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Published April 8, 1985 | public
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Search for fractional charges in niobium and tungsten


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.

Additional Information

©1985 The American Physical Society. Received 10 January 1985. This research was supported by the National Science Foundation under Grant No. PHY82-15500 and by the California Institute of Technology Sloan Fund.


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