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Huge water detectors watch for this rare event.","posed_since":"1974","precise":"Measure or bound $\\tau(p \\to e+ \\pi0)/B$, currently $> 2.4 \\times 10^{34}\\,\\mathrm{yr}$ (Super-Kamiokande, 2020, 90 percent CL). Non-supersymmetric $\\mathrm{SO}(10)$ models with intermediate scales typically predict $10^{34}\\text{ to }10^{36}\\,\\mathrm{yr}$. An answer is a detection or a limit near $10^{35}\\,\\mathrm{yr}$.","problem_ref":"e26a954814709de6a21c0c6742078135befff4d202e9194d2771193699e31948","references":"","settled_by":"Hyper-Kamiokande exposure of about 1 to 2 Mt-yr reaching $\\sim 10^{35}\\,\\mathrm{yr}$ sensitivity.","status_note":"Hyper-Kamiokande construction is under way, with data expected late in the 2020s.","title":"Is the proton lifetime to $e+ \\pi0$ below 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