Coulomb excitation of the $|T_z|=12, A=23$ mirror pair

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  • J. Henderson
    University of Surrey
  • G. Hackman
    TRIUMF
  • P. Ruotsalainen
    Jyväskylä University
  • J. D. Holt
    TRIUMF
  • S. R. Stroberg
    TRIUMF
  • C. Andreoiu
    Simon Fraser University
  • G. C. Ball
    TRIUMF
  • N. Bernier
    TRIUMF
  • M. Bowry
    TRIUMF
  • R. Caballero-Folch
    TRIUMF
  • S. Cruz
    TRIUMF
  • A. Diaz Varela
    University of Guelph, Ontario
  • L. J. Evitts
    TRIUMF
  • R. Frederick
    TRIUMF
  • A. B. Garnsworthy
    TRIUMF
  • M. Holl
    Saint Mary’s University, Halifax, Vova Scotia
  • J. Lassen
    TRIUMF
  • J. Measures
    TRIUMF
  • B. Olaizola
    TRIUMF
  • E. O'Sullivan
    TRIUMF
  • O. Paetkau
    TRIUMF
  • J. Park
    TRIUMF
  • J. Smallcombe
    TRIUMF
  • C. E. Svensson
    University of Guelph, Ontario
  • K. Whitmore
    Simon Fraser University
  • C. Y. Wu
    Lawrence Livermore National Library, CA
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=∣∣12∣∣ 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
JournalPhysical Review C
Volume105
Issue number3
DOIs
Publication statusPublished - 28 Mar 2022

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