Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quark Degrees of Freedom in Finite Nuclei   Properties of finite nuclei are investigated based on relativistic Hartree
equations which have been derived from a relativistic quark model of the
structure of bound nucleons. Nucleons are assumed to interact through the
(self-consistent) exchange of scalar ($\sigma$) and vector ($\omega$ and
$\rho$) mesons at the quark level. The coupling constants and the mass of the
$\sigma$-meson are determined from the properties of symmetric nuclear matter
and the rms charge radius in $^{40}$Ca. Calculated properties of static,
closed-shell nuclei, as well as symmetric nuclear matter are compared with
experimental data and with the results of Quantum Hadrodynamics (QHD).

18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex