Inclusive Pion Double Charge Exchange inO16andCa40

The first systematic study of inclusive pion double charge exchange in nuclei is reported. Doubly differential cross sections for the reactions ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}({\pi }^{+}, {\pi }^{-})X$ and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}({\pi }^{+}, {\pi }^{-})X$ have been measured at incident pion energies of 120, 150, 180, 210, 240, and 270 MeV at three to five angles in the range from 25° to 130° with complete coverage of the outgoing pion energy spectrum. Similarly, the reactions ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}({\pi }^{-}, {\pi }^{+})X$ and ${}_{}{}^{40}{}_{}{}^{}\mathrm{C}({\pi }^{-}, {\pi }^{+})X$ were studied at 180, 210, and 240 MeV at three angles.