Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transport model study of nuclear stopping in heavy ion collisions over
  an energy range from 0.09A GeV to 160A GeV   Nuclear stopping in the heavy ion collisions over a beam energy range from
SIS, AGS up to SPS is studied in the framework of the modified UrQMD transport
model, in which mean field potentials of both formed and "pre-formed" hadrons
(from string fragmentation) and medium modified nucleon-nucleon elastic cross
sections are considered. It is found that the nuclear stopping is influenced by
both the stiffness of the equation of state and the medium modifications of
nucleon-nucleon cross sections at SIS energies. At the high SPS energies, the
two-bump structure is shown in the experimental rapidity distribution of free
protons, which can be understood with the consideration of the "pre-formed"
hadron potentials.

3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin