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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Structure and Dynamics of Nuclei IX

HK 42.2: Talk

Wednesday, March 13, 2024, 16:00–16:15, HBR 19: C 5b

Discovery of isotopes and first broadband measurements of neutron-deficient light lanthanides via high precision mass spectrometry — •Christine Hornung for the S482 collaboration — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany

The structure and properties of nuclei approaching the drip-lines is of great interest and attracts a lot of attention from both, experiment and theory. In a recent experiment carried out in FAIR Phase-0, new isotopes towards the proton drip-line could be identified in the elements between Nd and Tb at the fragment separator FRS via event-by-event particle identification in-flight. In the same experiment, direct mass measurements were carried out with the MR-TOF-MS at the FRS Ion Catcher. A new technical approach, the so called mean range bunching, was applied, which allows efficient stopping of exotic nuclei; in the present experiment, it enabled the simultaneous broadband measurement of more than 35 nuclides in a single setting. The masses of more than 10 nuclides were measured for the first time, and the mass uncertainties of more than 10 nuclides were significantly reduced. These results give an insight into the nuclear structure and for the first time allow tracking of the proton drip line between 100Sn and 150Lu. In this contribution, these recent results and the new technical approaches will be reported.

Keywords: neutron-deficient light lanthanides; siscovery of isotopes; high precision mass spectrometry; MR-TOF-MS; FRS at GSI