A novel system has been developed to detect simultaneous double-alpha emission from purified and weightless sources. The system includes the collection of 224Ra low-energy recoils in purified helium buffer gas from the decay of 228Th. The recoil products are thermalized and collected in a cryogenic buffer gas cell and extracted into an RF-ion guide for mass selection. The mass-separated ions are implanted at low kinetic energy into a thin carbon foil placed between two large-area double-sided silicon strip detectors to observe correlated alpha-particle emission. The apparatus is described in detail, including insights into its experimental performance.


FundersFunder number
Helmholtz Graduate School for Hadron and Ion Research
Justus Liebig Universität Gießen
Deutscher Akademischer Austauschdienst
GSI Target Laboratory
ExtreMe Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung
GSI Helmholtzzentrum für Schwerionenforschung
Romanian Ministry of Research, Innovation and Digitalization
Bundesministerium für Bildung und Forschung05P21RGFN1, 05P19RGFN1
Bundesministerium für Bildung und Forschung
Science and Technology Facilities CouncilST/P004008/1, ST/V001051/1
Science and Technology Facilities Council
Deutsche ForschungsgemeinschaftAY 155/2-1
Deutsche Forschungsgemeinschaft
Tel Aviv UniversityPN
Tel Aviv University


    • 224-Ra
    • Cryogenic stopping cell
    • DSSD
    • Double-alpha decay
    • Exotic radioactive decay modes


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