Abstract
Explicit expressions for one- and two-N ∗ isobar configurations in closed shell nuclei have been derived in the impulse approximation and applied to 4He and 16O. Conventional transition potentials with π- and ϱ-exchange have been used and the influence of potential regularization and short-range correlations have been studied. The dominant isobar configurations are found to be the one- and two-Δ components and originate from two-nucleon pairs in a relative S-state. The probability for finding a nucleon as a Δ-isobar is about 4.5% in 4He and about 3.2% in 16O. These numbers should be considered as upper limits due to uncertainties in off-shell effects of the transition potentials.
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