Resonances for positron–helium and positron–lithium systems in kappa-distribution plasma** Project supported by the University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province, China (Grant No. UNPYSCT- 2015019), the Fundamental Research Funds of Heilongjiang University, Heilongjiang Province, China (Grant No. HDJCCX-201625), the Natural Science Foundation for Distinguished Young Scholars in Heilongjiang University, China (Grant No. JCL201503), and the

Abstract

S-wave resonances of positro–helium and positro–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 positro–helium and positro–lithium systems below the Ps(2s) threshold are reported as a function of screening parameter and spectral index of plasma.