Electric dipole polarizability in 208Pb: Insights from the droplet model

Scientific paper - Original scientific paper

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

Abstract (english)

We study the electric dipole polarizability αD in 208Pb based on the predictions of a large and representative set of relativistic and nonrelativistic nuclear mean-field models. We adopt the droplet model as a guide to better understand the correlations between αD and other isovector observables. Insights from the droplet model suggest that the product of αD and the nuclear symmetry energy at saturation density J is much better correlated with the neutron skin thickness Δrnp of 208Pb than the polarizability alone. Correlations of αDJ with Δrnp and with the symmetry energy slope parameter L suggest that αDJ is a strong isovector indicator. Hence, we explore the possibility of constraining the isovector sector of the nuclear energy density functional by comparing our theoretical predictions against measurements of both αD and the parity-violating asymmetry in 208Pb. We find that the recent experimental determination of αD in 208Pb in combination with the range for the symmetry energy at saturation density J=[31±(2)est] MeV suggests Δrnp(208Pb)=0.165±(0.009)expt±(0.013)theor±(0.021)est fm and L=43±(6)expt±(8)theor±(12)est MeV.

• Keywords (english): electric dipole polarizability; liquid drop model; symmetry energy
• 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. 88, no. 2, 024316
• p-ISSN: 0556-2813
• e-ISSN: 1089-490X
• DOI: https://doi.org/10.1103/PhysRevC.88.024316
• URN:NBN: urn:nbn:hr:217:396802
• Publication: 2013
• Project: Number: 119-1191005-1010; Title (croatian): Nuklearna struktura i nuklearna astrofizika; Leader: Dario Vretenar; Jurisdiction: Croatia; Funding stream: ZP
• Document URL: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.88.024316
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2013) by the American Physical Society. Received 17 July 2013; published 20 August 2013.
• Created on: 2019-11-26 16:49:15