Three-body forces and the limit of oxygen isotopes

Abstract

The limit of neutron-rich nuclei, the neutron drip-line, evolves regularly from light to medium-mass nuclei except for a striking anomaly in the oxygen isotopes. This anomaly is not reproduced in shell-model calculations derived from microscopic two-nucleon forces. Here, we present the first microscopic explanation of the oxygen anomaly based on three-nucleon forces that have been established in few-body systems. This leads to repulsive contributions to the interactions among excess neutrons that change the location of the neutron drip-line from ${}^{28}$O to the experimentally observed ${}^{24}$O. Since the mechanism is robust and general, our findings impact the prediction of the most neutron-rich nuclei and the synthesis of heavy elements in neutron-rich environments.

4 pages, 4 figures, to be published in PRL

References in corpus (7)

• Novel features of nuclear forces and shell evolution in exotic nuclei
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• Coupled-cluster theory for three-body Hamiltonians
• Low-momentum interactions with smooth cutoffs
• Ab-initio computation of neutron-rich oxygen isotopes
• Neutron matter at finite temperature
• Gamow shell-model calculations of drip-line oxygen isotopes

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