Δ excitations in nuclei

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 functi...

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Bibliographic Details
Published in:Physics letters. B 1990-08, Vol.245 (1), p.1-6
Main Authors: Udagawa, T., Hong, S.-W., Osterfeld, F.
Format: Article
Language:English
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Summary: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.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(90)90154-X