SMuK 2021 – scientific programme
SYAW 1.2: Prize Talk
Wednesday, September 1, 2021, 10:45–11:15, Audimax
The 229Th nuclear isomer — •Benedict Seiferle — LMU Munich, Garching b. München, Germany — Laureate of the Gustav-Hertz-Prize 2021
While nuclear transitions are typically situated in the keV or MeV range, the first nuclear isomeric excited state in 229Th (229mTh) with an excitation energy of only ≈8 eV [1, 2] occupies an exceptional position in the nuclear landscape. Such a low excitation energy is accessible with today’s lasers and thus 229Th can principally be excited with laser radiation. Together with an expected (radiative) lifetime of several 1000 s 229mTh can be used as a basis for a nuclear optical clock  which could be employed in the search for new physics.
In this talk I will give an overview on the progress that has been reached during the last years and present the current status of the 229mTh research at LMU Munich.
 B. Seiferle et al., Nature 573, 243-246, 2019.
 T. Sikorsky et al., PRL 125, 142503, 2020.
 E. Peik und C. Tamm, Europhys. Letters, 61, 2, 181-186, 2003.