Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The solar core: new low-l p-mode fine-spacing results from BiSON   The fine-structure spacing $d_{\ell}(n) = \nu_{\ell,n} - \nu_{\ell+2,n-1}$
for low-degree solar p modes of angular degree $\ell$ and radial order n, is
sensitive to conditions in the deep radiative interior of the Sun. Here, we
present fine-structure spacings derived from the analysis of nearly five years
of helioseismological data collected between 1991 July and 1996 February by the
Birmingham Solar-Oscillations Network (BiSON). These data cover $9 \le n \le
28$ for $d_{0}(n)$, and $11 \le n \le 27$ for $d_{1}(n)$. The measured spacings
are much more precise, and cover a greater range, than earlier measurements
from BiSON data (Elsworth et al. 1990a). The predicted fine-structure spacings
for a ``standard'' solar model are clearly excluded by the BiSON data (at
$\approx 10\sigma$); models that include helium and heavy element settling
provide a much better match to the observed spacings (see also Elsworth et al.
1995). Since the inclusion of core settling in solar models will tend to
slightly increase the predicted neutrino flux, the BiSON fine-structure data
appear to reinforce previous conclusions, i.e., an astrophysical solution to
the solar neutrino problem seems unlikely.

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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: math
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int