Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure of Pairs in Heavy Weakly-Bound Nuclei   We study the structure of nucleon pairs within a simple model consisting of a
square well in three dimensions and a delta-function residual interaction
between two weakly-bound particles at the Fermi surface. We include the
continuum by enclosing the entire system in a large spherical box. To a good
approximation, the continuum can be replaced by a small set of
optimally-determined resonance states, suggesting that in many nuclei far from
stability it may be possible to incorporate continuum effects within
traditional shell-model based approximations.

16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol