Coulomb excitation of the |<i>T<sub>z</sub></i>|=1/2, A=23 mirror pair



Henderson, J, Hackman, G, Ruotsalainen, P, Holt, JD, Stroberg, SR, Andreoiu, C, Ball, GC, Bernier, N, Bowry, M, Caballero-Folch, R
et al (show 16 more authors) (2022) Coulomb excitation of the |<i>T<sub>z</sub></i>|=1/2, A=23 mirror pair. PHYSICAL REVIEW C, 105 (3). 034332-.

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: nucl-ex, nucl-ex, nucl-th
Depositing User: Symplectic Admin
Date Deposited: 12 Oct 2020 10:03
Last Modified: 12 Oct 2023 18:55
DOI: 10.1103/PhysRevC.105.034332
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3104038