Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-Megaton Water Cherenkov Detector for a Proton Decay Search --
  TITAND   In this report, we will show a detector which can be used to search for
proton decay in the lifetime region beyond 10$^{35}$ years.
  We will briefly review the current experimental status and discuss the
sensitivity of the future proton decay detectors, and we specifically present a
possibility of a scalable multi-megaton water Cherenkov detector immersed in
the shallow water.

28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics