Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Structure and Dynamics of Nuclei V

HK 25.2: Vortrag

Dienstag, 27. Februar 2018, 17:00–17:15, HZO 80

Towards a precise energy determination of the ²²⁹Th nuclear clock transition — •Benedict Seiferle, Lars von der Wense, and Peter G. Thirolf — LMU München, Am Coulombwall 1, 85748 Garching

The first isomeric excited nuclear state of ²²⁹Th (denoted with ^229mTh) exhibits the lowest excitation energy in nuclear physics which has been measured indirectly to be 7.8(5) eV. The uniquely low transition energy which corresponds to a wavelength of approximately 160 nm makes it possible to drive the transition with lasers. This in turn may pave the way for a long list of interesting applications (such as a nuclear optical clock) which has so far been hindered by the rather large uncertainty in the reported energy value. In this talk an experimental scheme is presented that uses internal conversion electrons which are mitted in the ground-state decay of ^229mTh [1,2] and first results are shown. With these measurements a precise and direct determination of the excitation energy is in reach.

L. v.d. Wense et al., Nature 533, 47-51 (2016).
B. Seiferle et al., PRL 118, 042501 (2017).
This work was supported by the European Union’s Horizon 2020 research and innovation programme under grant agreement 664732 "nu- Clock" & by DFG Grant No. Th956/3-2.