High-resolution laser spectroscopy of <SUP>27-32</SUP>Al

Heylen, H, Devlin, CS ORCID: 0000-0002-8034-0085, Gins, W, Bissell, ML, Blaum, K, Cheal, B, Filippin, L, Ruiz, RF Garcia, Godefroid, M, Gorges, C
et al (show 17 more authors) (2021) High-resolution laser spectroscopy of <SUP>27-32</SUP>Al. PHYSICAL REVIEW C, 103 (1). 014318-.

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Hyperfine spectra of $^\text{27-32}$Al ($Z=13$) have been measured at the ISOLDE-CERN facility via collinear laser spectroscopy using the $3s^23p\ ^2\text{P}^\text{o} _{3/2}\rightarrow 3s^24s\ ^2\text{S}_{1/2}$ atomic transition. For the first time, mean-square charge radii of radioactive aluminum isotopes have been determined alongside the previously unknown magnetic dipole moment of $^{29}$Al and electric quadrupole moments of $^{29,30}$Al. A potentially reduced charge radius at $N=19$ may suggest an effect of the $N=20$ shell closure, which is visible in the Al chain, contrary to other isotopic chains in the $sd$ shell. The experimental results are compared to theoretical calculations in the framework of the valence-space in-medium similarity renormalization group using multiple sets of two and three-nucleon forces from chiral effective field theory. While the trend of experimental magnetic dipole and electric quadrupole moments is well reproduced, the absolute values are underestimated by theory, consistent with earlier studies. Moreover, both the scale and trend of the charge radii appear to be very sensitive to the chosen interaction.

Item Type: Article
Uncontrolled Keywords: nucl-ex, nucl-ex
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 17 Mar 2021 16:18
Last Modified: 12 Oct 2023 03:47
DOI: 10.1103/PhysRevC.103.014318
Open Access URL: https://journals.aps.org/prc/abstract/10.1103/Phys...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3117573