Implications of PREX-2+CREX Experiments on the Equation of State of Dense Matter

The recent CREX parity-violating electron scattering experiment has reported a small value for the form factor skin F_c-F_w in ⁴⁸Ca. This result is rather unexpected as the implied value for the neutron skin R_n-R_p is also small. In contrast, the PREX-2 experiment reported a moderately large neutron skin in ²⁰⁸Pb. The combined result of both experiments shows that there are currently no models in literature which reproduce simultaneously both experimental results at the 68% level. This has important implications for our understanding of the isovector sector of the equation of state and on the calibration and optimization of model energy density functionals. The connection to neutron stars will also be discussed.