SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Structure and Dynamics of Nuclei VI

HK 32.5: Vortrag

Mittwoch, 22. März 2023, 15:00–15:15, SCH/A215

Fission Isomers studies at the FRS — •Nazarena Tortorelli for the S530 collaboration — Ludwig-Maximilians-University, Munich, Germany — GSI Helmholtzentrum für Schwerionenforschung, Darmstadt, Germany

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. So far 35 fission isomers with lifetimes between 5 ps and 14 ms have been observed using only direct reactions (like (d,pf)). At the FRS the fragmentation mechanism (i.e., the collision of a heavy relativistic beam on a light target) can be exploited to offer rapid production, hence access to isomers with short half-lives, and most importantly, highly pure fragmented beams and event-by-event identification. Recently, fission isomer studies have been made with the FRS at GSI, where a 1 GeV/u ²³⁸U beam on a Be target was used. Different detection methods by implanting into a fast plastic scintillator and in the cryogenic stopping cell at the FRS Ion Catcher were used, and technical provisions have been implemented to cover a half-life range from about 50 ns to 50 ms. In this talk, the technical improvements as well as the status of the ongoing analysis will be presented. This work was supported by GSI R&D via LMTHI2023.