Speaker
Description
Using the relativistic mean-field model with the isoscalar- and isovector-meson mixing, we consider a new nuclear equation of state, which satisfies the large neutron skin thickness of Pb208 and the small neutron-star radius, respectively reported by the PREX-2 experiment and the NICER observation. We study the effects of scalar-isovector meson and its mixing on the properties of asymmetric-nuclear matter, finite nuclei, and neutron-star matter, focusing on the density dependence of nuclear symmetry energy. It is found that the nuclear symmetry energy becomes soft around twice the nuclear saturation density due to the scalar-meson mixing, and thus, it is possible to explain the PREX-2 data and the astrophysical results from NICER and GW170817 simultaneously. In addition, we discuss the result of the neutron skin thickness of Ca48 from CREX experiment.
