Compton Double Ionization of Helium in the Region of the Cross-Section Maximum

B. Krässig; R. W. Dunford; D. S. Gemmell; S. Hasegawa; E. P. Kanter; H. Schmidt-Böcking; W. Schmitt; S. H. Southworth; Th. Weber; L. Young

doi:10.1103/PhysRevLett.83.53

Compton Double Ionization of Helium in the Region of the Cross-Section Maximum

B. Krässig, R. W. Dunford, D. S. Gemmell, S. Hasegawa, E. P. Kanter, H. Schmidt-Böcking, W. Schmitt, S. H. Southworth, Th. Weber, and L. Young

Phys. Rev. Lett. 83, 53 – Published 5 July 1999

Abstract

The ratio of double-to-single ionization in helium by Compton scattering has been measured in the 8–28 keV x-ray energy range. The ratio attains a maximum value of $1.6 %$ near 13 keV before descending towards the high-energy asymptotic region. The reported results resolve the discrepancies among previously published theoretical and experimental work in this energy range. The present data are most closely approximated by the results of the many-body perturbation theory calculation of Bergstrom et al. [Phys. Rev. A 51, 3044 (1995)].

Received 22 March 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.53

Authors & Affiliations

B. Krässig^1,*, R. W. Dunford¹, D. S. Gemmell¹, S. Hasegawa^1,†, E. P. Kanter¹, H. Schmidt-Böcking², W. Schmitt^3,1, S. H. Southworth¹, Th. Weber^2,1, and L. Young¹

¹Argonne National Laboratory, Argonne, Illinois 60439
²Institut für Kernphysik, Universität Frankfurt, August-Euler-Straße 6, D-60486 Frankfurt, Germany
³Fakultät für Physik, Universität Freiburg, D-79104 Freiburg, Germany

^*Corresponding author. Email address: kraessig@anl.gov
^†Present address: Department of Quantum Engineering and System Science, University of Tokyo, Tokyo, Japan