Microscopic Study of Nuclear Collisions in Low and Medium Energy Region

该项目是基于我国在低能和中能核碰撞微观研究方面处于国际领先水平，并产生了许多原创作品的基础上，从1995年到1997年历时三年推进的。项目的代表性课题有(1)重离子碰撞的量子力学微观模拟；(2)不稳定核的反应；(3)宇宙中元素合成的低能核反应的精确计算；(4)核反应的簇模型计算。下面我们将列举在三年中取得重大进展的几个例子。在课题(1)中，反对称分子动力学应用于从质子非弹性预平衡散射到Au+Au重体系的广泛领域，具有良好的数据再现性，并对碎片动力学的理解取得了重大进展。对于课题(2)，复杂标度法显著地推进了对不稳定核共振的研究，而不稳定核聚变的TDHF计算得到了非常有趣的结果，可以与实验进行比较。对于课题(3)，重核的聚变计算变得非常精确，可以从聚变数据中获得光谱信息，并将星系化学演化模型与原子核和粒子理论相结合，在很大程度上提出了独特的元素合成模型。课题(4)提出了利用碎裂反应研究富中子核结构的新思路，并对天体物理反应的聚类模型计算进行了较大的改进。这个项目三年来取得了许多丰硕的成果，这在很大程度上归功于我国理论与实验的结合。同时，该项目对加强理论与实验之间的生产性协作发挥了重要作用。在项目的最后一学年，举办了“核多体问题创新计算方法国际研讨会”国际会议，该研究项目的首席研究员担任联席主席。本次国际会议为实现本研究项目的目标作出了重要贡献。少

This project was advanced for three years from 1995 to 1997 on the basis of our status that the microscopic study of low and medium energy nuclear collisions in our country is internationally at the top level with production of many original works. Erpresentative subjects of the project were (1) quantum mechanical microscopic simulation of heavy ion collisions, (2) reactions of unstable nuclei, (3) accurate calculation of low energy nuclear reactions of element synthesis in the universe, (4) cluster model calculation of nuclear reactions. We below mention a few examples of large progress achieved during three years. For the subject (1), the antisymmetrized molecular dynamics was applied to wide subjects ranging from proton inelastic preequilibrium scattering to the heavy system of Au+Au with good reproduction of data and with giving big progress for the understanding of fragmentation dynamics. For the subject (2), complex scaling method advanced remarkably the study of resonances of un … More stabel nuclei, and TDHF calculations of fusion of unstable nuclei yielded very interesting results to be compared with experiments. For the subject (3), the fusion calculation of heavy nuclei became so precise to get the spectoscopic information from the fusion data, and the unique model on the element synthesis was advanced largely by combining galaxy chemical evolution model with nuclear and particle theory. For the subject (4), a new idea to study neutron rich nuclear structure by fragmentation reaction was proposed, and cluster model calculation of astrophysical reaction was advanced largely. Many fruitful results obtained in these three years under this research project owes largely to the collaboration between theory and experiments in our country. At the same time, this project playd an important role for producing enhanced productive collaboration between theory and experiments. In this final academic year of the project, an international conference "Interntional Symposium on Innovative Computational Methods in Nuclear Many Body Problems"was held, in wihch the head investigator of this reasearch project playd a role of co-chairperson. This international conference made an important contribution to the achievements of the aims of this reasearch project. Less