Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutron-Proton Radii in N \approx Z Nuclei   A simple formula is derived that describes how the Coulomb interaction
affects the proton radius in nuclei. It determines the difference between
neutron and proton radii in nuclei with N approx Z. It also provides an
estimate for the difference between the radii of the Z core neutrons and the
protons in nuclei with a large neutron excess. The results obtained from the
derived formula are compared with radii calculated in a Skyrme Hartree-Fock
calculation.

11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc