Coulomb excitation of the vertical bar T-z vertical bar=1/2, A=23 mirror pair
Journal article, 2022
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 Mg-23 are some of the largest in T-z = vertical bar 1/2 vertical bar 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 Mg-23 and Na-23 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 Mg-23 and Na-23. 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.
Author
J. Henderson
TRIUMF
University of Surrey
Lawrence Livermore National Laboratory
G. Hackman
TRIUMF
P. Ruotsalainen
University of Jyväskylä
J. D. Holt
TRIUMF
McGill University
S. R. Stroberg
University of Washington
TRIUMF
C. Andreoiu
Simon Fraser University
G. C. Ball
TRIUMF
N. Bernier
University of the Western Cape
University of British Columbia (UBC)
TRIUMF
M. Bowry
TRIUMF
University of the West of Scotland
R. Caballero-Folch
TRIUMF
S. Cruz
TRIUMF
University of British Columbia (UBC)
A. Diaz Varela
University of Guelph
L. J. Evitts
University of Surrey
Bangor University
TRIUMF
R. Frederick
TRIUMF
A. B. Garnsworthy
TRIUMF
Matthias Holl
Saint Mary's University
TRIUMF
J. Lassen
TRIUMF
J. Measures
University of Surrey
TRIUMF
B. Olaizola
TRIUMF
CERN
E. O'Sullivan
TRIUMF
O. Paetkau
TRIUMF
J. Park
University of British Columbia (UBC)
Institute for Basic Science - Korea (IBS)
TRIUMF
J. Smallcombe
TRIUMF
University of Liverpool
C. E. Svensson
University of Guelph
K. Whitmore
Simon Fraser University
C. Y. Wu
Lawrence Livermore National Laboratory
PHYSICAL REVIEW C
2469-9985 (ISSN) 2469-9993 (eISSN)
Vol. 105 3 034332Subject Categories (SSIF 2011)
Subatomic Physics
Applied Mechanics
Geotechnical Engineering
DOI
10.1103/PhysRevC.105.034332