Friday, June 21, 2013

1306.4969 (V. Baran et al.)

Connecting Pygmy Dipole Resonance to neutron skin    [PDF]

V. Baran, M. Colonna, M. Di Toro, A. Croitoru, D. Dumitru
We study the correlation between the neutron skin development and the low-energy dipole response associated with Pygmy Dipole Resonance (PDR) in connection with the properties of symmetry energy. We perform our investigation within a microscopic transport model based on Landau-Vlasov kinetic equation by employing three different equations of state in the isovector sector. Together with Giant Dipole Resonance (GDR), for all studied systems, we identify a PDR collective mode whose energy centroid is very well described by the parametrization E_{PDR}=41 A^{-1/3}. A linear correlation between the Energy Weighted Sum Rule (EWSR) associated to PDR and the neutron skin thickness is evidenced. We conjecture that different nuclei having close neutron skin size will exhaust the same EWSR in the pygmy region. This suggests that a precise experimental estimate of total EWSR exhausted by PDR allows the determination of the neutron skin size and to constrain the slope parameter of the symmetry energy.
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