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2024-11-23 17:50

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Conference: Bucharest University Faculty of Physics 2019 Meeting

Section: Theoretical Physics and Applied Mathematics

Title:

Pygmy dipole resonance: from schematic approaches to microscopic transport models

Authors:

Virgil BARAN, Alexandru I. NICOLIN

Affiliation:

Faculty of Physics, University of Bucharest

E-mail

nicolin@nicolin.info

Keywords:

Pygmy dipole resonance, schematic models, microscopic transport approaches

Abstract:

We present various facets of the Pygmy Dipole Resonance (PDR), an elusive mode in nuclear systems which has been the subject of numerous experimental and theoretical investigations and is also part of the experiments proposed at ELI-NP. Our presentation is focused on both schematic models based on separable interactions and microscopic transport approaches which use the semiclassical Vlasov equation. Several prominent features of the PDR, including collectivity and the role of the symmetry energy, are discussed and a detailed comparison with experimental properties such as energy centroid and sum-rules is presented. Lastly, based on our results we propose a mechanism for the appearance of Pygmy Dipole Resonance and the development of the collectivity.

References:

1. V. Baran, B. Frecus, M. Colonna, M. Di Toro, A. Croitoru, and D. Dumitru, From neutron skin to pygmy dipole resonance: The role of the symmetry energy in a transport approach, Rom. J. Phys. 58, 1208 (2013).

2. A. Croitoru, V. Baran, T. Isdraila, M. Colonna, M. Di Toro, and M. Marciu, Pygmy dipole resonance in a schematic model, Rom. J. Phys. 60, 748 (2015).

3. V. Baran, D.I. Palade, M. Colonna, M. Di Toro, A. Croitoru, and A.I. Nicolin, Collectivity of the pygmy dipole resonance within schematic Tamm-Dancoff approximation and random-phases approximation models, Phys. Rev. C 91, 054303 (2015).

Acknowledgement:

This work was supported through the projects "Modelarea avansata a interactiilor electrodinamice si nucleare la ELI-NP" (AMENI), code 29-ELI, financed by IFA, "Dinamica sistemelor atomice si nucleare in lumina extrema", code PN-III-P4-ID-2016-0792, financed by UEFISCDI, and "Frontiers Research in Photon-Matter Interaction Using Extreme Helical Light Beams", code PN-III-P4-ID-PCCF- 2016-0164, financed by UEFISCDI.