Measurement of the antiproton-proton total cross section at sqrt s =546 and 1800 GeV.
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1994 The American Physical Society We report a measurement of the proton-antiproton total cross section T at c.m.s. energies s =546 and 1800 GeV. Using the luminosity- independent method, we find T=61.260.93 mb at s =546 GeV and 80.032.24 mb at s =1800 GeV. In this energy range, the ratio el/T increases from 0.2100.002 to 0.2460.004.