Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 44: Precision Spectrosocopy VII (nuclear systems) (joint session A/Q)
A 44.1: Vortrag
Freitag, 9. März 2018, 10:30–10:45, K 1.016
A direct nuclear laser excitation scheme for 229mTh — •Lars von der Wense1, Benedict Seiferle1, Simon Stellmer2, Johannes Weitenberg3, Georgy Kazakov2, Adriana Pálffy4, and Peter G. Thirolf1 — 1Ludwig-Maximilians-Universität München, 85748 Garching, Germany — 2Technische Universität Wien, 1040 Vienna, Austria — 3Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 4Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
Direct nuclear laser excitation has been a long-standing goal. By today there is only one nuclear excitation known which would allow for direct laser excitation due to its exceptionally low energy of only a few eV above the ground state. This is the metastable first excited state in 229Th. While direct nuclear laser excitation of 229Th ions in a Paul trap is still hindered by insufficient knowledge of the exact isomeric energy value, here a new laser excitation scheme for neutral 229Th atoms on a surface will be presented [1]. This excitation scheme circumvents the requirement of an improved knowlede of the isomeric energy, thereby paving the way for nuclear laser spectroscopy of 229mTh. It is making use of the recently detected internal conversion decay channel of the isomeric state [2] in combination with a short isomeric lifetime [3].
[1] L. v.d.Wense et al., PRL 119, 132503 (2017).
[2] L. v.d.Wense et al., Nature 533, 47-51 (2016).
[3] B. Seiferle et al., PRL 118, 042501 (2017).
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