Pygmy dipole resonances in relativistic random phase approximation

Znanstveni rad - Izvorni znanstveni rad

• Autor: Dario Vretenar
• Autor: Nils Paar
• Autor: Peter Ring
• Autor: G. A. Lalazissis
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

The isovector dipole response in 208Pb is described in the framework of a fully self-consistent relativistic random phase approximation. The NL3 parameter set for the effective mean-field Lagrangian with nonlinear meson self-interaction terms, used in the present calculations, reproduces ground state properties as well as the excitation energies of giant resonances in nuclei. In addition to the isovector dipole resonance in $^{208}$Pb, the present analysis predicts the occurrence of low-lying E1 peaks in the energy region between 7 and 11 MeV. In particular, a collective state has been identified whose dynamics correspond to that of a dipole pygmy resonance: the vibration of the excess neutrons against the inert core composed of equal number of protons and neutrons.

• Ključne riječi (engleski): isovector dipole resonances; relativistic random phase approximation
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical Review C - Nuclear Physics
• Brojčani podaci: vol. 63, br. 4, str. 47301-4
• p-ISSN: 0556-2813
• e-ISSN: 1089-490X
• DOI: https://doi.org/10.1103/PhysRevC.63.047301
• URN:NBN: urn:nbn:hr:217:771482
• Datum objave publikacije: 2001
• URL dokumenta: http://link.aps.org/doi/10.1103/PhysRevC.63.047301
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: Copyright (2001) by the American Physical Society.
• Datum i vrijeme pohrane: 2019-10-11 15:03:38