  We consider nucleon-decay-like signatures of the hylogenesis, a variant of
the antibaryonic dark matter model. For the interaction between visible and
dark matter sectors through the neutron portal, we calculate the rates of dark
matter scatterings off neutron which mimic neutron-decay processes $n\to
\nu\gamma$ and $n\to \nu e^+ e^-$ with richer kinematics. We obtain bounds on
the model parameters from nonobservation of the neutron decays by applying the
kinematical cuts adopted in the experimental analyses. The bounds are generally
(much) weaker than those coming from the recently performed study of events
with a single jet of high transverse momentum and missing energy observed at
the LHC. Then we suggest several new nucleon-decay like processes with two
mesons in the final state and estimate (accounting for the LHC constraints) the
lower limits on the nucleon lifetime with respect to these channels. The
obtained values appear to be promising for probing the antibaryonic dark matter
at future underground experiments like HyperK and DUNE.
