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 …

LiSrAlF 6 crystals doped with Th 229 are used in a laser-based search for the nuclear
isomeric transition. Two spectroscopic features near the nuclear transition energy are …

The rapid-neutron capture process (r process) is identified as the producer of about 50% of
elements heavier than iron. This process requires an astrophysical environment with an …

The 7.6 (5) eV nuclear magnetic-dipole transition in a single Th 3+ 229 ion may provide the
foundation for an optical clock of superb accuracy. A virtual clock transition composed of …

Today's most precise time and frequency measurements are performed with optical atomic
clocks. However, it has been proposed that they could potentially be outperformed by a …

The isotope 229Th is the only nucleus known to possess an excited state 229mTh in the
energy range of a few electronvolts—a transition energy typical for electrons in the valence …

We outline laser interferometer measurements to search for variation of the electromagnetic
fine-structure constant α and particle masses (including a nonzero photon mass). We …

The pygmy dipole resonance has been studied in the proton-magic nucleus Sn 124 with the
(α, α′ γ) coincidence method at E α= 136 MeV. The comparison with results of photon …

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 …

After nearly 50 years of searching, the vacuum ultraviolet 229 Th nuclear isomeric transition
has recently been directly laser excited 1, 2 and measured with high spectroscopic precision …