Search for cosmic magnetic monopoles

A search for a flux of massive cosmic monopoles predicted by the grand unified theories of strong, electromagnetic and weak interactions, was performed using an upgraded cosmic ray telescope of scintillation counters. The experiment was sensitive to monopoles, coming from above and from below the earth surface, with a velocity 10-3< or approx.β< or approx.0.4. An upper limit of approx.=3 x 104 monopoles per m2 sr day (90% CL) was obtained. (orig.)