Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Seasonal and Lunar month periods observed in natural neutron flux at
  high altitude   Air radon concentration measurement is useful for research on geophysical
effects, but it is strongly sensitive to site geology and many geophysical and
microclimatic processes such as wind, ventilation, air humidity and so on that
induce very big fluctuations on the concentration of radon in air. On the
contrary, monitoring the radon concentration in soil by measuring the thermal
neutron flux reduces environmental effects. In this paper we report some
experimental results on the natural thermal neutron flux as well as the
concentration of air radon and its variations at 4300 m a.s.l. These results
were obtained with unshielded thermal neutron scintillation detectors
(en-detectors) and radon monitors located inside the ARGO-YBJ experimental
hall. The correlation of these variations with the lunar month and 1-year
period is undoubtedly confirmed. A method for earthquakes prediction provided
by a global net of the en-detectors is currently under study.

27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom