Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hard spheres model of the atom   The finite size effect of electron and nucleus is accounted for in the model
of atom. Due to their hard sphere repulsion the energy of the 1s orbital
decreases and the corrections amount up to 8% in Uranium. Several models for
boundary conditions on the atomic nucleus surface are discussed as well.

22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
16
The categories of this paper are: stat
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
14
The categories of this paper are: math-ph