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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Poster

HK 23.7: Poster

Dienstag, 11. März 2025, 17:30–19:00, Foyer Physik

Investigation of the internal conversion lifetime of ^229mTh on various metallic surfaces — •Daniel Moritz, Georg Holthoff, Kevin Scharl, Tamila Teschler, Markus Wiesinger, and Peter G. Thirolf — Ludwig Maximilians Universität München

With its exceptionally low energy of about 8.4 eV, the first isomeric state of ²²⁹Th, denoted ^229mTh, is in the focus of current research as the presently only suitable nuclear transition accessible with current laser technology to serve as basis for a nuclear clock. For neutral ^229mTh, its decay is dominated by internal conversion (IC). One of the isomer’s properties still to be investigated is the dependence of the IC lifetime on the electronic environment as hinted at in [1]. This will now be evaluated systematically by neutralizing ^229mTh ions on various sputter-cleaned metallic surfaces with different work functions. This poster presents the current status of this experimental campaign at LMU.
This work has been supported by the ERC Synergy Grant "ThoriumNuclearClock" (Grant Agreement 856415).
[1] B. Seiferle, Diss. LMU (2019)