We report a measurement of the fraction of events with a large
pseudorapidity gap Delta_eta within the pseudorapidity region available to
the proton dissociation products X in pbar + p --> pbar + X. For a final
state pbar of fractional momentum loss xi_pbar and 4-momentum transfer
squared t_pbar within 0.06 < xi_pbar < 0.09 and |t_pbar| < 1.0 [0.2] GeV2
at s**(1/2) = 1800 [630] GeV, the fraction of events with Delta_eta > 3 is
found to be 0.246 +/- 0.001 (stat) +/- 0.042 (syst) [0.184 +/- 0.001 (stat)
+/- 0.043 (syst]. Our results are compared with gap fractions measured in
minimum bias p anti-p collisions and with theoretical expectations.
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Updated: Tuesday, 2003 July 29 14:09:14 CDT automatically from input from "Carol I. Picciolo"