UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2022-07-01 17:21

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Conference: Bucharest University Faculty of Physics 2019 Meeting


Section: Theoretical Physics and Applied Mathematics


Title:
Robustness of the schematic models for Pygmy Dipole Resonance


Authors:
Tudor-Alexandru ISDRAILA(1,2,3), Virgil BARAN(1)


*
Affiliation:
1)Faculty of Physics, University of Bucharest, 405 Atomistilor, POB MG-11, RO-077125 Bucharest-Magurele, Roumania

2)Horia Hulubei National Institute of Physics and Nuclear Engineering, 077125 Bucharest-Magurele, Romania

3)PhD School, Physics Faculty, University of Bucharest


E-mail
t.isdraila@theory.nipne.ro


Keywords:
Giant Dipole Resonance, Pygmy Dipole Resonance


Abstract:
Tamm-Dancoff and Random Phase Approximation models have had a good record in describing collective excitations in nuclear systems. As such they can serve as a basis for several extensions that improve upon it and more accurately describe the system. Such an extension is represented by a density-dependent particle-hole interaction. A previous generalized model uncovered both physical collective states associated with the dipole excitation of the system: Giant Dipole Resonance (GDR) and Pygmy Dipole Resonance (PDR). Here we extend our approach considering three interacting sub-systems. We observe that the system tends to fallback towards the same two collective modes: GDR and PDR while all other states prove to be of a noncollective nature. Accuracy and consistency have been greatly improved up to the point of nearly matching the most recent experimental results.


References:

V. Baran, D. I. Palade, M. Colonna, M. Di Toro, A. Croitoru, A. I. Nicolin, Phys. Rev. C 91, 054303 (2015)