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Chaos and damped collective motions in highly excited nuclei

高度激发核中的混沌和阻尼集体运动

基本信息

批准号：
10640267
负责人：
MATSUO Masayuki
金额：
$ 0.32万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

In the present research, we investigated the damping of rotational motion in nuclei at very high spin and at finite but moderate temperature. Especially, we focused on studies to clarify a relation between the rotational damping phenomena and the formation of compound states, which is one of the most basic features in the highly excited nuclei.The compound damping width is a dynamical measure of complexity of the wavefunctions of highly excited levels. We clarified that this quantity emerges as a two-component structure in the energy correlation spectra of quasi-continuum gamma rays associated with the damped rotational motion. This points out for the first time a possibility of probing the compound damping width in the experiments.We also studied the systematics of the rotational damping phenomena, clarifying a significant mass number dependence associated with a shell structure effect. An analysis of recent experimental data is also performed.A new method is proposed to analyze in a general manner fluctuations and fine structures in the strength function associated with the damped collective motions. For this purpose, we introduced a new concept of the local scaling dimension, and demonstrated its applicability for some examples.

在本研究中，我们研究了在极高自旋和有限但中等温度下原子核中旋转运动的衰减。特别是，我们重点研究了转动阻尼现象与复合态形成之间的关系，复合态是高激发态中最基本的特征之一，复合阻尼宽度是高激发能级波函数复杂性的动力学度量。我们阐明了这个量在准连续伽马射线的能量相关谱中以双分量结构的形式出现，这些伽马射线与有阻尼性的旋转运动有关。这首次指出了在实验中探索复合阻尼宽度的可能性。我们还研究了旋转阻尼现象的系统学，阐明了与壳层结构效应有关的显著的质量数依赖关系。文中还对最近的实验数据进行了分析，提出了一种新的方法来分析与阻尼集体运动有关的强度函数中的起伏和精细结构。为此，我们引入了局部标度维的新概念，并举例说明了它的适用性。