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Hadron Many-Body Systems and Quark Many-Body Systems

强子多体系统和夸克多体系统

基本信息

批准号：
60302018
负责人：
TAMAGAKI Ryozo
金额：
$ 6.21万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

In the studies of strongly interacting many-body systems, it is important to take into consideration two facets, hadronic and quark-composite, and to clarify their complementary roles. We have put emphasis on this point as a common standpoint of the subject, in addition to the studies of the individual themes. The main achievements are as follows: 1. Baryonic structure; in the chiral bag model, the effects of vector mesons and of the vacuum inside the bag have been clarified and the relation to the Skyrme model has been shown. 2. Nuclear forces; the quark-cluster model has been developed to include the strangeness degress of freedom and to study the quark-exchange effects in nuclei. Descriptions in the Skyrme model and the chiral-bag model have been developed. 3. Relativistic and exchange current effects in nuclei; in the studies describing nuclei as the baryon-meson system, a framework has been developed by taking into account relativistic effects including negative energy states and also a microscopic formulation to unifiedly treat nuclear forces and exchange currents has been successfully applied to electron disintegration of deuteron. 4. Various phases of nuclear matter; a new model of pion-condensed neutron stars has been succesfully applied to neutron star phenomena such as cooling, glitches and neutrino bursts. Nuclear matter theory at finite temperature has been developed by keeping in mind on neutron-star formation stage and high-energy nuclear collisions. 5. High-energy nucleus-nucleus collisions; a new cascade model has been succesfully applied to reproduce the existing data in the sub-GeV region and a possible explanation of stopping power has been made in a modified Glauber approximation. 6. Hypernucleus; further development of theoretical analyses on production, structure and decay of hypernuclei has been made, especially in reproducing the existing ^9_ Be data and proposing a new model for ^9_ Be.

在强相互作用多体系统的研究中，重要的是要考虑强子和夸克复合两个方面，并阐明它们的互补作用。除了个别主题的研究之外，我们还强调这一点，作为该主题的共同立场。主要研究成果如下：1.重子结构;在手征袋模型中，阐明了矢量介子和袋内真空的影响，并指出了与Skyrme模型的关系。2.核力量;夸克团模型已发展到包括奇异自由度和研究核中的夸克交换效应。在Skyrme模型和手征袋模型的描述已经发展。3.原子核中的相对论效应和交换流效应：在把原子核描述为重子-介子系统的研究中，发展了一个考虑包括负能态在内的相对论效应的框架，并成功地将一个统一处理核力和交换流的微观表述应用于氘核的电子衰变。4.核物质的各种相态;一个新的π介子凝聚中子星模型已成功地应用于中子星星现象，如冷却，毛刺和中微子爆发。有限温度下的核物质理论是从中子星形成阶段和高能核碰撞的角度发展起来的。5.高能核-核碰撞;一个新的级联模型已成功地应用于再现现有的数据在sub-GeV区域和一个可能的解释阻止功率已在修改的Glauber近似。6.超核;对超核的产生、结构和衰变的理论分析有了进一步的发展，特别是在再现已有的^9_ Be数据和提出新的^9_ Be模型方面。