Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective mass splitting of neutron and proton and isospin emission in
  heavy-ion collisions   Within the framework of an isospin and momentum dependent transport model,
the emissions of isospin particles (nucleons and light clusters) squeezed out
in heavy-ion collisions are investigated as probes of the poorly known symmetry
energy at high baryon density. Two different mass splittings of neutrons and
protons in nuclear medium as $m_{n}^{\ast}>m_{p}^{\ast}$ and
$m_{n}^{\ast}<m_{p}^{\ast}$ are used in the model and their influence on the
isospin emission in heavy-ion collisions is discussed thoroughly. The
competition between the stiffness and the momentum dependence of the symmetry
potential on reaction dynamics are compared and systematically analyzed. It is
found that the difference of the neutron and proton directed flows and the
transverse momentum distribution of the neutron/proton ratio are sensitive to
the stiffness of the symmetry energy, which can not be changed with the
controversial effective mass splitting. The elliptic flows of free nucleons at
high transverse momentum within mid-rapidity emission are a promising
observable as distinguishing the nucleon effective mass splitting.

1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex