With the crossed beam apparatus the relative impact-ionization cross section of atomic hydrogen by positron impact was measured. A layout of the scattering region is given. The first measurements on the ionization of atomic hydrogen by positron impact are also given.
Document ID: 19900009661. Accession ID: 90N18977. NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies; p 125-127.