The four-momentum-transfer dependences of the quasielastic and Δ peak positions seen in electron-nucleus scattering are interpreted in terms of momentum-dependent potentials. We have used data on the Δ peak position for ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, C, and Fe, approximately corrected for the effects of competing reaction mechanisms, to estimate the depth and momentum range of the real part of the potential felt by a Δ resonance in nuclei. We find that the Δ-nucleus potential is deeper than the nucleon-nucleus potential for q<950 MeV/c.

• Received 16 October 1989

DOI:https://doi.org/10.1103/PhysRevC.42.2290