Thorium Nuclear Clocks: A New Frontier of Precision ⚡ экспресс
Scientists are building ultra-precise clocks powered not by electrons but by the nucleus of a thorium atom. It 'ticks' with extraordinary slowness and stability, but its signal gets scrambled by imperfections in the crystal that holds it. Think of a pendulum on a shaking floor—the lattice tremors drown out the clean beat. Will they manage to quiet this quiver?
Ordinary atomic clocks rely on spectroscopy — counting electron oscillations. Thorium-229 nuclear clocks address the nucleus itself. Its excited state lives for 641 seconds: for nuclear physics, this is a pendulum in thick syrup, where one swing lasts an eternity, but is impeccably stable.
Placing such nuclei in a crystal, physicists face a problem: lattice defects act like an uneven floor, disrupting the rhythm of each pendulum in its own way. The task is to level this floor. Then the clocks will become more accurate: an error of one second over the entire age of the Universe. They will notice the difference in the passage of time between floors and test the Standard Model of physics for strength.
🎯 Thorium-229 is the only nucleus whose transition can be triggered by a regular ultraviolet laser, rather than hazardous gamma radiation. This makes the experiments tabletop and safe.