Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decay properties of $^{22}\mathrm{Ne} + \alpha$ resonances and their
  impact on $s$-process nucleosynthesis   The astrophysical $s$-process is one of the two main processes forming
elements heavier than iron. A key outstanding uncertainty surrounding
$s$-process nucleosynthesis is the neutron flux generated by the
${}^{22}\mathrm{Ne}(\alpha, n){}^{25}\mathrm{Mg}$ reaction during the He-core
and C-shell burning phases of massive stars. This reaction, as well as the
competing ${}^{22}\mathrm{Ne}(\alpha, \gamma){}^{26}\mathrm{Mg}$ reaction, is
not well constrained in the important temperature regime from ${\sim}
0.2$--$0.4$~GK, owing to uncertainties in the nuclear properties of resonances
lying within the Gamow window. To address these uncertainties, we have
performed a new measurement of the ${}^{22}\mathrm{Ne}({}^{6}\mathrm{Li},
d){}^{26}\mathrm{Mg}$ reaction in inverse kinematics, detecting the outgoing
deuterons and ${}^{25,26}\mathrm{Mg}$ recoils in coincidence. We have
established a new $n / \gamma$ decay branching ratio of $1.14(26)$ for the key
$E_x = 11.32$ MeV resonance in $^{26}\mathrm{Mg}$, which results in a new
$(\alpha, n)$ strength for this resonance of $42(11)~\mu$eV when combined with
the well-established $(\alpha, \gamma)$ strength of this resonance. We have
also determined new upper limits on the $\alpha$ partial widths of
neutron-unbound resonances at $E_x = 11.112,$ $11.163$, $11.169$, and $11.171$
MeV. Monte-Carlo calculations of the stellar ${}^{22}\mathrm{Ne}(\alpha,
n){}^{25}\mathrm{Mg}$ and ${}^{22}\mathrm{Ne}(\alpha,
\gamma){}^{26}\mathrm{Mg}$ rates, which incorporate these results, indicate
that both rates are substantially lower than previously thought in the
temperature range from ${\sim} 0.2$--$0.4$~GK.

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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin