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The sensitivity of scintillators to grand unification monopoles and other supermassive charged particles is inferred from measurements of scintillation by recoil protons with velocities as low as 2.5×{}10^-4c. No evidence for a response cutoff is observed at velocities extending well below the electronic-excitation threshold of 6×{}10^-4c expected from two-body kinematics. The relevance of these measurements to searches for supermassive relic charged particles is discussed.
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Ficenec et al. (1987) studied this question.
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