Characterizing the nuclear models informed by PREX and CREX: a view from Bayesian inference
arxiv(2024)
Abstract
New measurements of the weak charge density distributions of ^48Ca and
^208Pb challenge existing nuclear models. In the post-PREX-CREX era, it is
unclear if current models can simultaneously describe weak charge distributions
along with accurate measurements of binding energy and charge radii. In this
letter, we explore the parameter space of relativistic and non-relativistic
models to study the differences between the form factors of the electric and
weak charge distributions, Δ F=F_ch-F_w, in ^48Ca and
^208Pb. We show, for the first time, the parts of the mean-field models
that are the most important in determining the relative magnitude of the
neutron skin in lead and calcium nuclei. We carefully disentangle the tension
between the PREX/CREX constraints and the ability of the RMF and Skyrme models
to accurately describe binding energies and charge radii. We find that the
nuclear symmetry energy coefficient S_V and the isovector spin-orbit
coefficient b'_4 play different roles in determining Δ F of ^48Ca
and ^208Pb. Consequently, adjusting S_V or b'_4 shifts
predicted Δ F values toward or away from PREX/CREX measurements.
Additionally, S_V and the slope L are marginally correlated given
the constraints of our Bayesian inference, allowing us to infer them separately
from PREX and CREX data.
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