Elementary Excitation Modes Built on Superdeformed High-Spin States

基于超变形高自旋态的基本激发模式

• 批准号: 01540245
• 负责人: MATSUYANAGI Kenichi
• 金额: $ 1.22万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540245/
• 关键词: Superdeformed rotation band; High-Spin State; Yrast Spectroscopy; Octupole Vibration; Cranking Model; Pairing Correlation; Particle-Vibration Coupling; Decoupling Factor; 超変形状態; 巨大共鳴; 回転バンド; 核構造

We have constructed a computer program that can find all solutions of the RPA equations for elementary excitation modes built on superdeformed high-spin states. Using this computer program, we have systematically investigated properties of multipole vibrations, both isoscalar and isovector types, which could be created on superdeformed rotation bands.The most important conclusion of this research is the theoretical prediction that the superdeformed nuclei with axis ratio 2 : 1 could be quite soft against the octupole deformations with the symmetry Y30, Y31 and Y32. Thus, existence of new types of soft vibrational modes having such symmetries are suggested, and the possibility of observing electric dipole transitions associated with them by means of the next generation of gamma-ray detector system has been discussed. The microscopic structure of these new modes and their change in character associated with the increase of the angular momentum of the rotational motion have been investigated in detail.

我们编制了一个计算机程序，可以求出建立在超变形高自旋态上的初等激励模式的RPA方程的所有解。利用这个计算机程序，我们系统地研究了在超变形旋转带上可以产生的多极振动的性质，包括等标量和等矢量类型。本研究最重要的结论是理论预测了轴比为2:1的超变形核对于对称为Y30、Y31和Y32的八极子变形是相当柔软的。因此，提出了具有这种对称性的新型软振动模式的存在性，并讨论了利用下一代伽玛射线探测器系统观测与之相关的电偶极子跃迁的可能性。详细研究了这些新模态的微观结构及其随旋转运动角动量增加而发生的特性变化。

项目成果

Shoujirou Mizutori, Yoshifumi R. Shimizu and Kenichi Matsuyanagi: "Collective Vibrations Built on Superdeformed High-Spin States" "Nuclear Collective Motion and Nuclear Reaction Dynamics", edited by K-I. Kubo, M. Ichimura, M. Ishihara and S. Yamaji. World

Shoujirou Mizutori、Yoshifumi R. Shimizu 和 Kenichi Matsuyanagi：《建立在超变形高自旋态上的集体振动》《核集体运动和核反应动力学》，K-I 编辑。

Shoujirou Mizutori, Yoshifumi R. Shimizu and Kenichi Matsuyanagi: "Soft Octupole Vibrations with K=0 and K*0 Built on Superdeformed Rotation Bands and Static Pairing Correlations" Kyoto University Preprint. KUNS 1057. (1991)

Shoujirou Mizutori、Yoshifumi R. Shimizu 和 Kenichi Matsuyanagi：“基于超变形旋转带和静态配对相关性的 K=0 和 K*0 的软八极振动”京都大学预印本。

Shoujirou Mizutori, Yoshifumi R. Shimizu and Kenichi Matsuyanagi: "Octupole Vibrations Built on Superdeformed Rotation Bands" Prog. Theor. Phys.83. 666-670 (1990)

Shoujirou Mizutori、Yoshifumi R. Shimizu 和 Kenichi Matsuyanagi：“建立在超变形旋转带上的八极振动”Prog。

Shoujirou Mizutori: "Octupole Vibration Built on Superdeformed Rotational Bands" Progress of Theoretical Physics. 83. 666-670 (1990)

水鸟正二郎：“建立在超变形旋转带上的八极振动”理论物理进展。

Shojirou Mizutori: "Soft octupole Vibrations with K=0 and K≠0 Built on Superdeformed Rotation Bands and Static Pairing Correlations" Progress of Theoretical Physics.

Shojirou Mizutori：“基于超变形旋转带和静态配对相关性的 K=0 和 K≠0 的软八极振动”理论物理进展。