Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Can the nuclear symmetry potential at supra-saturation densities be
  negative?   In the framework of an Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU)
transport model, for the central $^{197}$Au+$^{197}$Au reaction at an incident
beam energy of 400 MeV/nucleon, effect of nuclear symmetry potential at
supra-saturation densities on the pre-equilibrium clusters emission is studied.
It is found that for the positive symmetry potential at supra-saturation
densities the neutron to proton ratio of lighter clusters with mass number
$A\leq3$ ($(n/p)_{A\leq3}$) is larger than that of the weighter clusters with
mass number $A>3$ ($(n/p)_{A>3}$), whereas for the negative symmetry potential
at supra-saturation densities the $(n/p)_{A\leq3}$ is \emph{smaller} than that
of the $(n/p)_{A>3}$. This may be considered as a probe of the negative
symmetry potential at supra-saturation densities.

27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph