Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 14: Poster Session - Atomic Physics II
A 14.24: Poster
Tuesday, March 10, 2020, 16:00–18:00, Empore Lichthof
A recoil ion source providing slow 229(m)Th ions in a broad charge state distribution — •Tom Kieck1,2, Dmitry Budker1,2,3,4, Christoph E. Düllmann1,2,4,5, Raphael Haas1,2, Dennis Renisch1,2, and Ferdinand Schmidt-Kaler1 — 1Johannes Gutenberg-Universität Mainz, Germany — 2Helmholtz-Institut Mainz, Germany — 3University of California, Berkeley, CA, USA — 4PRISMA Cluster of Excellence, Mainz, Germany — 5GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
229mTh is a nuclide of high interest in fundamental and applied physics. Currently, 229mTh is best obtained from the alpha decay of 233U. The TACTICa (Trapping And Cooling of Thorium Ions with Calcium) collaboration aims at capturing Th ions inside a 40Ca+ Coulomb crystal. They will be sympathetically cooled in a Paul trap and available for precision spectroscopy. For 229Th, the alpha decay imparts 84 keV kinetic energy. The recoil ions are electrostatically decelerated to facilitate trapping. This mechanism retains the original charge state distribution up to high charge states. Complementary, a laser-ablation ion source is installed, providing Th1+ ions of isotopes available in macroscopic quantities. This combination of ion sources allows the investigation of a large number of Th isotopes in different charge states. Simulation results of the ion beam, alpha spectra of the 233U source and a first design of the setup will be presented.
R. Haas et al., arXiv:1911.11674