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Citations




L. P. Gaffney et al. Studies of pear-shaped nuclei using accelerated radioactive beams. Nature. May 9,
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, 2013. doi: 10.1038/nature12073.
[Go to]




Further Reading




T. Siegfried. Atomic anatomy. Science News. Vol. 179, May 7, 2011, p. 30.
[Go to]




A. Grant. Proton’s radius revised downward. Vol. 183,
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, February 23, 2013, p. 8.
[Go to]




Atomic nuclei come in many shapes and sizes, and scientists have now obtained precise measurements of an elusive form: pear-shaped. Studying these exotic nuclei, which are described in the May 9 Nature, could allow physicists to better understand subatomic structure and to find new particles and forces,
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.

“It’s a beautiful, clear-cut result of a very careful experiment,” says Christopher Lister,
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, a physicist at the University of Massachusetts in Lowell.

Diagrams in middle school textbooks depict atomic nuclei as spherical,
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, but the real story is a lot more complex. Protons and neutrons are jam-packed into a space just 10-15 meters wide,
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, held together by a crushing force that dwarfs that of gravity. At the same time,
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, the subatomic particles constantly move, shifting around and sometimes warping the nucleus into the shape of a football or even a flattened disk.

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