Improved Search for Invisible Modes of Nucleon Decay in Water with the SNO+ Detector

This paper reports results from a search for single and multinucleon disappearance from the O-16 nucleus in water within the SNOthorn detector using all of the available data. These so-called "invisible" decays do not directly deposit energy within the detector but are instead detected through their subsequent nuclear deexcitation and gamma-ray emission. New limits are given for the partial lifetimes: tau(n -> inv) > 9.0 x 10(29) years, tau(p -> inv) > 9.6 x 10(29) years, tau(nn -> inv) > 1.5 x 10(28) years, tau(np -> inv) > 6.0 x 10(28) years, and tau(np -> inv) > 1.1 x 10(29) years at 90% Bayesian credibility level (with a prior uniform in rate). All but the (nn -> inv) results improve on existing limits by a factor of about 3.