Summary
We have searched for anomalous slow or highly ionizing particles by measuring the dE/dx and the time of flight of penetrating cosmic rays using a telescope of plastic scintillators placed underground. No evidence was found for anomalous particles, since it resulted a, flux limit (90% confidence level) of about 6.10-13 cm-2 sr-1 s-1 for magnetic monopoles in the velocity range 5.10-4 < β < 1. Similar flux limit was also obtained for slow charged particles with integer or fractional charges.
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Kawagoe, K., Mashimo, T., Nakamura, S. et al. An underground search for anomalous slow penetrating particles. Lett. Nuovo Cimento 41, 315–319 (1984). https://doi.org/10.1007/BF02739586
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DOI: https://doi.org/10.1007/BF02739586