The constraints on nucleon decay to 'invisible' modes such as n → 3v were investigated using data from the Sudbury Neutrino Observatory. The investigation was based on γ rays obtained from residual nucleus deexcitation on disappearance of either proton or neutron from 16O. An upper limit was deduced for γ ray decay greater than 90% confidence level for proton decay. This was found more stringent than previous constraints on invisible proton-decay modes.

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Journal Physical Review Letters
Ahmed, S.N. (S. N.), Anthony, A.E. (A. E.), Beier, E.W. (E. W.), Bellerive, A, Biller, S.D. (S. D.), Boger, J. (J.), … Zuber, K. (K.). (2004). Constraints on Nucleon Decay via Invisible Modes from the Sudbury Neutrino Observatory. Physical Review Letters, 92(10). doi:10.1103/PhysRevLett.92.102004