U.S.-Japan Cooperative Science: Collision Dynamics of Nuclei with High Isospin Asymmetry

0124186 Tsang该奖项支持密歇根州立大学的ManYee B Tsang教授和日本东北大学的Akira Ono教授之间为期两年的合作研究项目。 研究人员将对具有高同位旋不对称性的原子核的碰撞动力学进行研究。 该项目的重点是核多重碎裂的理论解释，这一过程可能有助于深入了解核物质的液-气相变和非对称核物质的状态方程。 第一个目标是研究对称能在重离子碰撞中产生同位素的作用。 第二个目标将是发展运输方程，准确地描述同位素产量，并比较这些方程的预测，以各种各样的实验数据产生的中心碰撞。 第三个目标是分离实验信号，特别是敏感的非平衡方面的多碎片打破。 在后一项工作中，将包括对诸如颈部碎裂等过程的研究，预计这些过程对反应动力学和碎片形成之间的相互作用相当敏感。 该项目汇集了两个具有互补专业知识和研究能力的实验室的努力。日本科学家率先开发了反对称分子动力学（AMD）模型，美国科学家在玻尔兹曼-乌林-乌伦贝克（BUU）输运方程的开发方面具有专业知识。 预计该研究将有助于量子反应模型的发展。通过交流思想和技术，该项目将扩大我们的基础知识，促进国际理解与合作。 该项目通过一名博士后和一名研究生的参与促进国际人力资源。 研究人员计划在科学期刊上发表研究结果，并在科学会议上报告研究结果。

0124186TsangThis award supports a two-year collaborative research project between Professor ManYee B Tsang at Michigan State University and Professor Akira Ono of Tohoku University in Japan. The researchers will undertake a study of collision dynamics of nuclei with high isospin asymmetry. The focus of this project is the theoretical interpretation of nuclear multifragmentation, a process that may provide insight into the liquid-gas phase transition of nuclear matter and the equation of the state of asymmetric nuclear matter. The first goal will be to study the role of symmetry energy in the production of isotopes in heavy ion collisions. The second goal will be to develop transport equations that accurately describe the isotopic yields and to compare the predictions of these equations to a wide variety of experimental data produced in central collisions. The third goal is to isolate experimental signals that are especially sensitive to the non-equilibrium aspects of the multifragment break up. Included in this latter effort will be the study of processes such as the neck fragmentation, for example, that are expected to be rather sensitive to the interplay between reaction dynamics and fragment formation. The project brings together the efforts of two laboratories that have complementary expertise and research capabilities. The Japanese scientists pioneered the development of the Antisymmetrized Molecular Dynamics (AMD) Model and the U.S. scientists have expertise in the development of Boltzmann-Uehling-Uhlenbeck (BUU) transport equations. It is anticipated that the research will benefit the development of quantal reaction models. Through the exchange of ideas and technology, this project will broaden our base of basic knowledge and promote international understanding and cooperation. The project advances international human resources through the participation of a postdoc and a graduate student. The researchers plan to publish results of the research in scientific journals and report on the findings at scientific meetings.