We have used the (${\pi }^{\mathrm{-}}$,${\pi }^0$) reaction at a beam energy of 475 MeV on targets of ${}_{}{}^1{}_{}{}^{}\mathrm{H}$, ${}_{}{}^2{}_{}{}^{}\mathrm{H}$, C, and ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$ to examine excitations near 300 MeV. At this excitation energy, delta production is expected to occur by charge exchange on a nucleon. Our (${\pi }^{\mathrm{-}}$,${\pi }^0$) results for delta production in complex nuclei are compared to those for photoabsorption, (p,n), and ${(}^3$He,t) reactions. The target mass dependence of the absorption for the three charge-exchange reactions is found to be similar.

• Received 6 October 1986

DOI:https://doi.org/10.1103/PhysRevC.35.1028