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München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Structure and Dynamics of Nuclei X

HK 50.1: Group Report

Thursday, March 21, 2019, 14:00–14:30, HS 16

Towards a direct energy determination of the 229Th nuclear isomer — •Benedict Seiferle, Ines Amersdorffer, Lars von der Wense, 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. First measured spectra will be presented.
This work was supported by DFG (Th956/3-2) and by the EU’s Horizon 2020 research and innovation programme under grant agreement 6674732 ”nuClock”.

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