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Run Series II was our production run, where the measurement of molecular formation via time of flight was attempted. Improvements in the
target system had been made after Series I. The gas diffuser was replaced
with the one with sintered metal to ensure microscopic uniformity of the
target film. The gas transfer tubing was modified to remove the problem of
gas remaining in the transfer tube which had caused uncertainties in thin
layer thicknesses. Target support foil spacing was reduced from 39 mm to
17.9 mm, in order to increase at the downstream reaction layer the number
of
for energies 0.5-2 eV, at which the largest resonances were
predicted. The MWPC imaging system, which would not have been as effective
due to the smaller foil spacing, was replaced by another silicon
detector. The z-dimension (beam direction) of both of 2000 mm2 silicon
detectors were collimated to 13.9 mm, to view only the inner side of the Au
foils, where target films exist, with reasonable (i.e., non-grazing)
angles.
Shown in Tables 4.3 and 4.4 is the run summary for Series 2. The standard emission targets with tritium concentration 0.1% (SET1) and 0.2% (SET2) were used with deuterium overlayers shown with in the table. The GMUs were taken from the GMU scalers, but the runs with (*) in the table (Run 1684-90) had a problem with an ADC affecting silicon detector normalization, which will be corrected in Section 8.1.2.
Apart from the data for TOF measurements of molecular formation, test data
for new experiments were taken during this run, which resulted in new
proposals. These include precision measurement of muonic atom scattering
cross sections
and direct measurement of the
CF efficiency-limiting sticking probability.