Complete angular distribution measurements ofppspin correlation parametersAxx,Ayy,andAxzand analyzing powerAyat 197.4 MeV

Abstract

Measurements of $\mathrm{pp}$ spin correlation coefficients ${A}_{\mathrm{xx}},$ ${A}_{\mathrm{yy}},$ and ${A}_{\mathrm{xz}}$ and analyzing power ${A}_{y}$ for $\mathrm{pp}$ elastic scattering at 197.4 MeV over the laboratory angular range 3.5 \ifmmode^\circ\else\textdegree\fi{}--43.5 \ifmmode^\circ\else\textdegree\fi{} $({\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}=7\ifmmode^\circ\else\textdegree\fi{}--90\ifmmode^\circ\else\textdegree\fi{})$ have been carried out. The typical statistical accuracy per 1$\ifmmode^\circ\else\textdegree\fi{}$ angle bin is better than 0.02 for the ${A}_{\mathrm{mn}}$ and better than 0.005 for ${A}_{y}.$ Systematic errors are negligible except for an overall normalization uncertainty of 2.5% for ${A}_{\mathrm{mn}}$ and 1.3% for ${A}_{y}.$ The experiment makes use of a polarized hydrogen gas target internal to a proton storage ring (IUCF Cooler) and a circulating beam of polarized protons. The target polarization is switched in sign and direction $(x,y,z)$ every 2 s by reversing a weak guide field $(\ensuremath{\approx}0.3$ mT). Scattered and recoil protons are detected in coincidence by two sets of wire chambers, by scintillators, and by silicon-strip recoil detectors placed 5 cm from the proton beam. Analysis methods and comparison to recent $\mathrm{pp}$ partial-wave analyses and $\mathrm{NN}$ potential models are described.