Category: Default

Detection of low-lying atomic states in actinium

Two lowest-energy odd-parity atomic levels of the radioactive element actinium were observed in a laser-spectroscopy experiment at the Johannes Gutenberg University in Mainz, Germany, resolving a long-standing puzzle of “missing” atomic states predicted by theory. The properties of these states (exact energies, lifetime, and hyperfine structure) were studied by the experimental team and found to […]