Elastic and inelastic scattering of 291-MeV pions byBe9, Si,Ni58, andPb208

Abstract

Angular distributions for the elastic and inelastic scattering of 291-MeV ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}$ by $^{9}\mathrm{Be}$, Si, $^{58}\mathrm{Ni}$, and $^{208}\mathrm{Pb}$ have been measured. The characteristics of two first-order optical potentials have been investigated, and reasonable agreement with the elastic scattering data has been obtained. Macroscopic distorted-wave impulse approximation calculations of the inelastic scattering with Kisslinger potentials are reasonably successful in reproducing the experimental data. The inelastic scattering results for $^{9}\mathrm{Be}$ provide evidence for the importance of radial localization effects in pion inelastic scattering.NUCLEAR REACTIONS $^{9}\mathrm{Be}(\ensuremath{\pi},{\ensuremath{\pi}}^{\ensuremath{'}})$, $\mathrm{Si}(\ensuremath{\pi},{\ensuremath{\pi}}^{\ensuremath{'}})$, $^{58}\mathrm{Ni}(\ensuremath{\pi},{\ensuremath{\pi}}^{\ensuremath{'}})$, $^{208}\mathrm{Pb}(\ensuremath{\pi},{\ensuremath{\pi}}^{\ensuremath{'}})$, ${E}_{\ensuremath{\pi}}=291$ MeV, measured $\frac{d\ensuremath{\sigma}}{d\ensuremath{\Omega}}$; optical potential and DWIA collective analyses.