A particle smasher has created antihyperhelium-4, the heaviest antimatter nucleus ever made in a physics lab Duncan Walker/Getty Images
Another antimatter record has been broken. In the smash-up of very energetic lead ions, researchers have uncovered evidence of the heaviest antimatter version of an atomic nucleus ever seen.
In 2024, researchers from the STAR Collaboration at Brookhaven National Laboratory’s Relativistic Heavy Ion Collider (RHIC) in New York reported briefly creating a then unprecedentedly heavy antimatter nucleus called antihyperhydrogen-4. Many particles have antimatter equivalents that are identical but with opposite charges, and these antiparticles can combine into larger antimatter…
