Erlangen 2022 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 3: Studies of Nuclear Metastable States
MS 3.4: Vortrag
Dienstag, 15. März 2022, 11:35–11:50, MS-H9
Fission isomer studies with the FRS Ion Catcher — •Nazarena Tortorelli1, Timo Dickel2,3, Ilkka Pohjalainen2,4, Peter G. Thirolf1, Michiharu Wada5, and Jianwei Zhao2,6 — 1Ludwig-Maximilian-University, Munich, Germany — 2GSI Helmholtzentrum für Schwerionenforschung Darmstadt, Germany — 3JLU Gießen, Germany — 4University of Jyväskylä, Finland — 5KEK Wako Nuclear Science Center, Japan — 6Peking University, Beijing, China
The potential energy landscape in actinide nuclei (Z = 92-97, N = 141-151) shows a "super-deformed" second minimum. The ground state in this minimum is called a fission isomer, as it will preferably decay via isomeric (delayed) fission with known half-lives between 5 ps and 14 ms. The fragmentation mechanism (i.e. the collision of a heavy relativistic beam with a light target) offers rapid production, hence access to isomers with short half-lives, and most importantly, a clean beam and event-by-event identification.
In this contribution, we will present fission isomer studies (e.g. on 235mU) with the FRS Ion Catcher at GSI where a 1 GeV/u 238U beam fragments on a Be target. The projectile fragments are filtered by the FRS magnetic fragment separator and then slowed down and thermalized in the Cryogenic Stopping Cell (CSC) before being extracted into the diagnostic section for time-of-flight mass spectrometry (MR-TOF-MS).