Shell evolution and existence limit of exotic nuclei and the nuclear force

Details Shell evolution and existence limit of exotic nuclei and the nuclear force Shell evolution and existence limit of exotic nuclei and the nuclear force

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1238...44o&link_type=abstract

TOURS SYMPOSIUM ON NUCLEAR PHYSICS AND ASTROPHYSICS-VII. AIP Conference Proceedings, Volume 1238, pp. 44-51 (2010).

Physics

Nuclear Physics

Nucleon-Nucleon Interactions, Nuclear Forces, Neutrons, Polarization, Nucleon-Nucleon Interactions, Three-Nucleon Forces, Mass And Neutron Distributions, Polarization Phenomena In Reactions

Scientific paper

Novel simple properties of the monopole component of the effective nucleon-nucleon interaction are presented in the first half of this talk, leading to the so-called monopole-based universal interaction. Shell structures are shown to change as functions of N and Z consistently with experiments. Some key cases of this shell evolution are discussed, clarifying the effects of central and tensor forces. The validity of the present tensor force is examined in terms of the low-momentum interaction Vlowk and the Qbox formalism. In the second half of this talk, I discuss effects of the three-body force in exotic nuclei. 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 28O to the experimentally observed 24O. 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.

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