U.S. France Cooperative Research: Decay of High Lying States Excited in Heavy Ion Reactions

这项为期两年的奖项支持密歇根州立大学国家超导回旋加速器实验室的Gerard M.Crawley和法国奥赛核物理研究所的S.Gales在高能粒子物理方面的美法合作研究。这两个研究小组将对高位单粒子态和巨共振的衰变研究进行联合、互补的实验。通过对粒子衰变的研究，将极大地提高对原子核高位态结构的理解。研究人员将在密歇根州立大学和法国GANIL设施进行以下主题的实验：(1)在重离子转移反应中观察到的高位态的结构；(2)重核中Gamow-Teller和其他态的质子衰变；以及(3)巨型等矢量单极共振的存在和性质。这一合作利用了美国和法国独特的专业知识和设施。密歇根州立大学的国家超导回旋加速器实验室提供了所有实验所必需的高能束流。法国卡昂的GANIL设施由三个相连的回旋加速器、一个独特的光谱仪和中子探测器阵列组成，与法国的专业知识一起可以进行关于巨型共振的复杂实验。

This two-year award supports U.S.-France cooperative research in high energy particle physics between Gerard M. Crawley of the National Superconducting Cyclotron Laboratory at Michigan State University and S. Gales of the Nuclear Physics Institute, Orsay, France. Both research groups will conduct joint, complementary experiments on decay studies of high lying single particle states and giant resonances. The understanding of the structure of high lying states in the nucleus will be enhanced significantly through studies on particle decay. The investigators will conduct experiments at Michigan State University and at GANIL facility in France on the following topics: (1) structure of high lying states observed in heavy ion transfer reactions; (2) proton decay of Gamow-Teller and other states in heavy nuclei; and (3) the existence and properties of the giant isovector monopole resonance. This cooperation takes advantage of unique U.S. and French expertise and facilities. High beam energies, which are necessary for all of the experiments, are available at Michigan State's National Superconducting Cyclotron Laboratory. The GANIL facilities in Caen, France, composed of three connected cyclotrons, a unique spectrometer, and neutron detector array, are available together with French expertise, to carry out the complex experiment on giant resonances.