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Search for nuclear fusion in deuterated targets under cluster-beam impact.

Stimulated by the recent report of Beuhler, Friedlander, and Friedman on the observation of {ital dd} fusion under the impact of heavy-water clusters on deuterated solid targets, we undertook a similar study with pure deuterium clusters (D{sub 200}{sup +}--D{sub 300}{sup +}) in the same range of incident energy per deuteron (less than 1 keV). We observed no fusion event and our upper limit for the fusion rate is more than 1 order of magnitude below the Brookhaven value. Additional measurements performed with {ital N}{sub {ital n}}{sup +} projectiles were not conclusive but showed that beam-contamination problems may be very serious.