Kaon scattering from C and Ca at 800 MeV/<i>c</i>

Abstract

Results from ${K}^{\ifmmode\pm\else\textpm\fi{}}$ elastic and inelastic scattering from $^{12}\mathrm{C}$ and $^{40}\mathrm{Ca}$ are reported. The data were all taken at an incident momentum of 800 MeV/c over an angular range from 2\ifmmode^\circ\else\textdegree\fi{} to 38\ifmmode^\circ\else\textdegree\fi{}. The elastic data are compared to first-order optical model calculations in coordinate and momentum space; good qualitative agreement is obtained. The inelastic data (from $^{12}\mathrm{C}$ only) are compared to distorted-wave Born approximation calculations, and good agreement is found if "realistic" inelastic transition densities are used. Although a first-order optical potential description does not describe the data fully, there are strong indications of the increased penetrability of ${K}^{+}$ over ${K}^{\ensuremath{-}}$ in this energy range.NUCLEAR REACTIONS $^{12}\mathrm{C}$(${K}^{\ifmmode\pm\else\textpm\fi{}}$,${K}^{\ifmmode\pm\else\textpm\fi{}}$)$^{12}\mathrm{C}$, $^{40}\mathrm{Ca}$(${K}^{\ifmmode\pm\else\textpm\fi{}}$,${K}^{\ifmmode\pm\else\textpm\fi{}}$)$^{40}\mathrm{Ca}$, $E=442$ MeV (800 MeV/c), measured $\ensuremath{\sigma}(\ensuremath{\theta})$ for elastic and inelastic scattering, compared to optical model and DWBA calculations, deduced optical potential parameters; $\ensuremath{\theta}=2\ifmmode^\circ\else\textdegree\fi{}\ensuremath{-}38\ifmmode^\circ\else\textdegree\fi{}$, $\ensuremath{\Delta}\ensuremath{\theta}=1\ifmmode^\circ\else\textdegree\fi{}$.