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

Journal Article · Tue Jun 01 04:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3455974· OSTI ID:21362138

Otsuka, Takaharu ^[1]

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1. Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)

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 V{sub lowk} and the Q{sub box} 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 {sup 28}O to the experimentally observed {sup 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.

• OSTI ID: 21362138
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1238; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON-BARYON INTERACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LIGHT NUCLEI
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MILLISECONDS LIVING RADIOISOTOPES
MONOPOLES
NEUTRON-RICH ISOTOPES
NEUTRONS
NUCLEAR FORCES
NUCLEAR MODELS
NUCLEI
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
OXYGEN 24
OXYGEN 28
OXYGEN ISOTOPES
PARTICLE INTERACTIONS
POLARIZATION
RADIOISOTOPES
SHELL MODELS
TENSOR FORCES
THREE-BODY PROBLEM