Excitation of the Δ resonance in the C12(e,e) reaction

Phys. Rev. C 38, 2187 – Published 1 November 1988
C. R. Chen and T.-S. H. Lee

Abstract

The inclusive (e,e) scattering from nuclei is studied with the assumption that the electromagnetic production of pions from the nucleon can be described by a model consisting of the conventional Born term and a Δ-excitation term. We show that the global features of the recent data of the inclusive C12(e,e) reaction in the GeV energy region can be described by the following procedures: (1) the parameters of the constructed one-body and two-body current operators are fitted to the total cross sections of γN→πN, p(e,e), and γd→np; (2) the medium effect on the Δ propagation is treated according to the information extracted from the Δ-hole model calculation. It is found that the two-body mechanism of Δ annihilation by the nuclear medium improves the fit to the data in the ‘‘dip’’ region. The predicted magnitudes in the Δ region are lower than the data, indicating the importance of more complicated multinucleon mechanisms.

DOI: http://dx.doi.org/10.1103/PhysRevC.38.2187

  • Received 17 March 1988
  • Published in the issue dated November 1988

© 1988 The American Physical Society

Authors & Affiliations

C. R. Chen and T.-S. H. Lee

  • Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

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