Antiproton-Neutron Elastic Scattering near 1.8GeVc

Abstract

Antiprotron-deuteron inelastic-scattering differential cross sections have been measured near 1.8 $\frac{\mathrm{GeV}}{c}$. An impulse approximation is employed to extract antiproton-neutron differential cross sections. The technique allows us to study this reaction in a low-momentum-transfer region ($0.03<\mathrm{}\left|t\right|<0.15\mathrm{}$ Ge${\mathrm{V}}^2$) never explored before. Our data indicate that the real part of the antiproton-neutron forward scattering amplitude is consistent with zero. A comparison of antiproton-proton and anitproton-neutron differential cross sections confirms the previously reported crossover phenomenon in the region of the first diffraction minimum.