Gießen 2024 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Structure and Dynamics of Nuclei IV
HK 15.1: Gruppenbericht
Dienstag, 12. März 2024, 15:45–16:15, HBR 14: HS 4
Experiments with exotic nuclei at the FRS Ion Catcher — •Jianwei Zhao for the FRS Ion Catcher collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
At the FRS Ion Catcher, projectile and fission fragments are produced at relativistic energies, separated in-flight, energy-bunched, slowed down, and thermalized in a gas-filled cryogenic stopping cell (CSC). Subsequently, they are extracted and their masses are measured by using a Multiple-Reflection Time-Of-Flight Mass-Spectrometer (MR-TOF-MS). The MR-TOF-MS features mass resolving powers of up to one million and relative mass measurement accuracies of down to 2x10−8 with measurement times of merely a few tens of milliseconds.
Recently, direct mass measurements of neutron-deficient nuclides around the N = 50 shell closure below 100Sn, including the first direct mass measurements of 98Cd and 97Rh, shed light on the nuclear structure in this region and on the "100Sn mass riddle". Additionally, broadband mass measurements of fission fragments from a 252Cf spontaneous fission source reveal evidence for shape transitions in the N ∼ 90, Z = 56-63 region, and provide direct determination of independent isotopic fission yields.
An overview of the setup, recent experimental highlights, technical advances including the higher rate capability of CSC, upcoming experiments in FAIR Phase-0, including studies of multi-nucleon transfer reactions inside the CSC and direct mass measurements of neutron-rich nuclides along the N = 126 line below 208Pb, will be reported.
Keywords: Exotic nuclei; Mass measurement; MR-TOF-MS; Cryogenic Stopping Cell (CSC); FRS Ion Catcher