Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 18: Precision Spectroscopy of atoms and ions V (Th 229)

A 18.7: Hauptvortrag

Mittwoch, 13. März 2019, 15:30–16:00, S HS 2 Physik

Towards a precise energy determination of the ²²⁹Th nuclear isomer — •Benedict Seiferle, Lars v.d. Wense, Ines Amersorffer, and Peter G. Thirolf — LMU Munich, 85748 Garching, Germany.

The nuclear first excited state in ²²⁹Th (^229mTh) offers the unique possibility of a direct optical control of a nucleus with today’s laser technology. The energy of 7.8(5) eV and it’s lifetime make it a promising candidate for a nuclear optical clock. The large uncertainty of the excitation energy, however, impedes progress towards a nuclear clock. Therefore the objective of our experiment is a precise determination of the excitation energy of ^229mTh via the measurement of electrons emitted during the internal conversion decay of the excited state [1,2]. The experimental setup as well as first measured spectra will be presented.

This work was supported by DFG (Th956/3-2) and by the European Union’s Horizon 2020 research and innovation programme under grant agreement 6674732 "nuClock".
L.v.d. Wense et al., Nature 553, 47 (2016). [2] B. Seiferle et al., PRL 118, 042501 (2017).