Constraining the relativistic mean-field models from PREX-2 data: Effective forces revisited

Abstract

Based on the current measurement of the neutron distribution radius (R n ) of 208 Pb through the PREX-2 data, we re-visited the recently developed G3 and IOPB-I force parameter by fine-tuning some of the specific couplings within the relativistic mean-field model. The ω − ρ−mesons coupling Λ ω and the ρ−meson coupling g ρ are refitted to reproduce the experimental neutron radius of 208 Pb without compromising the bulk properties of finite nuclei and infinite nuclear matter observables. The modified parameter sets are applied to calculate the gross properties of finite nuclei for a few double closed-shell nuclei and further used to obtain the various infinite nuclear matter observables at saturation. In addition to these, the force parameters are adopted to calculate the properties of high isospin asymmetry dense system such as neutron star matter and tested for the validation for the constraint from GW170817 binary neutron star merger events. The tuned forces are predicting relatively good results for finite and infinite nuclear matter systems and the current limitation on neutron radius from PREX-2. A systematic analysis using these two refitted parameter sets over the nuclear chat will be communicated shortly.

Constraining nuclear matter parameters and neutron star observables using PREX-2 and NICER data

“…Recently, the updated Lead Radius Experiment (PREX) has given the neutron skin thickness of 208 Pb as R skin = 0.283 ± 0.071 fm [38]. Based on this data Patnaik et al [41] tuned the G3 and IOPB-I parameter sets. The impacts of PREX-2 data on the NM and NS properties have been explicitly studied in the Ref.…”