After scientists created oxygen-28 in the lab, it almost immediately degraded, baffling physicists around the world.
For the first time, scientists have created oxygen-28, a rare oxygen isotope that has 12 more neutrons than oxygen-16, the most common form of oxygen on the planet. This newly created"heavy" oxygen isotope has the highest number of neutrons ever seen in an oxygen atom and was expected to be ultrastable and last virtually forever.
"It opens a very, very big fundamental question about nature's strongest interaction, the nuclear strong force," Rituparna Kanungo, a physicist at Saint Mary's University in Canada who was not involved with the experiment, told New Scientist. To create oxygen-28, a team led by researchers at the Tokyo Institute of Technology blasted a beam of fluorine-29 — an isotope that has nine protons — at a liquid-hydrogen target at the Riken RI Beam Factory in Wako, Japan.
During the experiment, the oxygen-28 molecule decayed within a zeptosecond, or a trillionth of a billionth of a second. In fact, its presence was only confirmed by the products it left behind when it decayed: oxygen-24 and four neutrons. Though the experiment has not yet been replicated, the findings of this study suggest that the current list of magic numbers may not tell the full story of whether molecules are stable. In a separate case, scientists in 2009 showed that an oxygen-24 isotope behaved as though it were doubly magic, even though it did not have a magic number of protons and neutrons.
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