Laser spectroscopy reveals for the first time the precise nuclear shape of fermium-255, offering new clues in the search for superheavy elements
An international research team has, for the first time, precisely determined the nuclear structure of the actinide fermium-255, confirming that its nucleus exhibits a pronounced prolate deformation, similar to a rugby ball. The study, published in *Physical Review Letters*, was conducted in collaboration with 18 institutions, including Johannes Gutenberg University Mainz in Germany, the Helmholtz Institute Mainz, and the University of Gothenburg in Sweden. The findings not only correct several unreasonable nuclear property values in previous standard data tables but also provide crucial experimental validation for modern nuclear theory models. Fermium is a synthetic heavy element that does not exist in nature. Fermium-255 contains 100 protons and 155 neutrons, making its experimental production extremely challenging. The research team...
2026-08-08
