Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 62: Nuclear Astrophysics V
HK 62.2: Vortrag
Donnerstag, 14. März 2024, 16:15–16:30, HBR 14: HS 4
Mass measurements of neutron-rich nuclides at the N=126 shell closure with the FRS Ion Catcher — •Kriti Mahajan for the S468 experiment collaboration — Justus-Liebig-Universität Gießen, Germany — HFHF, Gießen Campus
At GSI Darmstadt experiments with exotic nuclides can be performed, enabling the study of nuclei far from stability. These nuclei can be produced at relativistic energies by projectile fragmentation or fission and separated in the fragment separator FRS.
An experiment was performed in the region "south" of the doubly magic nucleus 208Pb close to the N=126 line, which is of key importance for nuclear structure and nuclear astrophysics studies and can help us to better understand the r-process, in particular the third abundance peak. The experiment aimed to identify new neutron rich isotopes and to measure their production cross sections, masses and half lives. Mean range bunching was used to efficiently stop the beam further in an active stopper for half-life measurements and in the FRS Ion Catcher (FRS-IC) for precise mass measurements.
At FRS-IC, the beam is thermalized inside the cryogenic stopping cell 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 1E-8. The preliminary results of these mass measurements will be presented, including the first mass measurements of 204Au, 205Au and 200Ir.
Keywords: Mass measurements; Cryogenic stopping cell; MR-TOF-MS; r-process; Mean Range Bunching