Laser Spectroscopy of Thulium Isotopes Near the (N=82) Shell Closure: Nuclear Moment and Charge Radius of ^152mTm

2026/07/27 by Jana Weyrich, Kenneth van Beek, Harshitbabu XXX +33
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Abstract

We report on resonance ionization laser spectroscopy measurements performed on both neutron-deficient and neutron-rich thulium (Tm, Z=69) isotopes. Isotope shifts were determined for three atomic ground-state transitions at wavelengths of 389.8 nm, 388.4 nm, and 388.8 nm in the isotopes ^152mTm, ¹⁵³Tm, ^154mTm, and ¹⁶⁹Tm. In addition, for the 389.8 nm transition, measurements were extended to the isotope ¹⁷⁰Tm, and the hyperfine structure was partially resolved for all five isotopes. From the extracted hyperfine coupling constants, the nuclear magnetic dipole moment for ^152mTm, μ(^152mTm) = 5.8(3) μ_N was determined. Furthermore, the measured isotope shifts enabled the extraction of the change in the mean-square nuclear charge radius δ⟨ r²⟩^152m,169 = -1.86(25) fm² for ^152mTm.

Citations

• Nuclear magnetic moments in covariant density functional theory

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