Gießen 2024 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Structure and Dynamics of Nuclei IV
HK 15.3: Talk
Tuesday, March 12, 2024, 16:30–16:45, HBR 14: HS 4
Mass measurements of neutron-deficient nuclides below 100Sn at the FRS Ion Catcher, GSI — •Gabriella Kripkó-Koncz for the FRS Ion Catcher collaboration — Justus-Liebig-Universität Gießen, Gießen, Germany
The heavy N=Z nuclei and the nuclei in their vicinity are highly interesting to study; they can provide important insights about nuclear structure, symmetries and interactions and have a high impact in modelling nuclear astrophysics processes (rp-process, νp-process). A few examples of the striking phenomena are the formation of high-spin isomeric states, the direct and/or β-delayed proton emission from ground or excited states and the strong resonances in Gamow-Teller transitions close to the proton dripline. The FRS Ion Catcher (FRS-IC) experiment at the in-flight fragment separator FRS at GSI enables highly accurate direct mass measurements (δ m/m ∼ 10−8) with thermalized projectile and fission fragments by combining a cryogenic stopping cell and a multiple-reflection time-of-flight mass spectrometer. Supported by mass measurements at the FRS-IC within FAIR Phase-0, the evolution of Gamow-Teller transition strengths for even-even N=50 isotones was studied [1]. Besides this, the riddle surrounding the exotic decay modes of the (21+) high-spin isomer of 94Ag was further unraveled. These results will be presented together with intricacies of the data analysis when analyzing data obtained synchronously by FRS and FRS-IC.
[1] A. Mollaebrahimi et al., Phys. Lett. B 839, 137833 (2023).
Keywords: exotic nuclei; mass measurement; N=Z nuclei; isomer states; proton radioactivity