Abstract
An approach is proposed for the investigation of delta (Δ) excitations in nuclei induced by intermediate energy charge exchange reactions. The approach is based on the isobar-hole model which treats the dynamics of the Δ in the nucleus explicitly. The distortion effects of the projectile wave functions and the δ-hole correlations in the nucleus are included properly. It is found that the Δ-hole correlations mediated by the energy-dependent π-exchange interaction of the spin longitudinal channel shifts the Δ-peak position downwards in energy by ∼ 30 MeV. The origin of this shift is explained in detail.
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