Resonances for positron–helium and positron–lithium systems in kappa-distribution plasma

• 来源期刊: 中国物理B（英文版）
• 关键词: positron–atom scattering kappa-distribution plasmas model potential approach variational method
• 年，卷（期）: 2018,（12）
• 页码范围: 279-285
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/12/123402

摘要

S-wave resonances of positron–helium and positron–lithium systems in kappa-distribution plasmas are investigated using Hylleraas-type wave functions in the framework of the stabilization method. A model potential approach is used to represent the interactions between the outer electron, the positron and the core. The resonance parameters (position and width) of positron–helium and positron–lithium systems below the Ps(2s) threshold are reported as a function of screening parameter and spectral index of plasma.