Abstract
A 80 m 2 detector array consisting of two layers of CR-39 plastic track detector and an iron absorber was exposed at deep underground (2700 m.w.e.) in Kamioka mine for 1.8 yr. This plastic plate can detect tracks of penetrating monopoles with energy loss rate greater than that of a neucleus with \(Z/\beta \gtrsim 10\). Considering recoil of the C and O atoms in CR-39 due to diamagnetic repulsion, CR-39 plastic detector is considered to be sensitive to the monopoles at velocities down to about 10 -4 c. We have found no monopole candidate, and this implies that the upper limit on the flux of grand-unified-theory monopoles with υ∼10 -4 c or υ> 5.5×10 -3 c is 3.0×10 -14 cm -2 s -1 sr -1 at 90% confidence level.
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