Field-theoretical description of~pion-nucleus scattering
Teoretičeskaâ i matematičeskaâ fizika, Tome 44 (1980) no. 3, pp. 373-380

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Interaction between pions are nuclei is treated by means of field-theoretic methods. General expressions for the amplitudes of elastic scattering, inelastic scattering and absorption are obtained. As an example, the approximate treatment of the inelastia scattering of pions near the $\Delta_{33}$ resonance is given.
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     title = {Field-theoretical description of~pion-nucleus scattering},
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S. V. Akulinichev; G. M. Vagradov; A. A. Goi. Field-theoretical description of~pion-nucleus scattering. Teoretičeskaâ i matematičeskaâ fizika, Tome 44 (1980) no. 3, pp. 373-380. http://geodesic.mathdoc.fr/item/TMF_1980_44_3_a7/