| Co-Investigator(Kenkyū-buntansha) |
GELBERG Adrian Universitat zu Koln, Department of Physics, Professor, 物理学教室, 教授
VON Brentano ケルン大学, 物理学教室, 主任教授
MIZUSAKI Takahiro The University of Tokyo, Graduate School of Science, Research Associate, 大学院・理学系研究科, 助手 (50251400)
NAKADA Hitoshi Juntendo University, School of Medicine, Research Associate, 医学部, 助手
SUGITA Michiaki Japan Atomic Energy Research Institute, Researcher, 研究員
YOSHIDA Nobuaki Institute for Physical and Chemical Research, Researcher, 研究員 (80182773)
YOSHINAGA Naotaka Saitama University, College of Liberal Arts, Associate Professor, 教養部, 助教授 (00192427)
ARIMA Akito Hosei University, Faculty of Engineering, Professor, 工学部, 教授 (40011465)
VON Brertano Peter Universitat zu Koln, Department of Physics, Professor
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| Research Abstract |
In this research project, nuclear quadruple 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. We studied the structure of ^<130>Xe, in particular, in order to investigate to what extent the O(6) dynamical symmetry holds in this nucleus. The data taken by Koeln group indicates very clearly the O(6) dynamical symmetry properties. The O(6) dynamical symmetry is a perfect description, but appears to be rather abstract. Otsuka developed a new interpretation of its structure. The O(6) dynamical symmetry can be viewed as the phonon excitation from a deformed equilibrium. With this view, a more intuitive understanding of the structure of gamma-unstable nuclei can be obtained. The quantum chaos has been studied in terms of the rotational damping and the width. The magnetic transitions are enhanced anomalously in the O(6) nuclei, and data taken recently by the Koeln group have been analyzed. The Interacting Boson-Fermion Model - 2 has been used to analyze the Ml excitation data by the Koeln group for odd-A nuclei. The nuclei ^<125,127>Xe 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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