Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Structure and Dynamics of Nuclei V

HK 29.3: Vortrag

Dienstag, 29. März 2022, 16:30–16:45, HK-H6

Commissioning and status of a gas-jet apparatus for laser spectroscopy of the heaviest elements — •Jeremy Lantis for the GSI Gas Jet collaboration — Johannes Gutenberg University Mainz, 55099 Mainz, Germany — Helmholtz Institute Mainz, 55099 Mainz, Germany

Laser spectroscopy measurements can provide information about fundamental properties of both atomic and nuclear structure. These techniques are of particular importance for the heaviest actinides and superheavy elements, where atomic data are sparse. Recent resonance ionization spectroscopy experiments at GSI, Darmstadt have focused on in-gas-cell measurements using the RADRIS technique, with success measuring several nobelium and fermium isotopes. However, the limited resolution of these measurements hampers the precision in determining the nuclear moments and spin. To overcome these limitations, a new gas-jet apparatus has been constructed to perform laser spectroscopy of atoms in a hypersonic jet, providing an almost collision-free and reduced Doppler broadened environment, which improves the achievable resolution by an order of magnitude and provides substantially improved nuclear data of exotic nuclei. The reach and capabilities of the apparatus will be discussed, as well as planned online experiments involving the determination of the nuclear moments of ^253,255No and the definitive identification of the nucleonic configuration of the K^π = 8⁻ isomer of ^254mNo.