Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure of $^{23}$Al from a multi-channel algebraic scattering model
  based on mirror symmetry   The proton-rich nucleus $^{23}$Al has a ground state just 123 keV below the
proton drip-line, and as a result comparatively little is known experimentally
about its properties, as with many such nuclei. Theoretical investigations have
tended to model exclusively the ground and first one to three excited states
known. In this paper, we theoretically model most of the known spectrum, and
predict what states may as yet be unobserved. We use the multichannel algebraic
scattering (MCAS) method to describe states as resonances of a valence proton
coupled to a $^{22}$Mg rotor core. Six states with low-excitation energies and
defined $J^\pi$ are matched, and we make the first prediction of the properties
of four others and propound the possible existence of several more.

20
The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
1
The categories of this paper are: cs
3
The categories of this paper are: physics
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The categories of this paper are: stat
19
The categories of this paper are: eess
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci