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The r-process synthesizes the more neutron-rich of the stable isotopes of even elements, and those separated from the beta-stable isotopes by those that are not often have very low s-process yields and are considered r-only nuclei; the heaviest isotopes of most even elements from zinc to mercury fall into this category. Abundance peaks for the r-process occur near mass numbers 1=''A'' = 82 (elements Se, Br, and Kr), 1=''A'' = 130 (elements Te, I, and Xe) and 1=''A''

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