Abstract
Supermassive GUT magnetic monopoles have been searched for in the penetrating cosmic radiation with the MACRO detector at the Gran Sasso National Laboratory. We present updated results obtained by several analyses by using the MACRO streamer tubes, scintillators and nuclear track subdetectors. Stringent upper limits, below the Parkerbound, are imposed to theflux of GUT monopoles with velocity largerthan10 5 c. ehedescribedmethods werealsoappliedinthe searchfor nuclearites.
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