Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coulomb excitation of the $\left|T_z\right|=\frac{1}{2}$, $A=23$ mirror
  pair   Background: Electric-quadrupole ($E2$) strengths relate to the underlying
quadrupole deformation of a nucleus and present a challenge for many nuclear
theories. Mirror nuclei in the vicinity of the line of $N=Z$ represent a
convenient laboratory for testing deficiencies in such models, making use of
the isospin-symmetry of the systems. Purpose: Uncertainties associated with
literature $E2$ strengths in \textsuperscript{23}Mg are some of the largest in
$T_z=\left|\frac{1}{2}\right|$ nuclei in the $sd$-shell. The purpose of the
present work is to improve the precision with which these values are known, to
enable better comparison with theoretical models. Methods: Coulomb-excitation
measurements of $^{23}$Mg and $^{23}$Na were performed at the TRIUMF-ISAC
facility using the TIGRESS spectrometer. They were used to determine the $E2$
matrix elements of mixed $E2$/$M1$ transitions. Results: Reduced $E2$
transition strengths, $B(E2)$, were extracted for \textsuperscript{23}Mg and
\textsuperscript{23}Na. Their precision was improved by factors of
approximately six for both isotopes, while agreeing within uncertainties with
previous measurements. Conclusions: A comparison was made with both shell-model
and {\it ab initio} valence-space in-medium similarity renormalization group
calculations. Valence-space in-medium similarity-renormalization-group
calculations were found to underpredict the absolute $E2$ strength - in
agreement with previous studies.

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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th