Angular distribution of the longitudinalp→p→spin correlation parameterAzzat 197.4 MeV

Abstract

A polarized proton beam with a large longitudinal polarization component of $0.545\ifmmode\pm\else\textpm\fi{}0.005$ (96% of the total polarization) was prepared in a storage ring (IUCF--Cooler). This was achieved by means of spin precession solenoids in two of the six straight sections of the ring. A polarized hydrogen storage cell target internal to the ring was used to measure the longitudinal spin correlation coefficient ${A}_{\mathrm{zz}}$ in $\mathrm{pp}$ elastic scattering over the laboratory angular range $5.5\ifmmode^\circ\else\textdegree\fi{}$--$43.5\ifmmode^\circ\else\textdegree\fi{} ({\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}=11.5\ifmmode^\circ\else\textdegree\fi{}$--$90\ifmmode^\circ\else\textdegree\fi{})$ with statistical errors of typically 0.025. The absolute normalization was determined to an accuracy of 2.0% by use of the identity ${A}_{\mathrm{yy}}\ensuremath{-}{A}_{\mathrm{xx}}\ensuremath{-}{A}_{\mathrm{zz}}\ensuremath{\equiv}1$ at ${\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}=90\ifmmode^\circ\else\textdegree\fi{}.$ The identity also allows a reduction of the scale factor uncertainty of the previously published analyzing powers and spin correlation coefficients. The results are compared to recent $\mathrm{pp}$ partial wave analyses and $\mathrm{NN}$ potential models.