Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Last Hope for an astrophysical solution to the solar neutrino problem   We discuss what appears the last hope for an astrophysical solution to the
solar neutrino problem: a correlated variation of the astrophysical factors for
the helium burning cross sections ($S_{33}$ and $S_{34}$) and either $S_{17}$
or the central temperature $T_c$. In this context, we recognize the important
role played by the CNO neutrinos. In fact, we can obtain a fair fit to the
experimental data only if three conditions are met simultaneously: the
astrophysical factor $S_{33}$ is about 200 times what is presently estimated,
the astrophysical factor $S_{17}$ is about 3 times larger and the $^{13}$N and
$^{15}$O neutrino fluxes are negligible compared to the ones predicted by
standard solar models. These conditions are not supported by the present data
and their correlated combination is improbable.

17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph