Pion double charge exchange onT=2 nuclei in theΔ3/2,3/2resonance region

We present cross sections for the reactions ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$ ${,}^{56}$Fe(${\mathrm{\pi }}^{+}$,${\mathrm{\pi }}^{\mathrm{-}}$) leading to the residual ground states and double-isobaric-analog states (DIAS) for incident pion energies from 100 to 300 MeV. Data include both angular distributions and 5° excitation functions. Ground-state cross sections were also obtained from the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ contaminants in the ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$ target. The DIAS data are compared to known systematics and to theoretical predictions. Some features of the data are reproduced by the theoretical predictions, but major discrepancies exist.