SAMOP 2023 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 2: Multi-Reflection Time-of-Flight Spectrometers
MS 2.5: Vortrag
Mittwoch, 8. März 2023, 12:00–12:15, F128
Mass measurements of neutron-rich nuclides at the N=126 shell with the FRS Ion Catcher — •Kriti Mahajan1, Daler Amanbayev1, Alison Bruce3, Timo Dickel1,2, Tuomas Grahn4, Gabriella Kripko-Koncz1, Ali Akbar Mehmandoost-Khajeh-Dad5, Stephane Pietri2, Wolfgang Plaß1,2, and Christoph Scheidenberger1,2 — 1JLU Gießen — 2GSI Darmstadt — 3University of Brighton, UK — 4University of Jyvaskyla, Finland — 5University of Sistan and Baluchestan, Zahedan, Iran
At GSI, experiments with exotic nuclides can be performed, including direct mass measurements. For such mass measurements, the nuclei can be produced at relativistic velocities by projectile fragmentation, separated, range-focused and slowed down in the fragment separator FRS and precise mass measurements are done with the FRS Ion Catcher. The beam from the FRS is injected into the cryogenic stopping cell (CSC), thermalized and transmitted to the multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). The MR-TOF-MS 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.
Mass measurements were performed in the region "south" of the doubly magic nucleus 208Pb close to the N=126 line, which is of key importance for the study of nuclear structure and nuclear astrophysics and can help us to better understand the r-process, in particular the third abundance peak. The preliminary results of these mass measurements will be presented along with comparisons with different mass models, including the first mass measurements of 204Au and 205Au.