Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Backscattering of MeV Electrons. An Analysis of Tabata's Experiment with
  Geant4   A series of simulations were conducted with Geant4 in order to verify the
electron backscattering experiments performed by Tabata in the low Z elements
of Be, C, and Al. In general, quite good agreement was obtained by carefully
choosing the physics lists employed. These results invalidate the claim made
before about the presence of experimental errors in the above work.

2
The categories of this paper are: math
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex