Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Systematics of central heavy ion collisions in the 1A GeV regime   Using the large acceptance apparatus FOPI, we study central collisions in the
reactions (energies in A GeV are given in parentheses): 40Ca+40Ca (0.4, 0.6,
0.8, 1.0, 1.5, 1.93), 58Ni+58Ni (0.15, 0.25, 0.4), 96Ru+96Ru (0.4, 1.0, 1.5),
96Zr+96Zr (0.4, 1.0, 1.5), 129Xe+CsI (0.15, 0.25, 0.4), 197Au+197Au (0.09,
0.12, 0.15, 0.25, 0.4, 0.6, 0.8, 1.0, 1.2, 1.5). The observables include
cluster multiplicities, longitudinal and transverse rapidity distributions and
stopping, and radial flow. The data are compared to earlier data where possible
and to transport model simulations.

25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex