Optical potential approach for positron scattering by metastable 23 S state of helium
Wu Xi-Gang1, Cheng Yong-Jun2, †, Liu Fang3, Zhou Ya-Jun2
       

Total cross sections for positron and electron scattering from metastable helium ( ). Solid line: present results for positron; dashed line: previous CCO results for electron; dotted line: positron CCC; dotted line: electron CCC; diamond: Neynaber et al. [26]; blacksquare: Wilson and Williams [25]; bullet: Uhlmann et al [4].