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Thielemann, Origin of the heaviest elements: The rapid neutron-capture process, Reviews of Modern Physics, 2021","review_link":"https://doi.org/10.1103/RevModPhys.93.015002","review_verified":"true","summary":"About half of the atoms of elements heavier than iron, and nearly all of the gold and uranium, form when nuclei absorb neutrons faster than they can decay, the r-process. 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