For most atomic nuclei, the maximum number of neutrons that can be bound is unknown. The discovery of two neutron-rich nuclei — and the confirmed absence of others — might help solve this conundrum.
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Heenen, PH. Neutrons cross the line. Nature 449, 992–993 (2007). https://doi.org/10.1038/449992a
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DOI: https://doi.org/10.1038/449992a