Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct capture cross section and the $E_p$ = 71 and 105 keV resonances
  in the $^{22}$Ne($p,\gamma$)$^{23}$Na reaction   The $^{22}$Ne($p,\gamma$)$^{23}$Na reaction, part of the neon-sodium cycle of
hydrogen burning, may explain the observed anticorrelation between sodium and
oxygen abundances in globular cluster stars. Its rate is controlled by a number
of low-energy resonances and a slowly varying non-resonant component. Three new
resonances at $E_p$ = 156.2, 189.5, and 259.7 keV have recently been observed
and confirmed. However, significant uncertainty on the reaction rate remains
due to the non-resonant process and to two suggested resonances at $E_p$ = 71
and 105 keV. Here, new $^{22}$Ne($p,\gamma$)$^{23}$Na data with high statistics
and low background are reported. Stringent upper limits of 6$\times$10$^{-11}$
and 7$\times$10$^{-11}$\,eV (90\% confidence level), respectively, are placed
on the two suggested resonances. In addition, the off-resonant S-factor has
been measured at unprecedented low energy, constraining the contributions from
a subthreshold resonance and the direct capture process. As a result, at a
temperature of 0.1 GK the error bar of the $^{22}$Ne($p,\gamma$)$^{23}$Na rate
is now reduced by three orders of magnitude.

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The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph