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.
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 language | English |
|---|---|
| Article number | 034332 |
| Journal | Physical Review C |
| Volume | 105 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 28 Mar 2022 |
| Externally published | Yes |