We report the results of an experiment designed to search for superheavy isotopes of hydrogen. Based on the centrifugation of sea water, followed by atomic spectroscopy, it is sensitive to large masses from 10 4 up to 10 8 GeV/c 2 . The relative abundance of such hypothetical atoms, compared to ordinary hydrogen, is found to be less than about 6x 10 -15 . This may be used to exclude charged dark matter particles between 10 4 and 10 7 GeV/c 2 .
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