Impact of pear-shaped fission fragments on mass-asymmetric fission in actinides

Journal: Nature

Published: 2018-12-19

DOI: 10.1038/s41586-018-0780-0

Affiliations: 3

Authors: 2

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Research Highlight

Going pear shaped

© KTSDESIGN/SCIENCE PHOTO LIBRARY/Getty

© KTSDESIGN/SCIENCE PHOTO LIBRARY/Getty

The greater stability of pear-shaped nuclei can partially explain why large atomic nuclei split unevenly into a large and a small daughter nucleus, two nuclear physicists have found.

In nuclear power stations, large atomic nuclei such as uranium break into two smaller nuclei, releasing energy in the process. Interestingly, the two daughter nuclei don’t have similar masses: one is considerably bigger than the other. Physicists have long wanted to understand the factors that determine the relative masses of the daughter nuclei.

Now, a researcher from Tsukuba University in Japan and his collaborator have performed calculations that show that pear-shaped daughter nuclei preferentially form due to the strong repulsion generated by the electrical charge of the two fragments. This finding will help refine models of the nucleus and improve predictions of fission products.

Supported content

  1. Nature 564, 382–385 (2018). doi: 10.1038/s41586-018-0780-0
Institutions FC
Center for Computational Sciences (CCS), University of Tsukuba, Japan 0.50
ANU Department of Nuclear Physics, Australia 0.25
ANU Department of Theoretical Physics, Australia 0.25

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