The theoretical concepts, to describe the pion-nucleus dynamics, have been developed almost exclusively within the context of investigations of elastic pion-nucleus scattering. The large body of experimental data on nuclear excitations in pion scattering has had little impact on our theoretical understanding of the pion nucleus interaction. First order theories, generally used to describe these processes, are too poor in their dynamical content. As is well known by now from the study of elastic scattering, there is no theoretical basis for a description of pion-nucleus scattering in terms of free pion-nucleon scattering. Pion nucleus elastic scattering can only be understood if one allows for large modifications if the pion nucleon interaction takes place in the nuclear environment. For pion scattering in the resonance region, the Δ-h formalism has proved to be particularly useful to account for these medium corrections. In the first part of this talk, I shall give a brief summary of the results obtained in applying the Δ-h formalism to elastic pion nucleus scattering.
KeywordsElastic Scattering Vector Coupling Nucleus Interaction Magnetization Current Tensor Coupling
Unable to display preview. Download preview PDF.
- 4).M. Hirata, F. Lenz and M. Thies, to be publishedGoogle Scholar
- 7).C.L. Morris, K.G. Boyer, C.F. Moore, C.J. Harvey, K.J. Kallianpur, I.B. Moore, P.A. Seidl, S.J. Seestrom-Morris, D.B. Holtkamp, S.J. Greene and W.B. Cottingame, Phys. Rev. C24 (1981) 231 “Research in Experimental Nuclear Physics”, W.J. Braithwaite and C.F. Moore, LASL preprint distributed at the Workshop on “Nuclear Structure with Intermediate Energy probes” Jan. 14–16, 1980 J.P. Egger, private communicationADSGoogle Scholar
- 10).Th. S. Bauer, J.J. Domingo, Q. Ingram, J. Jansen, G.Kyle, J. Zichy, R. Stamminger, F. Vogler, private communication.Google Scholar