U.S.-Brazil Cooperative Research: Inelastic Electron Scattering by Atomic and Diatomic Targets

该奖项支持由洛斯阿拉莫斯国家实验室的David Cartwright、George Csanak和Robert Clark以及巴西坎皮纳斯Unicamp的Gilda Meneses和Luis Machado在理论物理方面进行的合作研究。主题是研究原子和双原子靶的非弹性电子散射。它们将一阶多体理论和扭曲波近似推广到电子碰撞对稀有气体和碱土原子的激发。这些计算将在O、N和F原子等开放壳层目标上进行。此外，同样的技术将应用于双原子分子目标的计算。最后，我们将用二阶多体理论来处理氦原子的非弹性和弹性电子散射。这些理论技术是在LANL和Unicamp之前的三次合作中历时九年开发出来的。这项工作将把这两个小组的理论和计算能力扩展到等离子体物理中更复杂的过程。这两个实验室的其他一些科学家将参与这项工作，其中包括几名学生。过去的合作已经在国际会议上产生了7个研究生学位和15篇论文。

This award supports cooperative research in theoretical physics to be conducted by David Cartwright, George Csanak and Robert Clark of Los Alamos National Laboratory and Gilda Meneses and Luis Machado of Unicamp in Campinas, Brazil. The topic is the study of inelastic electron scattering by atomic and diatomic targets. They will extend first-order many-body theory and the distorted wave approximation to the excitation of rare-gas and alkaline earth atoms by electron impact. These calculations will be perfomed on open shell targets such as atomic O, N, and F. In addition, the same techniques will be applied to calculations for diatomic molecular targets. Finally, second-order many-body theory will be used to treat both inelastic and elastic electron scattering by helium atoms. These theoretical techniques have been developed over nine years and three previous collaborations between LANL and Unicamp. This work will extend the theoretical and computational capabilities of both groups to more compicated processes of interest in plasma physics. A number of other scientists in both laboratories will be involved in the work including several students. The past cooperation has resulted in seven graduate degrees and fifteen papers at international conferences.