Triply differential single ionization of Ar by 200 eV positron and electron impact is measured and calculated. For an unequivocal test of kinematic differences, fully differential ejected electron angular distributions are measured using the same experimental apparatus and conditions for both positron and electron impact. The binary/recoil intensity ratios are shown to significantly differ for the two projectiles. These data are used to test theoretical calculations.
S. Otranto et al., "Triply Differential Single Ionization of Argon: Charge Effects for Positron and Electron Impact," Physical Review Letters, American Physical Society (APS), Apr 2010.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.104.163201
National Agency for the Promotion of Science and Technology (Argentina)
National Council of Scientific and Technical Investigations (Argentina)
National Science Foundation (U.S.)
Keywords and Phrases
Angular Distribution; Charge Effect; Impact Ionization; Particle Detectors; Argon; Positrons
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