The mass dependence of cross sections for double-isobaric-analog states from pion-induced double-charge-exchange reactions is examined with small-angle data taken at 450 and 500 MeV incident pion energies for several targets. New (${\mathrm{\pi }}^{+}$,${\mathrm{\pi }}^{\mathrm{-}}$) cross sections are reported for ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$,${\mathrm{}}^{46,50}$Ti, ${}_{}{}^{54,56}{}_{}{}^{}\mathrm{Fe}$,${\mathrm{}}^{52}$Cr, ${}_{}{}^{80}{}_{}{}^{}\mathrm{Se}$,${\mathrm{}}^{90}$Zr, ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$, and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$. The (${\mathit{f}}_{7/2}$${)}^{\mathit{n}}$ data are fitted to a two-amplitude model which contains expressions for cross sections for transitions to the DIAS and to nonanalog ground states in the residual nucleus.

• Received 16 May 1991

DOI:https://doi.org/10.1103/PhysRevC.44.2025