Rostock 2019 – scientific programme
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A: Fachverband Atomphysik
A 18: Precision Spectroscopy of atoms and ions V (Th 229)
A 18.7: Invited Talk
Wednesday, March 13, 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).