Abstract
Using two versions of Galileo-invariant optical model,π −-4He elastic scattering cross sections were calculated in the energy interval 50–260 MeV. Level shifts and widths of several lightπ-mesoatoms were estimated in the Born approximation. Whereas the (A+1)-body model appears to be more suitable in the resonance region, the two-body model yields surprisignly good results for both the low-energy scattering and the characteristics ofπ-mesoatoms.
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I acknowledge stimulating discussions with V. B. Belyaev, R. A. Eramzhyan, M. Gmitro, M. G. Sapozhnikov and Yu. A. Shcherbakov. I am indebted to M. Gmitro also for critical reading of the manuscript.
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Mach, R. Galileo-invariant theory of low energy pion-nucleus scattering. Czech J Phys 33, 772–786 (1983). https://doi.org/10.1007/BF01589750
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DOI: https://doi.org/10.1007/BF01589750