Can the PREX-2 and CREX results be understood by relativistic mean-field models with the astrophysical constraints?

Abstract

We construct new effective interactions using the relativistic mean-field models with the isoscalar-and isovector-meson mixing, & sigma;252 and & omega;& mu;& omega;& mu;p & nu;p & nu;. Taking into account the particle flow data in heavy-ion collisions, the observed mass of PSR J0740+6620, and the tidal deformability of a neutron star from the binary merger event, GW170817, we study the ground-state properties of finite, closed-shell nuclei, and try to explain the recent results from the PREX-2 and CREX experiments. It is found that the & sigma;-& delta; mixing is very powerful to understand the terrestrial experiments and astrophysical observations of neutron stars self-consistently. We can predict the large neutron skin thickness of 208Pb, R208 skin = 0.243 fm, using the slope parameter of nuclear symmetry energy, L = 70 MeV, which is consistent with the PREX-2 result. However, to explain the CREX data, it is preferable to adopt the small value of L = 20 MeV. It is very difficult to understand the PREX-2 and CREX results simultaneously within relativistic mean-field models.& COPY; 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.