Abstract
Differential cross sections for ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{-}}^{4}\mathrm{He}$ elastic scattering were calculated at energies between 110 and 260 MeV. The analysis is completely novel since we have used a covariant multiple scattering theory, and a complete integration over the motion of the target particles has been carried out (instead of invoking the fixed-scatterer approximation). The full dynamical effects of nuclear binding and Fermi motion are considered as well as some modification of the free $\ensuremath{\pi}N$ interaction. Theoretical results are in good agreement with the data.NUCLEAR REACTIONS Covariant optical potential, ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{-}}^{4}\mathrm{He}$ elastic scattering from 110 to 260 MeV.
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