Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of a Large NaI(Tl) Crystal   Using a narrow band positron beam, the response of a large high-resolution
NaI(Tl) crystal to an incident positron beam was measured. It was found that
nuclear interactions cause the appearance of additional peaks in the low energy
tail of the deposited energy spectrum.

19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio