  We present the results of searches for nucleon decay via bound neutron to
antineutrino plus pizero and proton to antineutrino plus piplus using data from
a combined 172.8 kiloton-years exposure of Super-Kamiokande-I, -II, and -III.
We set lower limits on the partial lifetime for each of these modes. For
antineutrino pizero, the partial lifetime is >1.1x10^{33} years; for
antineutrino piplus, the partial lifetime is >3.9x10^{32} years at 90%
confidence level.
