Microscopic Study of Nuclear Collisions in Low and Medium Energy Region

该项目是根据我国在中低能核碰撞微观研究方面处于国际领先水平，并有多项原创性成果的情况，从1995年至1997年连续三年推进的。该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）不稳定核反应，（3）宇宙中元素合成低能核反应的精确计算，（4）核反应的集团模型计算。我们在下面列举几个例子，说明三年来取得的重大进展。对于课题（1），反对称化分子动力学被广泛地应用于从质子非弹性预平衡散射到Au+Au重体系的研究，数据重现性好，对碎裂动力学的理解有很大的进展。对于问题（2），复标度法显著地推进了对非线性系统共振的研究。 关于我们 稳定核和不稳定核聚变的TDHF计算得到了非常有趣的结果与实验进行了比较。在课题（3）中，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核理论和粒子理论相结合，大大推进了元素合成的独特模型。在课题（4）中，提出了用碎裂反应研究丰中子核结构的新思路，大大推进了天体物理反应的团簇模型计算。在这三年中，该研究项目所取得的许多丰硕成果在很大程度上归功于我国理论与实验的合作。同时，该项目对加强理论与实验之间的有效合作起到了重要作用。在该项目的最后一个学年，举行了一次国际会议“创新计算方法在核多体问题的国际研讨会“，在whihch的这个再研究项目的首席研究员发挥了共同主席的作用。这次国际会议为实现这一重建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