Abstract
The in-gas laser ionization and spectroscopy (IGLIS) technique was applied on the $^{212--215}\mathrm{Ac}$ isotopes, produced at the Leuven Isotope Separator On-Line (LISOL) facility by using the in-gas-cell and the in-gas-jet methods. The first application under on-line conditions of the in-gas-jet laser spectroscopy method showed a superior performance in terms of selectivity, spectral resolution, and efficiency in comparison with the in-gas-cell method. Following the analysis of both experiments, the magnetic-dipole moments for the $^{212--215}\mathrm{Ac}$ isotopes, electric-quadrupole moments and nuclear spins for the $^{214,215}\mathrm{Ac}$ isotopes are presented and discussed. A good agreement is obtained with large-scale nuclear shell-model calculations by using a $^{208}\mathrm{Pb}$ core.
Highlights
Heavy nuclei, close to the doubly magic nucleus 208Pb, are well described by large-scale nuclear-shell-model calculations indicating the robustness of the Z = 82 and N = 126 closed proton and neutron shells, respectively [1]
The in-gas laser ionization and spectroscopy (IGLIS) technique was applied on the 212–215Ac isotopes, produced at the Leuven Isotope Separator On-Line (LISOL) facility by using the in-gas-cell and the in-gas-jet methods
This paper reports on the laser ionization and spectroscopy measurements of neutron-deficient 212–215Ac isotopes to study ground-state magnetic-dipole moments, electric-quadrupole moments, and nuclear spins
Summary
Magnetic-dipole moments μ and electrical quadrupole moments Q are sensitive probes for the study of the singleparticle structure and collective behavior of nuclei and can be deduced from laser spectroscopy studies [4] Investigations of those properties in heavy nuclei are, hampered by low production rates and short half-lives of the isotopes of interest. The production and subsequent laser spectroscopy investigation of nobelium in a gas-cell system was demonstrated with a similar spectral resolution [7] Because of this limited spectral resolution the full hyperfine structure is often unresolved, preventing the determination of basic nuclear ground-state properties such as spins and quadrupole moments. The enhanced total efficiency under optimized experimental conditions enables the investigation of isotopes produced at very low production rates
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