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Pion-nucleon interaction in nuclear matter above the Delta resonance energy

机译：核物质中的π-核子相互作用高于三角共振能量

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We investigate the (pi)-nucleus interaction for 600 - 900 MeV/c by microscopically examining dynamical modifications of N(sup *) resonances in nuclear matter. The pion production through the (pi)(Delta) channel is appreciably suppressed in nuclei because the pion produced suffers strong distortion by a (Delta) formation with a neighboring nucleon. This effect makes the width of N(1520) smaller and the mass larger in nuclei than in free space, and the (pi)N D(sub 13)-wave amplitude loses much of its inelasticity in nuclei. A similar situation arises with N(1535) and the (pi)N S(sub 11)-wave amplitude because the (eta)N channel is suppressed by Pauli blocking on the nucleon accompanying (eta). These effects, however, change the (pi)-nucleus elastic-scattering cross sections by only a small amount because of Fermi averaging. They may appear significantly in some inelastic reactions. Spreading potential makes the width of N(sup *) larger and counteracts the pion-production suppression, but it cannot explain the puzzling disagreement between the data and the calculations. (author). (ERA citation 19:005657)

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