Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectra of Cosmic Ray Sodium and Aluminum and Unexpected Aluminum Excess   Since its launch, the Alpha Magnetic Spectrometer-02 (AMS-02) has delivered
outstanding quality measurements of the spectra of cosmic-ray (CR) species,
$\bar{p}$, $e^{\pm}$, and nuclei (H-Si, Fe), which resulted in a number of
breakthroughs. The most recent AMS-02 result is the measurement of the spectra
of CR sodium and aluminum up to $\sim$2 TV. Given their low solar system
abundances, a significant fraction of each element is produced in
fragmentations of heavier species, predominantly Ne, Mg, and Si. In this paper,
we use precise measurements of the sodium and aluminum spectra by AMS-02
together with ACE-CRIS and Voyager 1 data to test their origin. We show that
the sodium spectrum agrees well with the predictions made with the
GalProp-HelMod framework, while aluminum spectrum shows a significant excess in
the rigidity range from 2-7 GV. In this context, we discuss the origin of other
low-energy excesses in Li, F, and Fe found earlier. The observed excesses in
Li, F, and Al appear to be consistent with the local Wolf-Rayet (WR) stars
hypothesis, invoked to reproduce anomalous $^{22}$Ne/$^{20}$Ne,
$^{12}$C/$^{16}$O, and $^{58}$Fe/$^{56}$Fe ratios in CRs, while excess in Fe is
likely connected with a past SN activity in the solar neighborhood. We also
provide updated local interstellar spectra (LIS) of sodium and aluminum in the
rigidity range from few MV to $\sim$2 TV. Our calculations employ the
self-consistent GalProp-HelMod framework that has proved to be a reliable tool
in deriving the LIS of CR $\bar{p}$, $e^{-}$, and nuclei $Z\le28$.

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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph