Abstract
We point out that two models that reconcile the neutron lifetime anomaly via dark decays of the neutron, also predict dark matter-neutron ( overline{chi} − n) annihilation that may be observable in neutron-antineutron oscillation and proton decay searches at Super-Kamiokande, Hyper-Kamiokande and DUNE. We study signatures of overline{chi} n → γπ0 (or multi-π0) and overline{chi} n → ϕγπ0 (or ϕ+multi-π0), where ϕ is an almost massless boson in one of the two models.
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