Backwardp¯pCharge Exchange from 1 to 3 GeV/c

Abstract

We have measured the differential cross section for $\overline{p}p\to \overline{n}n$ near 180° in the center of mass for incident $\overline{p}$ momenta between 1 and 3 GeV/c. A backward peak is observed at all energies, whose slope increases with increasing momentum. The $s$ dependence shows some departure from smooth behavior. The magnitude of backward charge-exchange scattering is comparable to backward elastic scattering and thus rules out a diffractive interpretation of the $s$-dependent structure.