In-gas laser ionization and spectroscopy of actinium isotopes near the N=126 closed shell

Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in At217,218,219 revealed by in-source laser spectroscopy

“…2 the g factors (g = μ/I ) for the odd-Z, even-N nuclei with N 126 are presented. Along with the results of the present work for 85 At isotopes, the data for 83 Bi ( [32] and references therein), 87 Fr ( [33,34]), and 89 Ac [35,36] isotopes are shown. Horizontal dotted lines mark the single-particle values of the g factors near doubly magic 208 Pb, for the relevant proton orbitals: π i 13/2 [37], π f 7/2 [38], and π h 9/2 (Schmidt estimation).…”

Search for octupole-deformed actinium isotopes using resonance ionization spectroscopy

“…The actinium measurements were performed at three facilities using different laser resonance ionization spectroscopy methods while probing the same atomic transition. First, the neutron-deficient isotopes 212−215 Ac were investigated using both on-line in-gas-cell (i.e., 212−215 Ac) and in-gas-jet (i.e., 214,215 Ac) laser spectroscopy at the LISOL facility in Louvainla-Neuve, Belgium [27,30]. Second, the neutron-rich isotopes 225,227 Ac were studied using off-line perpendicular highresolution laser spectroscopy at the Johannes Gutenberg University in Mainz, Germany [28,33].…”

“…where 215 Ac (with I = 9/2, g = 0.920(13) and a( 4 P • 5/2 ) = 2377(5){40} MHz [27,30]) was used as a reference to be consistent with the normalization applied in Ref. [30] for the neutron-deficient actinium isotopes. In this relation the hyperfine anomaly between 215 Ac and the neutron-rich actinium isotopes is neglected.…”

“…In this article, the results of an in-source laser ionization spectroscopy study of 225−229 Ac [26] performed at TRIUMF are reported and discussed along with the already-published isotopes [212][213][214][215]225,227 Ac [27][28][29][30]. Laser-spectroscopy experiments provide information on the change in mean-square charge radii along an isotopic chain, the nuclear spin, and the electromagnetic moments via isotope-shift and hyperfinestructure measurements.…”

Characterization of Supersonic Gas Jets for High-Resolution Laser Ionization Spectroscopy of Heavy Elements

“…The in-gas laser ionization and spectroscopy (IGLIS) technique has been in continuous development at KU Leuven during the past three decades [16], with extensive work published on the characterization and optimization of its performance [17][18][19]. In-gas-cell laser spectroscopy experiments were performed on neutron deficient 57;59 Cu [20], 97−101 Ag [21], and 212−215 Ac [22] at the Leuven Isotope Separator On-Line (LISOL) facility coupled to the CYCLONE accelerator of the Centre de Ressources du Cyclotron at Louvain-la-Neuve (Belgium). Information about ground-state properties of these nuclei, such as nuclear magnetic dipole moments, isotope shifts, and mean-square charge radii, were obtained.…”