已收录 273075 条政策
 政策提纲
  • 暂无提纲
Positronium and Electron Scattering on Helium
[摘要] A recent work [1] establishes experimentally that Positronium scattering by atoms of various elements is surprisingly close in total cross-section to that of an isolated electron of the same velocity. In this work we will look at the scattering of Ps on Helium and compare it to a determination of the scattering of an e- with the same element. For both the Ps scattering and the e- scattering on He, we assume the symmetrization of the e- with the closed shell He electrons is the dominant interaction. A local effective potential employed in [2] and [3] is used to model the electron exchange and cross- sections are determined for a set of partial waves. For the Ps scattering we include as a secondary effect the Van der Waals interaction. For single e- scattering of He, we also employ a short range Coulomb potential and dispersion as contributing effects. Results of the cross-sections determined in each case are then compared
[发布日期] 2011-01-01 [发布机构] 
[效力级别]  [学科分类] 物理(综合)
[关键词]  [时效性] 
   浏览次数:4      统一登录查看全文      激活码登录查看全文