The 229Th nucleus has an isomeric state at an energy of about 8 eV above the ground state,
several orders of magnitude lower than typical nuclear excitation energies. This has inspired …

In the last ten years extraordinary results in time and frequency metrology have been
demonstrated. Frequency-stabilization techniques for continuous-wave lasers and …

The low-energy, long-lived isomer in 229 Th, first studied in the 1970s as an exotic feature in
nuclear physics, continues to inspire a multidisciplinary community of physicists. It has …

Since 1967, the second as the base unit of time in the International System of Units (SI) is
defined via an unperturbed hyperfine transition in atomic caesium [1] that is interrogated by …

We consider theoretically isomeric excitation of Th 229 in a laser-heated cluster. A Th 229
cluster is first radiated by an intense femtosecond laser pulse, causing ionization of the …

The first excited isomeric state of Th 229 possesses the lowest energy among all known
excited nuclear states. The expected energy is accessible with today's laser technology and …

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 …

Peik and Tamm [Europhys. Lett. 61, 181 (2003) EULEEJ 0295-5075 10.1209/epl/i2003-
00210-x] proposed a nuclear clock based on the isomeric transition between the ground …

Abstract The Gamma Factory (GF) is an ambitious proposal, currently explored within the
CERN Physics Beyond Colliders program, for a source of photons with energies up to≈ 400 …

We propose a new approach to excite the isomeric Th 229 nuclear state, which has attracted
much attention recently as a potential “nuclear clock.” Our approach is based on a laser …