Results from the Soudan 2 detector

The Soudan 2 underground detector is a large fine-grained tracking calorimeter comprised of long drift tubes read out by proportional wires. It is surrounded by a proportional tube shield. Preliminary nucleon decay results with 0.5 fiducial kT-yr exposure give 90% CL lower limits of τ/B > 4.5 x 1030yr for the mode p → K+ν. A search for GUT magnetic monopoles making highly ionizing tracks yielded a 90% CL upper flux limit of 8.7 x 10-15 cm-2s-1sr-1 for monopole velocities of β > 2 x 10-3 in data taken over almost three years