Magnetic Monopole Search with the MACRO Detector at Gran Sasso

Abstract In this letter we present the results of the search for massive magnetic monopoles in the penetrating cosmic ray radiation using the various subdetectors of the MACRO apparatus, during the period 1989–1995. Flux limits are given for the β = v c range 4 × 10 −5 −4 −1 the limits are below the Parker bound, ∼ 10 −15 cm −2 s −1 sr −1 .