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Both Si1 and Si2 time spectra
exhibited a small satellite peak for a prompt signal, which came 15 to 20
ns before the nominal time zero with an amplitude (averaged over two
detectors) of about 5% relative to the prompt peak. The origin of the
second peak is not clear, but if it contains real counts, the total yield
would be underestimated if we only counted the events in the prompt peak.
Again, it is negligible for the TOF and MOD measurements. The
possible effect on the US yield was estimated assuming the fusion decay
time of 100 ns to be less than 1%, hence we neglected the double peaking
effect in our analysis.