The nuclear symmetry energy and the neutron skin thickness in nuclei

Abstract

We investigate possible correlations between the stiffness of the symmetry energy at saturation density, the so-called $L$ parameter, and the neutron skin thickness of ${}^{48}$Ca and ${}^{208}$Pb, for which the recent measurements from the CREX and PREX I+II experiments at the Thomas Jefferson Laboratory became available. We choose an ensemble of nucleonic equations of state (EoS) derived within microscopic (BHF, Variational, AFDMC) and phenomenological (Skyrme, RMF, DD-RMF) approaches. They are all compatible with the laboratory nuclear collisions data and with current observations of neutron stars (NS) mass and the tidal polarizability of a 1.4 $M_{\odot }$ NS, as deduced from the GW170817 event. We find some degree of correlation between the $L$ parameter and the neutron skin thickness whereas a much weaker correlation does exist with the tidal polarizability and the symmetry energy at saturation density. However, some EoS which are able to explain the CREX experimental data, are not compatible with the PREX I+II data, and viceversa. We confirm the results previously obtained with a different set of EoS models, and find a possible tension between the experimental data and the current understanding of the nuclear EoS.

16 pages, 4 figures, invited paper to the Research Topic "Strong and Weak Interactions in Compact Stars", to be published in Frontiers in Astronomy and Space Sciences. Edited by A. Sedrakian, M. Alford, D. Blaschke, I. Bombaci, and J. Lattimer

References in corpus (31)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
• Tidal Love numbers of neutron stars
• Constraining neutron star tidal Love numbers with gravitational wave detectors
• Accurate Determination of the Neutron Skin Thickness of ${}^{208}$Pb through Parity-Violation in Electron Scattering
• Nuclear symmetry energy probed by neutron skin thickness of nuclei
• PSR J0952-0607: The Fastest and Heaviest Known Galactic Neutron Star
• GW170817: Joint Constraint on the Neutron Star Equation of State from Multimessenger Observations
• The Skyrme Interaction in finite nuclei and nuclear matter
• Constraints on the symmetry energy and on neutron skins from the pygmy resonances in 68Ni and 132Sn
• Precision Determination of the Neutral Weak Form Factor of ${}^{48}$Ca
• Neutron Stars and the Nuclear Equation of State
• Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density
• Symmetry energy from elliptic flow in 197Au + 197Au
• Density dependence of the nuclear symmetry energy: a microscopic perspective
• GW190814: Impact of a 2.6 solar mass neutron star on nucleonic equations of state
• Astrophysical Constraints on the Symmetry Energy and the Neutron Skin of ${}^{208}$Pb with Minimal Modeling Assumptions
• Constraints on Nuclear Symmetry Energy Parameters
• Non-rotating and rotating neutron stars in the extended field theoretical model
• Determination of the Equation of State from Nuclear Experiments and Neutron Star Observations
• Effects of $\omega$ meson self-coupling on the properties of finite nuclei and neutron stars
• Investigating Dark Matter-Admixed Neutron Stars with NITR Equation of State in Light of PSR J0952-0607
• Unified neutron star EOSs and neutron star structures in RMF models
• Low Densities Instability of Relativistic Mean Field Models
• Nuclear Matter from Effective Quark-Quark Interaction
• BigApple force and its implications to finite nuclei and astrophysical objects
• Studies of the equation-of-state of nuclear matter by heavy-ion collisions at intermediate energy in the multi-messenger era
• Perturbation Theory of Nuclear Matter with a Microscopic Effective Interaction

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• Neutron Decay Anomaly and Its Effects on Neutron Star Properties
• Influence of the effective mass on the properties of nuclear matter at finite density and temperature
• Confronting recent light compact star observations with color-flavor locked quark matter
• Examining the possibility of a thick crust in the compact stellar object HESS J1731-347