Results of a magnetic-monopole search utilizing a large-area proportional-tube array

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Abstract
The results of a recent magnetic-monopole search are presented. The detector is an array of He-CH4 proportional tubes whose effective area-solid-angle product is 265 m2sr. For a live time of 578 days, no bare monopole candidates were observed, setting an upper flux limit of 1.8×10−14 cm−2 sr−1 s−1 (90% C.L.) for β>1.1×10−4.