Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Poster Session - Atomic Physics II
A 14.11: Poster
Dienstag, 10. März 2020, 16:00–18:00, Empore Lichthof
Catching and trapping thorium ions from external laser-ablation ion source in a linear Paul trap and sympathetic cooling with a large calcium ion crystal — •Sebastian Wolf1, Wenbing Li1, Tom Kieck1,2, Raphael Haas1,2, Christoph E. Düllmann1,2,3,4, Dmitry Budker1,2,3, and Ferdinand Schmidt-Kaler1 — 1Johannes Gutenberg-Universität Mainz — 2Helmholtz-Institut Mainz — 3PRISMA, Cluster of Excellence, Mainz — 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt
Isotopes of thorium, including 229Th with its isomeric state provide for interesting spectroscopic tests of fundamental symmetries of nature. Trapping and sympathetically cooling thorium ions into a Paul trap is a precondition for such studies. For the production of 232Th+ we have demonstrated laser-ablation, electron impact ionization and injection from this external source, followed by trapping and sympathetic cooling [1] and ion mass identification [2]. A new ion trap setup is now optimized to capture 229Th produced from a recoil source from α-decay of 233U [3]. Due to the spontaneous nature of radioactive decay, no timing information is available concerning the production of 229Th. Therefore, we employ polarization gradient cooling of a large calcium ion crystal. Incoming injected thorium ions will heat the ion crystal to reveal a signature which allows for time-dependent switching of trap potentials for rapid identification of successful capture.
[1] K. Groot-Berning et al., Phys. Rev. A 99, 023420 (2019).
[2] F. Stopp et al., Hyperfine Interact 240:33 (2019).
[3] R. Haas et al., arXiv: 1911.11674 (2019).