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UNIVERSITY OF BUCHAREST FACULTY OF PHYSICS Guest 2024-11-23 17:48 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Theoretical Physics and Applied Mathematics
Title: Isospin and mass dependence of Pygmy Dipole Resonance in neutron-rich nuclei
Authors: V. BARAN, Andeea CROITORU, D. DUMITRU
Affiliation: Faculty of Physics, University of Bucharest
E-mail virbaran@yahoo.com
Keywords: Vlasov equation, Nuclear dynamics, Pygmy Dipole Resonance, Nuclear polarizability
Abstract: We investigate the dipole response of atomic nuclei within a model based on a system of two coupled Vlasov equations for protons and neutrons. This formalism is obtained as the semiclassical limit of Wigner tranformation of Time Dependent Hartree-Fock (TDHF)equations. From numerical simulations we conclude that the polarizability follows a mass dependence consistent with the Migdal predictions, but with a slope which is influenced by the density dependence of the symmetry energy around saturation. Then we estimate the energy weighted dipole sum-rule exhausted by Pygmy Dipole Resonance for an isotopic chain of Sn and find a quadratic evolution with isospin parameter of the system. We interpret these results as being linked to the polarization effects of the isovector density
which manifest in finite systems.
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