The Scattering of Fast Positrons and Electrons in Gold (for the Range 0.39-1.1 Mev.)

Abstract

The Wilson cloud chamber has been employed with the method of projected angles in a study of the scattering of positrons and electrons in thin gold foil, for the energy range 0.39-1.1 Mev. The small angle scattering is in reasonable agreement with current multiple scattering theory. Further, the investigation of the large angle scattering gives indications in favour of a spin orbital interaction, and the absolute intensity of the scattering for positrons and electrons under these conditions is believed to be approximately correct.

The Scattering of 1 MeV Electrons and Positrons

“…More recently,' accurate measurements using accelerated beams of electrons have shown good agreement with theory ( Van de Graaff, Buechner, and Feshbach 1946;Buechner et al 1947), but at the time when the present work was commenced, no satisfactory measurements of the electron-positron ratio had been made, although cloud-chamber measurements by Fowler and Oppenheimer (1938) and Lasich (1948) had suggested that the ratio was of the order predicted by theory. Since then Lipkin (1952) has made accurate measurements of .…”