U.S.-Korea Cooperative Research on Spin-Isospin Excitation in Nuclei by Tagged Photons

该提案要求获得资金，以允许伦斯勒理工学院物理系Kongki Min博士与首尔国立大学物理系Jong Chan Kim博士进行为期24个月的中能核物理合作研究计划。科学家和他们的研究小组成员将合作研究(伽马，圆周率)反应中的+自旋-同位旋激发，使用单能光子。研究的目的是获得核结构信息，特别是与核激发模式中的自旋和同位旋量子数有关的信息。以前的研究使用的是能量连续分布的光子源，这给所研究的反应截面的确定带来了相当大的不确定性。通过使用高能单色光子(伽马射线)，截面的确定变得更直接，对理论模型的依赖更少。目前，美国还没有运行中的单色光子设施，具有进行光子学实验所需的高能量。因此，合作者将在加拿大萨斯喀彻温省大学的萨斯喀彻温省加速器实验室进行实验。拟议的研究应提供有关原子核基本激发模式的独特信息，并应有助于理解原子核的结构。美国和韩国的合作者都是备受尊敬的科学家，他们在电子和光核物理研究方面有成功的研究记录。本项目将使他们能够将自己的才华和兴趣结合起来，实现互利共赢。该项目与美韩合作科学计划的目标相关，该计划旨在通过交流科学信息、想法、技能和技术以及通过在互利问题上的合作来提高美国和韩国科学家和工程师之间的合作水平。韩国参与该项目得到了韩国科学与工程基金会(KOSEF)的支持。

This proposal requests funds to permit Dr. Kongki Min, Department of Physics, Rensselaer Polytechnic Institute, to pursue with Dr. Jong Chan Kim, Department of Physics, Seoul National University, for 24 months, a program of cooperative research in medium energy nuclear physics. The scientists and members of their research groups will collaborate in a study of + spin-isospin excitations in (gamma,pi ) reactions, using monoenergetic photons. The investigation is directed at obtaining nuclear structure information especially related to the spin and isospin quantum numbers in the nuclear excitation modes. Previous studies have made use of a photon source with a continuous energy distribution, which has introduced rather large uncertainties in the determination of cross sections for the reactions studied. By using high energy monochromatic photons (gamma rays), the determination of cross sections becomes more direct and less dependent on theoretical models. At present, there is no operating monochromatic photon facility in the United States with the high energy needed for photopion experiments. The collaborators, therefore, will perform their experiments at the Saskatchewan Accelerator Laboratory at the University of Saskatchewan, Canada. The proposed research should provide unique information on the basic excitation modes of atomic nuclei and should contribute to the understanding of nuclear structure. The U.S. and Korean collaborators are highly respected scientists who have records of successful research in electro- and photonuclear physics research. The present project will allow them to combine their talents and interests for mutual benefit. This project is relevant to the objectives of the U.S.-Korea Cooperative Science Program which seeks to increase the level of cooperation between U.S. and Korean scientists and engineers through the exchange of scientific information, ideas, skills, and techniques and through collaboration on problems of mutual benefit. Korean participation in the project is supported by the Korea Science and Engineering Foundation (KOSEF).