Analyzing Power in Proton-Nucleus Elastic Scattering at 0.8 GeV

Abstract

The first elastic-scattering analyzing-power ($A_y$) data at 0.8 GeV are presented and discussed. Angular distributions of $A_y$ over the range 2° to 20° (30° for ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$) have been obtained for ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$, ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$, and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ using the high-resolution spectrometer at the Clinton P. Anderson Meson Physics Facility. The analyzing powers oscillate sharply over positive values in qualitiative agreement with expectations.