Pion-induced single charge exchange in deuterium.

Abstract

We report the measurement of the differential cross section for $^{2}\mathrm{H}$(${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$,${\mathrm{\ensuremath{\pi}}}^{0}$) for laboratory angles 0\ifmmode^\circ\else\textdegree\fi{}--145\ifmmode^\circ\else\textdegree\fi{}, at incident pion energies of 164, 263, and 371 MeV. A Faddeev calculation at 164 MeV incorporating Pauli-blocking and multiple-scattering effects describes those data well. At the two higher energies the $^{2}\mathrm{H}$(${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$,${\mathrm{\ensuremath{\pi}}}^{0}$) cross section is essentially identical to the $^{1}\mathrm{H}$(${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$,${\mathrm{\ensuremath{\pi}}}^{0}$) cross section, except at forward angles where the former is suppressed by the Pauli principle. This experiment was the first to make use of a major component of the Neutral Meson Spectrometer at the Los Alamos National Laboratory.