title: Measurement of Cu K-shell and Ag L-shell ionization cross sections by low-energy positron impact.
abstract: Inner shell ionization cross sections by low-energy positron impact have been measured. Development of an x-ray detector with thin Si(Li) crystals has enabled the first measurements of the absolute cross sections for the positron impacts in the energy range below 30 keV. Threshold behavior of the measured cross sections for the Cu K shell and Ag L shell are compared with the theoretical results of Gryzinski and Kowalski [Phys. Lett. A 183, 196 (1993)]] and Khare and Wadehra [Can. J. Phys. 74, 376 (1996)]]. Good agreement has been found for the Cu K shell, while the experimental values for the Ag L shell were found to be smaller than the corresponding theoretical results.
authors.affiliation: Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan. ynaga@rs.kagu.tus.ac.jp
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Nagashima
authors.forename: Fuminori
authors.initials: F
authors.lastname: Saito
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Itoh
authors.forename: Akira
authors.initials: A
authors.lastname: Goto
authors.forename: Toshio
authors.initials: T
authors.lastname: Hyodo