We have searched in niobium and tungsten for fractionally charged particles with effective nuclear charge Z=N+1/3 (where N=0, 1, 2, 3,). In addition, we have looked for fractionally charged particles with Z=2/3 and 5/3 in the same materials. No positive signal was observed, and concentration limits are reported.
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Milner et al. (1985) studied this question.
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