Status of the Frejus nucleon decay experiment

The Frejus proton lifetime detector is a 904 ton fine grain calorimeter located in the Frejus tunnel in the Alps, at the French Italian border, at a depth of 4800 MWE. Its mounting has just been completed (March 1985) and part of the detector has been operated for about 1 year. Fourteen contained events (corresponding to a fiducial tonnage of 200 ton year) have been observed among which no candidates for nucleon decay in the modes e+π0-μ+K0-. Samples of 71 000 single mu and of 2000 multimuons have been reconstructed; they are currently analysed in view of determining the primary cosmic ray composition at energies around 105 to 106 GeV and for point source origin effects