Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon distribution in nuclei beyond \beta-stability line   The radii of nucleon distribution, bulk density, and neutron skin in nuclei
beyond the \beta-stability line are studied within the direct variational
method. We evaluate the partial equation of state of finite nuclei and
demonstrate that the bulk density decreases beyond the beta stability line. We
show that the growth of the neutron skin in unstable nuclei does not obey the
saturation condition because of the polarization effect. The value of the
neutron-skin thickness \Delta r_{np}=\sqrt{<r_n^2>}-\sqrt{<r_p^2>} is caused by
the different radii (skin effect) and only slightly by the different shapes
(halo effect) of neutron and proton distributions. The relative contribution of
both effects depends on the competition between the symmetry energy, and the
spin-orbit and Coulomb interactions. The calculations of the isovector shift of
the nuclear radius \Delta r_{np} show its primarily linear dependence on the
asymmetry parameter X=(N-Z)/A.

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The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org