Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-02-11
Nucl.Phys. A623 (1997) 391-430
Physics
Nuclear Physics
Nuclear Theory
LaTex2e file with 53 .ps figures; submitted to Nucl. Phys A
Scientific paper
10.1016/S0375-9474(97)88421-7
The splitting between the charge-longitudinal and spin-transverse responses is explained in a model whose inputs are the effective interactions in the particle-hole channels in the frame of the first order boson loop expansion. It is shown that the interplay between $\omega$-meson exchange and box diagrams (two-meson exchange with simultaneous excitation of one or two nucleons to $\Delta$'s) mainly rules the longitudinal response, while in the transverse one the direct $\Delta$ excitations almost cancel the one-loop correction and the response is mainly governed by the $\rho$-meson rescattering inside the nucleus. It is also shown that a small variation in the nuclear densities may explain the observed discrepancies between different nuclei.
Cenni Rinaldo
Conte F.
Saracco Paolo
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