Gießen 2024 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 66: Structure and Dynamics of Nuclei XIII
HK 66.6: Vortrag
Donnerstag, 14. März 2024, 17:00–17:15, HBR 19: C 5b
Fission Isomer Studies at IGISOL and at the FRS — •Nazarena Tortorelli for the I290 collaboration and the Super-FRS Experiment collaboration — LMU Munich, Germany
A century from the discovery of nuclear isomers, amongst them strongly deformed fission isomers in the actinides, they are still under high scientific interest. So far 35 fission isomers with lifetimes between 5 ps and 14 ms have been observed. The longest-lived fission isomer known so far, with a half-life of 14 ms, was found in 242Am populated via the 242Pu(d, 2n) reaction, while for 240fAm, populated via the 240Pu(d, 2n)240Am reaction, a 0.9 ms half-life was predicted. Recently, at IGISOL an experiment was performed investigating the fission isomer states in 240,242Am. The isomeric states have been populated via deuteron induced fusion-evaporation reactions on a 242Pu target and the decay time and the kinetic energy of the fission isomers have been measured. Moreover, at the FRS, a new isomer population scheme was investigated: projectile fragmentation (i.e., the collision of a heavy relativistic beam of 1GeV/u 238U on a light Be target). This scheme offers rapid production, hence access to isomers with short half-lives, and most importantly, highly pure fragmented beams and event-by-event identification. In this talk the recent experiment at IGISOL will be presented together with a preliminary overview of the experiment performed at the FRS showing the status of the fission isomers studies and the possibilities for future investigations. Supported by GSI F&E (LMTHI2023).
Keywords: (240f,242f)Am; half-life; fission isomers; IGISOL; FRS