Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Has a thick neutron skin in ${}^{208}$Pb been ruled out?   The Lead Radius Experiment (PREX) has provided the first model-independent
evidence in favor of a neutron-rich skin in ${}^{208}$Pb. Although the error
bars are large, the reported large central value of 0.33\,fm is particularly
intriguing. To test whether such a thick neutron-skin in ${}^{208}$Pb is
already incompatible with laboratory experiments or astrophysical observations,
we employ relativistic models with neutron-skin thickness in ${}^{208}$Pb
ranging from 0.16 to 0.33 fm to compute ground state properties of finite
nuclei, their collective monopole and dipole response, and mass-{\sl vs}-radius
relations for neutron stars. No compelling reason was found to rule out models
with large neutron skins in ${}^{208}$Pb from the set of observables considered
in this work.

29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat