Electromagnetic Moments of Exotic Na Isotopes and Their Relation to the N = 20 Shell Gap

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概要

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• Electromagnetic moments of Na isotopes have been systematically calculated by large-scale shell-model calculations based on the Monte Carlo shell model (MCSM). This systematic calculation clarifies the transition from the normal-dominant (i.e., 0p0h) ground state to the intruder-dominant (2p2h) one, and is helpful to examine the mechanism of the disappearance of the magic structure in neutron-rich nuclei. The MCSM succeeded in describing those magnetic and quadrupole moments. Comparison between the calculation and experiment shows that the normal and the intruder configurations are well mixed at N = 18 and that the intruder configurations dominate the ground state at N = 19. It turns out that these features are quite sensitive to the effective single-particle energy of the 0d_3/2 orbit. As a result, the effective N =20 shell gap, affected by the two-body monopole interaction, must be much narrower than that of stable nuclei to reproduce the ground states of Na isotopes. This narrowing is caused by strong T =0 monopole interaction between j_> = l + 1/2 and j_< = l - 1/2 orbits proposed recently, which can constitute a unified picture about formation and disappearance of the magic number.

• 2002-12-26

著者

• Mizusaki T

  Institute Of Natural Sciences Senshu University

• OTSUKA Takaharu

  Department of Physics, University of Tokyo

• Utsuno Yutaka

  Japan Atomic Energy Research Institute

• 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

• HONMA MICHIO

  Center for Mathematical Sciences, University of Aizu

• MIZUSAKI TAKAHIRO

  Institute of Natural Sciences, Senshu University

• Honma M

  Center For Mathematical Sciences University Of Aizu

• Honma Michio

  Center For Mathematical Sciences The University Of Aizu

• 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

• MIZUSAKI Takahiro

  Institute for Natural Sciences, Senshu University

• OTSUKA Takaharu

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

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