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Phys. Rev. Lett. 83, 53–56 (1999)

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

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B. Krässig1,*, R. W. Dunford1, D. S. Gemmell1, S. Hasegawa1,†, E. P. Kanter1, H. Schmidt-Böcking2, W. Schmitt3,1, S. H. Southworth1, Th. Weber2,1, 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

Received 22 March 1999; published in the issue dated 5 July 1999

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)].

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.53
DOI:
10.1103/PhysRevLett.83.53
PACS:
32.80.Cy

*Corresponding author. Email address: kraessig@anl.gov

†Present address: Department of Quantum Engineering and System Science, University of Tokyo, Tokyo, Japan

 
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