Laser Spectroscopy of Thulium Isotopes Near the $N=82$ Shell Closure: Nuclear Moment and Charge Radius of ${}^{152\mathrm{m}}\mathrm{Tm}$
Year: 2026
Type: preprint
Abstract: We report on resonance ionization laser spectroscopy measurements performed on both neutron-deficient and neutron-rich thulium ($\mathrm{Tm}, Z=69$) isotopes. Isotope shifts were determined for three atomic ground-state transitions at wavelengths of $389.8\,\mathrm{nm}$, $388.4\,\mathrm{nm}$, and $388.8\,\mathrm{nm}$ in the isotopes ${}^{152\mathrm{m}}\mathrm{Tm}$, ${}^{153}\mathrm{Tm}$, ${}^{154\mathrm{m}}\mathrm{Tm}$, and ${}^{169}\mathrm{Tm}$. In addition, for the $389.8\,\mathrm{nm}$ transition, measurements were extended to the isotope ${}^{170}\mathrm{Tm}$, and the hyperfine structure was partially resolved for all five isotopes. For this transition, the isotope shift could be determined for one more isotope, ${}^{154\mathrm{m}}\mathrm{Tm}$. From the extracted hyperfine coupling constants, the nuclear magnetic dipole moment for ${}^{152\mathrm{m}}\mathrm{Tm}$ was determined for the first time, resulting in $μ\left({}^{152\mathrm{m}}\mathrm{Tm}\right) = 5.8(3) μ_\mathrm{N}$. Furthermore, the mean-square nuclear charge radius $δ\langle r^2\rangle^{152\mathrm{m},169} = -1.87(17)\,\mathrm{fm}^2$ for ${}^{152\mathrm{m}}\mathrm{Tm}$ was extracted from the measured isotope shifts.
Source: arXiv (Cornell University)
Authors: Weyrich, Jana, van Beek, Kenneth, Harshithbabu, Arya, Aayush, Berndt, Sebastian, Block, Michael, Brizard, Alexandre, Chhetri, Premaditya, Claessens, Arno, Düllmann, Christoph Emanuel, Ferrer, Rafael, Geldhof, Sarina, Giacoppo, Francesca, Gutierrez, Manuel J., Hasse, Raphael, Helmel, Christian, Heßberger, Fritz Peter, Hindermann, Julian, Ivandikov, Fedor, Jana, Biswajit, Kieck, Tom, Laatiaoui, Mustapha, Lecesne, Nathalie, Mistry, Andrew, Münzberg, Danny, Niemeyer, Thorben, Raeder, Sebastian, Rickert, Elisabeth, Rodriguez, Daniel, Savajols, Herve, Stemmler, Matou, Studer, Dominik, Walther, Thomas, Warbinek, Jessica, Van Duppen, Piet, Wendt, Klaus
Institutions: GSI Helmholtz Centre for Heavy Ion Research, Technische Universität Darmstadt, Johannes Gutenberg University Mainz, Helmholtz Institute Mainz, Grand Accélérateur National d'Ions Lourds, Facility for Rare Isotope Beams, Michigan State University, KU Leuven, Universidad de Granada, European Organization for Nuclear Research
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7171627901