2 Iconography
Access to the text (HTML) Access to the text (HTML)
PDF Access to the PDF text

Access to the full text of this article requires a subscription.
  • If you are a subscriber, please sign in 'My Account' at the top right of the screen.

  • If you want to subscribe to this journal, see our rates

  • You can purchase this item in Pay Per ViewPay per View - FAQ : 33,00 € Taxes included to order
    Pages Iconography Videos Other
    8 2 0 0

Comptes Rendus Physique
Volume 16, n° 5
pages 516-523 (juin 2015)
Doi : 10.1016/j.crhy.2015.02.007
Nuclear clocks based on resonant excitation of γ -transitions
Horloges nucléaires fondées sur l'excitation résonnante de transitions gamma

Ekkehard Peik , Maxim Okhapkin
 Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany 

Corresponding author.

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.

The full text of this article is available in PDF format.

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.

The full text of this article is available in PDF format.

Keywords : Atomic clock, Mössbauer spectroscopy, Th-229 isomer, Hyperfine structure, Electronic bridge, Ion trap

Mots-clés : Horloges atomiques, Spectroscopie Mössbauer, Thallium 229, Structure hyperfine, Pont électronique, Piège à ions

1  We are considering a situation where electronic bridge processes can be neglected because all electronic transitions are far detuned from the narrow nuclear resonance line.

© 2015  Académie des sciences@@#104156@@
EM-CONSULTE.COM is registrered at the CNIL, déclaration n° 1286925.
As per the Law relating to information storage and personal integrity, you have the right to oppose (art 26 of that law), access (art 34 of that law) and rectify (art 36 of that law) your personal data. You may thus request that your data, should it be inaccurate, incomplete, unclear, outdated, not be used or stored, be corrected, clarified, updated or deleted.
Personal information regarding our website's visitors, including their identity, is confidential.
The owners of this website hereby guarantee to respect the legal confidentiality conditions, applicable in France, and not to disclose this data to third parties.
Article Outline