Gießen 2024 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Nuclear Astrophysics IV
HK 49.2: Vortrag
Mittwoch, 13. März 2024, 18:00–18:15, HBR 14: HS 4
A Trap System for Measuring Neutron Capture Cross Sections for the r-process — •Heinrich Wilsenach1,4, Timo Dickel1,2, Israel Mardor4,5, Emma Haettner2, Wolfgang Plaß1,2, Christoph Scheidenberger1,2,3, and Mikhail Yavor6 — 1Justus-Liebig-Universität Gießen, Gießen, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 3HFHF, Gießen, Germany — 4Tel Aviv University, Tel Aviv, Israel — 5Soreq Nuclear Research Center, Yavne, Israel — 6St. Petersburg, Russia
One of the current limitations of predicting the nuclear astrophysics r-process abundance is the lack of experimental data of neutron-capture cross-sections of radioactive neutron-rich isotopes. Their measurement is currently considered very challenging due to the instability of the targets and projectile. To overcome this limitation, we plan to stop and thermalise fission fragments in a cryogenic stopping cell. These fragments will then form a cooled low-energy beam, which will be transported into an RF trap system (coined “NG-Trap”). An intense neutron beam will consequently irradiate this trapped “cloud target”. The reacted ions will be mass-selected, identified and counted using a multiple-reflection time-of-flight mass-spectrometer (MR-TOF-MS), thus extracting (n,γ) cross-sections. The talk will discuss the current status of a triple-RFQ system operating at Tel-Aviv University and present a measured trap capacity of more than 1010 ions. The system is the first step in designing the final NG-Trap system to be installed at the Soreq Applied Research Accelerator Facility (SARAF).
Keywords: r-process; SARAF; neutron capture; fission; ion trap