Shell, Shape and Spin / Isospin Structures of Exotic Nuclei

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概要

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• In conclusion, we showed how magic numbers are changed in nuclei far from the β-stability line: N=6, 16, 34, etc., can become magic numbers in neutron-rich exotic nuclei, while usual magic numbers, N=8, 20, 40, etc., may disappear. Since such changes occur as results of the nuclear force, there is isospin symmetry that similar changes occur for the same Z values in mirror nuclei. The mechanism of this change can be explained by the strong V_τσ interaction which has robust origins in OBEP, G-matrix and QCD. In fact, simple structure such as magic numbers should have a simple and sound basis. Since it is unlikely that a mean central potential can simulate most effects of V_τσ, we should treat V_τσ rather explicitly. It is nice to build a bridge between very basic feature of exotic nuclei and the basic theory of hadrons, QCD. Loose-binding or continuum effects are important in some exotic nuclei. By combining such effects with those discussed in this talk one may draw a more complete picture for the structure of exotic nuclei. Finally, I mention once again that the nuclear shell structure can be changed due to the nucleon-nucleon interaction, even in exotic nuclei not close to the drip line. Note that there are rather many nuclei between the β-stability line and the drip lines. I would like to emphasize that, at least, the spin-isospin dependent interaction discussed in this talk should produce large, simple and robust effects for changing the shell structure (and the magic numbers). Including other possible origins, I would like to propose that the structure of stable and exotic nuclei should be studied with the paradigm of shell evolution where the shell structure (and magic numbers) can vary significantly as results of variable contributions of nucleon-nucleon interaction and many-body dynamics, depending on Z and N. A variety of intriguing properties of exotic nuclei can then be studied in a rather unified or organized perspective. This paradigm may be related to stable nuclei as well, because the nuclear force is common between stable and unstable nuclei but certain aspects of the force can be better clarified by the study of exotic nuclei. For instance, a proper treatment of V_τσ-type interaction, which is needed to understand and/or predict the variation of magic numbers in exotic nuclei, may lead us to more precise description of spin-isospin properties, for instance, Gamov-Teller transitions and magnetic moments of stable/exotic nuclei.

• 理論物理学刊行会の論文
• 2002-12-26

著者

• Otsuka T

  Department Of Physics And Center For Nuclear Study University Of Tokyo:riken

• Otsuka Takaharu

  Department Of Physics And Center For Nuclear Studies University Of Tokyo:riken Hirosawa

• Otsuka Takaharu

  Department Of Physics And Center For Nuclear Study (cns) University Of Tokyo:riken

• OTSUKA Takaharu

  Department of Physics and Center for Nuclear Study (CNS), University of Tokyo:RIKEN

• OTSUKA Takaharu

  Department of Physics, University of Tokyo:Center for Nuclear Study, University of Tokyo:RIKEN

• OTSUKA Takaharu

  Department of Physics, University of Tokyo:The Institute of Physical and Chemical Research (RIKEN)

関連論文

• Generation of lrreducible Representations in the O(6) Limit of the IBM : Nuclear Physics
• The Exotic Clustering and Nucleon-Nucleon Correlations in Light Neutron-Rich Nuclei
• Exotic Cluster Shapes in Neutron-Rich Be and C Isotopes
• The Exotic Clustering and Nucleon-Nucleon Correlations in Light Neutron-Rich Nuclei
• Exotic reaction mechanism in heavy ion collision(International Workshop on Nuclear Structure-New Pictures in the Extended Isospin Space(NS07)-)
• Spectra of Neutrons Emitted from Excited/Ground States of ^24,25O
• Spectra of Neutrons Emitted from Excited/Ground States of ^O
• Electromagnetic Moments of Exotic Na Isotopes and Their Relation to the N = 20 Shell Gap
• Electromagnetic Moments of Exotic Na Isotopes and Their Relation to the N-20 Shell Gap
• A Workstation Farm Optimized for Monte Carlo Shell Model Calculations : Alphleet
• Monte Carlo Shell Model Calculations for Atomic Nuclei and Their Parallel Computing
• Magnetic properties of light neutron-rich nuclei(International Workshop on Nuclear Structure-New Pictures in the Extended Isospin Space(NS07)-)
• Investigation of tensor-force effect on exotic nuclei by the Hartree-Fock-Bogoliubov method(International Workshop on Nuclear Structure-New Pictures in the Extended Isospin Space(NS07)-)
• Possible development of N=34 shell gap in neutron-rich pf-shell nuclei(International Workshop on Nuclear Structure-New Pictures in the Extended Isospin Space(NS07)-)
• Superdeformation in the Hg-Pb Region and an Extension of IBM
• Relativistic Mean Field Models and Nucleon-Nucleon Interactions(Nuclear Physics)
• Ground State Properties with a Random Two-Body Interaction(Nuclear Physics)
• Microscopic Calculations for O(6) Nuclei by the Interacting Boson Model
• Molecular states of carbon isotopes(International Workshop on Nuclear Structure-New Pictures in the Extended Isospin Space(NS07)-)
• Variational Shell Model for Light Exotic Nuclei (原子核集団ダイナミックスの新動向)
• Single Particle Potential Far from Stability (不安定核の構造と反応)
• Structure of Unstable Nuclei Studied with Number-Projected HFB Calculation
• Single Particle Properties of Nuclei on and beyond the Drip Line
• Halo Structure of ^Li and Gamow-Teller Transitions to ^Be
• Shell, Shape and Spin / Isospin Structures of Exotic Nuclei
• Microscopic Basis of the Interacting Boson Model
• Gamow-Teller Strengths in Ni Isotopes and Nuclear Weak Processes(YKIS2011 papers, Frontier Issues in Physics of Exotic Nuclei)
• Shell Evolution around and beyond N = 28 Studied with Large-Scale Shell-Model Calculations(YKIS2011 papers, Frontier Issues in Physics of Exotic Nuclei)
• Monte Carlo Shell Model Calculations for Atomic Nuclei and Their Parallel Compting
• Structure of Unstable Nuclei Studied with Number-Projected HFB Calculation
• Gamow-Teller Strengths in Ni Isotopes and Nuclear Weak Processes

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