Constraining the nuclear symmetry energy with PREX-II electroweak form factor data

The difference between the electric and weak charge form factors of heavy nuclei, Δ F_CW=F_C-F_W (where F_C is the charge form factor and F_W is the weak charge form factor), is essentially determined by the density slope parameter of the symmetry energy L_2/3at sub-saturation density ρ2/3≡ 2ρ0/3 (approximately corresponding to the average density of heavy nuclei, and ρ0 is nuclear saturation density). Based on the parity-violating electron elastic scattering experiments, in 2022, the PREX-II (Pb Radius EXperiment-II) collaboration reported a model-independent measurement of the electroweak charge form factor for ^208Pb