Compton double-to-single ionization ratio of helium at 57 keV

Journal Article · Wed May 01 04:00:00 EDT 1996 · Bulletin of the American Physical Society

OSTI ID:394294

Berrah, N; Wehlitz, R; Levin, J C; Selin, I A ^[1]

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1. Univ. of Tennessee, Knoxville, TN (United States); and others

The authors have measured the Compton double-to-single ionization ratio of helium using an ion time-of-flight spectrometer along with monochromatized synchrotron radiation of 57 keV. This photon energy is higher than in all former published experiments and probes the Compton ionization alone since the photoionization gives only a negligible contribution to the total cross section. Comparing their results, which is (1.25 {plus_minus} 0.3)%, with theoretical calculations and measurements at lower energies shows that this energy is most likely still not high enough to confirm the value of the asymptotic high-energy limit experimentally. A similar results was obtained in a recent experiment using a different method.

• DOE Contract Number: FG02-92ER14299
• OSTI ID: 394294
• Report Number(s): CONF-9605105--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 41; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COMPTON EFFECT
HELIUM
IONIZATION
KEV RANGE 10-100
SYNCHROTRON RADIATION