Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Structure and Dynamics of Nuclei II

HK 2.3: Vortrag

Montag, 10. März 2025, 15:45–16:00, HS 3 Physik

Laser spectroscopy of neutron-deficient thulium — •Hendrik Bodnar for the COLLAPS/ISOLDE collaboration — Institut für Kernphysik, TU Darmstadt, Darmstadt, Germany

Collinear laser spectroscopy is well suited to study nuclear properties of isotopes. Through measurements of the isotope shifts and hyperfine splittings, the differential mean-square charge radii, the magnetic dipole moments, electric quadrupole moments and the nuclear spin can be determined. It excels particularly for short-lived isotopes.

An interesting candidate to study is ¹⁴⁷Tm, as it is close to the proton drip line and has a decay branch for proton emission. So far, a charge radius of a proton emitter has never been measured and would constitute a benchmark for nuclear stucture theory, e.g., for Density Functional Theory (DFT). During two beam times at COLLAPS/ISOLDE in 2023 and 2024, the isotopic chain of thulium was measured from ¹⁷⁵Tm - ¹⁵²Tm and provided a wealth of nuclear structure data towards the final goal of studying ¹⁴⁷Tm. These results, as well as an outlook towards a measurement of the proton emitter, will be provided. Funding from the BMBF under contracts 05P21RDCI1 and 05P21RDFN1 is acknowledged.

Keywords: Charge radius; thulium; collinear laser spectroscopy; COLLAPS