Comptes Rendus
Nuclear clocks based on resonant excitation of γ-transitions
Comptes Rendus. Physique, Volume 16 (2015) no. 5, pp. 516-523.

We review the ideas and concepts for a clock that is based on a radiative transition in the nucleus rather than in the electron shell. This type of clock offers advantages like an insensitivity against field-induced systematic frequency shifts and the opportunity to obtain high stability from interrogating many nuclei in the solid state. Experimental work concentrates on the low-energy (about 8 eV) isomeric transition in 229Th. We review the status of the experiments that aim at a direct optical observation of this transition and outline the plans for high-resolution laser spectroscopy experiments.

Nous passons en revue les idées et concepts d'une horloge fondée sur une transition radiative entre niveaux nucléaires plutôt qu'électroniques. Ce type d'horloge offre des avantages comme l'insensibilité aux déplacements systématiques de fréquence induits par des champs externes et l'opportunité d'obtenir une haute stabilité grâce à l'interrogation de nombreux noyaux en phase solide. Le travail expérimental porte essentiellement sur une transition isomérique à basse énergie (environ 8 eV) du 229Th. Nous décrivons le statut des expériences qui visent à effectuer une observation directe de cette transition et les projets de spectroscopie laser à haute résolution.

Published online:
DOI: 10.1016/j.crhy.2015.02.007
Keywords: Atomic clock, Mössbauer spectroscopy, Th-229 isomer, Hyperfine structure, Electronic bridge, Ion trap
Mot clés : Horloges atomiques, Spectroscopie Mössbauer, Thallium 229, Structure hyperfine, Pont électronique, Piège à ions

Ekkehard Peik 1; Maxim Okhapkin 1

1 Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
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Ekkehard Peik; Maxim Okhapkin. Nuclear clocks based on resonant excitation of γ-transitions. Comptes Rendus. Physique, Volume 16 (2015) no. 5, pp. 516-523. doi : 10.1016/j.crhy.2015.02.007. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2015.02.007/

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