Sensitivity of neutron radii in a208Pb nucleus and a neutron star to nucleon-σ-ρ coupling corrections in relativistic mean field theory

Journal article

Authors/Editors

Gregory, Hillhouse

Research Areas

ENGINEERING AND TECHNOLOGY (Frascati classification)

Publication Details

Subtitle: Sensitivity of neutron radii in a208Pb nucleus and a neutron star to nucleon-σ-ρ coupling corrections in relativistic mean field theory

Author list: Gregory, Hillhouse

Publisher: Elsevier

Publication year: 2005

Journal: Nuclear Physics B - Proceedings Supplements (0920-5632)

Volume number: 71

Issue number: 4

Start page: 1

End page: 10

Number of pages: 10

ISSN: 0920-5632

Languages: English-United States (EN-US)

Abstract

We study the sensitivity of the neutron skin thickness S in a 208Pb nucleus to the addition of nucleon-σ-ρ coupling corrections to a selection (PK1, NL3, S271, and Z271) of interactions in a relativistic mean field model. The PK1 and NL3 effective interactions lead to a minimum value of S= 0.16 fm in comparison with the original value of S= 0.28 fm. The S271 and Z271 effective interactions yield even smaller values of S= 0.11 fm, which are similar to those for nonrelativistic mean field models. A precise measurement of the neutron radius, and therefore S, in 208Pb will place an important constraint on both relativistic and nonrelativistic mean field models. We also study the correlation between the radius of a 1.4-solar-mass neutron star and S.

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