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发表于 13-1-2008 04:33 PM
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118号元素被发现
Scientists discover element 118 Colliding ions create the heaviest element yet found.
Francis Reddy
October 16, 2006
Scientists from California's Lawrence Livermore National Laboratory (LLNL) and the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, have discovered element 118. "From the three atoms that we found, the average lifetime of 118 is 0.9 milliseconds," says LLNL team member Dawn Shaughnessy. That's too short for scientists to study the new element's chemical properties, but the superheavy atom sits directly beneath radon on the periodic table. It's in the same family as helium and neon.
The researchers first saw a single element 118 atom in 2002, but the evidence wasn't conclusive. Between February and June 2005, in experiments conducted at the JINR U400 cyclotron, the researchers observed a tell-tale chain of decaying atoms that establishes the element's existence. "There is only a small probability that what we've seen is due to random events," says LLNL team member Nancy Stoyer. "We're very confident." |
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