Molecular Structure with Exotic Clusters in Light Neutron-Rich Nuclei

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概要

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• In summary, we have studied the structure of the excited states of ^12Be, ^14Be and ^15B with variation after spin-parity projection based on the framework of AMD method. We have also reported our recent study of shape coexistence problems in ^36Ar and ^40Ca with a constraint AMD. We have obtained a variety of exotic structures concerning with clustering. Various clustering structures in the excited states have been found in the theoretical results in which we have succeeded to reproduce well the excitation energies of many levels of ^12Be. The breaking of the neuron magic number N = 8 in ^12Be has been found. The recently measured excited states are described by the third K^π = 0^+_3 band which has a foreign clustering structure with developed ^6He and ^6He clusters. Exotic clustering structures such as ^8He+^6He and ^9Li+^6He have been predicted in ^14Be and ^15B, respectively. The formation of the remarkable ^6He clusters can be understood by a unique idea of the new type correlation among 4 neutrons in sd-shell and 2 protons in p-shell. This is the first full microscopic calculation which shows the exotic clustering in the excited states of ^12Be, ^14Be and ^15B. The results suggest an important feature that the exotic clustering structures may exist very often in the excited states of neutron-rich nuclei. Structures of ^36Ar and ^40Ca have been studied. In the results it is suggest that many kinds of shapes coexist in these nuclei. In ^40Ca, the spherical ground state, the normal prolate state, the oblate shape, and the prolately super deformation have been found. The prolate state and oblate state are dominated by 4hw configurations, while the super deformation originates from 8hw configurations. It is surprising that the rotational bands made of such highly excited configurations start at low excitation energies. The rotational band of the super deformation corresponds to the experimentally measured band which were observed recently in γ ray transitions. In the theoretically obtained intrinsic states, very strange shapes are predicted in the excited states. It is very interesting that parity asymmetric shape like a pear is proposed in the super deformation. Although the negative parity bands have not been confirmed experimentally yet, present results predict that the parity doublet band with negative parity may exist at about 3 MeV higher than the positive parity band. If we vary the system from ^40Ca to ^32Mg by decreasing the proton number, how do the structures of the excited states of stable nuclei change? Does the excited state with 4p-4h in the neutron shell appear in ^32Mg ? It is a very interesting subject to study structures of intruder states in neutron-rich nuclei associating with the excited of stable nuclei.

• 理論物理学刊行会の論文
• 2002-12-26

著者

• Kanada‐en'yo Y

  Institute Of Particle And Nuclear Studies High Energy Accelerator Research Organization

• KANADA-EN'YO Yoshiko

  Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization

• Kanada-En′yo Yoshiko

  Department of Physics, Kyoto University

関連論文

• Clustering in Yrast States of ^Ne Studied with Antisymmetrized Molecular Dynamics
• Molecular Structure with Exotic Clusters in Light Neutron-Rich Nuclei

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