Are Protons Leaving in Pairs?

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Science  09 Feb 2001:
Vol. 291, Issue 5506, pp. 995-997
DOI: 10.1126/science.1059051

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Proton decay is an exotic type of radioactivity that is only observed in certain types of highly unstable nuclei. As Woods explains in his Perspective, physicists are now hot on the trail of another, even more unusual type of radioactivity, in which two protons are emitted during the decay of a nucleus. This effect was predicted about 40 years ago, but it is only now that experimental data are beginning to yield a consistent picture of such radioactive decay.