Investigation into the properties and structure of unstable nuclei far from stability is a key
avenue of research in modern nuclear physics. These efforts are motivated by the continual …

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 last decade has seen unprecedented effort in dark matter model building at all mass
scales coupled with the design of numerous new detection strategies. Transformative …

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 …

We present a measurement of the low-energy (0–60 keV) γ-ray spectrum produced in the α
decay of U 233 using a dedicated cryogenic magnetic microcalorimeter. The energy …

Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a
wide range of scientific discoveries in the areas of fundamental symmetries, astrophysics …

Resonant oscillators with stable frequencies and large quality factors help us to keep track of
time with high precision. Examples range from quartz crystal oscillators in wristwatches to …

Abstract The radioisotope thorium-229 (229Th) is renowned for its extraordinarily low-
energy, long-lived nuclear first-excited state. This isomeric state can be excited by vacuum …

The radionuclide thorium-229 features an isomer with an exceptionally low excitation energy
that enables direct laser manipulation of nuclear states. It constitutes one of the leading …

Optical atomic clocks, use electronic energy levels to precisely keep track of time. A clock
based on nuclear energy levels promises a next-generation platform for precision metrology …