Independent isotopic fission yields of ²⁵²Cf spontaneous fission via mass measurements at the FRS Ion Catcher

We present first preliminary results of a novel method for measuring independent isotopic fission yields (IIFYs) spontaneous (SF) via direct mass measurements, at the FRS Ion Catcher (FRS-IC) GSI. Fission products were generated from 252 Cf source installed in cryogenic stopping cell, and identified counted with multiple-reflection time-of-flight spectrometer (MR-TOF-MS) FRS-IC, utilizing well-established measurement data analysis methods. The MR-TOF-MS resolves isobars unambiguously, even limited statistics, its non-scanning nature ensures minimal relative systematic uncertainties amongst products. extracting IIFYs includes isotope-dependent efficiency corrections all components FRS-IC. In particular, we applied self-consistent technique that takes into account element-dependent survival efficiencies CSC, due to chemical reactions buffer gas. Our IIFY results, which cover several tens less-accessible high-mass peak (Z = 56 63) down level 10 −5 , are generally similar those nuclear database ENDF/B-VII.0. Nevertheless, they reveal some structures not observed smooth trends. These planned campaign investigate distributions Upcoming experiments will extend our wider Z N ranges, lower yields, other spontaneously-fissioning actinides.