Search for nucleon decay with final states {ell}+{eta}{sup o}, {ovr nu}{eta}{sup o}, and {ovr nu}{pi}{sup =,o} using Soudan 2.

We have searched for nucleon decay into five two-body final states using a 4.4 kiloton-year fiducial exposure of the Soudan 2 iron tracking calorimeter. For proton decay into the fully visible final states {mu}{sup +}{eta}{sup 0} and e{sup +}{eta}{sup 0}, we observe zero and one event, respectively, that satisfy our search criteria for nucleon delay. The lifetime lower limits (t/B) thus implied are 89 x 10{sup 30} years and 81 x 10{sup 30} years at 90% confidence level. For neutron decay into {ovr eta}{sup 0}, we obtain the lifetime lower limit 71 x 10{sup 30} years. Limits are also reported for neutron decay into {ovr {pi}}{sup 0}, and for proton decay in {pi}{sup +}.