Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Central Temperature of the Sun can be Measured via the $^7$Be Solar
  Neutrino Line   A precise test of the theory of stellar evolution can be performed by
measuring the difference in average energy between the neutrino line produced
by ${\rm ^7Be}$ electron capture in the solar interior and the corresponding
neutrino line produced in a terrestrial laboratory. The high temperatures in
the center of the sun broaden the line asymmetrically, FWHM = 1.6~keV, and
cause an average energy shift of 1.3~keV. The width of the $^7$Be neutrino line
should be taken into account in calculations of vacuum neutrino oscillations.

17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph