Mainz 2026 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 3: Actinide Analysis

MS 3.2: Hauptvortrag

Dienstag, 3. März 2026, 11:30–12:00, N 6

Precision mass measurements of exotic fission fragments — •Arthur Jaries for the JYFLTRAP and ISOLTRAP collaboration — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Direct measurement of the mass of single nuclides allows to determine their binding energy and gives information on the evolution of nuclear structure away from stability. Among the available experimental methods, Penning-trap mass spectrometry provides the most precise technique to probe this fundamental nuclear property, typically reaching a relative uncertainty of one part per billion. Additionally relevant for astrophysics, precision mass measurements produce valuable inputs for the theoretical models describing the stellar nucleosynthesis processes such as the rapid neutron capture (r) process. The latter is responsible for the production of more than half of the elemental abundances above iron, making mass spectrometry of radionuclides involved a tool to better understand the origin of heavy elements in the Universe. In the recent years at the JYFL Accelerator Laboratory in Finland, the use of the JYFLTRAP Penning traps combined with the fast and universal IGISOL production method, led to the determination of more than 100 atomic masses across the nuclide chart, with a specific focus on the rare-earth and the ¹³²Sn neutron-rich regions. This presentation highlights the latest measurement campaigns of exotic fission fragments of uranium performed with the JYFLTRAP, discussing their implications for nuclear structure and r-process modeling.

Keywords: Mass spectrometry; Penning trap; Nuclear astrophysics; Nuclear structure