Resonances and Bound States in Positron Annihilation on Molecules

摘要：

In spite of the fact that positrons are important in many areas, such as materials science and medicine, several types of fundamental positron-matter interactions are poorly understood. For example, positron annihilation in broad classes of molecules has been a puzzle for more than four decades 1, 2. The observed annihilation rates, Zeff (i.e., normalized by the Dirac rate, assuming all Z molecular electrons are free), are orders of magnitude greater than that expected from simple collisions, namely Zeff >> Z. In the past few years, studies using tunable, trap-based positron beams have provided key insights into the underlying physics of this process 2, 3.

作者: C.M.Surko

作者单位: Department of Physics,University of California,San Diego,La Jolla CA 92067 USA

会议类型: 国际会议

会议名称: 第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)

会议地点: 武汉

会议语种:英文

页码: 3

在线出版日期: 2008-05-11（万方平台首次上网日期，不代表论文的发表时间）