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Nature 439, 279 (19 January 2006) | doi:10.1038/439279a; Published online 18 January 2006

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Nuclear physics: Odd couple decays

Juha Äystö1

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The decay of proton-rich nuclei by the emission of a single proton has been known about for some time, and is well understood. The latest observation of two-proton emission, however, will provoke some head-scratching.

On page 298 of this issue1, Mukha and colleagues report the simultaneous emission of two protons from a complex, long-lived state of the silver isotope 94Ag, which has an odd number of protons. This type of radioactive decay is expected only for proton-rich nuclei with an even number of protons — so the observation leaves nuclear physicists with some explaining to do.

  1. Juha Äystö is in the Department of Physics, University of Jyväskylä, Jyväskylä 40351, Finland.
    Email: juha.aysto@phys.jyu.fi

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