Abstract
A missing-mass experiment in p-bard ..-->.. NX, where X is the system whose mass M/sub X/ is measured, was performed for interactions of antiprotons at rest and in flight below 500 MeV/c. The 4-standard-deviation upper limit for the production of narrow states, in the mass interval M/sub X/=1650--1930 MeV/c/sup 2/, is 2 mb for annihilations in flight and 0.3% of the annihilations at rest.
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