O16(p→,π+)17* at incident proton energies of 250, 354, and 489 MeV

Differential cross sections and analyzing powers are presented for the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$(p→,${\mathrm{\pi }}^{+}$ ${)}^{17}$O* reaction at $T_{\mathrm{p}}$=250, 354, and 489 MeV and compared with preliminary 200 MeV data as well as previously published data taken at other energies above and below the ${\Delta }_{1232}$ resonance region. The differential cross sections for each final state exhibit an energy dependence similar to that of the pp→d${\pi }^{+}$ reaction at equivalent center of mass energy and four-momentum transfer, as has been seen previously for (p,${\pi }^{+}$) reactions with other target nuclei. The shape of the analyzing power angular distributions varies with the ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}_{}^{\mathrm{*}}{}_{}{}^{}$ nuclear final state. Some states exhibit broad similarities with that of the p→p→d${\pi }^{+}$ reaction, while others are markedly different.