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On the role of the $Delta (1232)$ on the transverse nuclear response in the $(e,e')$ reaction | | E. Bauer
; | | Date: |
6 Dec 1997 | | Journal: | Nucl.Phys. A637 (1998) 243-279 | | Subject: | nucl-th | | Abstract: | The transverse nuclear response to an electromagnetic probe which is limited to create (or destroyed) a particle-hole ($ph$) or delta-hole ($Delta h$) pair is analyzed. Correlations of the random phase approximation (RPA) type and self energy insertions are considered. For RPA correlations we have developed a scheme which includes explicitly the $Delta$ and the exchange terms. Self energy insertions over $ph$ and $Delta h$ bubbles are studied. Several residual interactions based on a contact plus a ($pi +
ho$)-meson exchange potential are used. All calculations are performed in non-relativistic nuclear matter. The main effect of the $Delta$ is to reduce the intensity over the nuclear quasi-elastic peak. Exchange RPA terms are very important, while the self energy depends strongly on the residual interaction employed. We compare our final result with data for $^{40}Ca$ at momentum transfer $q=410$ and $q=550$ MeV/c. | | Source: | arXiv, nucl-th/9801006 | | Services: | Forum | Review | PDF | Favorites | |
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