Double charge exchange to the double isobaric analog state at T_π ∼292 MeV

Measurements of cross sections for the (π⁺π^-) reaction to the double isobaric analog state on targets of ³⁰Si, ³⁴S, ⁴⁴Ca, ⁵⁰Ti, ⁵¹V, ⁵²Cr, and ⁵⁸Ni at θ_lab=5°and an incident pion kinetic energy of ∼292 MeV are presented. We also present limits for the cross section to the residual ground state for the four T>1 targets. The data are compared with a phenomenological two-amplitude model and with a two-amplitude model that uses seniority-zero shell-model wave functions. The latter model provides expressions for both ground state and double isobaric analog state cross sections.