Pion double charge exchange on sup 42,44,48 Ca for 300 le T sub. pi. le 550 MeV

Measurements of cross sections for pion-induced double-charge-exchange reactions to the double-isobaric-analog state for {sup 42,44,48}Ca at incident pion energies of 300--550 MeV at {theta}{sub lab}=5{degree} are reported, together with upper limits for cross sections for transitions to the residual ground states for {sup 44,48}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.