Spin correlation parameter and analyzing power in<i>n</i>-<i>p</i>elastic scattering at intermediate energies

Abstract

In order to improve existing I=0 phase shift solutions, the spin correlation parameter ${A}_{\mathrm{NN}}$ and the analyzing powers ${A}_{0N}$ and ${A}_{N0}$ have been measured in n-p elastic scattering over an angular range of 50\ifmmode^\circ\else\textdegree\fi{}--150\ifmmode^\circ\else\textdegree\fi{} (c.m.) at three neutron energies (220, 325, and 425 MeV) to an absolute accuracy of \ifmmode\pm\else\textpm\fi{}0.03. The data have a profound effect on various phase parameters, particularly the $^{1}\mathrm{P}_{1}$, $^{3}\mathrm{D}_{2}$, and ${\ensuremath{\epsilon}}_{1}$ phase parameters which in some cases change by almost a degree. With the exception of the highest energy, the data support the predictions of the latest version of the Bonn potential. Also, the analyzing power data (${A}_{0N}$ and ${A}_{N0}$) measured at 477 MeV in a different experiment over a limited angular range [60\ifmmode^\circ\else\textdegree\fi{}--80\ifmmode^\circ\else\textdegree\fi{} (c.m.)] are reported here.