Measurements of cross sections for pion-induced double-charge-exchange reactions to the double-isobaric-analog state for ${}_{}{}^{42,44,48}{}_{}{}^{}\mathrm{Ca}$ at incident pion energies of 300–550 MeV at ${\mathrm{\theta }}_{\mathrm{lab}}$=5° are reported, together with upper limits for cross sections for transitions to the residual ground states for ${}_{}{}^{44,48}{}_{}{}^{}\mathrm{Ca}$. The data are fitted with a two-amplitude model which gives expressions for cross sections for both transitions. The fit overpredicts the ground-state cross sections, indicating a failure of the model in this energy range.

• Received 2 April 1990

DOI:https://doi.org/10.1103/PhysRevC.43.766