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HK: Fachverband Physik der Hadronen und Kerne
HK 17: Structure and Dynamics of Nuclei VI
HK 17.5: Vortrag
Dienstag, 11. März 2025, 17:00–17:15, HS 2 Physik
Measurement of masses of fission products and isotopic yields from a 252Cf spontaneous fission source at the FRS Ion Catcher — •Meetika Narang for the FRS Ion Catcher collaboration — University of Groningen, Netherlands — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany.
Masses of neutron-rich nuclei and the nuclear fission process are essential for understanding nuclear structure far from stability and the abundance of elements synthesized through the r-process.
At the FRS Ion Catcher (FRS-IC) at GSI, fission fragments are produced via spontaneous fission (SF) from a 252Cf source mounted inside a gas-filled Cryogenic Stopping Cell (CSC). These fragments are thermalized and stopped within the CSC. Their masses and IIFYs are then measured with a Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS). The MR-TOF-MS resolves isobars, incorporating several novel and unique concepts, even with limited statistics. Its broadband nature ensures minimal relative systematic uncertainties among fission products. Extracting IIFYs includes isotope-dependent efficiency corrections for all the components of FRS-IC.
In this talk, I will present our results, including high-accuracy mass measurements representing the first direct mass measurements in the N = 90 and Z = 56-62 region. Additionally, I will discuss our IIFY results, which cover several tens of fission products, extending to the high-mass fission peak and yields as low as 10−5. Future experiments aim to broaden these results to cover a wider range of Z and N values, lower fission yields, and other spontaneously-fissioning actinides.
Keywords: Spontaneous fission; Isotopic Independent fission Yields; Mass Measurements; MR-TOF-MS; CSC