Unique search for grand unification magnetic monopoles
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Abstract
We describe a new technique for searching for slowly moving, supermassive magnetic monopoles employing a single thick slab of PS-10 acrylic scintillator at sea level. Monopoles would be identified by the abnormally wide photomultiplier-tube anode signal produced as they traverse the thick slab at very low velocity ($\ensuremath{\sim}{10}^{\ensuremath{-}3} c$). The scintillation response to supermassive monopoles is reviewed, and the results of a calculation of the response of PS-10 are presented. No monopole candidates were observed in 3852 h of running time, and a limit on the flux $F$ of supermassive monopoles, $F\ensuremath{\lesssim}4.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}$ ${\mathrm{cm}}^{\ensuremath{-}2}$${\mathrm{sr}}^{\ensuremath{-}1}$${\mathrm{s}}^{\ensuremath{-}1}$ (single-event significance) for monopole velocities $6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4} c\ensuremath{\lesssim}V<2.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3} c$, is set. This result is compared to other experimental limits and to theoretical limits on the flux.
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