Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The MACRO Experiment at Gran Sasso   In this overview of the MACRO experiment we recall the structure of the
detector and discuss several physics topics: atmospheric neutrinos and neutrino
oscillations, high energy neutrino astronomy, searches for WIMPs and for low
energy stellar gravitational collapse neutrinos, stringent upper limits on GUT
magnetic monopoles, high energy downgoing muons, primary cosmic ray composition
and shadowing of primary cosmic rays by the Moon and the Sun.

34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg