Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: STACEX: RPC-based detector for a multi-messenger observatory in the
  Southern Hemisphere   Recent findings by the LHAASO experiment are opening a new window, that of
the PeV sky, to the observation of the electromagnetic spectrum. Several
astronomical objects emitting gamma-rays at energies well above 100 TeV have
been observed with the LHAASO-KM2 array of scintillators and muon detectors,
clearly demonstrating the feasibility of gamma-ray astronomy up to PeV
energies. An all-sky gamma-ray detector in the Southern Hemisphere, operating
in the GeV-PeV range, could complement LHAASO observations, monitor the Inner
Galaxy and the Galactic Center looking for PeVatrons. As shown by LHAASO, a
water-Cherenkov based detector is not well suited to measure the energy
spectrum up to the PeV range, nor to reach the advisable 100 GeV threshold. The
ARGO-YBJ experiment, operated for many years at 4300 m a.s.l. with an energy
threshold of about 300 GeV, demonstrated, on the contrary, the capability of a
carpet of Resistive Plate Chambers (RPCs) to fully reconstruct showers starting
from the GeV range up to about 10 PeV. In this contribution we propose a hybrid
detector made of a layer of RPCs on top of a water Cherenkov facility devoted
to the detection of muons for the selection of gamma-induced showers by the
muon-poor technique. We present the layout and discuss the expected
performance.

29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph