimination (PSD) technique in the SNO+ experiement will be discussed, demonstrating the potential to distinguish between single-site (purely electronic) and multi-site (containing gammas) events in a liquid scintillator. The technique is based on timing distribution differences between the two event classes and allows for good statistical separation between them. The impact of the PSD on the projected sensitivity to neutrinoless double beta decay in SNO+ will also be discussed.