Neutron skin thickness from the measured electric dipole polarizability in 68Ni, 120Sn, and 208Pb

Scientific paper - Original scientific paper

• Author: X. Roca-Maza
• Author: X. Vinas
• Author: M. Centelles
• Author: B. K. Agrawal
• Author: G. Colo
• Author: Nils Paar
• Author: J. Piekarewicz
• Author: Dario Vretenar
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

The information on the symmetry energy and its density dependence is deduced by comparing the available data on the electric dipole polarizability αD of 68Ni, 120Sn, and 208Pb with the predictions of the random-phase approximation, using a representative set of nuclear energy density functionals. The calculated values of αD are used to validate different correlations involving αD, the symmetry energy at the saturation density J , the corresponding slope parameter L, and the neutron skin thickness rnp, as suggested by the droplet model. A subset of models that reproduce simultaneously the measured polarizabilities in 68Ni, 120Sn, and 208Pb are employed to predict the values of the symmetry energy parameters at saturation density and rnp. The resulting intervals are J =30–35 MeV, L=20–66 MeV; and the values for rnp in 68Ni, 120Sn, and 208Pb are in the ranges 0.15–0.19, 0.12–0.16, and 0.13–0.19 fm, respectively. The strong correlation between the electric dipole polarizabilities of two nuclei is instrumental to predict the values of electric dipole polarizabilities in other nuclei.

• Keywords (english): neutron skin; electric dipole polarizability; nuclear energy density functional
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C - Nuclear Physics
• Numbering: vol. 92, no. 6, 064304
• p-ISSN: 0556-2813
• e-ISSN: 1089-490X
• DOI: https://doi.org/10.1103/PhysRevC.92.064304
• URN:NBN: urn:nbn:hr:217:320905
• Publication: 2015
• Project: Number: IP-2014-09-9159; Title (croatian): Struktura i dinamika egzotičnih femto-sustava; Acronym: STRUDEF; Leader: Nils Paar; Jurisdiction: Croatia; Funding stream: IP
• Document URL: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.92.064304
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2015) by the American Physical Society. Received 7 October 2015; published 8 December 2015.
• Created on: 2020-01-23 16:57:04