Pion inelastic scattering to low-lying positive-parity states in 20Ne.

Abstract

We have measured pion inelastic scattering from $^{20}\mathrm{Ne}$ with 180 MeV ${\mathrm{\ensuremath{\pi}}}^{+}$ and ${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$ at 12\ifmmode^\circ\else\textdegree\fi{} and from 15\ifmmode^\circ\else\textdegree\fi{} to 90\ifmmode^\circ\else\textdegree\fi{} in 5\ifmmode^\circ\else\textdegree\fi{} steps and with 120 MeV ${\mathrm{\ensuremath{\pi}}}^{+}$ from 15\ifmmode^\circ\else\textdegree\fi{} to 90\ifmmode^\circ\else\textdegree\fi{} in 5\ifmmode^\circ\else\textdegree\fi{} steps. We report here on states in the first four ${\mathit{K}}^{\mathrm{\ensuremath{\pi}}}$=${0}^{+}$ bands, including the 6.73MeV ${0}^{+}$ and the 8.78-MeV $^{6+}$ levels. Coupled-channels processes are shown to be important for many states.