Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrino Magnetic Moment Model and Solar Neutrino Problem   We examine the time variation problem of solar neutrinos in the spin-flavour
precession mechanism taking into account the $\nu_e$-$\nu_{\mu}$ mixing. The
models with the small and large mixing angle are studied. It shows that the
models which realize $m_{\nu_e\nu_e} \sim m_{\nu_{\mu}\nu_{\mu}} \ll
m_{\nu_e\nu_{\mu}}$ and $m_{\nu_e\nu_e} \sim m_{\nu_{\mu}\nu_{\mu}} {^>_\sim}
m_{\nu_e\nu_{\mu}}$ seem to have preferable time variation features. It is very
interesting that the former type of models can give the large magnetic moment
to neutrinos and also suppress the radiative mass correction naturally.

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The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th