Abstract
We have measured the pp elastic cross section at incident antiproton momenta of 1.24, 1.32, 1.54 and 1.62 GeV/ c to be 43.2 ± 3.5, 43.3 ± 3.0, 38.5 ± 3.0 and 37.2 ± 3.0 mb respectively. The differential cross section in this momentum range is dominated by a diffraction peak for which the slope is found to decrease with incident momentum, consistent with the established “anti-shrinkage” of the pp diffraction peak [3]. The differential cross section shows a well-defined dip at cos θ c.m. ≈ 0.4 followed by a broad maximum and a sharp backward peak largely confined to the interval cos θ c.m. < −0.8.
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