Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hydrogen portal to exotic radioactivity   We show that in a special class of dark sector models, the hydrogen atom can
serve as a portal to new physics, through its decay occurring in abundant
populations in the Sun and on Earth. The large fluxes of hydrogen decay
daughter states can be detected via their decay or scattering. By constructing
two models for either detection channel, we show that the recently reported
excess in electron recoils at XENON1T could be explained by such signals in
large regions of parameter space unconstrained by proton and hydrogen decay
limits.

28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph