Atomic oddity decays like no other

 作者:宰父罢     |      日期:2019-03-15 06:11:01
A CIGAR-SHAPED atom has demonstrated a novel kind of radioactive decay by spitting out two free protons at the same time. Radioactive decay normally involves the emission of one of three types of particle: a helium nucleus consisting of two protons and two neutrons, an electron or a photon. Exotic atoms engineered to contain fewer neutrons than in the atom’s natural state were expected to break down by emitting protons, either one at a time or in pairs. But the two-proton decay had never been seen. Sam Tabor, a nuclear physicist at Florida State University in Tallahassee,