Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 17: Structure and Dynamics of Nuclei VI
HK 17.1: Gruppenbericht
Dienstag, 11. März 2025, 15:45–16:15, HS 2 Physik
Experiments with exotic nuclei at the FRS Ion Catcher — •Kriti Mahajan for the Super-FRS Experiment collaboration — Justus-Liebig Universität Gießen, Germany — Helmholtz Research Academy Hesse for FAIR (HFHF), Campus Gießen, Germany
At GSI Darmstadt exotic nuclei can be produced at relativistic energies by projectile fragmentation or fission and separated in the fragment separator FRS. Then at FRS Ion Catcher, the beam is thermalized inside the cryogenic stopping cell (CSC) and transmitted to the multiple reflection time-of-flight mass spectrometer (MR-TOF-MS), which features a high resolving power of up to 1,000,000, short cycle times of a few ten milliseconds and mass accuracies down to a few 10−8.
At FRS-IC, several masses have been measured so far across the nuclear chart. Direct mass measurements of neutron-deficient nuclides around N=Z below 100Sn and neutron-rich nuclides along N=126 below 208Pb have been performed and shed light on the nuclear structure in these regions. Additionally, broadband mass measurements of fission fragments from a 252Cf spontaneous fission source reveal evidence for shape phase transitions in the N ∼ 90, Z = 56−63 region, and provide direct determination of independent isotopic fission yields (IIFYs). Recently, proof-of-principle experiments were performed focused in the multi-nucleon transfer reactions and study of radioactive molecules driven by the hunt to explore fundamental laws of nature.
An overview of the setup, recent experimental highlights, technical advances and upcoming experiments in FAIR Phase-0 will be reported.
Keywords: Exotic nuclei; Mass measurements; MR-TOF-MS; Cryogenic Stopping Cell (CSC); FRS Ion Catcher