Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Normal Collisions of Spheres: A Literature Survey on Available
  Experiments   The central collision between two solid spheres or the normal collision
between a sphere and a plate are important to understand in detail before
studying more complex particle interactions. Models exist to describe this
basic problem but are not always consistent with available experiments. An
interesting benchmark to compare models and experiments is the relation between
the normal coefficient of restitution e and the incident velocity v. In order
to draw a broad comparison between experiments and models (Krijt, S.,
G\"uttler, C., Hei{\ss}elmann, D., Tielens, A.G.G.M., Dominik, C., Energy
dissipation in head-on collisions of spheres, submitted), we provide in this
article an overview on the literature describing experiments on normal
collisions, preferably providing data on e(v). We will briefly summarize our
expectation on this relation according to an established collision model in
order to classify these experiments. We will then provide an overview on
experimental techniques, which we found in the summarized articles, as well as
a listing of all experiments along with a description of the main features of
these. The raw data on e(v) of the listed experiments were digitized and are
provided with this article.

27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio