Proton-proton elastic scattering using 201-and 400-GeV/c extracted beams at Fermilab has been measured in the region 4.9

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Proton-proton elastic scattering has been measured in the region 4.9< \t I < 12.1 GeV 2 at a beam momentum of 201 GeV/c. If the form exp(A£) is fitted to the data, the exponent A gradually changes from 1.5 to 0.9 GeV" 2 over our t range. The data are consistent with the form exp(-6.6^±). A comparison with intersecting storage ring results shows that in this kinematical region the slopes are about the same, but dcr/dt at fixed t is still dropping with energy.

Proton-proton elastic scattering at 400 GeV/c has been measured in the region 5.4 < -t < 14,4 QeV 2 with no sign of a second dip or "break." If the data are fitted by exp(At), the slope A decreases from 1.5± 0.1 to 0.7± 0.2 GeV" 2 over the range. At fixed t the 400-GeV/c cross sections are about 0.6 times those at 200 GeV/c in this t range. At fixed 0_ m =15°, da/dt^s""where n= 9.7±0.3.

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