Abstract
The resonant differential scattering of electrons by helium has been investigated for energies close to 193 ev. A data-logging technique was used to obtain exceptionally high signal-to-noise ratios. Analysis of the results gave δ0 similar,equals 111°, δ1 similar,equals 17° and δ2 similar,equals 3° for the first three phase shifts for potential scattering at the resonance energy, and 8 mev for the natural width at half-height. Structure was observed at 1945 ± 005 ev which had the properties of a p-wave resonance with a natural width of order 025 mev.
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