Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-structures of N-boson systems with nonzero spins - an analytically
  solvable model with pairing force   A model is proposed to study the possible pairing structures of N-boson
systems with nonzero spin. Analytical solutions have been obtained. The
emphasis is placed on the spin-structures of ground states with attractive or
repulsive pairing force, and with or without the action of a magnetic field. A
quantity (an analogue of the two-body density function) is defined to study the
spin-correlation between two bosons in N-body systems. The excitation of the
system has also been studied.

10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph