Coulomb excitation of the ΙTzΙ=½, A=23 mirror pair

J. Henderson*, G. Hackman, P. Ruotsalainen, J. D. Holt, S. R. Stroberg, C. Andreoiu, G. C. Ball, N. Bernier, M. Bowry, R. Caballero-Folch, S. Cruz, A. Diaz Varela, L. J. Evitts, R. Frederick, A. B. Garnsworthy, M. Holl, J. Lassen, J. Measures, B. Olaizola, E. O'SullivanO. Paetkau, J. Park, J. Smallcombe, C. E. Svensson, K. Whitmore, C. Y. Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 23Mg are some of the largest in Tz = ∣ ½ ∣ nuclei in the sd shell. The purpose of the present paper is to improve the precision with which these values are known, to enable better comparison with theoretical models.

Methods: Coulomb-excitation measurements of 23Mg and 23Na 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 23Mg and 23Na . Their precision was improved by factors of approximately 6 for both isotopes, while agreeing within uncertainties with previous measurements.

Conclusions: A comparison was made with both shell-model and 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.
Original languageEnglish
Article number034332
JournalPhysical Review C
Volume105
Issue number3
DOIs
Publication statusPublished - 28 Mar 2022
Externally publishedYes

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