Abstract
We analyze $\ensuremath{\pi}$-$^{16}\mathrm{O}$ elastic scattering at pion energies between 40 and 340 MeV. An excellent fit to the data follows from the inclusion of a second-order optical potential. The parameters specifying the second-order potential are found to exhibit marked resonance behavior. The magnitude and the energy dependence of the parameters of the second-order potential obtained for pion-oxygen scattering are, in the main, very similar to that determined for pion-carbon scattering. This result indicates that a universal parametrization of the second-order pion-nucleus optical potential may be possible.NUCLEAR REACTIONS Pion-oxygen scattering at 40, 49.7, 50, 79.3, 114.3, 162.6, 240.2, and 342.6 MeV. Parameters of second-order optical potential.
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