Fundamental Physics

Experimental Physics Matter and Antimatter Particle Physics Standard Model Elementary Particles Constants of Nature Research Collaborations Neutrino Research Atomic Transitions Mass States Matter and Universe Timekeeping Quantum Mechanics Dark Matter Research Theories of the Universe

Researchers Drive Thorium-229 Nuclei With Laser Inside Opaque Solid

The result opens nontransparent hosts for nuclear spectroscopy, enabling conversion‑electron detection toward a thorium‑based optical clock.

Electroplated Thorium on Steel Delivers Key Step Toward Compact Nuclear Clocks

JUNO Neutrino Observatory Starts Data Taking After 20,000-Ton Fill

Enhanced Dual-Comb Spectroscopy Reveals Previously Unknown Samarium Transitions

Largest Global Optical Clock Comparison Paves Way to Redefine the Second