Antiproton-Neutron Elastic Scattering at 3.5 GeV/c

Abstract

We have measured the $\overline{p}n$ differential elastic cross section for $-t\ge 0.15$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. We compare our data with existing data from $\overline{p}p$ and $\mathrm{np}$ elastic scattering experiments in this energy region. Our data show a dip in the cross section at $-t\simeq 0.45$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ and a secondary maximum at $-t\simeq 0.7$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. We see no evidence for backward peaking in $\overline{p}n$ elastic scattering at this energy. Evidence is presented for $I=1\mathrm{}$, $t$-channel exchange in $\overline{N}N$ scattering.