Hadron Many-Body Systems and Quark Many-Body Systems

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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.