Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 51: Structure and Dynamics of Nuclei IX
HK 51.1: Gruppenbericht
Mittwoch, 30. März 2022, 16:00–16:30, HK-H7
Studying Exotic Nuclei with the FRS Ion Catcher — •Sönke Beck for the FRS Ion Catcher collaboration — Justus-Liebig-Universität, Gießen, Germany — GSI, Darmstadt, Germany
At the FRS at GSI, exotic nuclei are produced at relativistic velocities by projectile fragmentation or fission. With the FRS Ion Catcher (FRS-IC) experiment they can be slowed down and thermalized in a cryogenic stopping cell (CSC), which in addition contains a 252Cf spontaneous fission source. Their mass and abundance can be measured using a multiple-reflection time-of-flight mass-spectrometer (MR-TOF-MS). The MR-TOF-MS has single-ion sensitivity and features resolving powers of up to one million, or broadband measurements, like covering more than 20 mass units with mass resolving powers exceeding 250 000 in a measurement time of about 10 ms. Thus, very low yields can be handled and masses of nuclei from different production mechanisms can be measured accurately.
High-accuracy mass measurements at the borders of the known nuclear landscape were performed, including neutron-deficient light lanthanides close to the proton drip line and neutron rich nuclei around the N=126 shell closure. Masses of nuclei close to the N=Z line shed light on nuclear structure, for instance the proton-neutron interaction. From the 252Cf internal source, masses and yields of spontaneous fission products can be obtained. Further upgrades will allow studying multi nucleon transfer reactions, and the masses of the respective neutron-rich products can improve nuclear astrophysics r-process calculations. Recent results will be discussed, concluded by an outlook.