Abstract
An electromagnetic search for magnetic monopoles that requires very few assumptions about their properties has been performed in material exposed to protons accelerated at Fermilab, to electrons at SLAC, and to $pp$ interactions at the CERN ISR. The most significant irradiation (Fermilab, 300 GeV/c) produced 2.5 \ifmmode\times\else\texttimes\fi{} ${10}^{18}$ primary proton-aluminum interactions. No monopoles were found. If monopoles exist with masses less than 12 GeV, the probability of pair production in a proton-nucleon collision is of the order of ${10}^{\ensuremath{-}18}$ or less with 95% confidence.
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