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 …

The experimental and theoretical evidence for octupole collectivity in nuclei is reviewed.
Recent theoretical advances, covering a wide spectrum from mean-field theory to algebraic …

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 …

The energy splitting of the Th 229 ground-state doublet is measured to be 7.6±0.5 eV,
significantly greater than earlier measurements. Gamma rays produced following the alpha …

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 …

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 …

We estimate the range of the radiative lifetime and energy of the anomalous, low-energy
3/2+(7.8±0.5 eV) state in the Th 229 nucleus. Our phenomenological calculations are based …

We report the results of a direct search for the Th 229 (I π= 3/2+← 5/2+) nuclear isomeric
transition, performed by exposing Th 229-doped LiSrAlF 6 crystals to tunable vacuum …

The reduced magnetic dipole and electric quadrupole transition probabilities for the
radiative decay of the Th 229 7.8 eV isomer to the ground state are predicted within a …

The proposal for the development of a nuclear optical clock has triggered a multitude of
experimental and theoretical studies. In particular the prediction of an unprecedented …