SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Structure and Dynamics of Nuclei VIII

HK 42.1: Gruppenbericht

Mittwoch, 22. März 2023, 15:45–16:15, SCH/A215

Nuclear structure studies far from stability with the FRS Ion Catcher — •Christine Hornung for the FRS Ion Catcher collaboration — GSI, Darmstadt, Germany,

At the FRS Ion Catcher at GSI, projectile and fission fragments are produced at relativistic energies at the FRS, separated in-flight, range-focused, slowed-down and thermalized in a cryogenic stopping cell and transmitted to a Multiple-Reflection Time-of-Flight Mass Spectrometer (MR-TOF-MS) for high-accuracy (down to Δ m/m∼10⁻⁸) direct mass measurements. Mass measurements of projectile fragments in the vicinity of ¹⁰⁰Sn were performed, including the first direct mass measurement of the ⁹⁸Cd ground state and the discovery of isomeric states. The measured excitation energies are compared with large-scale shell model calculations; they indicate the importance of core excitation around ¹⁰⁰Sn. Light neutron-deficient lanthanides were investigated. In this measurement the potential to perform surveys covering a large region on the chart of nuclei using an MR-TOF-MS was shown. Additionally, mass measurements of neutron-rich nuclei revealed evidence for shape transitions in the N≈ 90, Z=56-63 region. These results, recent technical upgrades at the FRS-IC, news from the next-generation CSC for the Super-FRS at FAIR and an outlook to plans for future experiments will be presented.