| Project/Area Number |
06044249
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| Research Category |
Grant-in-Aid for Overseas Scientific Survey.
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| Allocation Type | Single-year Grants |
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| Research Institution | The University of Tokyo |
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Principal Investigator |
OTSUKA Takaharu The University of Tokyo, Graduate School of Science, Associate Professor, 大学院理学系研究科, 助教授 (20201379)
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| Co-Investigator(Kenkyū-buntansha) |
GELBERG Adrian Universitat zu Koln, Department of Physics, Professor, 物理学教室, 主任教授
BRENTANO Pet ケルン大学, 物理学教室, 主任教授
HONMA Micio The University of Aizu, Center for Mathematical Sciences, Instructor, 総合数理科学センター, 講師 (40264569)
MIZUSAKI Takahiro The University of Tokyo, Graduate School of Science, Research Associate, 大学院理学系研究科, 助手 (50251400)
SUGITA Michiaki Japan Atomic Energy Research Institute, Researcher, 研究員
YOSHIDA Nobuaki Kansai University, Faculty of Informatics, Professor, 総合情報学部, 教授 (80182773)
YOSHINAGA Naotaka Saitama University, College of Liberal Arts, Associate Professor, 教養部, 助教授 (00192427)
ARIMA Akito The Institute of Physical and Chemical Research, The Chief Director, 理事長 (40011465)
VON BRENTANO Peter Universitat zu Koln, Department of Physics, Professor
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| Project Period (FY) |
1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Keywords | Interacting Boson Model / phonon / rotational damping / g-factor / Pd / Xe / Cs / Cs |
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| Research Abstract |
In this research project, nuclear quadrupole and octupole deformations have been studied from various new aspects, including both dynamical and static deformations. The theoretical tool we have used is the Interacting Boson Model (IBM). The gamma-unstable deformation is known for Xe and Ba nuclei with the mass number -130, and is described by the O (6) limit of the IBM.The O (6) limit has been considered, in a classical term, as a gamma-unstable rotor. We, however, discovered an alternative picture where all eigenstates of the O (6) limit can be constructed as multiphonon states. This new approach is called the Q-phonon scheme. The phonons are excited on the top of a deformed equilibrium in this scheme. This scheme looks quite powerful in describing states even away from the O (6) limit. For instance, yrast odd-spin states can be described as Q-phonon states except for a singular point. The quantum chaos has been further studied in terms of the rotational damping and the width. We obtained a reasonable estimate of the width, and discussed branching numbers, etc. The octupole deformation has been studied with particular attention to the electric dipole transitions. The Interacting Boson-Fermion Model-2 has been used to analyze the g factors and M1 excitaion with respect to even-even Pd isotopes and odd-A rare-earth nuclei. Several odd-A Xe-Cs nuclei have been studied in terms of the Interacting Boson-Fermion Model-2, and a good agreement between experiment and calculation has been obtained.
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