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We report the results of the first direct search for grand-unified-theory magnetic monopoles with adequate sensitivity to detect a flux as small as the Parker flux limit. If stable monopole-nucleus bound states exist then the observed absence of monopole tracks in our 4.6×{}10⁸-yr-old mica detector places an upper limit of 10^-17 to 10^-16 cm^-2 sr^-1 s^-1 on the flux of grand-unified-theory monopoles having velocity 3×10^-4c to 1.5×10^-3c.
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Price et al. (1984) studied this question.
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