Near the beginning of time, the universe almost certainly contained many elements heavier than uranium, the heaviest element that exists naturally on earth. Gradually these “transuranium” elements ...

The hyperfine structure of radium monofluoride has been measured by researchers in the US and elsewhere with such precision ...

Computer simulation of a grain boundary (green) in uranium oxide. Uranium atoms are yellow, oxygen atoms are red. These simulations are helping researchers understand how hydrogen interacts with ...

Though the country’s nuclear arsenal has undergone no explosive testing for decades, federal experts say it can reliably ...