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Nature 449, 992-993 (25 October 2007) | doi:10.1038/449992a; Published online 24 October 2007

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Nuclear physics: Neutrons cross the line

Paul-Henri Heenen1

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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.

Stars are element factories. Every atom in the Universe is a product of stellar nuclear reactions, but many of the stable isotopes that predominate today have formed from nuclei that existed only fleetingly.

  1. Paul-Henri Heenen is at the Université Libre de Bruxelles, Physique Nucléaire Théorique et Physique Mathématique, CP 229, 50 Avenue F. D. Roosevelt, Brussels B1050, Belgium.
    Email: phheenen@ulb.ac.be

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