p¯nElastic Scattering from−t=0.15to 1.0(GeV/c)2at 3.5 GeV/c

Abstract

We have measured the $\overline{p}n$ differential elastic cross section in the four-momentum-transfer region of $-t=0.15\mathrm{}$ to 1.0 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ using neutron scatters obtained in a $\overline{p}d$ bubble chamber experiment at 3.5 GeV/c. The $\overline{p}n$ elastic cross section is similar to the $\overline{p}p$ cross section at this energy to the extent that both cross sections exhibit a diffraction peak and a dip at $-t\simeq 0.45$ followed by a secondary peak. A comparison of $\overline{p}n$ and $\overline{p}p$ elastic scattering indicates a crossing of the two cross sections near the region of the dip. The results of this experiment suggest the presence of an $I=1\mathrm{}$, $t$-channel exchange in $\overline{N}N$ scattering.