Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-07-17
Nucl.Phys. A624 (1997) 449-458
Physics
Nuclear Physics
Nuclear Theory
11 pages 8 figures, use elsart.sty and graphics package
Scientific paper
10.1016/S0375-9474(97)00485-5
The evolution of the Dipole Response in nuclei with strong neutron excess is studied in the Hartree-Fock plus Random Phase Approximation with Skyrme forces. We find that the neutron excess increases the fragmentation of the isovector Giant Dipole Resonance, while pushing the centroid of the distribution to lower energies beyond the mass dependence predicted by the collective models. The radial separation of proton and neutron densities associated with a large neutron excess leads to non vanishing isoscalar transition densities to the GDR states, which are therefore predicted to be excited also by isoscalar nuclear probes. The evolution of the isoscalar compression dipole mode as a function of the neutron excess is finally studied. We find that the large neutron excess leads to a strong concentration of the strength associated with the isoscalar dipole operator $\sum_ir^3_iY_{10}$, that mainly originates from uncorrelated excitations of the neutrons of the skin.
Catara Francesco
Lanza E. G.
Nagarajan M. A.
Vitturi Andrea
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