LXXI. The multiple scattering of positrons and electrons by nitrogen and argon

Summary A combination of lens spectrometer and cloud chamber was used to measure and compare the multiple scattering of positrons and electrons at energies in the neighbourhood of 0 ·4 mev. The ratio of observed to theoretical mean absolute scattering angle was 0·99 for N2 and 0·92 for A, with a standard error of 3%. Comparable results by other workers are discussed. In contrast with the conclusions of other workers, no significant difference in the behaviour of positrons and electrons could be detected.