Collaborative Research: Hyperspherical Hidden Crossing Method Applied to Positron-Alkali and Positron-Hydrogen Collisions at Low Energies

合作研究：低能正电子碱和正电子氢碰撞中的超球形隐交叉法

• 批准号: 0440565
• 负责人: Sandra Ward
• 金额: $ 15.16万
• 依托单位: University of North Texas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-11-15 至 2008-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0440565&HistoricalAwards=false
• 关键词: Collaborative; Research; Hyperspherical; Hidden; Crossing

The proposed project is an application of the hyperspherical hidden crossing method(HHCM) to positron-atom scattering. Positron-alkali collisions will be investigated inthe energy range where there are two open channels, elastic scattering and positroniumformation. For positron-hydrogen collisions, the plan is to extend previous two-channelcalculations to include excitation to the n=2 states of hydrogen. The objective of thisinvestigation is to provide insight into the dynamics of three charged particles which isbasic to the understanding of the dynamics of atomic collisions.The HHCM is well suited for the study of collisions involving three charged particles ofarbitrary mass. An important feature that the HHCM method shares with the hypersphericalmethod is that it treats excitation and the rearrangement process on equal footing.This is important for positronium formation in positron-atom collisions.

本课题是将超球面隐交叉方法应用于正电子-原子散射。在有弹性散射和正电子信息形成两个开放通道的能量范围内，将研究正电子-碱碰撞。对于正电子-氢碰撞，计划是扩展先前的双通道计算，以包括氢的n=2态的激发。本研究的目的是提供对三个带电粒子动力学的洞察，这是理解原子碰撞动力学的基础。HHCM非常适合研究涉及任意质量的三个带电粒子的碰撞。HHCM方法与超球方法共有的一个重要特征是它平等地对待激励和重排过程。这对于正电子-原子碰撞中正电子的形成是很重要的。