High-resolution laser spectroscopy of ${}^{27-32}$Al

Abstract

Hyperfine spectra of ${}^{\text{27-32}}$Al ($Z=13$) have been measured at the ISOLDE-CERN facility via collinear laser spectroscopy using the $3s^{2}3p{}^2{\text{P}}_{3/2}^{\text{o}}\to 3s^{2}4s{}^2{\text{S}}_{1/2}$ 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.

References in corpus (12)

• Chiral effective field theory and nuclear forces
• Improved nuclear matter calculations from chiral low-momentum interactions
• Accurate nuclear radii and binding energies from a chiral interaction
• A nucleus-dependent valence-space approach to nuclear structure
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• Ground-State Electromagnetic Moments of Calcium Isotopes
• Charge radius of the short-lived ${}^{68}$Ni and correlation with the dipole polarizability
• Ground State Electromagnetic Moments of ${}^{37}$Ca
• Multiconfiguration calculations of electronic isotope shift factors in Al I
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• Impact of two-body currents on magnetic dipole moments of nuclei
• Isotope Shifts in Cadmium as a Sensitive Probe for Physics Beyond the Standard Model
• Nuclear charge radii of Na isotopes: A tale of two theories
• First Determination of the 27Al Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement
• Kinetic-beam-energy determination via collinear laser spectroscopy
• Nuclear charge radius of ${}^{26m}$Al and its implication for V${}_{ud}$ in the quark-mixing matrix
• Electromagnetic moments of the antimony isotopes ${}^{112-133}$Sb
• Critical evaluation of reference charge radii and applications in mirror nuclei
• Ground State Magnetic Dipole Moment of ${}^{40}$Sc
• Triaxial relativistic Hartree-Bogoliubov theory in continuum for exotic nuclei
• Cabibbo-Kobayashi-Maskawa unitarity deficit reduction via finite nuclear size
• Isotope-shift factors with quantum electrodynamics effects for many-electron systems: A study of the nuclear charge radius of ${}^{26m}$Al
• Implication of shell quenching in scandium isotopes around N=20
• Exploring nuclear structure with multiparticle azimuthal correlations at the LHC
• Modelling of transient interference phenomena in collinear laser spectroscopy