Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-pixel Geiger-mode avalanche photodiode and wavelength shifting
  fibre readout of plastic scintillator counters of the EMMA underground
  experiment   The results of a development of a scintillator counter with wavelength
shifting (WLS) fibre and a multi-pixel Geiger-mode avalanche photodiode readout
are presented. The photodiode has a metal-resistor-semiconductor layered
structure and operates in the limited Geiger mode. The scintillator counter has
been developed for the EMMA underground cosmic ray experiment.

30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess