New limit set on cosmic-ray monopole flux by a large-area superconducting magnetic-induction detector
S. Bermon, C. C. Chi, C. C. Tsuei, J. R. Rozen, P. Chaudhari, M. W. McElfresh, A. Prodell
DOI 10.1103/PhysRevLett.64.839 · Physical Review Letters
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Abstract
A search for cosmic-ray magnetic monopoles has been conducted using a fully coincident superconducting induction detector consisting of six independent high-order gradiometer coils forming the surfaces of a rectangular parallelepiped. The detector had an effective area for isotropic flux averaged over 4π sr of 1.0 m2. Data have been collected from October 1986 to January 1989 with an accumulated live time of 13 410 h. No monopole candidate events were seen, setting a new lower monopole flux limit for induction detectors of 3.8×10−13 cm−2 s−1 sr−1 at the 90% confidence level.
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