Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bose-Einstein condensate of alpha particles in the ground state of
  nuclear matter?   The phase diagram of isospin-symmetric chemically equilibrated mixture of
alpha particles and nucleons is studied in the mean-field approximation.
Skyrme-like parametrization is used for the mean-field potentials as functions
of partial densities of nucleons and alphas. We find that there is a threshold
value a* of the parameter a(N-alpha) which describes the attractive interaction
between alpha-particles and nucleons. At a(N-alpha)<a* the ground state of
nuclear matter at zero temperature behaves as a pure system of interacting
nucleons, whereas at a(N-alpha)>a* the nuclear ground state includes also a
nonzero fraction of alphas. We demonstrate that the equation of state of such
alpha-N system includes both the first-order liquid-gas phase transitions and
the Bose-Einstein condensation of alpha particles.

29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc