Laser Spectroscopy of Thulium Isotopes Near the (N=82) Shell Closure: Nuclear Moment and Charge Radius of ${}^{152\mathrm{m}}\mathrm{Tm}$
Authors:
Jana Weyrich,
Kenneth van Beek,
Harshitbabu XXX,
Aayush Arya,
Sebastian Berndt,
Michael Block,
Alexandre Brizard,
Premaditya Chhetri,
Arno Claessens,
Christoph Emanuel Düllmann,
Rafael Ferrer,
Sarina Geldhof,
Francesca Giacoppo,
Manuel J. Gutierrez,
Raphael Hasse,
Christian Helmel,
Fritz Peter Heßberger,
Julian Hindermann,
Fedor Ivandikov,
Biswajit Jana,
Tom Kieck,
Mustapha Laatiaoui,
Nathalie Lecesne,
Andrew Mistry,
Danny Münzberg
, et al. (11 additional authors not shown)
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 ${}^{152\mathrm{m}}\mathrm{Tm}$, ${}^{153}\mathrm{Tm}$,…
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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. From the extracted hyperfine coupling constants, the nuclear magnetic dipole moment for ${}^{152\mathrm{m}}\mathrm{Tm}$, $μ\left({}^{152\mathrm{m}}\mathrm{Tm}\right) = 5.8(3)\,μ_\mathrm{N}$ was determined. Furthermore, the measured isotope shifts enabled the extraction of the change in the mean-square nuclear charge radius $δ\langle r^2\rangle^{152\mathrm{m},169} = -1.86(25)\,\mathrm{fm}^2$ for ${}^{152\mathrm{m}}\mathrm{Tm}$.
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Submitted 27 July, 2026;
originally announced July 2026.