An excitation function from $T_{\pi }$=50 to 120 MeV at ${\mathrm{theta}}_{\mathrm{lab}=35\mathrm{}}$° and an angular distribution at 60 MeV have been measured for the pion double-charge-exchange reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${\mathrm{\pi }}^{+}$,${\mathrm{\pi }}^{\mathrm{-}}$)${\mathrm{}}^{12\mathrm{O}(\mathrm{g}.\mathrm{s}.\mathrm{})\mathrm{}}$. The cross section is found to decrease with increasing energy. The ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ excitation function and the angular distribution are very similar in shape to those of the double-isobaric-analog-state transitions observed for ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$, but the magnitude is a factor of 6 smaller.

• Received 6 October 1986

DOI:https://doi.org/10.1103/PhysRevC.35.1570